High-speed common-mode EMI filter offers integrated ESD protection

October 2, 2025

Issue 7 2025

The ECMF4-40A100N10 from STMicroelectronics provides highly effective noise suppression for high-speed interfaces such as USB Type-C® ports. The integration of ESD protection helps to save board space and reduce parasitic effects.

STMicroelectronics has introduced the ECMF4-40A100N10 integrated common-mode filter to enable the suppression of EMI or RF interference on high-speed differential serial buses.

High-speed interface technologies for which this filter can provide protection include:

  • HDMI v2.1 and earlier
  • USB4
  • USB 3.x
  • USB 2.0
  • Ethernet
  • MIPI
  • DisplayPort

By integrating noise suppression and ESD protection functions into a single device, the ECMF4-40A100N10 helps designers to keep the effect of parasitic capacitance and inductance to a minimum.

 

The filter can protect and filter one or two differential lanes. It is supplied in a compact 10-lead QFN package measuring 1.4 mm x 2.2 mm x 0.5 mm.

Features

  • 10.7 GHz differential bandwidth
  • 3.0 Ω serial resistance
  • High common-mode attenuation at WLAN frequencies:
    • -15 dB at 2.4 GHz
    • -21 dB at 5.0 GHz
    • -17 dB at 6.0 GHz
  • Exceeds requirements of IEC 61000-4-2 level 4 standard for ESD:
    • Withstands ±10 kV contact discharge
    • Withstands ±25 kV air discharge

Applications

  • Notebook computers
  • Tablet computers
  • Laptop computers
  • Media streaming boxes
  • HDMI streaming sticks
  • Games consoles
  • Set-top boxes
  • Portable electronics devices
Extra_FTMIssue72025_ST_ECMF4_40A100N10

Evaluation Kit

Part Number: STEVAL-OET005Vx

STEVAL-OET005 kits provides a hardware platform for evaluating the ECMF4-40A100N10 and other STMicroelectronics ESD protection or filtering devices for USB Type-C® connectors.

 

The STEVAL-OET005VC kit provides a protection solution for all lines of data, control, and power. This kit contains the STEVAL-OET005C evaluation board and the STEVAL-OET005E testing board.

 

The STEVAL-OET005VD kit provides a protection and filtering solution for all lines. This kit contains the STEVAL-OET005D evaluation board and the STEVAL-OET005E testing board.

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