A1250LLHLX-T

A1250LLHLX-T Datasheet

A1250

Part	Datasheet
A1250LLHLX-T	A1250LLHLX-T (pdf)

Related Parts	Information
A1250LUA-T	A1250LUA-T

PDF Datasheet Preview
A1250 Hall-Effect Latch / Bipolar Switch • AEC-Q100 automotive qualified • High-speed, 4-phase chopper stabilization • Low operating voltage down to 3 V • High sensitivity • Stable switchpoints • Robust EMC Packages: 3-Pin SOT23W suffix LH 3-Pin SIP suffix UA Not to scale V+ VCC Regulator The A1250 Hall-effect sensor IC is a temperature-stable, stress-resistant bipolar switch. This device is the most sensitive Hall-effect device in the Allegro bipolar switch family and is intended for ring-magnet sensing. Superior high-temperature performance is made possible through an Allegro patented dynamic offset cancellation that utilizes chopper stabilization. This method reduces the offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress. The A1250 includes the following on a single silicon chip a voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and a shortcircuit-protected open-drain output. Advanced BiCMOS wafer fabrication processing takes advantage of low-voltage requirements, component matching, very low input-offset errors, and small component geometries. The A1250 Hall-effect bipolar switch turns on in a south polarity magnetic field of sufficient strength and switches off in a north polarity magnetic field of sufficient strength. Because the output state is not defined if the magnetic field is diminished or removed, to ensure that the device switches, Allegro recommends using magnets of both polarities and of sufficient strength in the application. The A1250 is rated for operation in the ambient temperature Continued on the next To All Subcircuits Dynamic Offset Cancellation Sample and Hold Clock / Logic Amp Low-Pass Filter Control Current Limit Functional Block Diagram VOUT A1250 Hall-Effect Latch / Bipolar Switch Description continued range L, to 150°C. Two package styles provide magnetically optimized solutions for most applications. Each package is lead Pb free version, with 100% matte-tin-plated leadframe. SPECIFICATIONS Selection Guide Packing* A1250LLHLT-T 7-in. reel, 3000 pieces/reel A1250LLHLX-T 13-in. reel, 10 000 pieces/reel A1250LUA-T Bulk, 500 pieces/bag *Contact Allegro for additional packing options. Mounting Surface mount Surface mount SIP through hole Ambient, TA °C to 150 Absolute Maximum Ratings Symbol VCC VRCC VOUT

PDF Datasheet Preview

A1250

Hall-Effect Latch / Bipolar Switch
• AEC-Q100 automotive qualified
• High-speed, 4-phase chopper stabilization
• Low operating voltage down to 3 V
• High sensitivity
• Stable switchpoints
• Robust EMC

Packages:
3-Pin SOT23W suffix LH
3-Pin SIP suffix UA

Not to scale

V+ VCC

Regulator

The A1250 Hall-effect sensor IC is a temperature-stable, stress-resistant bipolar switch. This device is the most sensitive Hall-effect device in the Allegro bipolar switch family and is intended for ring-magnet sensing. Superior high-temperature performance is made possible through an Allegro patented dynamic offset cancellation that utilizes chopper stabilization. This method reduces the offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress.

The A1250 includes the following on a single silicon chip a voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and a shortcircuit-protected open-drain output. Advanced BiCMOS wafer fabrication processing takes advantage of low-voltage requirements, component matching, very low input-offset errors, and small component geometries.

The A1250 Hall-effect bipolar switch turns on in a south polarity magnetic field of sufficient strength and switches off in a north polarity magnetic field of sufficient strength. Because the output state is not defined if the magnetic field is diminished or removed, to ensure that the device switches, Allegro recommends using magnets of both polarities and of sufficient strength in the application.

The A1250 is rated for operation in the ambient temperature

Continued on the next

To All Subcircuits

Dynamic Offset Cancellation

Sample and Hold

Clock / Logic Amp

Low-Pass Filter

Control

Current Limit

Functional Block Diagram

VOUT

A1250

Hall-Effect Latch / Bipolar Switch

Description continued
range L, to 150°C. Two package styles provide magnetically optimized solutions for most applications. Each package is lead Pb free version, with 100% matte-tin-plated leadframe.

SPECIFICATIONS

Selection Guide

Packing*

A1250LLHLT-T 7-in. reel, 3000 pieces/reel

A1250LLHLX-T 13-in. reel, 10 000 pieces/reel

A1250LUA-T

Bulk, 500 pieces/bag
*Contact Allegro for additional packing options.

Mounting

Surface mount Surface mount SIP through hole

Ambient, TA °C
to 150

Absolute Maximum Ratings

Symbol VCC VRCC VOUT

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived A1250LLHLX-T Datasheet file may be downloaded here without warranties.

Datasheet ID: A1250LLHLX-T 516004