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Related Links:

Datasheets:
A3230: Chopper-Stabilized Hall-Effect Bipolar Switch (PDF)

Selection Guides:
Hall-Effect Sensors,

Bipolar Hall-Effect Digital Switches

when this product is updated

A3230
Chopper-Stabilized Hall-Effect Bipolar Switch

Features

• Chopper stabilization
  • Superior temperature stability
  • Extremely low switchpoint drift
  • Insensitive to physical stress
• Reverse battery protection
• Output short circuit protection
• Solid state reliability
• Small size
• Robust EMC capability
• High ESD ratings (HBM)

Description

The A3230 Hall-effect sensor is a temperature stable, stress-resistant bipolar switch. This sensor 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 A3230 includes the following 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. Advanced BiCMOS wafer fabrication processing takes advantage of low-voltage requirements, component matching, very low input-offset errors, and small component geometries.

The A3230 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 A3230 is rated for operation between the ambient temperatures –40°C and 85°C for the E temperature range, and –40°C to 150°C for the L temperature range. Two A3230 package styles provide magnetically optimized solutions for most applications. Package LH is a SOT23W, a miniature low-profile surface-mount package, while package UA is a three-lead ultramini SIP for through-hole mounting. Each package is available in a lead (Pb) free version, with 100% matte tin plated leadframes.

Functional Block Diagram

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
A3230ELHLT-T	3-lead SOT	Yes	view data	-40 °C to  85 °C
A3230EUA-T	3-pin SIP	Yes	view data	-40 °C to  85 °C
A3230LLHLT-T	3-lead SOT	Yes	view data	-40 °C to  150 °C
A3230LUA-T	3-pin SIP	Yes	view data	-40 °C to  150 °C

Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.