Digital TMR Latch

Data Sheet

  • CT811x Data Sheet (Unipolar)
  • CT812x Data Sheet (Bipolar)
  • CT813x Data Sheet (Omnipolar)

Application Notes

Samples & Evaluation Boards

CT81xx: Ultra-low Power Digital TMR Latch Sensor

The CT81xx is a product family of omnipolar, bipolar and unipolar Tunnel Magneto-resistance (TMR) digital latches that are designed for consumer and industrial applications. They are based on Crocus Technology’s patented Magnetic Logic Unit™ (MLU™) technology with integrated CMOS process to provide a monolithic solution for superior sensing performance. The CT81xx digital latches with XtremeSense™ performance offer stable magnetic operation over the operating temperature range.

For applications that require a very small form factor and low profile, the CT81xx latches are assembled in a 4-lead LGA package. It is also available in an industry standard package 3-lead SOT-23 to support high volume manufacturing for industrial markets.


  • Sensitivity with BOP Range: 1.0 mT to 7.0 mT
  • Ultra-low Power Consumption: ~110 nA @ VDD = 1.8 V and fS = 2 Hz
  • Supply Voltage Range: 1.7 V to 5.5 V
  • Sensor Polarity:
    • Omnipolar
    • Bipolar
    • Unipolar
  • Digital CMOS Outputs:
    • Push-pull
    • Open Drain
  • Under-Voltage Lockout (UVLO)
  • Package Options:
    • 3-Lead SOT23
    • 4-lead LGA, 1.45 x 1.45 x 0.44 mm


  • IoT Devices
  • Smartphones, Tablets and Laptops
  • Battery-operated Electronic Devices
  • Wearable Consumer Electronics
  • Door or Lid Closure
  • Reed Switch Replacement
  • Tamper-proofing for Utility Smart Meters
  • Fluid Level Sensing/Detection
  • Proximity Detection
  • Motor Controllers
  • Industrial Machinery/Robots
  • Medical Devices

Crocus Technology: Intelligence in Sensing™