Tuesday, February 25, 2025

SMD Chokes for High-Current Applications

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Looking for a high-current solution with easy integration and noise suppression? Find out how this new SMD choke series could improve your designs.

TDK launches SurfIND, SMD common-mode chokes for rated currents of up to 36 A at high temperatures
TDK launches SurfIND, SMD common-mode chokes for rated currents of up to 36 A at high temperatures

TDK Corporation has introduced the EPCOS SurfIND series, a new line of current-compensated ring core double chokes designed for high currents and surface mounting. The series provides an SMD solution for customers who require high-current common-mode chokes but prefer reflow soldering, such as those used in telecom equipment and industrial drives. Main applications include suppressing common-mode interferences, switch mode power conversion, and frequency-variable drives.

The company claims that the chokes filter common-mode noise for rated currents from 24 A to 36 A at +70 °C, with the potential for higher currents when additional cooling is applied. The top side of the component allows direct heat sink attachment for efficient thermal management.

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Designed for applications up to 250 V (AC), the series includes seven variants with nominal inductance values between 120 µH and 820 µH. With stray inductance up to 1% of the nominal value, these chokes also reduce differential-mode noise. All models comply with IEC/EN 60938-2 standards and share a 40 x 38 mm (L x W) footprint, with heights of 20.7 mm for A types and 22.3 mm for B types. Typical resistance ranges from 0.78 mΩ to 2.21 mΩ, and inductance remains within 10% of the nominal value at rated current with DC magnetic bias at +20 °C.

Some of the key features of the EPCOS SurfIND series include:

  • High-rated currents at high temperature
  • Low profile with defined height dimension
  • Self-leaded SMD terminals suitable for reflow soldering
  • Ferrite core with epoxy coating and plastic base plate (UL 94 V-0)
  • Approx. 0.6 to 1% stray inductance for differential-mode noise suppression

Each SurfIND choke is mounted on a plastic baseplate with a ferrite core coated in epoxy for insulation. Both materials meet UL 94 V0 standards. The design eliminates the need for adhesives, and self-leading SMD leads simplify reflow soldering to PCBs.

Nidhi Agarwal
Nidhi Agarwal
Nidhi Agarwal is a Senior Technology Journalist at EFY with a deep interest in embedded systems, development boards and IoT cloud solutions.

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