A 1301

A1301 and A1302

A1301-DS, Rev. 2 Worcester, Massachusetts 01615-0036 (508) 853-5000115 Northeast Cutoff, Box 15036

www.allegromicro.com

Allegro MicroSystems, Inc.

AB SO LUTE MAX I MUM RAT INGS

Supply Voltage, VCC ............................................8 VOutput Voltage, VOUT ..........................................8 VReverse-Supply Voltage, VRCC .......................–0.1 VReverse-Output Voltage, VROUT .....................–0.1 VOutput Sink Current, IOUT ............................. 10 mAOperating Temperature Ambient, TA, Range E..................–40ºC to 85ºC Ambient, TA, Range K ...............–40ºC to 125ºC Maximum Junction, TJ(max)........................165ºCStorage Temperature, TS ..................–65ºC to 170ºC

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

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 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 adjust-ments 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 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. Each package is available in a lead (Pb) free version (suffix, –T) with 100% matte tin plated lead-frame.

Continuous-Time Ratiometric Linear Hall Effect Sensors

Features and Benefits

Package UA, 3-pin SIP

12

3

1. VCC2. GND3. VOUT

Package LH, 3-pin Surface Mount

12

31. VCC2. VOUT3. GND

2A1301-DS, Rev. 2 Worcester, Massachusetts 01615-0036 (508) 853-5000

115 Northeast Cutoff, Box 15036




A1301 and A1302

Functional Block Diagram

Amp

GND

VOUT

VCC

Out

Offset

Trim

Control

Gain

V+

Voltage

Regulator

Filter

CBYPASS

Terminal List

Symbol Description NumberPackage LH Package UA

VCC Connects power supply to chip 1 1VOUT Output from circuit 2 3GND Ground 3 2

Part Number Pb-free Packing* Package Ambient, TA Sensitivity (Typical)A1301ELHLT –

7-in. tape and reel, 3000 pieces/reel Surface Mount–40ºC to 85ºC

2.5 mV/G

A1301ELHLT-T YesA1301EUA –

Bulk, 500 pieces/bag SIPA1301EUA-T YesA1301KLHLT –


A1301KLHLT-T YesA1301KUA –

Bulk, 500 pieces/bag SIPA1301KUA-T YesA1302ELHLT –


1.3 mV/G

A1302ELHLT-T YesA1302EUA –

Bulk, 500 pieces/bag SIPA1302EUA-T YesA1302KLHLT –


A1302KLHLT-T YesA1302KUA –

Bulk, 500 pieces/bag SIPA1302KUA-T Yes

Product Selection Guide

*Contact Allegro for additional packing options.






A1301 and A1302

DEVICE CHARACTERISTICS over operating temperature range, TA, and VCC = 5 V, unless otherwise notedCharacteristic Symbol Test Conditions Min. Typ. Max. Units

Electrical CharacteristicsSupply Voltage VCC Running, TJ < 165°C 4.5 – 6 VSupply Current ICC Output open – – 11 mA

Output VoltageVOUT(High) ISOURCE = –1 mA, Sens = nominal 4.65 4.7 – VVOUT(Low) ISINK = 1 mA, Sens = nominal – 0.2 0.25 V

Output Bandwidth BW – 20 – kHz

Power-On Time tPOVCC(min) to 0.95 VOUT; B = ±1400 G; Slew rate = 4.5 V/µs to 4.5 V/100 ns – 3 5 µs

Output Resistance ROUT ISINK ≤ 1 mA, ISOURCE ≥ –1 mA – 2 5 Ω

Wide Band Output Noise, rms VOUTNExternal output low pass filter ≤ 10 kHz;Sens = nominal – 150 – µV

RatiometryQuiescent Output Voltage Error with respect to ∆VCC

1 ∆VOUTQ(V) TA = 25°C – – ±3.0 %

Magnetic Sensitivity Error with respect to ∆VCC

2 ∆Sens(V) TA = 25°C – – ±3.0 %

OutputLinearity Lin TA = 25°C – – ±2.5 %Symmetry Sym TA = 25°C – – ±3.0 %Magnetic CharacteristicsQuiescent Output Voltage VOUTQ B = 0 G; TA = 25°C 2.4 2.5 2.6 VQuiescent Output Voltage over Operating Temperature Range VOUTQ(∆TA) B = 0 G 2.2 – 2.8 V

Magnetic Sensitivity SensA1301; TA = 25°C 2.0 2.5 3.0 mV/GA1302; TA = 25°C 1.0 1.3 1.6 mV/G

Magnetic Sensitivity over Operating Temperature Range Sens(∆TA)

A1301 1.8 – 3.2 mV/GA1302 0.85 – 1.75 mV/G

1Refer to equation (4) in Ratiometric section on page 4.2Refer to equation (5) in Ratiometric section on page 4.






A1301 and A1302

Characteristic Definitions

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, however, there is a tolerance on the quiescent output voltage, ∆VOUTQ, which is a function of both ∆VCC and ∆TA. For purposes of speci-fication, the quiescent output voltage as a function of tempera-ture, ∆VOUTQ(∆TA), is defined as:

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.

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:

The stability of the device magnetic sensitivity as a function of ambient temperature, ∆ Sens (∆TA) (%) is defined as:

Ratiometric. The A1301 and A1302 feature a ratiometric output. This means that the quiescent voltage output, VOUTQ, and the magnetic sensitivity, Sens, are proportional to the supply voltage, VCC.

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

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

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:

and output symmetry as:

∆VOUTQ(∆ΤΑ)Sens(25ºC)

VOUTQ(ΤΑ) VOUTQ(25ºC)–

= (1)

2B

VOUT(–B) VOUT(+B)Sens

–=

∆Sens(∆ΤΑ)Sens(ΤΑ) Sens(25ºC)

Sens(25ºC)

–= × 100%

(2)

(3)

VCC 5 V

∆VOUTQ(VCC) ∆VOUTQ(5V)∆VOUTQ(∆V) = × 100% (4)

VCC 5 V= × 100%∆Sens(∆V)

Sens(VCC) Sens(5V) (5)

= × 100%Lin+2 (VOUT(+B½) – VVOUTQ )

–VOUT(+B) VOUTQ(6)

= × 100%Lin–2(VOUT(–B½) – VOUTQ)

–VOUT(–B) VOUTQ

(7)

–

= × 100%SymVOUT(+B)

VOUTQ – VOUT(–B)

VOUTQ (8)






A1301 and A1302

Typical Characteristics(30 pieces, 3 fabrication lots)

Continued on the next page...

2.35

2.40

2.45

2.50

2.55

2.60

2.65

–50 –25 0 25 50 75 100 125 1501.24

1.26

1.28

1.30

1.32

1.34

1.36

1.38

1.40

-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 1502.40

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

LH Package

UA Package

LH Package

UA Package

1301 Device Sensitivity vs. Ambient Temperature 1302 Device Sensitivity vs. Temperature

Temperature (°C) Temperature (°C)

1301 Device VOUTQ vs. Ambient Temperature 1302 Device VOUTQ vs. Ambient Temperature

1301 Device Sensitivity vs. Supply Voltage 1302 Device Sensitivity vs. Supply Voltage

Supply Voltage (V) Supply Voltage (V)

Temperature (°C) Temperature (°C)

Sensitivity(mV/G)

Sensitivity(mV/G)

OutputVoltage(V)

OutputVoltage(V)

Sensitivity(mV/G)

Sensitivity(mV/G)

1.5

2.0

2.5

3.0

3.5

1.0

1.1

1.2

1.3

1.4

1.5

1.6

1.7






A1301 and A1302

Typical Characteristics, continued(30 pieces, 3 fabrication lots)

1301 Device VOUTQ vs. Supply Voltage

4.5 5.0 5.5 6.01.5

2.0

2.5

3.0

3.5

4.5 5.0 5.5 6.0

4.5 5.0 5.5 6.0 4.5 5.0 5.5 6.0

99.0

99.1

99.2

99.3

99.4

99.5

99.6

99.7

99.8

99.9

100.0

4.5 5.0 5.5 6.099.5

99.6

99.7

99.8

99.9

100.0

100.1

100.2

100.3

100.4

100.5

4.5 5.0 5.5 6.0

Supply Voltage (V)

LIN–

LIN+LIN–

LIN+

99.6

99.7

99.8

99.9

100.0

99.8

99.9

100.0

100.1

100.2

100.3

100.4

1302 Device VOUTQ vs. Supply Voltage

1301 Device Symmetry vs. Supply Voltage 1302 Device Symmetry vs. Supply Voltage

1301 Device LIN+ and LIN– vs. Supply Voltage 1302 Device LIN+ and LIN– vs. Supply Voltage

OutputVoltage(V)

OutputVoltage(V)

Linearity(%)

Linearity(%)

Symmetry(%)

Symmetry(%)

Supply Voltage (V) Supply Voltage (V)

Supply Voltage (V)

Supply Voltage (V)Supply Voltage (V)

1.5

2.0

2.5

3.0

3.5






A1301 and A1302

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

2.40BSC

.094

1.00BSC

.039

0.70BSC

.028

3.102.90

.122

.114

2.101.85

.083

.073

3.002.70

.118

.106

0.55REF

.022

1.49NOM

.059

0.28NOM

.011

0.96NOM

.038

0.95BSC

.037

0.95BSC

.037

0.25MIN

.010

0.150.00

.006

.000

1.130.87

.045

.034

0.200.13

.008

.005

8º0º

0.50 .020.0120.30

0.25BSC

.010

Gauge Plane

Seating Plane

21

3

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

A Hall element

B Active Area Depth 0.28 [.011]

C

C

Fits SC–59A Solder Pad Layout

A

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

B

.164

.1594.174.04

.122

.1173.102.97

.062

.0581.571.47

.017

.0140.440.35

.019

.0140.480.36

.640 .600

16.2615.24

.085MAX

2.16

.050BSC

1.27

.031 REF

0.79

.0195 NOM

0.50

.0805NOM

2.04

1.44.0565NOM

45° BSC

45° BSC

Dimensions in inchesMetric dimensions (mm) in brackets, for reference only

2 31

A

A

B

Dambar removal protrusion

Hall element






A1301 and A1302

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 manufactur-ability 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.

A 1301

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