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Datasheets:
A3240: Chopper-Stabilized Precision Hall-Effect Switch (PDF)
Selection Guides:
Hall-Effect Sensor ICs,
Unipolar Hall-Effect Digital Switches
Technical Publications:
Chopper-Stabilized Amplifiers With a Track-and-Hold Signal Demodulator,
Unipolar Hall-Effect Sensor IC Basics,
Monolithic Magnetic Hall Sensor ICs Using Dynamic Quadrature Offset Cancellation
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A3240
Chopper-Stabilized Precision Hall-Effect Switch
These parts are in production but have been determined to be LAST TIME BUY. This classification indicates that the product is obsolete and notice has been given. Sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available.
Date of status change: November 2, 2009
Deadline for receipt of LAST TIME BUY orders: April 30, 2010
Recommended Substitutions:
- for A3240ELHLT-T use A1120ELHLX-T
- for A3240ELTTR-T contact Allegro Sales
- for A3240EUA-T use A1120EUA-T
- for A3240LLHLT-T use A1120LLHLX-T
- for A3240LLTTR-T contact Allegro Sales
- for A3240LUA-T use A1120LUA-T
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 A3240 Hall-effect switch is an extremely temperature-stable and stress-resistant sensor IC especially suited for operation over extended temperature ranges 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 on. An on-board regulator permits operation with supply voltages of 4.2 to 24 volts.
Three package styles provide a magnetically optimized package for most applications. Package type LH is a modified SOT23W surface-mount package, LT is a miniature SOT89/TO-243AA transistor package for surface-mount applications; while UA is a three-lead ultra-mini-SIP for through-hole mounting. The LH and UA packages are also available in a lead (Pb) free version (suffix, –T), with a 100% matte tin plated leadframe.
Functional Block Diagram
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| A3240ELHLT-T | 3-lead SOT | Yes | view data | -40 °C to 85 °C | not for new design |
Contact Local Sales Representative or check distributor stock |
|
| A3240ELT-T | 3-lead SOT | Yes | view data | -40 °C to 85 °C | last-time buy |
Contact Local Sales Representative or check distributor stock |
|
| A3240ELTTR-T | 3-lead SOT | Yes | view data | -40 °C to 85 °C | not for new design |
Contact Local Sales Representative or check distributor stock |
|
| A3240EUA-T | 3-pin SIP | Yes | view data | -40 °C to 85 °C | not for new design |
Contact Local Sales Representative or check distributor stock |
|
| A3240LLHLT-T | 3-lead SOT | Yes | view data | -40 °C to 150 °C | not for new design |
Contact Local Sales Representative or check distributor stock |
|
| A3240LLTTR-T | 3-lead SOT | Yes | view data | -40 °C to 150 °C | not for new design |
Contact Local Sales Representative or check distributor stock |
|
| A3240LUA-T | 3-pin SIP | Yes | view data | -40 °C to 150 °C | not for new design |
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.