Filter Inductor (Choke Coil) | Choke Coil Filter Inductor

Product Specifications

Technical details and manufacturing context for Filter Inductor (Choke)

Definition

A filter inductor, commonly called a choke, is a passive electronic component that stores energy in a magnetic field when current flows through it. In the output rectifier and filter section of power supplies, it works with capacitors to smooth the pulsating DC output from rectifiers, reducing ripple voltage and suppressing electromagnetic interference (EMI) to provide stable DC power to downstream circuits. The inductor opposes changes in current due to its inductive reactance, which increases with frequency. This property allows it to present high impedance to AC ripple components while allowing DC to pass with minimal resistance. Filter inductors are typically wound with copper wire on a magnetic core, such as ferrite, iron powder, or sendust, and are available in various mounting styles including through-hole, surface mount, and chassis mount. Key parameters include inductance (typically 1–100 mH), rated current (1–50 A), DC resistance (0.01–1 Ω), saturation current (1.2–2.0 times rated current), operating temperature range (-40 to 85 °C), insulation resistance (≥100 MΩ at 500 V DC), dielectric strength (1500–3000 V AC for 1 minute), and inductance tolerance (±10% to ±20%). These values are reference ranges and must be verified for the specific model and application. Standards such as IEC 60076-6, IEC 60068-2-1/2, IEC 60216, and IEC 60950-1 may be used as procurement references, but do not imply certification. Always confirm model-specific specifications and compliance with the legal manufacturer or supplier.

Working Principle

The filter inductor operates based on electromagnetic induction. When current flows through its coil, it creates a magnetic field that stores energy. This property causes it to oppose changes in current (inductive reactance), particularly at higher frequencies. In filtering applications, it presents high impedance to AC ripple components while allowing DC to pass with minimal resistance, effectively attenuating unwanted high-frequency noise.

Common Materials

Ferrite core, Copper wire, Insulation materials, Bobbin

Technical Parameters

Parameter	Typical range	Notes & selection driver
Inductance	1–100 mH	Select based on ripple frequency and load currentIEC 60076-6
Rated Current	1–50 A	Continuous DC current without saturation
DC Resistance	0.01–1 Ω	Lower is better for efficiency
Saturation Current	1.2–2.0 × rated	Inductance drops 10% at this current
Operating Temperature	-40–85 °C	Derate current above 85°CIEC 60068-2-1/2
Insulation Resistance	≥100 MΩ	Measured at 500 V DCIEC 60216
Dielectric Strength	1500–3000 V AC	Withstand voltage for 1 minuteIEC 60950-1
Inductance Tolerance	±10–±20 %	Tighter tolerance costs moreIEC 60076-6
Core Material	Ferrite, Iron powder, Sendust	Ferrite for high frequency, iron powder for high current
Mounting Type	Through-hole, SMD, Chassis	Select based on PCB or panel mounting
Dimensions (L×W×H)	10×10×10 – 100×100×50 mm	Check for fit in enclosure
Weight	5–500 g	Affects mechanical design

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

Components / BOM

Magnetic Core Part
Provides a path for magnetic flux and determines inductance characteristics

Material: Ferrite or other magnetic material
Coil Winding Part
Conducts electrical current and creates the magnetic field

Material: Copper or aluminum wire
Bobbin Part
Supports and insulates the coil winding from the core

Material: Plastic or other insulating material
Terminals Part
Provides electrical connection points for circuit integration

Material: Copper alloy or other conductive material

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Filter Inductor (Choke).

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Output Rectifier and Filter

View system integration details

Manufacturers of Filter Inductor (Choke)

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Zibo Yunqi

Shandong, CN

Also makes: High-Frequency Transformer, Common-Mode Choke, Current Transformer and 3 more

Listed on the company's own website · profile compiled by CNFX from public sources

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Frequently Asked Questions

What is the difference between a filter inductor and a regular inductor?

A filter inductor is specifically designed for filtering applications in power supplies, with characteristics optimized for high impedance to AC ripple and low DC resistance. Regular inductors may serve other purposes such as energy storage in converters or tuning in RF circuits.

How do I select the right inductance value for my application?

Inductance selection depends on the ripple frequency and load current. Higher inductance provides better filtering but may increase size and resistance. Use the reference range (1–100 mH) as a starting point and verify with the manufacturer based on your circuit requirements.

What does saturation current mean and why is it important?

Saturation current is the DC current at which the inductance drops by 10%. Operating above this current can cause the inductor to lose its filtering effectiveness. The reference range is 1.2–2.0 times the rated current, but always confirm for the specific model.

Can I use a filter inductor in high-temperature environments?

The operating temperature range is typically -40 to 85 °C. Above 85 °C, derating of current is required. Always check the manufacturer's datasheet for derating curves and ensure adequate cooling in your application.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric (not pressure-rated; typical enclosure protection IP00-IP67 depending on housing)
other spec:	Current rating (DC or RMS), inductance tolerance (±10% to ±30% typical), self-resonant frequency (SRF) > 10x switching frequency
temperature:	-40°C to +125°C (ambient operating range, derating may apply above 85°C)

Filter Inductor (Choke)

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards