Coupled Inductors and Common Mode Chokes

ADD Components is a professional electronic components distributor supplying coupled inductors and common mode chokes to procurement teams, contract manufacturers and electronics engineers worldwide. We source dual-winding coupled inductors for multi-phase and isolated DC-DC power, together with common mode chokes and filters for EMI suppression on data and power lines, from leading brands including Coilcraft, Bourns, TDK, Murata and Wurth Elektronik. As an independent distributor we offer competitive wholesale pricing, verified stock and fast global delivery from our Hong Kong operations. Buy inductors online from ADD Components and our team will support every order with datasheets, cross-reference alternatives and hard-to-find part numbers.

Product Types

Coupled Inductors (Dual-Winding)

Coupled inductors combine two windings on a shared magnetic core, providing tight magnetic coupling that delivers several benefits. In SEPIC, Cuk and flyback converters they combine the functions of two discrete inductors into a single compact part, saving board space and cost while improving current matching between windings. In multi-phase buck regulators and voltage regulator modules, coupled inductors reduce ripple current and enable smaller output capacitance, making them essential for high-efficiency server, GPU and telecom power designs.

Common Mode Chokes

Common mode chokes are used to suppress common mode noise while allowing the intended differential signal or power to pass with minimal attenuation. The two windings are arranged so that differential currents cancel their magnetic flux while common mode currents are blocked by high impedance. They are widely used on USB, HDMI, Ethernet, CAN, LIN and other differential data lines, as well as on AC and DC power inputs to help equipment meet EMC standards.

SMD Common Mode Filters

SMD common mode filters are chip-style common mode chokes in compact packages from 0805 upwards. They provide a specified common mode impedance at a target frequency with low DC resistance, making them ideal for high-speed differential signal lines in space-constrained designs such as smartphones, laptops and automotive camera and display links.

Multi-Phase Coupled Inductors

In multi-phase power converters, coupled inductors share flux between the phases of each buck stage. This reduces steady-state and transient ripple, allowing smaller output capacitors and faster transient response. Multi-phase coupled inductors are widely used in high-current CPU, GPU and FPGA power delivery, where they improve efficiency and reduce board area compared with separate inductors per phase.

Typical Applications

Coupled inductors and common mode chokes are found in a wide range of power and signal integrity applications. Coupled inductors support SEPIC, Cuk and flyback DC-DC converters, multi-phase buck regulators for processors, and isolated power supplies. Common mode chokes filter EMI on differential data lines including USB, HDMI, Ethernet, CAN and LIN, and suppress conducted noise on AC and DC power inputs. Together these parts are essential for meeting EMC compliance while maintaining compact, high-efficiency circuit designs.

Selecting the right part requires balancing the coupling ratio and saturation current for coupled inductors, or the common mode impedance and rated current for chokes. ADD Components helps engineers and buyers match specifications to their application, sourcing genuine parts with full traceability and datasheet support for EMI compliance and power converter designs.

Key Selection Parameters

• Inductance per winding and coupling ratio (1:1 or 1:N)

• Rated and saturation current per winding

• Common mode impedance (ohm) at the target frequency

• Differential mode impedance and DC resistance (DCR)

• Rated voltage and insulation withstand voltage

• Package size and mounting type (SMD vs through-hole)

• Operating temperature range and AEC-Q200 qualification

• Application (data line, power line or DC-DC converter)

Representative Inductors We Source

Send Us Your Inductor Requirements

Send us your bill of materials or part numbers and our team will quote competitive wholesale pricing with fast delivery. We supply coupled inductors and common mode chokes in full reels and cut-tape quantities for production and prototyping.

Info@addcomponents.hk | +852 5334 3091 | WhatsApp: +852 5334 3091

Back to Inductor Guide