• Square Core Single Layer Common Mode Inductors in different dimensions.
• Excellent common mode interference suppression and good differential mode filtering against symmetrical interferences.
• High insulation between windings.
• Best performance/dimensions ratio.
• Custom Common Mode Inductors on request.
• Available as part of a design kit, upon request and subject to availability.

Technical Role of Common Mode Inductors in Power Electronics

Common Mode Inductors are critical components in modern power electronics, particularly for electromagnetic interference (EMI) suppression. Their primary function is to block unwanted high-frequency noise signals that appear simultaneously on multiple lines (common mode), while allowing the desired differential signal to pass with minimal attenuation.

In applications such as switch-mode power supplies (SMPS), DC-DC converters, and industrial inverters, compliance with EMI standards like CISPR and IEC is mandatory. Common Mode Inductors enable manufacturers to meet these stringent requirements without compromising efficiency or increasing circuit complexity.

The SCF Series stands out for its square core single-layer construction, which ensures high reliability, reduced leakage inductance, and optimal heat dissipation. These characteristics translate into a superior performance-to-dimensions ratio, enabling compact designs that meet both electrical and thermal constraints.

Structural Features and Design Advantages

The SCF Series offers:

• Excellent common mode interference suppression, ensuring compliance with international EMI regulations.
• Good differential mode filtering to attenuate symmetrical interferences.
• High insulation between windings, crucial for meeting creepage and clearance safety distances.
• Wide dimensional availability, making the inductors suitable for multiple form factors and PCB layouts.
• Custom engineering options, where winding configuration, inductance values, and current ratings can be tailored to the customer’s design requirements.

Compared to traditional solutions, these Common Mode Inductors reduce the number of external components needed for filtering, minimizing both board space and assembly costs.

Applications of Common Mode Inductors

The use of Common Mode Inductors is widespread in:

• Switch-Mode Power Supplies (SMPS): For reducing conducted EMI on AC and DC lines.
• Industrial Automation: Filtering in motor drives, inverters, and PLC systems.
• Consumer Electronics: Compliance with electromagnetic compatibility requirements in chargers, adapters, and LED drivers.
• Renewable Energy Systems: EMI filtering in photovoltaic inverters and wind turbine converters.
• Medical Devices: Ensuring safety and compliance in equipment requiring ultra-low noise levels.

By integrating properly dimensioned SCF Series Common Mode Inductors, engineers can achieve both EMC compliance and optimal circuit efficiency, balancing electrical performance with mechanical constraints.

Compliance with International Standards

Common Mode Inductors are designed in accordance with:

• IEC 60938 – Passive Filter Units standards
• UL Recognition – ensuring insulation reliability and flame resistance
• EN 61558 and IEC 62368 – applicable to transformer and inductor safety

The SCF Series can be used in designs where reinforced insulation and high dielectric strength are required. Compliance with these regulations ensures that the inductors are suitable for global applications, reducing the need for redesigns across multiple markets.

Customization and Engineering Support

While standard inductors cover most application scenarios, advanced power electronics often require custom Common Mode Inductors. ITACOIL provides engineering support for defining the optimal winding configuration, insulation system, and thermal behavior according to specific customer requirements.

Through proprietary simulation and optimization tools, designs can be adapted to:

• Minimize copper and core losses
• Reduce size and weight without sacrificing EMI performance
• Achieve cost-effective production with consistent quality
• Guarantee compliance with both EMI and safety regulations

This approach ensures that each inductor is not only compliant but also optimized for the specific topology (flyback, resonant LLC, push-pull, or forward converters).

Reliability and Testing

Each Common Mode Inductor undergoes rigorous testing to validate:

• Dielectric strength and insulation resistance
• Thermal stability under continuous load
• Frequency response to confirm filtering effectiveness
• Long-term reliability in harsh industrial environments

In addition, pre-compliance EMI tests can be performed in-house, allowing customers to validate early-stage designs before final certification.

The SCF Series Common Mode Inductors combine compact design, high insulation, and exceptional EMI suppression performance, making them the ideal choice for demanding power electronics applications. Whether used in consumer devices, industrial automation, or renewable energy systems, they provide a reliable and efficient solution for meeting electromagnetic compatibility and safety standards.

For projects requiring special configurations, ITACOIL offers custom Common Mode Inductors tailored to the specific needs of each application, ensuring performance, compliance, and cost-efficiency.