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Crocus Technology CT430/1 High Accuracy Isolated Current Sensor

1 MHz Bandwidth with Overcurrent Fault Detection

The Crocus Technology CT430 (VCC = 5.0 V) or CT431 (VCC = 3.3 V) 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.

The current sensor supports eight (8) current ranges where the integrated current carrying conductor (CCC) will handle up to 65 A of current and generates a current measurement as a linear analog output voltage. The CT430/1 achieves a total output error of less than ±1.0% full-scale (FS) over voltage and the full temperature range.

CT430 and CT431 isolated current sensors feature fast response with a 1 MHz bandwidth and 300ns response time; high signal-to-noise (SNR) with ultra-low noise of 9.0 mARMS for CT430 (9.5 mARMS for CT431).

These Crocus Technology devices include integrated common mode field rejection of -54 dB to ensure stray fields do not impact measurements in the working application. The CT430/1 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 CT430/1 by Crocus Technology is offered in an industry standard 16-lead SOIC-Wide package that is “green” and RoHS compliant.


  • Total Error Output: ±0.5% FS (typ.)
  • 300 ns Response Time, 1 MHz Bandwidth
  • Noise as Low as 9.0 mARMS
  • Integrated 0.5 mΩ Conductor
  • VCC = 5.0 V
  • Immunity to Common Mode Field: -54 dB
  • Rated Isolation Voltage: >5 kVRMS
  • UL/IEC 62387 and UL1577 Certified
  • IEC 61000-4-5 Certified
  • AC or DC Current Range:
    • +20.0 ADC / ±20.0 APK
    • +30.0 ADC / ±30.0 APK
    • +50.0 ADC / ±50.0 APK
    • +65.0 ADC / ±65.0 APK
  • 16-lead SOIC-Wide package (10.20 x 10.31 x 2.54 mm)


  • Solar/Power Inverters
  • UPS, SMPS and Telecom Power
  • Battery Management Systems
  • Smart Appliances
  • Motors & Generators
  • White Goods
  • Battery Management
  • Power Utility Meters
  • Over-Current Fault Protection


CT430 Block Diagram

Crocus Technology — CT430 Functional Block Diagram


CT430 Application Diagram

Crocus Technology — CT430 Application Diagram