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A3241 and A3242: Chopper-Stabilized Unipolar Hall-Effect Switches (PDF)
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Hall-Effect Sensor ICs,
Unipolar Hall-Effect Digital Switches
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A3241 and A3242
Chopper-Stabilized Unipolar Hall-Effect Switches
This device is in production, however, it has been deemed Pre-End of Life. The product is approaching end of life. Within a minimum of 6 months, the device will enter its final, Last Time Buy, order phase. Status change: August 16, 2010. Recommended substitution: A1122.
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 A3241 and A3242 integrated circuits are unipolar Hall-effect switches with digital outputs. These sensor ICs are suited for operation over extended temperature ranges, up to +150°C. Superior high-temperature performance is made possible through an Allegro® patented dynamic offset cancellation, which reduces the residual offset voltage normally caused by device overmolding, temperature excursions, and thermal stress.
The A3241 and A3242 Hall-effect switches include the following on a single silicon chip: 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 is used to take advantage of low-voltage requirements, component matching, very low input-offset errors, and small component geometries.
The integrated voltage regulator permits operation from 3.6 to 24 V. The unipolar family members operate with a sufficient south polarity field only, turning off in the absence of such a south polarity field.
The A3241 and A3242 are 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. The small geometries of the BiCMOS process allow these devices to be provided in ultrasmall packages. The package styles available provide magnetically optimized solutions for most applications. Package LH is an 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
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| A3242LLHLT-T | 3-lead SOT | Yes | view data | -40 °C to 150 °C | pre-eol |
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.