CT431 XtremeSense® TMR Sensor

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Ultra-Low Noise, <1% Total
Error Current Sensor

The CT431 is a high bandwidth and ultra-low noise integrated contact current sensor that uses Crocus Technology’s patented XtremeSense® TMR technology to enable high accuracy current measurements for many consumer, enterprise, and industrial applications. It supports six (6) current ranges where the integrated current carrying conductor (CCC) will handle up to 50 A of current and generates a current measurement as a linear analog output voltage. It achieves a total output error of less than 1.0% full-scale (FS) over voltage and the full temperature range.

It has less than 1.0 µs output response time while the current consumption is about 6.0 mA and is immune to common mode fields. The CT431 has an integrated over-current detection (OCD) circuitry to identify out of range currents (OCD) with the result outputted to the fault-bar (FLT) pin. The FLT is an open drain, active LOW digital signal that is activated by the CT431 to alert the microcontroller that a fault condition has occurred.

The CT431 is offered in an industry standard 16-lead SOIC-Wide package that is “green” and RoHS compliant.


  • Integrated Contact Current Sensing for Low to Medium Current Ranges:
    0 A to +20 A
    -20 A to +20 A
    0 A to +30 A
    -30 A to +30 A
    0 A to +50 A
    -50 A to +50 A
  • Integrated Current Carrying Conductor (CCC)
  • Linear Analog Output Voltage
  • Total Error Output ≥ ±1.0% FS, -40°C to +125°C
  • 1 MHz Bandwidth
  • Response Time < 1.0 µs
  • Reference Voltage Output for AC/DC Current Measurements
  • VOUT – VREF < 1.0% (Typical)
  • Low Noise Performance
    – Immunity to Common Mode Fields: < 0.5 mA/G
    – Over-Current Detection (OCD™)
  • Out of Range Currents
    – 16-Lead SOIC-Wide Package


  • CT431 Data Sheet



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