What is a Inductor? | Common Mode Power Line Choke Manufacturer | Coilmaster Electronics

What is a Inductor? | Coilmaster Electronics specialize in the production of SMD power inductors, common mode choke, high frequency transformers.

What is a Inductor?

The inductor also called for coil, choke, or reactor. Is a passive component with two two-terminal, designed to resist changes in current.


An inductor is an electronic component that can convert electrical current into a magnetic field. It typically consists of a winding of wire wrapped around a magnetic core. When a current flows through the winding, it produces a magnetic field, and vice versa, when the magnetic field changes, it also produces a current. The function of an inductor can be to convert current into a magnetic field or to convert a magnetic field into current. Additionally, inductors can be used in filters to reduce noise in circuits. In electronic products such as power supplies and audio equipment, inductors play an important role. Inductors can be used to regulate current in circuits, control signal transmission, switch current, receive frequency signals, or stabilize voltage, among other applications. To meet different requirements, inductors also vary in structure and can be roughly classified into four types: 1. Shielded inductors, 2. Semi-shielded inductors (molded inductors), 3. Unshielded (non-shielded) inductors, 4. Common-mode inductors.

Shielded Power Inductor for Reliable Performance in Critical Applications

Use Cases-DC-DC Converters: Looking for a high-performance inductor for your electronic designs? The Shielded Power Inductor (e.g., Coilmaster SDS127H series, dimension: 12×12×7 mm) is the ideal solution. Designed for DC-DC converters, it ensures stable power delivery and minimizes EMI in consumer electronics and industrial modules. Its robust design makes it perfect for automotive applications, such as infotainment systems, ECUs, and LED lighting, where noise suppression is essential. Additionally, it excels in computing and server power rails, effectively regulating voltage and reducing ripple to support high-performance motherboards.

Unshielded (Non-Shielded) Wirewound Inductor for Cost-Effective Power Solutions

Optimize your electronic designs with the Semi-Shielded (Molded) Power Inductor (e.g., Coilmaster SQH6045S series, dimension: 6×6×4.5 mm). This compact inductor is a space-saving solution for portable devices like smartphones, tablets, and wearables, offering moderate EMI containment without compromising on performance. It's also an excellent choice for industrial control units, striking the perfect balance between cost and performance in medium-noise environments. Furthermore, it enhances audio equipment by reducing interference and maintaining signal clarity in compact audio amplifiers and speakers, ensuring superior sound quality.

Common Mode Choke for Superior EMI Suppression

Achieve reliable EMI control with the Common Mode Choke (e.g., Coilmaster MM4532 series, dimension: 4.5×3.2×2.8 mm). This compact yet powerful component is essential for EMI filtering in data lines, ensuring clean signal transmission in USB, HDMI, and Ethernet cables by suppressing common mode noise. It is equally effective in power line noise reduction, enabling industrial and consumer devices to meet stringent regulatory EMI standards. Furthermore, it is a trusted choice for automotive networking modules, such as CAN and FlexRay bus systems, where robust EMI suppression is paramount for stable performance.

Semi-Shielded (Molded) Power Inductor for Compact and Efficient Applications

For applications where EMI sensitivity is not a primary concern, the Unshielded (Non-Shielded) Wirewound Inductor (e.g., Coilmaster SDR54 series, dimension: 5.8×5.2×4.5 mm) offers a budget-friendly and efficient solution. Designed for entry-level power supplies, it is perfect for projects prioritizing cost-effectiveness in less EMI-sensitive environments. Its versatility makes it ideal for general electronics, including hobbyist builds, prototypes, or circuits with minimal noise requirements. Additionally, it finds utility in lighting ballasts, supporting less sensitive lighting circuits that do not require stringent EMI shielding.

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What is a Inductor? | High Voltage Power Inductors Manufacturer | Coilmaster Electronics

Located in Taiwan since 1995, Coilmaster Electronics Co., Ltd. has been a manufacturer of magnetic components. Its main magnetic components include, common mode chokes, SMD molding power chokes, chock coil inductors, SMD shielded and semi-shielded power inductors, low profile and high current power inductors, high voltage power inductors, ethernet and LAN power transformers, flat wire inductors, RJ45 jacks with integrated magnetics and high frequency transformers, and ceramic or air coil multilayer chip inductors.

Coilmaster is a professional manufacturer for inductor, common mode choke, chip beads and transformer. Our vision is “Creating high-performance inductors, reducing energy loss, and contributing to sustainable” To achieve this, our engineer team is keen to design the power inductor to have better efficiency. With more than 20 years of experience in magnetic territory, Coilmaster Electronics is specialized in the production of SMD power inductors, common mode choke, high frequency transformers.

Coilmaster Electronics has been providing customers with high current power inductors since 1995, with both advanced technology and 29 years of experience, Coilmaster Electronics ensures that each customer's requirements are met.