A1180/81/82/83

A1180-DS, Rev. 2

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

115 Northeast Cutoff, Box 15036

www.allegromicro.com

Allegro MicroSystems, Inc.

ABSOLUTE MAXIMUM RATINGS

Magnetic Flux Density, B .........................Unlimited

Operating Temperature

On-chip protection

Supply transient protection

Reverse-battery protection

On-board voltage regulator

3.5 V to 24 V operation

Sensitive Two-Wire Field-Programmable Chopper-Stabilized

Unipolar Hall-Effect Switches

Package LH, 3-pin SOT

Features and Benefits

1. VCC

2. No connection

3. GND

NC

1

2

3

1

2

3

1. VCC

2. GND

3. GND

Package UA, 3-pin SIP

Chopper stabilization

Low switchpoint drift over operating

temperature range

Low stress sensitivity

Field-programmable for optimized

switchpoints

The A1180, A1181, A1182, and A1183 devices are sensitive, two-wire, unipolar,

packaging of the sensor and placement into the application. This advanced feature

allows the optimization of the sensor switching performance, by effectively

accounting for variations caused by mounting tolerances for the device and the

target magnet.

This family of devices are produced on the Allegro MicroSystems advanced

BiCMOS wafer fabrication process, which implements a patented, high-frequency,

chopper-stabilization technique that achieves magnetic stability and eliminates

the offsets that are inherent in single-element devices exposed to harsh applica-

tion environments. Commonly found in a number of automotive applications,

the A1180-83 family of devices are utilized to sense: seat track position, seat belt

buckle presence, hood/trunk latching, and shift selector position.

Two-wire unipolar switches are particularly advantageous in price-sensitive appli-

cations, because they require one less wire than the more traditional open-collec-

tor output switches. Additionally, the system designer gains inherent diagnostics

because output current normally flows in either of two narrowly-specified ranges.

Any output current level outside of these two ranges is a fault condition. The

A1180-83 family of devices also features on-chip transient protection, and a Zener

clamp to protect against overvoltage conditions on the supply line.

when there is no significant magnetic field present. The A1180 and A1182 have

Both devices are offered in two package styles: LH, a SOT-23W miniature low-

profile package for surface-mount applications, and UA, a three-lead ultramini

Single Inline Package (SIP) for through-hole mounting. Each package is available

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

Factory-programmed versions are also available. Refer to: A1140, A1141, A1142,

A1143, A1145, and A1146.