R
mPGA604 Socket
Design Guidelines
Revision 1.0
October 2003
Document Number: 254239-001
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Contents
1
Introduction ....................................................................................................................... 9
1.1
1.2
1.3
Objective ................................................................................................................ 9
Purpose.................................................................................................................. 9
Scope..................................................................................................................... 9
2
3
Assembled Component and Package Description...................................................... 11
2.1
2.2
Assembled Component Description..................................................................... 11
Package Description ............................................................................................ 11
Mechanical Requirements.............................................................................................. 13
3.1
3.2
Mechanical Supports ........................................................................................... 13
Materials............................................................................................................... 13
3.2.1 Socket Housing....................................................................................... 13
3.2.2 Color........................................................................................................ 13
Cutouts for Package Removal ............................................................................. 13
Socket Standoff Height ........................................................................................ 13
Markings............................................................................................................... 14
3.5.1 Name....................................................................................................... 14
3.5.2 Lock (Closed) and Unlock (Open) Markings........................................... 14
3.5.3 Lot Traceability........................................................................................ 14
Socket Size .......................................................................................................... 15
Socket/Package Translation During Actuation .................................................... 15
Orientation in Packaging, Shipping and Handling ............................................... 15
Contact Characteristics........................................................................................ 15
3.9.1 Number of Contacts................................................................................ 15
3.9.2 Base Material.......................................................................................... 15
3.9.3 Contact Area Plating............................................................................... 15
3.9.4 Solder Ball Attachment Area Plating....................................................... 15
3.9.5 Solder Ball Characteristics...................................................................... 15
3.9.6 Lubricants................................................................................................ 16
Material and Recycling Requirements................................................................. 16
Lever Actuation Requirements............................................................................. 16
Socket Engagement/Disengagement Force........................................................ 16
Visual Aids ........................................................................................................... 16
Socket BGA Co-Planarity..................................................................................... 16
Solder Ball True Position ..................................................................................... 16
Critical-to-Function Dimensions........................................................................... 17
3.3
3.4
3.5
3.6
3.7
3.8
3.9
3.10
3.11
3.12
3.13
3.14
3.15
3.16
4
Electrical Requirements................................................................................................. 19
4.1
4.2
4.3
Electrical Resistance............................................................................................ 20
Determination of Maximum Electrical Resistance ............................................... 24
Inductance............................................................................................................ 24
4.3.1 Design Procedure for Inductance Measurements .................................. 25
4.3.2 Correlation of Measurement and Model Data Inductance...................... 26
Pin-to-Pin Capacitance ........................................................................................ 27
Dielectric Withstand Voltage................................................................................ 27
Insulation Resistance........................................................................................... 27
Contact Current Rating ........................................................................................ 27
4.4
4.5
4.6
4.7
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5
Environmental Requirements........................................................................................ 29
5.1
Porosity Test ........................................................................................................ 30
5.1.1 Porosity Test Method.............................................................................. 30
5.1.2 Porosity Test Criteria .............................................................................. 30
Plating Thickness................................................................................................. 30
Solvent Resistance .............................................................................................. 30
Solderability.......................................................................................................... 30
Durability .............................................................................................................. 31
5.2
5.3
5.4
5.5
6
Validation Testing Requirements.................................................................................. 33
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
Applicable Documents ......................................................................................... 33
Testing Facility..................................................................................................... 33
Funding ................................................................................................................ 33
Socket Design Verification................................................................................... 33
Reporting.............................................................................................................. 33
Process Changes................................................................................................. 33
Quality Assurance Requirements ........................................................................ 34
Socket Test Plan.................................................................................................. 34
6.8.1 Submission of an mPGA604 Socket for Validation Testing.................... 34
Mechanical Samples............................................................................................ 34
Socket Validation Notification .............................................................................. 34
Production Lot Definition...................................................................................... 34
Socket Validation ................................................................................................. 34
6.9
6.10
6.11
6.12
7
8
A
Safety Requirements ...................................................................................................... 35
Documentation Requirements....................................................................................... 37
Appendix A ...................................................................................................................... 39
Figures
Figure 4-1. Methodology for Measuring Total Electrical Resistance ................................ 20
Figure 4-2. Methodology for Measuring Electrical Resistance of the Jumper .................. 20
Figure 4-3. Electrical Resistance Fixtures Superimposed................................................ 21
Figure 4-4. Inductance Measurement Fixture Cross-Section ........................................... 25
Figure 4-5. Inductance and Capacitance Fixture.............................................................. 25
Figure 5-1. Flowchart of Knowledge-Based Reliability Evaluation Methodology ............. 29
Figure A-1. 42.5 mm, 604-Pin Package Assembly Drawing (Sheet 1 of 3)...................... 39
Figure A-2. 42.5 mm, 604-Pin Package Assembly Drawing (Sheet 2 of 3)...................... 40
Figure A-3. 42.5 mm, 604-Pin Package Assembly Drawing (Sheet 3 of 3)...................... 41
Figure A-4. mPGA604 Socket Drawing (Sheet 1 of 3) ..................................................... 42
Figure A-5. mPGA604 Socket Drawing (Sheet 2 of 3) ..................................................... 43
Figure A-6. mPGA604 Socket Drawing (Sheet 3 of 3) ..................................................... 44
Figure A-7. 603-Pin Interposer Assembly Drawing (Sheet 1 of 7).................................... 45
Figure A-8. 603-Pin Interposer Assembly Drawing (Sheet 2 of 7).................................... 46
Figure A-9. 603-Pin Interposer Assembly Drawing (Sheet 3 of 7).................................... 47
Figure A-10. 603-Pin Interposer Assembly Drawing (Sheet 4 of 7).................................. 48
Figure A-11. 603-Pin Interposer Assembly Drawing (Sheet 5 of 7).................................. 49
Figure A-12. 603-Pin Interposer Assembly Drawing (Sheet 6 of 7).................................. 50
Figure A-13. 603-Pin Interposer Assembly Drawing (Sheet 7 of 7).................................. 51
4
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Tables
2-1
3-1
4-1
4-2
4-3
4-4
5-1
Package Critical-To-Function (CTF) Dimensions ................................................ 11
Socket Critical-to-Function Dimensions............................................................... 17
Electrical Requirements for Sockets.................................................................... 19
Definitions ............................................................................................................ 19
Resistance Test Fixtures Netlist .......................................................................... 22
Netlist for FSETV4 Rev 1 Edge Fingers .............................................................. 27
Use Conditions Environment ............................................................................... 29
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Revision History
Revision
Number
Description
• Initial release of the document.
Date
1.0
October 2003
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Re-Validation Notice to Socket Vendors
Any significant change to the socket will require submission of a detailed explanation of the change
at least 60 days prior to the planned implementation. Intel will review the modification and
establish the necessary re-validation procedure that the socket must pass. Any testing that is
required MUST be completed before the change is implemented.
Typical examples of significant changes include, but are not limited to, the following: plastic
material changes including base material or color; contact changes including base material, plating
material or thickness; and design modifications.
For details on validation testing requirements, see Section 6.
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1 Introduction
1.1
Objective
This document defines a surface mount, Zero Insertion Force (ZIF) socket intended for workstation
and server platforms based on future Intel microprocessors. The socket provides I/O, power and
ground contacts. The socket contains 604 contacts arrayed about a cavity in the center of the socket
with solder balls/surface mount features for surface mounting with the motherboard. The mPGA604
socket contacts have 50mil pitch with regular pin array, to mate with a 604-pin processor package.
A 604-pin package will be mated with a 603 solder ball socket. The dummy pin is a key that allows
either the 603-pin processor package or the 604-pin processor package to be used in the same
socket.
1.2
1.3
Purpose
To define functional, quality, reliability, and material (that is, visual, dimensional and physical)
requirements and design guidelines of the mPGA604 socket in order to provide low cost, low risk,
robust, high volume manufacturable (HVM) socket solution available from multiple sources.
Scope
This design guideline applies to all 604-pin ZIF sockets purchased to the requirements of this design
guideline.
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Introduction
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2 Assembled Component and
Package Description
Information provided in this section is to ensure dimensional compatibility of the mPGA604 socket
with that of the 604-pin processor package. The processor package must be inserted into the
mPGA604 socket with zero insertion force when the socket is not actuated.
2.1
2.2
Assembled Component Description
The assembled component may consist of a heatsink, EMI shield, clips, fan, retention mechanism
(RM), and processor package. Specific details can be obtained from Thermal Design Guidelines,
consult your Intel field representative to obtain this document.
Package Description
The outline of the processor package that can be used with the mPGA604 socket is illustrated in
Figure A-1. This drawing does not include potential heatsinks since these are used at the OEM's
discretion.
The pin-out for the 604-pin processor package is shown in Figure A-2.
The pin dimension details, base material, plating material and plating thickness are shown in
Figure A-3. Note the dimensional variation when designing to ensure ZIF. The package Critical-To-
Function (CTF) dimensions are presented in Table 2-1. CTF values are detailed on the processor
package drawings and take precedence over all values presented in this document.
Table 2-1. Package Critical-To-Function (CTF) Dimensions
Dimension
Shoulder Diameter (Land Solder Fillet Shoulder Inclusion)
Pin Diameter
Shoulder Diameter Protrusion (Land Solder Fillet Shoulder
Inclusion)
Pin Length (Effective)*
Pin True Position (Pattern Relating and Feature Relating)*
Flatness of Processor*
Note: Pin length, pin true position and flatness tolerances are controlled by Geometric Dimensioning and
Tolerancing (GD&T) controls.
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Assembled Component and Package Description
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3 Mechanical Requirements
3.1
Mechanical Supports
A retention system needs to isolate any load in excess of 50 lbf, compressive, from the socket during
the shock and vibration conditions outlined in Sections 5. The socket must pass the mechanical
shock and vibration requirements listed in Sections 5 with the associated heatsink and retention
mechanism attached. socket can only be attached by the 603 contacts to the motherboard. No
external (i.e. screw, extra solder, adhesive, etc.) methods to attach the socket are acceptable.
3.2
Materials
3.2.1
Socket Housing
Thermoplastic or equivalent, UL 94V-0 flame rating, temperature rating and design capable of
withstanding a temperature of 240°C for 40sec (minimum) typical of a reflow profile for solder
material used on the socket. The material must have a thermal coefficient of expansion in the XY
plane capable of passing reliability tests rated for an expected high operating temperature, mounted
on FR4-type motherboard material.
3.2.2
Color
The color of the socket can be optimized to provide the contrast needed for OEM’s pick and place
vision systems. The base and cover of the socket may be different colors as long as they meet the
above requirement.
3.3
3.4
Cutouts for Package Removal
Recessed cutouts are required in the side of the socket to provide better access to the package
substrate, and facilitate the manual removal of inserted package. Figure A-6.
Socket Standoff Height
Socket stand off height, cover lead in and cover lead in depth must not interfere with package pin
shoulder at worst-case conditions. The processor (not the pin shoulder) must sit flush on the socket
standoffs and the pin field cannot contact the standoffs. Figure A-5.
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Mechanical Requirements
Proper seating
3.5
Markings
All markings required in this section must be able to withstand a temperature of 240°C for 40
seconds (minimum) typical of a reflow profile for solder material used on the socket, as well as any
environmental test procedure outlined in Section 5.
3.5.1
Name
mPGA604 (font type is Helvetica Bold – minimum 6 point).
This mark shall be molded or Laser Marked into the processor side of the socket housing.
Manufacturer’s insignia (font size at supplier’s discretion).
This mark will be molded or laser marked into the socket housing. Both marks must be visible when
first seated in the motherboard. Any request for variation from this marking requires a written
description (detailing size and location) to be provided to Intel for approval.
3.5.2
Lock (Closed) and Unlock (Open) Markings
The universal symbols for ‘Lock’ and ‘Unlock’ are to be marked on the socket in the appropriate
positions. Clear indicator marks must be located on the actuation mechanism that identifies the lock
(closed) and unlock (open) positions of the cover as well as the actuation direction. These marks
should still be visible after a package is inserted into the socket.
Lock (closed)
Unlock (open)
3.5.3
Lot Traceability
Each socket will be marked with a lot identification code that will allow traceability of all
components, date of manufacture (year and week), and assembly location. The mark must be placed
on a surface that is visible when mounted on a printed circuit board. In addition, this identification
code must be marked on the exterior of the box in which the units ship.
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Mechanical Requirements
3.6
3.7
3.8
Socket Size
The socket size must meet the dimensions as shown in Figure A-5 and Figure A-6, allowing full
insertion of the pins in the socket, without interference between the socket and the pin field. The
mPGA604 socket and actuation area must fit within the keep-in zone defined in Figure A-6.
Socket/Package Translation During Actuation
The socket shall be built so that the post-actuated package pin field displacement will not exceed
1.27 mm. Movement will be along the Y direction (refer to axes as indicated in Figure A-5. No Z-
axis travel (lift out) of the package is allowed during actuation.
Orientation in Packaging, Shipping and Handling
Packaging media needs to support high volume manufacturing.
3.9
Contact Characteristics
3.9.1
Number of Contacts
Total number of contacts: 603.
Total number of contact holes: 604.
3.9.2
3.9.3
Base Material
High strength copper alloy.
Contact Area Plating
0.762 µm (min) gold plating over 1.27 µm (min) nickel underplate in critical contact areas (area on
socket contacts where processor pins will mate) is required. No contamination by solder in the
contact area is allowed during solder reflow.
3.9.4
3.9.5
Solder Ball Attachment Area Plating
3.81 µm (min) Tin/Lead (typically 85±5Sn/15Pb).
Solder Ball Characteristics
Tin/Lead (63/37 ± 0.5% Sn).
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Mechanical Requirements
3.9.6
Lubricants
For the final assembled product, no lubricant is permitted on the socket contacts. If lubricants are
used elsewhere within the socket assembly, these lubricants must not be able to migrate to the
socket contacts.
3.10
Material and Recycling Requirements
Cadmium shall not be used in the painting or plating of the socket.
CFCs and HFCs shall not be used in manufacturing the socket. It is recommended that any plastic
component exceeding 25g must be recyclable as per the European Blue Angel recycling design
guidelines.
3.11
3.12
Lever Actuation Requirements
•
•
•
•
Lever closed direction – right.
Actuation direction called out in Figure A-5.
135° lever travel max.
Pivot point in the center of the actuation area on the top of the socket. Figure A-6.
Socket Engagement/Disengagement Force
The force on the actuation lever arm must not exceed 44N to engage or disengage the package into
the mPGA604 socket. Movement of the cover is limited to the plane parallel to the motherboard.
The processor package must not be utilized in the actuation of the socket. Any actuation must meet
or exceed SEMI S8-95 Safety Guidelines for Ergonomics/Human Factors Engineering of
Semiconductor Manufacturing Equipment, example Table R2-7 (Maximum Grip Forces).
3.13
3.14
3.15
Visual Aids
The socket top will have markings identifying Pin 1. This marking will be represented by a clearly
visible triangular symbol. See Figure A-6.
Socket BGA Co-Planarity
The co-planarity (profile) requirement for all solder balls on the underside of the socket is located in
Figure A-5.
Solder Ball True Position
The solder ball pattern has a true position requirement with respect to Datum A, B, and C (see
Figure A-5).
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Mechanical Requirements
3.16
Critical-to-Function Dimensions
The mPGA604 socket shall accept a 604-pin processor pin field. All dimensions are metric.
Asymmetric features are designed to properly align the socket to the motherboard and prevent the
socket from being assembled incorrectly to the motherboard.
Critical-to-function (CTF) dimensions are identified in Table 3-1. The CTF values are detailed on
the mPGA604 socket drawing in Figure A-5 and Figure A-6 and take precedence over all values
presented in this document. Dimensional requirements identified in the drawings and in Table 3-1
must be met. These dimensions will be verified as part of the validation process. Also, supplier will
provide and maintain Critical Process Parameters controlling these CTFs or will provide direct
measurements to meet ongoing quality requirements.
Table 3-1. Socket Critical-to-Function Dimensions
Dimension
Socket Length
Socket Width
Socket Height (Interposer surface from MB)
Assembled Seating Plane Flatness
Ball Diameter
True Position of Balls (pattern relating)
Co-planarity (profile) of Balls
Actuation Distance (Cover Travel)
Through Cavity X
Through Cavity Y
Cover Hole Diameter (Must guarantee ZIF)
Cover Hole Countersink Depth (Must guarantee ZIF)
Cover Hole Countersink Diameter (Must guarantee ZIF)
Cover Hole Virtual Condition (Pattern Locating)
Cover Hole Virtual Condition (Feature Relating)
Cover Hole Field Depth wrt Seating Plane
Cover Thickness in Hole area
Au Thickness
Ni Thickness
Alignment Post Virtual Condition
Contact Depth from Seating Plane
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4 Electrical Requirements
Socket electrical requirements are measured from the socket-seating plane of the processor test
vehicle (PTV) to the component side of the socket PCB to which it is attached. All specifications are
maximum values (unless otherwise stated) for a single socket pin, but includes effects of adjacent
pins where indicated. Pin and socket inductance includes exposed pin from mated contact to bottom
of the processor pin field.
Table 4-1. Electrical Requirements for Sockets
1
2
3
4
Mat11 loop inductance, Lloop
<4.33nH
NA
Refer to Table 4-2, Item 1
Refer to Table 4-2, Item 2a
Refer to Table 4-2, Item 3
Mated partial mutual inductance, L
Maximum mutual capacitance, C
Maximum Ave Contact Resistance
<1pF
≤ 17mΩ
Refer to Table 4-2, Item 4
Refer to Section 4.1 for more detail.
Refer to mPGA603 Socket Design
Guidelines for electrical parameters
with INT3 packages.
5
6
Measurement frequency(s) for Pin-to-
Pin/Connector-to-Connector capacitance.
400 MHz
1 GHz
Measurement frequency(s) for Pin-to-
Pin/Connector-to-Connector inductance.
7
8
9
Dielectric Withstand Voltage
Insulation Resistance
360 Volts RMS
800 M Ohms
Contact Current Rating
Read and record
Table 4-2. Definitions
1
Mated loop inductance, Lloop
Refer to Table 4-1, Item 11
The inductance calculated for two conductors, considering
one forward conductor and one return conductor.
2a
3
Mated mutual inductance, L
Refer to Table 4-1, Item 2
The inductance on a conductor due to any single
neighboring conductor.
Maximum mutual capacitance, C
Refer to Table 4-1, Item 3
The capacitance between two pins/connectors.
4
Maximum Average Contact Resistance
Refer to Table 4-1, Item 4
The max average resistance target is originally derived from
max resistance of each chain minus resistance of shorting
bars divided by number of pins in the daisy chain.
This value has to be satisfied at all time. Thus, this is the
spec valid at End of Line, End of Life and etc.
Socket Contact Resistance: The resistance of the socket
contact, interface resistance to the pin, and the entire pin to
the point where the pin enters the interposer; gaps included.
5
6
Measurement frequency(s) for Capacitance
Measurement frequency(s) for Inductance
Capacitively dominate region. This is usually the lowest
measurable frequency. This should be determined from the
measurements done for the feasibility.
Linear region. This is usually found at higher frequency
ranges. This should be determined from the measurements
done for the feasibility.
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Electrical Requirements
4.1
Electrical Resistance
Figure 4-1 and Figure 4-2 show the proposed methodology for measuring the final electrical
resistance. The methodology requires measuring interposer flush-mounted directly to the
motherboard fixtures, so that the pin shoulder is flush with the motherboard, to get the averaged
jumper resistance, Rjumper. The Rjumper should come from a good statistical average of 30
package fixtures flush mounted to a motherboard fixture. The same measurements are then made
with a package fixture mounted on a supplier’s socket, and both are mounted on a motherboard
fixture; this provides the RTotal. The resistance requirement, RReq, can be calculated for each chain as
will be explained later.
Figure 4-1. Methodology for Measuring Total Electrical Resistance
Socket Contact
Interposer
Shorting Bar
Interposer Shoulder
Interposer Pin
-V
+V
+I
-I
Motherboard
Figure 4-2. Methodology for Measuring Electrical Resistance of the Jumper
Interposer
Shorting Bar
Interposer Shoulder
+V
+I
-V
-I
Motherboard
Figure 4-3 shows the resistance test fixtures separately and superimposed. The upper figure is the
package. The next figure is the baseboard. There are 48 daisy chain configurations on resistance test
board. The bottom figure is the two parts superimposed. Table 4-3 shows these configurations with
the number of pins per each chain and netlist.
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Electrical Requirements
Figure 4-3. Electrical Resistance Fixtures Superimposed
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Electrical Requirements
Table 4-3. Resistance Test Fixtures Netlist
DC Endpoints
Edgefingers: Hi
Edgefingers: Low
Daisy
Chain
# of pins per
chain
Hi
Low
+I
+V
-V
-I
1
2
14
14
16
14
14
14
12
14
12
12
10
10
10
12
10
AE2
AE29
AD1
AD30
AC3
AC30
AB4
AB29
AA5
AA28
Y6
AE16
AE16
AD16
AD16
AC16
AC16
AB16
AB16
AA16
AA16
Y16
A94
A136
A92
A93
A135
A91
A118
A118
A116
A116
A114
A114
A112
A112
A110
A110
A108
A108
A46
A117
A117
A117
A117
A113
A113
A111
A111
A109
A109
A107
A107
A45
3
4
A138
A96
A137
A95
5
6
A142
A98
A141
A97
7
8
A134
A100
A132
A102
A130
A90
A133
A99
9
10
11
12
13
14
15
A131
A101
A129
A89
Y25
Y16
AC1
B1
N1
N1
A64
A63
A46
A45
AC2
N2
A88
A87
A48
A47
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Electrical Requirements
Table 4-3. Resistance Test Fixtures Netlist (Continued)
DC Endpoints
Edgefingers: Hi
Edgefingers: Low
Daisy
Chain
# of pins per
chain
Hi
Low
+I
+V
-V
-I
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
12
10
10
8
B2
AB3
C3
N2
N3
A66
A86
A68
A84
A70
A72
A74
A76
A78
A82
A62
A18
A60
A14
A58
A20
A56
A22
A72
A24
A80
A128
A26
A2
A67
A85
A67
A83
A69
A71
A73
A75
A77
A81
A61
A17
A59
A13
A57
A19
A55
A21
A71
A23
A79
A127
A25
A1
A48
A50
A50
A52
A52
A120
A104
A104
A106
A106
A42
A42
A40
A40
A38
A38
A36
A36
A44
A44
A28
A28
A126
A126
A124
A124
A122
A34
A34
A32
A32
A30
A30
A47
A49
A49
A51
A51
A119
A103
A103
A105
A105
A41
A41
A39
A39
A37
A37
A35
A35
A43
A43
A27
A27
A125
A125
A123
A123
A121
A33
A33
A31
A31
A29
A29
N3
AA4
D4
N4
10
16
14
14
14
12
16
46
14
14
12
14
12
12
10
10
14
14
14
14
16
16
16
10
8
N4
E5
Y5
F6
W7
F7
W7
F8
W9
G9
W9
A1
A16
A16
B16
B16
C16
C16
D16
D16
E16
E16
F23
F23
W24
W24
Y26
Y26
Y28
N29
N29
N30
N30
N31
N31
A30
B3
B30
C4
C29
D5
D28
E5
E25
F9
W23
F24
F25
E26
E27
E28
D29
AA29
C30
AB30
A31
AD31
A4
A3
A6
A5
A8
A7
A10
A146
A12
A144
A16
A140
A9
A145
A11
A143
A15
A139
10
10
12
12
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Electrical Requirements
4.2
Determination of Maximum Electrical Resistance
This section provides a guideline for the instruments used to take the measurements.
Note: The instrument selection should consider the guidelines in EIA 364-23A.
1. These measurements use a 4-wire technique, where the instruments provide two separate
circuits. One is a precision current source to deliver the test current. The other is a precision
voltmeter circuit to measure the voltage drop between the desired points.
2. These separate circuits can be contained within one instrument, such as a high quality micro-
ohmmeter, a stand-alone current source and voltmeter, or the circuits of a data acquisition
system.
3. Measurement accuracy in Ω is specified as ± 0.1% of reading, or ± 0.1 m Ω, whichever is
greater. The vendor is responsible for demonstrating that their instrument(s) can meet this
accuracy.
4. Automation of the measurements can be implemented by scanning the chains through the
edge or cable test connector using a switch matrix. The matrix can be operated by hand, or
through software.
5. Measure RTotal for each daisy chain of “package + socket + motherboard” unit.
6. Measure Rjumper for each daisy chain of 30 “package + motherboard” units. Calculate
R
jumper for each daisy chain (There is 30 data for each daisy chain).
7. For each socket unit, calculate
RTotal − R jumper
RReq
=
N
RReq is the average contact resistance for socket pin.
4.3 Inductance
The bottom fixture for the inductance measurement is a ground plane on the secondary side of the
motherboard with all pins grounded. The component side of the socket PCB does not contain a
plane. The top fixture is the package, which contains pins that will connect to the socket. Figure 4-4
shows the inductance measurement fixture cross-section and the inductance measurement
methodology. The first figure shows the entire assembly. The second figure shows the assembly
without the socket; the socket-seating plane of the package is directly mounted to the component
side of the socket PCB. This is used to calibrate out the fixture contribution. The materials for the
fixture must match the materials used in the processor. Note the probe pad features exist on the
topside of the top fixture, and the shorting plane exists only on the bottom side of the bottom fixture.
Figure 4-5 presents the inductance and capacitance fixture design.
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Electrical Requirements
Figure 4-4. Inductance Measurement Fixture Cross-Section
Probing Pads Surface
Interposer
40 mils
No Features or Plane
on this Layer
Socket
Interposer Pin
No Plane on this Layer
Full Plane on this Layer
Motherboard
Short all L pins (using a solid plane)
No Features or
Plane on this Layer
Interposer
Interposer Shoulder
Short all L pins (using a solid plane)
Motherboard
Figure 4-5. Inductance and Capacitance Fixture
A
B
1
4
5
AC
AD
2
8
6
3
7
2
1
29
30
4.3.1 Design Procedure for Inductance Measurements
The measurement equipment required to perform the validation is:
1. Equipment - HP8753D Vector Network Analyzer or equivalent.
2. Robust Probe Station (GTL4040) or equivalent.
3. Probes - GS1250 & GSG1250 Air-Co-Planar or equivalent.
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Electrical Requirements
4. Calibration – Cascade Calibration Substrates or equivalent.
5. Measurement objects – packages, sockets, motherboards.
Measurement Steps:
•
Equipment Setup
Cables should be connected to the network analyzer and to the probes using the
appropriate torque wrench to ensure consistent data collection every time the
measurement is performed.
•
•
Set VNA
Bandwidth = 30 0KHz – 3 GHz with 801 points.
Averaging Factor = 16.
Perform Open/Short/Load calibration:
Calibration should be performed at the start of any measurement session.
Create Calibration Kit if necessary for 1st time.
Do not perform port extension after calibration.
•
•
Check to ensure calibration successfully performed.
Measure the inductance of configuration 4 of the package mounted on the socket, which is
mounted to the motherboard fixture (Figure 4-5):
Call this Lsocket assembly
.
Export data into MDS/ADS or (capture data at frequency specified in Item 6 of
Table 4-1).
•
Measure the inductance of configuration 4 of the package mounted on the socket, which is
mounted to the motherboard fixture (Figure 4-5). Call this Lsandwich
Measure 30 units.
:
The package for 30 units must be chosen from different lots. Use 5 different lots, 6 units
from each lot.
Export data into MDS/ADS or (capture data at frequency specified in Item 6 of
Table 4-1).
Calculate Lsandwich
.
For each socket unit, calculate
Lsocket = Lsocket assembly − Lsandwich
It means Lsandwich will be subtracted from each Lsocket assembly and the result will be
compared with spec value for each individual socket unit.
4.3.2
Correlation of Measurement and Model Data Inductance
To correlate the measurement and model data for loop inductance, one unit of measured socket
assembly (socket and shorted test fixture) and one unit of measured sandwich (shorted test fixture)
will be chosen for cross-sectioning. Both units will be modeled based on data from cross-sectioning
using Ansoft 3D*. The sandwich inductance will be subtracted from socket assembly inductance for
both measured and modeled data. This procedure results in loop inductance for socket pin +
interposer pin. This final result can be compared with the loop inductance from the supplier model
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for the socket. The shoulder of the interposer is not included in the electrical modeling. If there is
any difference between them, it will be called the de-embedded correction factor. Adding the
interposer to the socket and then eliminating the contribution of the fixture creates this correction
factor because inductance is not linear.
4.4 Pin-to-Pin Capacitance
Pin-to-pin capacitance shall be measured using configuration 4, with the motherboard not connected
and only the measurements with the package mounted on the socket will be taken. Capture data at
frequency specified in Item 5 of Table 4-1.
4.5 Dielectric Withstand Voltage
No disruptive discharge or leakage greater than 0.5 mA is allowed when subjected to 360 V RMS.
The sockets shall be tested according to EIA-364, Test Procedure 20A, Method 1. The sockets shall
be tested unmounted and unmated. Barometric pressure shall be equivalent to Sea Level. The
sample size is 25 contact to contact pairs on each of four sockets. The contacts shall be randomly
chosen.
4.6 Insulation Resistance
The insulation resistance shall be greater than 800 M Ohm when subjected to 500 V DC. The
sockets shall be tested according to EIA-364, Test Procedure 21. The sockets shall be tested
unmated and unmounted. The sample size is 25 contact to contact pairs on each of four sockets. The
contacts shall be randomly chosen.
4.7 Contact Current Rating
Measure and record the temperature rise when the socket is subjected to rated current of 0.8A. The
sockets shall be tested according to EIA-364, Test Procedure 70A, Test Method 1. The sockets shall
be mounted on a test-board and mated with a package so those 603 pins are connected in series. The
recommended Test-board is the FSETV4 Rev 1 and the recommended package is FSETV5 Rev 1.
The wiring list is shown below. Mount the thermocouple as near to contact N3 or N7 as possible.
Short the daisy chains by means of the edge fingers if possible. Sample size is one socket.
Table 4-4. Netlist for FSETV4 Rev 1 Edge Fingers
Edge Fingers
+I: A61
Jumpers
A85-A89
–I: A145
A45-A17
A129-A133
A15-A13
A131-A137
A11-A9
A135-A141
A7-A5
A59-A57
A87-A95
A49-A47
A101-A99
A139-A143
A3-A1
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5 Environmental Requirements
Design, including materials, shall be consistent with the manufacture of units that meet the
following environmental reference points.
The reliability targets in this section are based on the expected field use environment for a desktop
product. The test sequence for new sockets will be developed using the knowledge-based reliability
evaluation methodology, which is acceleration factor dependent. A simplified process flow of this
methodology can be seen in Figure 5-1.
Figure 5-1. Flowchart of Knowledge-Based Reliability Evaluation Methodology
Develop Speculative
Establish the Market/
Stress Conditions Based
Expected Use
on Historical Data,
Content Experts, and
Literature Search
Environment for the
Technology
Perform Stressing to
Freeze Stressing
Validate Accelerated
Requirements and
Stressing Assumptions
Perform Additional Data
and Determine
Turns
Acceleration Factors
A detailed description of this methodology can be found at:
The use environment expectations assumed are for desktop processors, based on an expected life of
7 to 10 years, are listed in Table 5-1. The target failure rates are <1% at 7 years and <3% at 10
years.
Table 5-1. Use Conditions Environment
Speculative Stress
Condition
7 Year Life
Expectation
10 Year Life
Expectation
Use Environment
Slow small internal gradient changes due
to external ambient (temperature cycle or
externally heated).
Temperature Cycle
1500 cycles with a
2150 cycles with
a mean ∆T =
40OC
mean ∆T = 40OC
High ambient moisture during low-power
state (operating voltage).
THB / HAST
BAKE
62,000 hrs at
30°C, 85% RH
89,000 hrs at
30°C, 85%RH
High Operating temperature and short
duration high temperature exposures.
62,000 hrs at
Tjmax
89,000 hrs at
Tjmax
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Environmental Requirements
Table 5-1. Use Conditions Environment (Continued)
Speculative Stress
Condition
7 Year Life
Expectation
10 Year Life
Expectation
Use Environment
Fast, large gradient on/off to max
operating temp. (power cycle or
internally heated including power save
features).
Power Cycle
7,500 cycles
11,000 cycles
Shipping and Handling.
Mechanical Shock
3 drops / axis 6
axis
50g trapezoidal
profile; 170”/sec
Velocity change; 11
msec duration pulse
Shipping and Handling.
Random Vibration
10 min / axis, 3
axis
3.13 gRMS, random,
5 Hz - 20 Hz .01
g2/Hz sloping up to
.02 g2/Hz 20 Hz -
500 Hz .02 g2/Hz
5.1
Porosity Test
5.1.1
Porosity Test Method
Use EIA 364, Test Procedure 53A, Nitric acid test. Porosity test to be performed for 20 contacts,
randomly selected per socket, five sockets.
5.1.2
Porosity Test Criteria
Maximum of two pores per set of 20 contacts, as measured per EIA 364, Test Procedure 60.
5.2
Plating Thickness
Measure various plating thickness on contact surface per EIA 364, Test Procedure 48, Method C or
Method A. Test to be performed using 20 randomly selected contacts per socket, five sockets. No
plating thickness measured shall be less than the minimum plating thickness specified in
Section 3.9.3.
5.3
5.4
Solvent Resistance
Requirement: No damage to ink markings if applicable. EIA 364-11A.
Solderability
(Applicable for leaded sockets) Requirement: 95% coverage per ball/surface mount feature. EIA
364, Test Procedure 52, Class 2, Category 3. Test to be performed on 20 randomly selected contacts
per socket, five sockets.
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Environmental Requirements
5.5 Durability
Use per EIA 364, test procedure 09B. The same package pin field is to be used for 1st and 51st
cycles. Measure contact resistance when mated in 1st and 51st cycles. A spare package pin field is
used for 2nd through 50th cycles. A pair of new package pin fields to be used for each of the socket
samples. The package should be removed at the end of each de-actuation cycle and reinserted into
the socket.
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6 Validation Testing Requirements
This section of the document outlines the tests that must be successfully completed in order for the
supplier's socket to pass the design guidelines validation. It provides the test plan and procedure
required for validation.
6.1
Applicable Documents
EIA-364-C.
Electrical Mechanical and Thermal Specification (EMTS)*
Thermal Design Guidelines Document*
Note: *For details on ordering this documentation, contact your Intel field sales representative.
6.2
6.3
Testing Facility
Testing will be performed by Intel's designated test facility.
Funding
Socket supplier will fund socket validation testing for their socket. Any additional testing that is
required due to design modifications will also be at the expense of the supplier.
6.4
Socket Design Verification
At the earliest possible date, a detailed drawing of the socket supplier's mPGA604 socket must be
provided to Intel for review. This drawing should include all of the features called out in this design
guideline (marking, pinout, cam location, date code location and explanation, etc.) as well as
dimensional and board layout information. This drawing will be used to confirm compliance to this
design guideline.
6.5
6.6
Reporting
Test reports of the socket validation testing will be provided directly from the independent test
facility to Intel. Intel will also be given access to contact the test facility directly to obtain socket
validation status, explanation of test results and recommendations based on the test results.
Process Changes
Any significant change to the socket will require submission of a detailed explanation of the change
at least 60 days prior to the planned implementation. Intel will review the modification and establish
the necessary re-validation procedure that the socket must pass. Any testing that is required MUST
be completed before the change is implemented.
Typical examples of significant changes include, but are not limited to, the following: Plastic
material changes including base material or color; contact changes including base material, plating
material or thickness; and design modifications.
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Validation Testing Requirements
6.7
Quality Assurance Requirements
The OEM’s will work with the socket supplier(s) they choose to ensure socket quality.
6.8
Socket Test Plan
6.8.1
Submission of an mPGA604 Socket for Validation Testing
The socket supplier's mPGA604 socket will be sent to Intel's independent test facility for socket
validation testing. The sockets submitted must be per the drawing required in Section 6.4. Refer to
Sections 6.11 and 6.12 for production lot definition and number of samples required for validation
testing.
6.9
Mechanical Samples
A mechanical sample of mPGA604 socket, package, and heatsink (or suitable mockups that
approximate size and mass of the planned heatsink) will be used during the mated socket validation
testing. The maximum mass for mPGA604 socket package heatsink is recommended as (but not
limited to) 450g with the stipulation that the requirements of Section 3.1 be met. See data sheet and
related documentation for further information on heatsinks, thermal solutions and mechanical
support.
6.10
6.11
Socket Validation Notification
Upon completion of the testing and receipt of test data, Intel and/or the Intel designated test facility
will prepare a summary report for the socket supplier and Intel that will provide notification as to
whether the socket has passed or failed socket validation testing.
Production Lot Definition
A production lot is defined as a separate process run through the major operations including
molding, contact stamping, contact plating and assembly. These lots should be produced on separate
shifts or days of the week. Lot identification marking needs to be provided to Intel as verification of
this process.
6.12
Socket Validation
Socket validation must meet or exceed all guidelines called out in this spec which include: Visual
Inspection, CTF Dimensional Verification, Electrical Resistance, Loop Inductance, Pin to Pin
Capacitance, Contact Current Rating, Dielectric Withstand Voltage, Insulation, Durability, Porosity,
Plating Thickness, Solvent Resistance (if applicable), Solderability (Applicable for leaded sockets),
Post Reliability Visual and use conditions. The use conditions target failure rates are <1% at 7 years
and <3% at 10 years. Statistical sample sizes, taken randomly from multiple lots, for each test is
required.
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7 Safety Requirements
Design, including materials, shall be consistent with the manufacture of units that meet the
following safety standards:
•
•
•
•
UL 1950 most current editions.
CSA 950 most current edition.
EN60 950 most current edition and amendments.
IEC60 950 most current edition and amendments.
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8 Documentation Requirements
The socket supplier shall provide Intel with the following documentation:
•
•
•
Multi-Line Coupled SPICE models for socket.
Product design guideline incorporating the requirements of these design guidelines.
Recommended board layout guidelines for the socket consistent with low cost, high volume
printed circuit board technology.
The test facility shall provide Intel and the supplier with the following document:
•
Validation Testing and Test Report supporting successful compliance with these design
guidelines.
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A Appendix A
Figure A-1. 42.5 mm, 604-Pin Package Assembly Drawing (Sheet 1 of 3)
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Appendix A
Figure A-2. 42.5 mm, 604-Pin Package Assembly Drawing (Sheet 2 of 3)
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Appendix A
Figure A-3. 42.5 mm, 604-Pin Package Assembly Drawing (Sheet 3 of 3)
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Appendix A
Figure A-4. mPGA604 Socket Drawing (Sheet 1 of 3)
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Appendix A
Figure A-5. mPGA604 Socket Drawing (Sheet 2 of 3)
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Appendix A
Figure A-6. mPGA604 Socket Drawing (Sheet 3 of 3)
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Appendix A
Figure A-7. 603-Pin Interposer Assembly Drawing (Sheet 1 of 7)
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Appendix A
Figure A-8. 603-Pin Interposer Assembly Drawing (Sheet 2 of 7)
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Appendix A
Figure A-9. 603-Pin Interposer Assembly Drawing (Sheet 3 of 7)
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Appendix A
Figure A-10. 603-Pin Interposer Assembly Drawing (Sheet 4 of 7)
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Appendix A
Figure A-11. 603-Pin Interposer Assembly Drawing (Sheet 5 of 7)
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Appendix A
Figure A-12. 603-Pin Interposer Assembly Drawing (Sheet 6 of 7)
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Appendix A
Figure A-13. 603-Pin Interposer Assembly Drawing (Sheet 7 of 7)
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