A1125EUA-T Allegro Microsystems Inc, A1125EUA-T Datasheet

A1125EUA-T

Manufacturer Part Number

A1125EUA-T

Description

CHOPPER STABILIZED PRECISION HALL SWITCH

Manufacturer

Allegro Microsystems Inc

Type

Unipolar Switchr

Datasheets

1.A1120ELHLT-T2.pdf (9 pages)

2.A1125EUA-T.pdf (9 pages)

3.A1125EUA-T.pdf (9 pages)

Specifications of A1125EUA-T

Sensing Range

50G Trip, 5G Release

Voltage - Supply

3 V ~ 24 V

Current - Supply

4mA

Current - Output (max)

60mA

Output Type

Digital, Open Collector

Features

High Temperature

Operating Temperature

-40°C ~ 85°C

Package / Case

3-SIP

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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Features and Benefits

▪ Unipolar switchpoints

▪ Resistant to physical stress

▪ Superior temperature stability

▪ Output short-circuit protection

▪ Operation from unregulated supply

▪ Reverse battery protection

▪ Solid-state reliability

▪ Small package sizes

Packages:

A1120-DS, Rev. 10

3-pin SOT23W (suffix LH)

Not to scale

VCC

Chopper Stabilized Precision Hall Effect Switches

3-pin SIP (suffix UA)

Amp

Functional Block Diagram

Low-Pass

Filter

Description

The A1120 and A1125 Hall-effect, unipolar switches are

extremely temperature-stable and stress-resistant sensor ICs,

especially suited for operation over extended temperature

ranges to 150°C. Superior high-temperature performance is

made possible through dynamic offset cancellation, which

reduces the residual offset voltage normally caused by device

overmolding, temperature dependencies, and thermal stress.

Each device includes on a single silicon chip a voltage regulator,

Hall-voltage generator, small-signal amplifier, chopper

stabilization, Schmitt trigger, and a short-circuit protected

open-drain output to sink up to 25 mA.

An on-board regulator permits operation with supply voltages

of 3 to 24 V. The advantage of operating down to 3 V is that

the device can be used in 3 V applications or with additional

external resistance in series with the supply pin for greater

protection against high voltage transient events.

For the A1120, a south pole of sufficient strength turns the

output on. Removal of the magnetic field turns the output off.

The A1125 is complementary to the A1120 in that, for the

A1125, a south pole turns the output off, and removal of the

magnetic field turns the output on.

Two package styles provide a magnetically optimized package

for most applications. Package type LH is a modified SOT23W,

surface mount package, while UA is a three-lead ultra-mini SIP

for through-hole mounting. Each package type is lead (Pb) free

(suffix, –T), with a 100% matte tin plated leadframe.

Regulator

To All Subcircuits

Current Limit

Control

A1120 and A1125

GND

VOUT

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