Littelfuse TMR Switches

Littelfuse TMR Switches are digital magnetic switches that integrate tunneling magnetoresistance (TMR) and CMOS technology. This technology provides a magnetically triggered digital switch with high sensitivity, and ultralow power consumption. This Littelfuse series contains a TMR magnetic sensor and CMOS signal processing circuitry within the same package. An on-chip TMR voltage generator is also included for precise magnetic sensing. A TMR voltage amplifier and comparator plus a Schmitt trigger provide switching hysteresis for noise rejection.


  • 5, 7, 10, 14, or 17 Gauss BOP
  • Ultra-Low Power Consumption: 200nA at 50 Hz response or 1.5 uA at 1 kHz response
  • X-axis or Z-axis sensing directions available
  • Unipolar, omnipolar, or bipolar (latching) operating modes
  • Excellent thermal stability
  • Open drain or push-pull output available
  • SOT23-3 package


  • Proximity switches
  • Utility meters, including gas, water, and heat meters
  • Position and speed sensing
  • Motor and fan control
  • Solid state switches
Published: 2019-12-16 | Updated: 2023-06-05