A1141 ALLEGRO [Allegro MicroSystems], A1141 Datasheet

A1141

Manufacturer Part Number

A1141

Description

Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches

Manufacturer

ALLEGRO [Allegro MicroSystems]

Datasheet

1.A1141.pdf (13 pages)

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Features and Benefits

▪ Chopper stabilization

▪ Factory programmed at end-of-line for optimized

▪ On-chip protection

Packages: 3 pin SOT23W (suffix LH), and

3 pin SIP (suffix UA)

Not to scale

A1140-DS, Rev. 8

switchpoints

▫ Low switchpoint drift over operating

▫ Low sensitivity to stress

▫ Supply transient protection

▫ Reverse-battery protection

▫ On-board voltage regulator

▫ 3.5 to 24 V operation

temperature range

V+

0.01 uF

VCC

Functional Block Diagram

Sensitive Two-Wire Chopper-Stabilized

Clock/Logic

Amp

Low-Pass

Filter

Unipolar Hall Effect Switches

Description

The A1140, A1141, A1142, and A1143 devices are sensitive,

two-wire, unipolar, Hall effect switches that are factory-

programmed at end-of-line to optimize magnetic switchpoint

accuracy. These devices use a patented high frequency chopper-

stabilization technique, produced using the Allegro advanced

BiCMOS wafer fabrication process, to achieve magnetic

stability and to eliminate offset inherent in single-element

devices exposed to harsh application environments.

Commonly found in a number of automotive applications,

these switches are utilized to sense seat track position,

seat belt buckle presence, hood/trunk latching, and shift

selector position. Two-wire unipolar switches, such as the

A1140/41/42/43 family, are particularly advantageous in

price-sensitive applications because they require one less

wire for operation than do switches with the more traditional

open-collector output. Additionally, the system designer

inherently gains diagnostics because there is always output

current flowing, which should be in either of two narrow

ranges. Any current level not within these ranges indicates a

fault condition. The A1140/41/42/43 family of switches also

Continued on the next page…

A1140, A1141, A1142, and A1143

Regulator

To All Subcircuits

Package UA Only

GND

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