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Data Sheet

HIGH SENSITIVITY CMOS HALL-EFFECT LATCH AH921

Jul. 2011 Rev. 1. 2 BCD Semiconductor Manufacturing Limited

General Description

The AH921 is a Hall-effect latch designed in mixed

signal CMOS technology. It is quite suitable for use

in automotive, industrial and consumer applications.

Superior high-temperature performance is made

possible through dynamic offset cancellation, which

reduces the residual offset voltage normally caused

by device over-molding, temperature dependencies,

and thermal stress. The device integrates a voltage

regulator, Hall-voltage generator, small-signal

amplifier, chopper stabilization, schmitt trigger, and

is directly drivable by the output.

An on-board regulator permits operation with supply

voltage from 3.5V to 24V.

The AH921 is available in TO-92S-3 and SOT-23-3

packages, which are optimized for most applications.

Features

• Wide Operating Voltage Range from 3.5 to 24V

• Symmetrical Switch Points

• Chopper-stabilized Amplifier Stage

• Superior Temperature Stability

• Compact Size

• Built-in Pull-up Resistor

• ESD Rating: 3500V (Human Body Model)

Applications

• Brushless DC Motor Commutation

• Brushless DC Fan

• Solid-state Switch

• Revolution Counting

• Speed Detection

• High Sensitivity and Unconnected Switch

Figure 1. Package Types of AH921

TO-92S-3 SOT-23-3

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