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Related Links:

Datasheets:
A3340: Chopper-Stabilized, Precision Hall-Effect Switch (PDF)

Selection Guides:
Hall-Effect Sensors,

Unipolar Hall-Effect Digital Switches

when this product is updated

A3340
Chopper-Stabilized, Precision Hall-Effect Switch

Features

• Resistant to physical stress
• Superior temperature stability
• Output short-circuit protection
• Operation from unregulated supply
• Reverse battery protection
• Solid-state reliability
• Small size

Description

The A3340 Hall effect switch is an extremely temperature-stable and stress-resistant sensor especially suited for operation over extended temperature ranges up to 150°C. Superior high-temperature performance is made possible through dynamic offset cancellation, which reduces the residual offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress.

The device includes on a single silicon chip a voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and a short-circuit protected open-collector output to sink up to 25 mA. A south pole of sufficient strength will turn the output off. An on-board regulator permits operation with supply voltages of 4.2 to 24 volts.

Two package styles provide a magnetically optimized package for most applications. Suffix LH is an SOT23W surface mount package and while suffix UA is a three-lead ultramini SIP for through hole mounting.

The A3340 complements the A3240, which offers the same features, but with the opposite output polarity.

Functional Block Diagram

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
A3340ELHLT-T	3-lead SOT	Yes	view data	-40 °C to  85 °C
A3340EUA-T	3-pin SIP	Yes	view data	-40 °C to  85 °C
A3340LLHLT-T	3-lead SOT	Yes	view data	-40 °C to  150 °C
A3340LUA-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.