A1245 Chopper-Stabilized, Two Wire Hall-Effect Latch

Oct. 26, 2015

A1245 latch, produced through the advanced BiCMOS wafer fabrication process, implements high frequency, 4-phase, chopper-stabilization techniques to achieve magnetic stability over the full operating temperature range of -40 to 150ºC. A Hall-effect latch will be in the high output current state in the presence of a magnetic south polarity field of sufficient magnitude and will remain in this state until a sufficient north polarity field is present.


Designed for speed and position sensing of ring magnets or other moving/rotating assemblies, they can be used in applications that are safety-critical and/or have long wiring harnesses. Examples include automotive applications such as internal mode switch (IMS) transmissions and transmission range switch (TRS)/manual level position sensor (MLPS) shift selectors; electronic parking brake motors; electronic power steering (EPS); and sunroof, tailgate, and other motors; industrial/consumer applications include white goods, industrial/factory automation, and automatic doors.

  • High-speed, 4-phase chopper stabilization
  • Low switch point drift throughout the temperature range
  • Low sensitivity to thermal and mechanical stresses
  • On-chip protection
  • Supply transient protection
  • Reverse battery protection
  • On-board voltage regulator: 3 to 24V operation
  • Operation up to 175°C junction temperature
  • Solid-state reliability
  • ISO 7637-2 performance through proprietary 40V clamping structures