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PL7401 (WT7761)  


The PL7401 is an accurate fault tolerant electrical energy measurement IC intended for use in two-wire distribution systems. This approach provides superior stability and accuracy over extremes in environmental conditions and over time.

The PL7401 incorporates a fault detection scheme, which both warns of fault conditions and allows the PL7401 to continue accurate billing during a fault event. The Fault condition is detected by continuously monitoring both the phase and neutral (return) currents. A fault is indicated when these currents differ by more than 6.25%, and billing is continued using the larger of the two currents. Gain calibration between channels is adjusted external to this device

The PL7401 includes a power supply monitoring circuit on the VDD supply pin. Internal phase-matching circuitry ensures that the voltage and current channels are matched..


  • Supports IEC 687/61036 International Energy Metering Specification a
  • Four 16-bit, delta sigma Analog-to-Digital Converters(ADCs), Less than 0.1% Error over a Dynamic Range of 500 to 1
  • Supplies Average Real Power Measurement for Single-Phase on the Frequency Outputs F1 and F2
  • The Calibration and Instantaneous Real Power Can be Monitored through The High-Frequency Output CF
  • Continuous monitoring of the phase and neutral current allows fault detection in 2-wire distribution systems
  • Current channels input level best suited for current transformer sensors
  • Uses the larger of the two currents (phase or neutral) to bill—even during a fault condition
  • Continuous monitoring of the voltage and current inputs allows missing neutral detection
  • Uses one current input (phase or neutral) to bill when missing neutral is detected
  • Two Logic Outputs (FAULT and REVP) Can Be Used to Indicate a Potential Miswiring or Fault Condition
  • Direct Drive for Two Phase Stepper Motors and Electromechanical Counters
  • On-Chip Reference 2.5 V (30 ppm/℃Typical)


  • 1P2W/1P3W KWH Meter with anti-Tamper feature.


  • SSOP-20
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