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High-Performance Power ICs and Hall-Effect Sensors
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Datasheets:
A3245: Chopper-Stabilized Omnipolar Hall-Effect Switches (PDF)
Selection Guides:
Hall-Effect Sensors,
Omnipolar Hall-Effect Digital Switches
Press Releases:
A3245: Allegro MicroSystems, Inc. Introduces World's First Omnipolar Hall-Effect Sensor Suited for 3.6 V TO 24 V
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A3245
Chopper-Stabilized Omnipolar Hall-Effect Switches
Features and Benefits
- Omnipolar operation
- 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 A3245 integrated circuit is an omnipolar, ultrasensitive Hall-effect switch with a digital output. This sensor has an integrated regulator permitting operation to 24 V, making it the first omnipolar switch available for operation to 24 V. This device is especially 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 A3245 Hall-effect switch includes 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 omnipolar operation of the A3245 allows activation with either a north or a south polarity field of sufficient strength. In the absence of a magnetic field, the output is off. This patented magnetic-polarity-independence feature makes this device an excellent replacement for reed switches, with improved ease of manufacturing, because the A3245 does not require manufacturers to orient their magnets. These devices allow simple on/off switching in industrial, consumer, and automotive applications.
The A3245 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. 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 |
|---|---|---|---|---|---|---|---|
| A3245ELHLT | 3-lead SOT | No | view data | -40 °C to 85 °C | discontinued | Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor. | |
| A3245ELHLT-T | 3-lead SOT | Yes | view data | -40 °C to 85 °C | Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor. | ||
| A3245EUA | 3-pin SIP | No | view data | -40 °C to 85 °C | discontinued | Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor. | |
| A3245EUA-T | 3-pin SIP | Yes | view data | -40 °C to 85 °C | Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor. | ||
| A3245LLHLT | 3-lead SOT | No | view data | -40 °C to 150 °C | discontinued | Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor. | |
| A3245LLHLT-T | 3-lead SOT | Yes | view data | -40 °C to 150 °C | Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor. | ||
| A3245LUA | 3-pin SIP | No | view data | -40 °C to 150 °C | discontinued | Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor. | |
| A3245LUA-T | 3-pin SIP | Yes | view data | -40 °C to 150 °C | Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor. |
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.