SMD wire-wound common-mode chokes for power lines must handle higher current, minimize losses, and maintain stable impedance across low to mid frequencies. The SMM series uses MnZn or custom ferrite cores with optimized winding structures to achieve: • High inductance for low-frequency noise • Low DCR for reduced heat generation • High Saturation Current capability • Strong thermal performance for continuous current applications. Coilmaster also offers matching SMD and through-hole CMC solutions for high-speed data lines, signal lines, and high-power converters.

How to Choose a High Current Common Mode Choke

Several factors should be considered when selecting a high-current SMD common-mode choke: Impedance Value – Higher impedance increases noise attenuation but narrows the effective frequency range. Typical measurements are done at 100 MHz; select based on required suppression band. Frequency Range – NiZn cores work better at high frequencies; MnZn cores deliver higher inductance for low-frequency filtering (<1 MHz). Package Size & DCR – Larger packages typically support higher current and lower DCR. Select based on thermal performance and available PCB area.

Key Advantages of T-Core Power CMC

Characteristic

High current capability
Ultra-low DCR design
MnZn & NiZn ferrite options
T-core construction
Wide operating frequency range 40°C to +125°C operation

Features

• Effective power-line EMI suppression
• Supports AC-DC & DC-DC converter filtering
• Low DCR and excellent thermal stability
• SMD compact size for space-limited designs
• Stable impedance at low to mid frequencies

Applications

• Power supply circuits (AC-DC / DC-DC)
• Adapters, chargers, battery management units (BMS)
• Automotive ECUs and onboard power networks
• Industrial controllers, inverters, motor drivers
• General EMI suppression for high-current rails