Sensitive Two-Wire Chopper-Stabilized

Unipolar Hall Effect Switches

A1140, A1141,

A1142, and A1143

2

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

features on-chip transient protection and a Zener clamp to protect

against overvoltage conditions on the supply line.

The output currents of the A1141 and A1143 switch HIGH in the

presence of a south (+) polarity magnetic field of sufficient strength,

and switch LOW otherwise, as in the presence of a weak field or a

north (–) polarity field. The other two devices in the family (A1140

and A1142) have an opposite output: the currents switch LOW in

the presence of a south-polarity magnetic field of sufficient strength,

and switch HIGH otherwise. The other differences in the switches

are their defined low current levels and magnetic switchpoints.

All versions are offered in two package styles. The LH is a SOT-

23W, miniature low-profile package for surface-mount applications.

The UA is a three-lead ultramini SIP for through-hole mounting.

Each package is available in a lead (Pb) free version (suffix, –T)

with 100% matte tin plated leadframe. Field-programmable versions

also available: A1180, A1181, A1182, and A1183.

Absolute Maximum Ratings

Characteristic

Symbol

Notes

Rating

Units

Supply Voltage

28

V

Reverse Supply Voltage

–18

V

Magnetic Flux Density

B

Unlimited

G

Operating Ambient Temperature

Range E

–40 to 85

ºC

Range L

–40 to 150

ºC

Maximum Junction Temperature

165

ºC

Storage Temperature

–65 to 170

ºC

Description (continued)

NC

1

2

3

1. VCC

2. No connection

3. GND

1

2

3

1. VCC

2. GND

3. GND

Package LH, 3-pin SOT

Package UA, 3-pin SIP