Datasheet A1301, A1302 Datasheet (ALLEGRO)

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Continuous-Time Ratiometric Linear Hall Effect Sensors

Package LH, 3-pin Surface Mount

1. VCC

2. VOUT

3. GND

Package UA, 3-pin SIP

1. VCC

2. GND

3. VOUT

1

2

1

2

3

A1301 and A1302

The A1301 and A1302 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.

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

3

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.

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 well­suited 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. Each package is
available in a lead (Pb) free version (suffix, –T) with 100% matte tin plated lead­frame.

AB SO LUTE MAX I MUM RAT INGS

Supply Voltage, VCC............................................8 V

Output Voltage, V
Reverse-Supply Voltage, V
Reverse-Output Voltage, V
Output Sink Current, I
Operating Temperature
Ambient, T
Ambient, T
Maximum Junction, T
Storage Temperature, T

A1301-DS, Rev. 2

.......................................... 8 V

OUT

OUT

, Range E..................–40ºC to 85ºC

A

, Range K ...............–40ºC to 125ºC

A

.......................–0.1 V

RCC

.....................–0.1 V

ROUT

............................. 10 mA

........................165ºC

J(max)

.................. –65ºC to 170ºC

S

Features and Benefits

Low-noise output

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

Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

www.allegromicro.com

A1301 and A1302

Continuous-Time Ratiometric Linear Hall Effect Sensors

Product Selection Guide

Part Number Pb-free Packing* Package

A1301ELHLT –

A1301ELHLT-T Yes

A1301EUA –

A1301EUA-T Yes

A1301KLHLT –

A1301KLHLT-T Yes

A1301KUA –

A1301KUA-T Yes

A1302ELHLT –

A1302ELHLT-T Yes

A1302EUA –

A1302EUA-T Yes

A1302KLHLT –

A1302KLHLT-T Yes

A1302KUA –

A1302KUA-T Yes

7-in. tape and reel, 3000 pieces/reel Surface Mount

Bulk, 500 pieces/bag SIP

7-in. tape and reel, 3000 pieces/reel Surface Mount

Bulk, 500 pieces/bag SIP

7-in. tape and reel, 3000 pieces/reel Surface Mount

Bulk, 500 pieces/bag SIP

7-in. tape and reel, 3000 pieces/reel Surface Mount

Bulk, 500 pieces/bag SIP

*Contact Allegro for additional packing options.

Functional Block Diagram

V+

VCC

Ambient, T

A

–40ºC to 85ºC

–40ºC to 125ºC

–40ºC to 85ºC

–40ºC to 125ºC

Sensitivity (Typical)

2.5 mV/G

1.3 mV/G

Voltage

Regulator

Out

Offset

Trim

Control

C

BYPASS

Amp

Gain

Filter

GND

Terminal List

Symbol Description

Package LH Package UA

Number

VCC Connects power supply to chip 1 1

VOUT Output from circuit 2 3

GND Ground 3 2

VOUT

A1301-DS, Rev. 2

Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

www.allegromicro.com

2

A1301 and A1302

Continuous-Time Ratiometric Linear Hall Effect Sensors

DEVICE CHARACTERISTICS over operating temperature range, T

, and VCC = 5 V, unless otherwise noted

A

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Electrical Characteristics

Supply Voltage V
Supply Current I

V

Output Voltage

OUT(High)ISOURCE

V

OUT(Low)ISINK

CC

CC

Running, TJ < 165°C 4.5 – 6 V
Output open – – 11 mA

= –1 mA, Sens = nominal 4.65 4.7 – V

= 1 mA, Sens = nominal – 0.2 0.25 V

Output Bandwidth BW – 20 – kHz

Power-On Time t

Output Resistance R

Wide Band Output Noise, rms V

PO

OUT

OUTN

V
Slew rate = 4.5 V/µs to 4.5 V/100 ns

I
External output low pass filter ≤ 10 kHz;

Sens = nominal

CC(min)

SINK

to 0.95 V

≤ 1 mA, I

OUT;

SOURCE

B = ±1400 G;

–35µs

≥ –1 mA – 2 5 Ω

– 150 – µV

Ratiometry

Quiescent Output Voltage Error
with respect to ∆V

CC

1

Magnetic Sensitivity Error with
respect to ∆V

CC

2

∆V

OUTQ(V)TA

∆Sens

(V)TA

= 25°C – – ±3.0 %

= 25°C – – ±3.0 %

Output

Linearity Lin TA = 25°C – – ±2.5 %
Symmetry Sym TA = 25°C – – ±3.0 %

Magnetic Characteristics

Quiescent Output Voltage V
Quiescent Output Voltage over

Operating Temperature Range

OUTQ

V

OUTQ(∆TA)

Magnetic Sensitivity Sens

Magnetic Sensitivity over
Operating Temperature Range

1

Refer to equation (4) in Ratiometric section on page 4.

2

Refer to equation (5) in Ratiometric section on page 4.

Sens

B = 0 G; TA = 25°C 2.4 2.5 2.6 V

B = 0 G 2.2 – 2.8 V

A1301; T
A1302; T

= 25°C 2.0 2.5 3.0 mV/G

A

= 25°C 1.0 1.3 1.6 mV/G

A

A1301 1.8 – 3.2 mV/G

(∆TA)

A1302 0.85 – 1.75 mV/G

A1301-DS, Rev. 2

Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

www.allegromicro.com

3

A1301 and A1302

V

CC

5V

∆V

OUTQ(VCC)

∆V

OUTQ(5V)

∆V

OUTQ(∆V)

=

× 100%

V

CC

5V

=

× 100%

∆Sens

(∆V)

Sens

(VCC)

Sens

(5V)

=

× 100%

Lin+

2 (V

OUT(+B½)

–V

VOUTQ

)

–

V

OUT(+B)VOUTQ

=

× 100%

Lin–

2(V

OUT(–B½)–VOUTQ

)

–

V

OUT(–B)VOUTQ

–

=

× 100%

Sym

V

OUT(+B)

V

OUTQ–VOUT(–B)

V

OUTQ

Continuous-Time Ratiometric Linear Hall Effect Sensors

Characteristic Definitions

Quiescent Output Voltage. In the quiescent state (no sig-
nificant magnetic field: B = 0), the output, V

, equals one

OUTQ

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, however,
there is a tolerance on the quiescent output voltage, ∆V

OUTQ

,
which is a function of both ∆VCC and ∆TA. For purposes of speci­fication, the quiescent output voltage as a function of tempera­ture, ∆V

OUTQ(∆TA)

∆V

, is defined as:

OUTQ(∆ΤΑ)

V

OUTQ(ΤΑ)VOUTQ(25ºC)

=

Sens

–

(25ºC)

(1)

where Sens is in mV/G, and the result is the device equivalent
accuracy, in gauss (G), applicable over the entire operating tem­perature range.

Sensitivity. The presence of a south-polarity (+B) magnetic
field, perpendicular to the branded face of the device package,
increases the output voltage, V
field applied, from V

toward the VCC rail. Conversely, the

OUTQ

, in proportion to the magnetic

OUT

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:

(2)

Sens

V

OUT(–B)VOUT(+B)

=

–

2B

The stability of the device magnetic sensitivity as a function of
ambient temperature, ∆ Sens

Sens

∆Sens

(∆ΤΑ)

(ΤΑ)

=

(%) is defined as:

( ∆TA)

Sens

–

Sens

(25ºC)

(25ºC)

× 100%

(3)

Ratiometric. The A1301 and A1302 feature a ratiometric
output. This means that the quiescent voltage output, V

OUTQ

,
and the magnetic sensitivity, Sens, are proportional to the supply
voltage, VCC.

The ratiometric change (%) in the quiescent voltage output is
defined as:

(4)

and the ratiometric change (%) in sensitivity is defined as:

(5)

Linearity and Symmetry. The on-chip output stage is
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:

(6)

(7)

and output symmetry as:

(8)

A1301-DS, Rev. 2

Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

www.allegromicro.com

4

A1301 and A1302

2.40

2.45

2.50

2.55

2.60

–50 –25 0 25 50 75 100 125 150

2.40

2.45

2.50

2.55

2.60

–50 –25 0 25 50 75 100 125 150

4.5 5.0 5.5 6.0

4.5 5.0 5.5 6.0

Continuous-Time Ratiometric Linear Hall Effect Sensors

Typical Characteristics

(30 pieces, 3 fabrication lots)

1301 Dev ice Sensitivity vs. Ambient Tem perature 1302 Dev ice Sensitivity vs. Temperature

2.65

2.60

2.55

2.50

2.45

Sensitivity (mV/G)

2.40

2.35
–50

–25 0 25 50 75 100 125 150

UA Package

LH Package

Temperature (°C)

1.40

1.38

1.36

1.34

1.32

1.30

Sensitivity (mV/G)

1.28

1.26

1.24

-50

-25 0 25 50 75 100 125 150

UA Package

LH Package

Temperature (°C)

Output Voltage (V)

Sensitivity (mV/G)

3.5

3.0

2.5

2.0

1.5

1301 Dev ice V

1301 Dev ice Sensitivity v s. Supply Voltage

vs. Ambient Temperature 1302 Dev ice V

OUTQ

Temperature (°C)

Supply Voltage (V)

Output Voltage (V)

Sensitivity (mV/G)

1.7

1.6

1.5

1.4

1.3

1.2

1.1

1.0

vs. Ambient Temperature

OUTQ

Temperature (°C)

1302 Dev ice Sensitivity v s. Supply Voltage

Supply Voltage (V)

Continued on the next page...

A1301-DS, Rev. 2

Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

www.allegromicro.com

5

A1301 and A1302

Continuous-Time Ratiometric Linear Hall Effect Sensors

Typical Characteristics, continued

(30 pieces, 3 fabrication lots)

1301 Dev ice V

3.5

3.0

2.5

Output Voltage (V)

2.0

1.5

4.5 5.0 5.5 6.0
Supply Voltage (V)

1301 Dev ice LIN+ and LIN– vs. Supply V oltage

100.4

100.3

100.2

100.1

100.0

Linearity (%)

99.9

vs. Supply Voltage

OUTQ

LIN–

LIN+

1302 Dev ice V

3.5

3.0

2.5

Output Voltage (V)

2.0

1.5

4.5 5.0 5.5 6.0
Supply Voltage (V)

1302 Dev ice LIN+ and LIN– vs. Supply V oltage

100.0

99.9

99.8

Linearity (%)

99.7

vs. Supply Voltage

OUTQ

LIN+

LIN–

99.8

4.5

100.0

99.9

99.8

99.7

99.6

99.5

99.4

99.3

Symmetry (%)

99.2

99.1

99.0

4.5 5.0 5.5 6.0

A1301-DS, Rev. 2

5.0 5.5 6.0
Supply Voltage (V)

1301 Dev ice Symmetry v s. Supply Voltage

Supply Voltage (V)

99.6

4.5

1302 Dev ice Symmetry v s. Supply Voltage

100.5

100.4

100.3

100.2

100.1

100.0

99.9

99.8

Symmetry (%)

99.7

99.6

99.5

4.5 5.0 5.5 6.0

5.0 5.5 6.0
Supply Voltage (V)

Supply Voltage (V)

Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

www.allegromicro.com

6

3.00

2.70

.118
.106

2.10

1.85

.083
.073

0.50 .020

0.30

0.55
REF

A1301 and A1302

Continuous-Time Ratiometric Linear Hall Effect Sensors

Package LH, 3-Pin; (SOT-23W)

3.10

.122

2.90

.114

1.49

0.96
NOM

.022

.038

.012

.059

3

NOM

0.28

.011

NOM

A

21

1.13

0.87

0.95
BSC

.037

0.15

0.00

.006
.000

.045
.034

8º
0º

0.20

0.13

0.25
MIN

0.25

.010

BSC

Seating Plane

Gauge Plane

.008
.005

.010

1.00
BSC

.039

0.70
BSC

Dimensions in millimeters
U.S. Customary dimensions (in.) in brackets, for reference only

A

Hall element

B

Active Area Depth 0.28 [.011]

C

Fits SC–59A Solder Pad Layout

.028

C

2.40

.094

BSC

0.95

.037

BSC

.122
.117

3.10

2.97

.640
.600

Package UA, 3-Pin; (TO-92)

.164

4.17

.159

4.04

45°
BSC

.0805

16.26

15.24

.0565
NOM

.085
MAX

2.04

NOM

1.44

B

2.16

A

231

.019

0.48

.014

0.36

Dimensions in inches
Metric dimensions (mm) in brackets, for reference only

A

Dambar removal protrusion

B

Hall element

.050
BSC

.062
.058

1.27

.031
REF

.017
.014

1.57

1.47

0.79

0.44

0.35

.0195
NOM

0.50

45°
BSC

A1301-DS, Rev. 2

Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

www.allegromicro.com

7

A1301 and A1302

Continuous-Time Ratiometric Linear Hall Effect Sensors

A1301-DS, Rev. 2

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 de par tures from the detail spec i fi ca tions as may be required
to permit improvements in the per for mance, 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 sys tems without express written approval.

The in for ma tion in clud ed herein is believed to be ac cu rate and reliable.
How ev er, Allegro MicroSystems, Inc. assumes no re spon si bil i ty for its
use; nor for any in fringe ment of patents or other rights of third parties
which may result from its use.

Copyright © 2005, Allegro MicroSystems, Inc.

Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

www.allegromicro.com

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