April 2010

Inductors

Thin-film common-mode filter with integrated ESD suppression

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TDK-EPC, a group company of the TDK Corporation, introduces the world’s first* thin-film common-mode filter (TCE1210) with both high-speed differential-transmission common-mode noise suppression and ESD protection in a single component. Mass production is scheduled to begin in April 2010.

The new filter is the same size as existing TDK common-mode filters (1.25 × 1.00 × 0.60 mm³), but using the proprietary thin-film circuit formation and materials technologies, TDK successfully added an ESD suppressor function to the EMI function already present in the internal structure of existing filters. As a result, an additional varistor for ESD suppression is no longer needed. For manufacturers this means a reduction in the number of components and their mounting area, thus contributing to the further miniaturization of mobile devices.

The new filter’s cutoff frequency is 5.0 GHz, the common-mode impedance is 90 Ω ±25 Ω, rated current is 100 mA, and ESD immunity complies with the IEC 61000-4-2 international surge standards. In addition, the filter’s low parasitic capacitance has nearly no effect on the impedance characteristic (TDR measurement), making this filter perfect for use with high-speed, high-volume interfaces such as HDMI, USB 3.0, and SATA in consumer electronics applications.

*As of April 2010, according to TDK investigations.

Glossary

  • EMI: Electromagnetic interference. Refers to interference caused by electromagnetic radiation mainly from electronic devices. EMI suppression is a type of EMC (electromagnetic compatibility) measure.

  • ESD: Electrostatic discharge. Surges caused by static electricity can harm semiconductor components and cause electronic devices to malfunction.
  • ESD suppressor: A type of electrostatic discharge protection device that prevents damage to and malfunction of circuits caused by static electricity.
  • IEC: International Electrotechnical Commission. An international organization established in 1906 that coordinates the standards of various countries in the electrical, electronics, communications, and other fields.
  • TDR: Time-domain reflectometry.

Main applications

  • Noise and electrostatic suppression for high-speed differential transmission in general consumer electronics products such as mobile devices.

Main features and benefits

  • A single component can provide common-mode noise and electrostatic suppression. The number of components and mounting area can be reduced.

Key data

TypeTCE1210-900-2P-T000
common-mode impedance90 Ω ±25 Ω
Cutoff frequency5.0 GHz
Rated voltage (max.)10 V
Rated current100 mA
Dimensions 1.25 × 1.00 × 0.60 mm³

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