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TDK EP21 Flat-Wire Common-Mode Chokes

TDK EP21 Flat-Wire Common-Mode Chokes are flat-wire double chokes designed for common-mode electromagnetic interference (EMI) filtering. These TDK surface-mount (SMD) chokes feature dimensions of 23.8mm length x 17.7mm width and heights of 21.6mm to 22.3mm. The EP21 series also features space-saving underbody termination and a four-pin design for enhanced mechanical reliability. These flat-wire double chokes can handle rated voltages of 48VAC or 80VDC and rated currents of 20.3A to 35A without derating up to +70°C. The TDK EP21 can be used as common-mode chokes for applications such as DC-DC converters or other low-voltage electromagnetic compatibility (EMC) protection circuits.

Features

  • High rated currents
  • High rated inductance
  • Low DC resistance
  • MnZn ferrite
  • Flat-wire winding
  • Surface-mount technology
  • Compact size due to underbody termination

Applications

  • Common-mode chokes in DC-DC converters
  • Low-voltage EMC protection

Specifications

  • 20.3A to 35A rated curret
  • 160μH to 640μH nominal inductance
  • 48VAC (50Hz/60Hz)/80VDC rated voltage
  • 200VDC (line/line) test voltage
  • +70°C rated temperature
  • 23.8mm length x 17.7mm width x 21.6mm to 22.3 mm height

Circuit Diagram

Application Circuit Diagram - TDK EP21 Flat-Wire Common-Mode Chokes

Dimensions

Mechanical Drawing - TDK EP21 Flat-Wire Common-Mode Chokes
Published: 2026-07-23 | Updated: 2026-07-23