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 This classification indicates that the product is obsolete and notice has been given.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: February 1, 2010

Deadline for receipt of LAST TIME BUY orders: July 30, 2010

Our next generation recommended substitutes are:

• For the A3282ELHLT-T, we recommend the .
• For the A3282LLHLT-T, we recommend the .
• For the A3282LUA-T, we recommend the .

• 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)

The A3282 Hall-effect sensor IC is a temperature stable, stress-resistant latch. Superior high-temperature performance is made possible through an Allegro® patented dynamic offset cancellation that utilizes chopper-stabilization. This method reduces the offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress. The A3282 complements the current Allegro family of chopper-stabilized latching devices.

The A3282 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.

This device requires the presence of both south and north polarity magnetic fields for operation. In the presence of a south polarity field of sufficient strength, the device output latches on, and only switches off when a north polarity field of sufficient strength is present.

The A3282 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 two 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 {bfb} matte tin plated leadframes.

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.