A1148LLHLT-T

A1148LLHLT-T Datasheet


A1147 and A1148

Part Datasheet
A1148LLHLT-T A1148LLHLT-T A1148LLHLT-T (pdf)
Related Parts Information
A1147ELHLT A1147ELHLT A1147ELHLT
A1147ELHLT-T A1147ELHLT-T A1147ELHLT-T
A1147LUA-T A1147LUA-T A1147LUA-T
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A1147LLHLT-T A1147LLHLT-T A1147LLHLT-T
A1147LLHLT A1147LLHLT A1147LLHLT
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A1148LLHLT A1148LLHLT A1148LLHLT
A1148LUA-T A1148LUA-T A1148LUA-T
A1148EUA-T A1148EUA-T A1148EUA-T
A1148LUA A1148LUA A1148LUA
A1148ELHLT-T A1148ELHLT-T A1148ELHLT-T
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A1147 and A1148

Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches

Chopper stabilization Low switchpoint drift over operating temperature range Low sensitivity to stress

Factory programmed at end-of-line for optimized switchpoints

Packages 3 pin SOT23W suffix LH , and 3 pin SIP suffix UA

The A1147 and A1148 devices are two-wire, unipolar, Hall effect switches that are factory-programmed at end-of-line to optimize ultrasensitive 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 in sensing seat track position, seat belt buckle presence, hood/trunk latching, and shift selector position. Two-wire unipolar switches, such as the A1147 and A1148, 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. These devices also

Not to scale

V+ VCC

Dynamic Offset Cancellation

Sample and Hold

Continued on the next

Functional Block Diagram

Clock/Logic Amp

Regulator To All Subcircuits

Low-Pass Filter

GND Package UA Only

A1147 and A1148

Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches

Description continued feature on-chip transient protection and a Zener clamp to protect against overvoltage conditions on the supply line.

The output currents of the A1148 switches HIGH in the presence of a south + polarity magnetic field of sufficient strength, and switches LOW otherwise, as in the presence of a weak field or a north polarity field. The A1147 has an opposite output the currents switch LOW in the presence of a south-polarity magnetic
field of sufficient strength, and switch HIGH otherwise.

Both versions are offered in two package styles. The LH is a SOT23W, 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, with 100% matte tin plated leadframe. Field-programmable versions also available A1180 and A1181.

Selection Guide

Pb-Free

Packing1

Package

A1147ELHLT-T

Yes Tape and Reel, 3000 pieces/reel

A1147EUA-T

Yes Bulk Bag, 500 pieces/bag

A1147LLHLT-T

Yes Tape and Reel, 3000 pieces/reel

A1147LUA-T

Yes Bulk Bag, 500 pieces/bag

A1148ELHLT-T

Yes Tape and Reel, 3000 pieces/reel

A1148EUA-T

Yes Bulk Bag, 500 pieces/bag

A1148LLHLT-T

Yes Tape and Reel, 3000 pieces/reel
More datasheets: A1147LUA | A1147LLHLT-T | A1147LLHLT | A1147EUA-T | A1147EUA | A1148ELHLT | A1148EUA | A1148LLHLT | A1148LUA-T | A1148EUA-T


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Datasheet ID: A1148LLHLT-T 516000