A1301 and A1302
Continuous-Time Ratiometric Linear Hall Effect Sensors
Features and Benefits
Description
▪ Low-noise output
TheA1301 andA1302 are continuous-time, ratiometric, linear
Hall-effect sensors. They are optimized to accurately provide
a voltage output that is proportional to an applied magnetic
field. These devices have a quiescent output voltage that is
50% of the supply voltage. Two output sensitivity options are
provided: 2.5 mV/G typical for the A1301, and 1.3 mV/G
typical for the A1302.
▪ Fast power-on time
▪ Ratiometric rail-to-rail output
▪ 4.5 to 6.0 V operation
▪ Solid-state reliability
▪ Factory-programmed at end-of-line for optimum
performance
▪ Robust ESD performance
The Hall-effect integrated circuit included in each device
includes a Hall sensing element, a linear amplifier, and a
CMOS Class A output structure. Integrating the Hall sensing
element and the amplifier on a single chip minimizes many
of the problems normally associated with low voltage level
analog signals.
High precision in output levels is obtained by internal gain
and offset trim adjustments made at end-of-line during the
manufacturing process.
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
These features make the A1301 and A1302 ideal for use in
position sensing systems, for both linear target motion and
rotational target motion. They are well-suited for industrial
applications over extended temperature ranges, from –40°C
to 125°C.
Two device package types are available: LH, a 3-pin SOT23W
type for surface mount, and UA, a 3-pin ultramini SIP for
through-hole mount. They are lead (Pb) free (suffix, –T) with
100% matte tin plated leadframes.
Not to scale
Functional Block Diagram
V+
VCC
Voltage
Regulator
VOUT
Out
Amp
Gain
Offset
C
BYPASS
Trim
Control
GND
A1301-DS, Rev. 5
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A1301 and
A1302
Continuous-Time Ratiometric
Linear Hall Effect Sensors
DEVICE CHARACTERISTICS over operating temperature range, TA, and VCC = 5 V, unless otherwise noted
Characteristic
Electrical Characteristics
Supply Voltage
Symbol
Test Conditions
Min.
Typ.
Max.
Units
VCC
ICC
Running, TJ < 165°C
Output open
4.5
–
–
6
11
–
V
mA
V
Supply Current
–
VOUT(High) ISOURCE = –1 mA, Sens = nominal
VOUT(Low) ISINK = 1 mA, Sens = nominal
BW
4.65
–
4.7
0.2
20
Output Voltage
0.25
–
V
Output Bandwidth
Power-On Time
–
kHz
VCC(min) to 0.95 VOUT; B = ±1400 G;
tPO
–
–
–
3
2
5
5
–
μs
Ω
Slew rate = 4.5 V/μs to 4.5 V/100 ns
Output Resistance
Wide Band Output Noise, rms
ROUT
ISINK ≤ 1 mA, ISOURCE ≥ –1 mA
External output low pass filter ≤ 10 kHz;
VOUTN
150
μV
Sens = nominal
Ratiometry
Quiescent Output Voltage Error
with respect to ΔVCC
ΔVOUTQ(V) TA = 25°C
ΔSens(V) TA = 25°C
–
–
–
–
±3.0
±3.0
%
%
1
Magnetic Sensitivity Error with
2
respect to ΔVCC
Output
Linearity
Lin
TA = 25°C
TA = 25°C
–
–
–
–
±2.5
±3.0
%
%
Symmetry
Sym
Magnetic Characteristics
Quiescent Output Voltage
VOUTQ
B = 0 G; TA = 25°C
2.4
2.2
2.5
–
2.6
2.8
V
V
Quiescent Output Voltage over
Operating Temperature Range
VOUTQ(ΔT ) B = 0 G
A
A1301; TA = 25°C
2.0
1.0
2.5
1.3
–
3.0
1.6
mV/G
mV/G
mV/G
mV/G
Magnetic Sensitivity
Sens
A1302; TA = 25°C
A1301
1.8
3.2
Magnetic Sensitivity over
Operating Temperature Range
Sens(ΔT )
A
A1302
0.85
–
1.75
1Refer to equation (4) in Ratiometric section on page 4.
2Refer to equation (5) in Ratiometric section on page 4.
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
3
Worcester, Massachusetts 01615-0036 (508) 853-5000
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A1301 and
A1302
Continuous-Time Ratiometric
Linear Hall Effect Sensors
Characteristic Definitions
Ratiometric. The A1301 and A1302 feature a ratiometric
output. This means that the quiescent voltage output, VOUTQ
Quiescent Output Voltage. In the quiescent state (no sig-
nificant magnetic field: B = 0), the output, VOUTQ, equals one
half of the supply voltage, VCC, throughout the entire operating
ranges of VCC and ambient temperature, TA. Due to internal
component tolerances and thermal considerations, there is a
tolerance on the quiescent output voltage, ΔVOUTQ, which is
a function of both ΔVCC and ΔTA. For purposes of specifica-
tion, the quiescent output voltage as a function of temperature,
,
and the magnetic sensitivity, Sens, are proportional to the supply
voltage, VCC
.
The ratiometric change (%) in the quiescent voltage output is
defined as:
VOUTQ(V
VOUTQ(5V)
)
CC
ΔVOUTQ(ΔV)
(4)
=
× 100%
ΔVOUTQ(ΔT ), is defined as:
VCC
5 V
A
and the ratiometric change (%) in sensitivity is defined as:
–
VOUTQ(Τ
VOUTQ(25ºC)
)
Α
(1)
ΔVOUTQ(ΔΤ
=
)
Α
Sens(V
Sens(5V)
)
CC
Sens(25ºC)
(5)
ΔSens(ΔV)
=
× 100%
VCC
5 V
where Sens is in mV/G, and the result is the device equivalent
accuracy, in gauss (G), applicable over the entire operating tem-
perature range.
Linearity and Symmetry. The on-chip output stage is
Sensitivity. The presence of a south-polarity (+B) magnetic
field, perpendicular to the branded face of the device package,
increases the output voltage, VOUT, in proportion to the magnetic
field applied, from VOUTQ toward the VCC rail. Conversely, the
application of a north polarity (–B) magnetic field, in the same
orientation, proportionally decreases the output voltage from its
quiescent value. This proportionality is specified as the magnetic
sensitivity of the device and is defined as:
designed to provide linear output at a supply voltage of 5 V.
Although the application of very high magnetic fields does not
damage these devices, it does force their output into a nonlinear
region. Linearity in percent is measured and defined as:
–
VOUT(+B) VOUTQ
Lin+
=
× 100%
(6)
(7)
2 (VOUT(+B½) – VVOUTQ
)
VOUT(–B) – VOUT(+B)
–
VOUT(–B) VOUTQ
(2)
Sens
=
Lin–
=
2B
× 100%
× 100%
2(VOUT(–B½) – VOUTQ
)
The stability of the device magnetic sensitivity as a function of
and output symmetry as:
ambient temperature, ΔSens(ΔT ) (%) is defined as:
A
–
VOUT(+B) VOUTQ
Sens(Τ – Sens(25ºC)
)
Α
(8)
(3)
ΔSens(ΔΤ
Sym
× 100%
=
=
)
Α
VOUTQ – VOUT(–B)
Sens(25ºC)
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
4
Worcester, Massachusetts 01615-0036 (508) 853-5000
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A1301 and
A1302
Continuous-Time Ratiometric
Linear Hall Effect Sensors
Typical Characteristics
(30 pieces, 3 fabrication lots)
1301 Device Sensitivity vs. Ambient Temperature
1302 Device Sensitivity vs. Temperature
1.40
1.38
1.36
1.34
1.32
1.30
1.28
1.26
1.24
2.65
2.60
2.55
2.50
2.45
2.40
UA Package
UA Package
LH Package
LH Package
2.35
-50 -25
0
25 50 75 100 125 150
Temperature (°C)
–50 –25
0
25 50 75 100 125 150
Temperature (°C)
1301 Device VOUTQ vs. Ambient Temperature
1302 Device VOUTQ vs. Ambient Temperature
2.60
2.55
2.50
2.45
2.40
2.60
2.55
2.50
2.45
2.40
–50 –25
0
25
50
75 100 125 150
–50 –25
0
25
50
75 100 125 150
Temperature (°C)
Temperature (°C)
1301 Device Sensitivity vs. Supply Voltage
1302 Device Sensitivity vs. Supply Voltage
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
3.5
3.0
2.5
2.0
1.5
4.5
5.0 5.5
Supply Voltage (V)
6.0
4.5
5.0
5.5
6.0
Supply Voltage (V)
Continued on the next page...
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
5
Worcester, Massachusetts 01615-0036 (508) 853-5000
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A1301 and
A1302
Continuous-Time Ratiometric
Linear Hall Effect Sensors
Typical Characteristics, continued
(30 pieces, 3 fabrication lots)
1302 Device VOUTQ vs. Supply Voltage
1301 Device VOUTQ vs. Supply Voltage
3.5
3.0
2.5
2.0
1.5
3.5
3.0
2.5
2.0
1.5
4.5
5.0
5.5
6.0
4.5
5.0
5.5
6.0
Supply Voltage (V)
Supply Voltage (V)
1302 Device LIN+ and LIN– vs. Supply Voltage
1301 Device LIN+ and LIN– vs. Supply Voltage
100.4
100.3
100.2
100.1
100.0
99.9
100.0
99.9
99.8
99.7
99.6
LIN+
LIN–
LIN–
LIN+
99.8
4.5
5.0
5.5
6.0
4.5
5.0
5.5
6.0
Supply Voltage (V)
Supply Voltage (V)
1302 Device Symmetry vs. Supply Voltage
1301 Device Symmetry vs. Supply Voltage
100.0
99.9
99.8
99.7
99.6
99.5
99.4
99.3
99.2
99.1
99.0
100.5
100.4
100.3
100.2
100.1
100.0
99.9
99.8
99.7
99.6
99.5
4.5
5.0
5.5
6.0
4.5
5.0
Supply Voltage (V)
5.5
6.0
Supply Voltage (V)
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
6
Worcester, Massachusetts 01615-0036 (508) 853-5000
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A1301 and
A1302
Continuous-Time Ratiometric
Linear Hall Effect Sensors
Package LH, 3-Pin; (SOT-23W)
3.00 .118
2.70 .106
0.15 [.006] M
C
A
B
3.04 .120
2.80 .110
A
1.49 .059
NOM
8º
0º
B
B
A
3
0.20 .008
0.08 .003
2.10 .083
1.85 .073
A
0.96 .038
A NOM
Preliminary dimensions, for reference only
Dimensions in millimeters
U.S. Customary dimensions (in.) in brackets, for reference only
(reference JEDEC TO-236 AB, except case width and terminal tip-to-tip)
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
0.60 .024
0.25 .010
1
2
A
B
Hall element (not to scale)
0.25 .010
Active Area Depth 0.28 [.011]
C
3X
SEATING PLANE
GAUGE PLANE
SEATING
PLANE
0.10 [.004]
C
0.50 .020
0.30 .012
3X
1.17 .046
0.75 .030
0.20 [.008] M
C
A
B
0.15 .006
0.00 .000
0.95 .037
1.90 .075
Pin-out Drawings
Package UA
Package LH
3
1
2
1
2
3
Terminal List
Number
Symbol
Description
Package LH
Package UA
VCC
VOUT
GND
1
2
3
1
3
2
Connects power supply to chip
Output from circuit
Ground
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7
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Worcester, Massachusetts 01615-0036 (508) 853-5000
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A1301 and
A1302
Continuous-Time Ratiometric
Linear Hall Effect Sensors
Package UA, 3-Pin SIP
.164 4.17
.159 4.04
C
D
.0805 2.04
NOM
.062 1.57
.058 1.47
D
1.44
.0565
NOM
.122 3.10
.117 2.97
B
.085 2.16
MAX
.031 0.79
REF
A
.640 16.26
.600 15.24
.017 0.44
.014 0.35
1
2
3
.019 0.48
.014 0.36
.050 1.27
NOM
Dimensions in inches
Metric dimensions (mm) in brackets, for reference only
A
Dambar removal protrusion (6X)
Ejector mark on opposite side
B
C
D
Active Area Depth .0195 [0.50] NOM
Hall element (not to scale)
The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283;
5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required
to permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify
that the information being relied upon is current.
Allegro products are not authorized for use as critical components in life-support devices or systems without express written approval.
The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for
its use; nor for any infringement of patents or other rights of third parties which may result from its use.
Copyright © 2005, 2006 Allegro MicroSystems, Inc.
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
8
Worcester, Massachusetts 01615-0036 (508) 853-5000
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