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1MHz Bandwidth, High Accuracy Isolated Current Sensor with Overcurrent fault

The CT431 (CT430 = 5V version and CT431 = 3.3V version) 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.

Fast response with a 1MHz bandwidth and 300ns response time.  High signal-to-noise (SNR) with ultra-low noise of 9mARMS.  Integrated common mode field rejection <5mA/mT to ensure stray fields do not impact measurements in the working application.  The CT430 has an integrated over-current detection (OCD) circuitry to identify out of range currents which is output on the fault pin (FLT).  The FLT is an open drain, active LOW digital signal.

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

Also available in 5.0 V version as CT430.


  • CT430 (5.0 V version), CT431 (3.3V version)
  • Integrated 0.5 mΩ conductor
  • Total error output +/-0.7% (typ)
  • 300 ns response time, 1MHz bandwidth
  • Low noise 9 mARMS
  • Integrated Common Mode Field Rejection (CMFR)
  • Over-Current Detection output pin
  • AC or DC Current Range:
    – +20.0 ADC / ±20.0 APK
    – +30.0 ADC / ±30.0 APK
    – +50.0 ADC / ±50.0 APK
  • 16-lead SOIC-Wide package (10.20 x 10.31 x 2.54 mm)





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