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A3340: Chopper-Stabilized, Precision Hall-Effect Switch (PDF)
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Hall-Effect Sensor ICs,
Unipolar Hall-Effect Digital Switches
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A3340
Chopper-Stabilized, Precision Hall-Effect Switch
A3340EUA-T and A3340LUA-T variants are in production but have been determined to be LAST TIME BUY. This classification indicates that the variants are obsolete and notice has been given. Sale of the variants is currently restricted to existing customer applications. The variants should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available.
Status date change: May 3, 2010.
Deadline for receipt of LAST TIME BUY orders is October 29, 2010.
Recommended substitution: for the A3340EUA-T, refer to the A1125EUA-T, and for the A3340LUA-T, refer to the A1125LUA-T.
For existing customer transition, and for new customers or new applications, refer to the A1125.
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 IC 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
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| A3340EUA-T | 3-pin SIP | Yes | view data | -40 °C to 85 °C | last-time buy |
Contact Local Sales Representative or check distributor stock |
|
| A3340LUA-T | 3-pin SIP | Yes | view data | -40 °C to 150 °C | last-time buy |
Contact Local Sales Representative or check distributor stock |
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.