TDK Expands EMI Filter Portfolio with 1250 V DC Chokes

Why It Matters

The new chokes enable designers of next‑generation high‑voltage power systems to achieve tighter EMI suppression while saving PCB real estate, accelerating adoption of wide‑bandgap technologies.

Key Takeaways

• B82722V6*B040 chokes support up to 1250 V DC (630 V AC).
• Inductance options range 3.3 mH to 22 mH, currents 0.85‑3 A.
• Size 23 × 15.5 × 24 mm fits space‑constrained PCB designs.
• Multilayer solid insulation tested at 3,750 V line‑to‑line for safety.
• Meets UL 94 V‑0, IEC 60938‑2, IEC/UL 60939‑3, and RoHS standards.

Pulse Analysis

TDK’s addition of the B82722V6*B040 high‑voltage common‑mode chokes reflects the industry’s shift toward higher DC‑link voltages driven by SiC and GaN power devices. As converters operate at faster switching speeds, electromagnetic interference becomes a critical design hurdle. By offering a component that tolerates 1250 V DC while maintaining a compact footprint, TDK addresses the dual demand for performance and space efficiency in modern power electronics.

The B82722V6*B040 series distinguishes itself with a multilayer solid insulation architecture validated at 3,750 V line‑to‑line, ensuring robust isolation for demanding applications. Its inductance range of 3.3 mH to 22 mH and current ratings up to 3 A provide flexibility for designers tailoring EMI filters to specific power‑train requirements. The automated winding process yields low stray inductance—approximately 0.6%—which helps suppress both common‑mode and symmetrical noise components. Compliance with UL 94 V‑0, IEC 60938‑2, IEC/UL 60939‑3 and RoHS further simplifies certification and environmental compliance.

For manufacturers of industrial motor drives, switch‑mode power supplies, and other high‑voltage converters, the new chokes enable tighter board layouts without sacrificing safety or filtering effectiveness. This can translate into reduced material costs and faster time‑to‑market for products leveraging wide‑bandgap semiconductors. TDK’s move reinforces its position as a key supplier of passive components in the evolving power‑electronics ecosystem, where compact, high‑performance EMI solutions are increasingly essential.