Sumida Introduces DC Common-Mode Chokes Rated Up to 16 A for Automotive Power Electronics
The new components feature AEC-Q200 provisional compliance and operate in temperatures up to 150 degrees Celsius.
Sumida has launched two new surface-mount DC common-mode chokes, the CNFC6D33 and CNFC11D57, designed to suppress electromagnetic interference on DC power lines within automotive power electronics.
What Happened
The CNFC6D33 measures 7.2 × 6.2 × 3.5 mm and is rated for currents of 1.5 A and 4 A. It offers a minimum common-mode impedance of 500 Ω to 1,970 Ω at 100 MHz, with typical impedance reaching 2,500 Ω. Its DC resistance is as low as 15 mΩ maximum. The larger CNFC11D57 measures 12.3 × 11.3 × 6.0 mm and supports currents of 10 A and 16 A. It comes in three configurations with minimum common-mode impedance ranging from 240 Ω to 1,000 Ω at 100 MHz, and features a DC resistance as low as 3 mΩ maximum.
Both components are rated for operation from -40° C to +150° C, including self-heating, and have passed an 80 V Hi-Pot test voltage. Sumida states that these parts are RoHS-listed and have provisional AEC-Q200 compliance. The company’s August announcement indicated that the chokes were in pilot production, and they are now available through Sumida’s global distribution network, with custom winding options for OEMs.
Why It Matters
As electric vehicles incorporate more power electronics, managing high-frequency electrical noise becomes critical for system stability. Sumida’s Vice President of Sales, Carl G. LeJambre III, noted that switching converters, inverters, and onboard chargers generate common-mode currents that can interfere with other electronic systems if not controlled. These chokes target applications including traction inverters, onboard chargers, automotive powertrain systems, and HVAC components like electric compressors and PTC heaters. By offering high-current ratings and compact form factors, these components address the space and thermal constraints inherent in modern EV architectures.
The Bottom Line
Sumida’s new CNFC6D33 and CNFC11D57 chokes provide automotive-grade EMI suppression for DC power lines, featuring provisional AEC-Q200 compliance and current ratings up to 16 A. The components are currently available through global distribution channels.
