What are Power Inductors?

Power inductors are magnetic components designed to store energy in a magnetic field when current flows through a wound conductor. They are fundamental elements in power electronic circuits, where they regulate current ripple, store and transfer energy in switching converters, and suppress high-frequency noise. Their performance depends on core material properties, winding structure, and magnetic geometry, all of which determine inductance stability and loss characteristics under load.

In applications such as DC-DC converters, voltage regulators, and EMI suppression networks, power inductors influence efficiency, transient response, and thermal behavior. Electrical parameters, including inductance value, DC resistance, and current handling capability directly impact conduction losses, magnetic saturation behavior, and frequency response. Careful specification matching ensures reliable operation, minimized losses, and predictable performance within the intended operating environment.

Key Specifications

• Type: Identifies the construction style and core technology of the inductor, such as shielded or unshielded designs and different core materials. The type determines magnetic containment, electromagnetic compatibility performance, mechanical profile, and suitability for specific power conversion topologies.
• Inductance: Specifies the nominal inductance value, representing the component’s ability to oppose changes in current. Inductance directly influences ripple current, energy storage capability, and dynamic response in switching power supplies.
• Inductance Tolerance: Indicates the permissible variation of the actual inductance from its nominal value. Tolerance affects circuit stability, control loop behavior, and predictable current ripple performance.
• DC Resistance: Represents the resistance of the winding under direct current conditions. DC resistance contributes to conduction losses and temperature rise, directly impacting overall efficiency and thermal management.
• Saturation Current: Defines the current level at which the magnetic core begins to saturate, causing a significant reduction in effective inductance. This parameter is critical for preventing excessive ripple, waveform distortion, and loss of regulation under high load conditions.
• Self-resonant Frequency: Indicates the frequency at which the inductor’s parasitic capacitance resonates with its inductance. Above this frequency, the component no longer behaves as a pure inductor, making this parameter essential for high-frequency performance evaluation.

The Largest Database of Power Inductors

everything PE has listed Power Inductors from the leading manufacturers and made them searchable by specification. You can enter the key parameters and the search tool will scan catalogs from the leading manufacturers to identify products that meet your spec. Once you find Power Inductors that meet your requirement, you can view product information, download datasheets or request quotations. Quotation requests will be routed to the manufacturer of the product who will get back to you directly. The quotation will also be routed to distributors of the product in your region.