Inductor/Choke: Frequency Range 10 kHz to 10 MHz

Component Specifications

Definition

An inductor, also known as a choke, is a two-terminal passive electronic component consisting of a coil of insulated wire wound around a magnetic core or air core. It opposes changes in current flow due to its property of inductance, measured in henries (H). In power supply regulation systems, inductors are critical for smoothing DC output by filtering out AC ripple, storing energy during switching cycles, and providing impedance to suppress electromagnetic interference (EMI). They function as energy storage devices in switch-mode power supplies (SMPS), buck/boost converters, and LC filters to maintain stable voltage and current levels.

Working Principle

The inductor operates based on Faraday's law of electromagnetic induction and Lenz's law. When current flows through the coil, it generates a magnetic field around it. Any change in current induces a back electromotive force (EMF) that opposes the change, storing energy in the magnetic field. In power regulation, inductors smooth current variations by releasing stored energy during low-current periods and absorbing it during high-current periods, effectively filtering out high-frequency noise and stabilizing DC output.

Materials

Core materials: Ferrite (Mn-Zn, Ni-Zn), powdered iron, laminated silicon steel, amorphous metal, air core. Wire: Copper (enameled, litz wire), aluminum. Insulation: Polyurethane, polyester, polyimide film. Encapsulation: Epoxy resin, thermoplastic housing.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Q Factor	10 to 100 at specified frequency
Tolerance	±5% to ±20%
Inductance	1 μH to 100 mH
DC Resistance	0.001 Ω to 10 Ω
Current Rating	0.1 A to 100 A
Frequency Range	10 kHz to 10 MHz
Saturation Current	Specified at 10-30% inductance drop
Operating Temperature	-40°C to +125°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

IEC 60205, IEC 62368-1, ISO 9001, DIN EN 140401, MIL-PRF-27

Parent Products

This component is used in the following industrial products

Power Supply Regulation

A circuit component within a signal conditioning system that stabilizes and regulates the power supply to ensure consistent voltage/current for sensitive electronic components.

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Engineering Analysis

Risks & Mitigation

Core saturation leading to circuit failure
Overheating due to high current or poor thermal management
Mechanical damage from vibration or shock
EMI interference if not properly shielded
Parameter drift with temperature changes

FMEA Triads

Trigger: Exceeding rated current or temperature
Failure: Core saturation, insulation breakdown, open or short circuit
Mitigation: Implement current limiting, thermal protection, use derated specifications, and ensure adequate cooling

Trigger: Mechanical stress or vibration
Failure: Wire breakage, core cracking, connection failure
Mitigation: Use ruggedized designs, potting materials, and secure mounting with shock absorbers

Trigger: Manufacturing defects or material inconsistencies
Failure: Parameter variation, reduced lifespan, intermittent operation
Mitigation: Apply strict quality control, batch testing, and compliance with industry standards like ISO 9001

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Inductance tolerance typically ±10% to ±20%, with tighter tolerances (±5% or ±2%) available for precision applications

Test Method

Inductance measured using LCR meters at specified frequency and bias current; saturation tested with DC bias sweep; thermal performance evaluated via temperature cycling and infrared imaging

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

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Inspection readiness

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Manufacturers of Inductor/Choke

Manufacturer profiles associated with Inductor/Choke.

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Frequently Asked Questions

What is the difference between an inductor and a choke?

An inductor is a general term for the component, while a choke specifically refers to inductors designed to block (choke) high-frequency AC signals while allowing DC or low-frequency signals to pass, commonly used in power supply filters.

How do inductors improve power supply efficiency?

Inductors store energy during switching cycles in converters like buck or boost topologies, reducing power loss by smoothing current flow and minimizing ripple, which enhances overall efficiency and stability.

What causes inductor saturation and how to prevent it?

Saturation occurs when the magnetic core can no longer store additional energy, causing a sharp drop in inductance. It is prevented by selecting cores with higher saturation flux density, using air gaps, or oversizing inductors for the application's current requirements.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Inductor/Choke