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A1220LLHLT-T

A1220LLHLT-T

Allegro MicroSystems
Digital Switch Latch Open Drain Hall Effect SOT-23W
Active53,473 in stock
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Overview

The A1220LLHLT-T is a high-performance Hall-effect latch from Allegro MicroSystems designed for operation across a wide 3V to 24V supply range. It is AEC-Q100 qualified for automotive use, featuring superior temperature stability and resistance to physical stress for reliable switching in harsh environments. The device provides an open-drain output that responds to magnetic south poles with a 4mT trip point and -4mT release point.

Why Choose This Part

This sensor offers AEC-Q100 automotive qualification and operates reliably at temperatures up to 150 degrees Celsius. It includes integrated reverse-battery protection and output short-circuit protection to prevent damage during installation or system faults. The symmetrical magnetic switch points ensure stable duty cycles in rotational sensing applications.

Applications

Electronic Power Steering (EPS)
Used for sensing rotor position or motor commutation in steering assist systems.
Automotive Power Closures
Detects the position of power windows, sunroofs, and liftgates for limit switching.
Brushless DC Motor Commutation
Provides precise timing feedback for industrial and automotive BLDC motor controllers.
Speed and RPM Sensing
Detects rotating ring magnets in transmissions or industrial shafts to calculate rotational speed.

Key Specifications

Function Latch
Technology Hall Effect
Output Type Open Drain
Polarization South Pole
Mounting Type Surface Mount
Sensing Range 4mT Trip, -4mT Release
Package / Case SOT-23W
Test Condition -40degC ~ 150degC
Voltage - Supply 3V ~ 24V
Operating Temperature -40degC ~ 150degC (TA)
Current - Output (Max) 25mA
Current - Supply (Max) 4mA
Supplier Device Package SOT-23W

Getting Started

To implement the A1220LLHLT-T, connect a pull-up resistor (typically 1k to 10k ohms) between the VOUT pin and the logic supply, as the output is open-drain. Ensure a 0.1uF bypass capacitor is placed close to the VCC and GND pins to filter supply noise. For evaluation, use a multipole ring magnet or a north/south magnetic pair to test the latching behavior.

Also Consider

AH3761-WG-7 DIODiodes Incorporated - A high-sensitivity Hall-effect latch suitable for general-purpose industrial switching and commutation.