Winding: Inductance Range 1μH-100mH, Wire Gauge AWG 18-44

Component Specifications

Definition

A winding is an essential component in isolation barriers such as optocouplers and transformers, consisting of insulated conductive wire wound around a core. In optocouplers, it typically refers to the primary or secondary coil that interacts with light-emitting diodes or photodetectors to enable signal transfer without electrical contact. In transformers, windings create electromagnetic fields for voltage transformation while maintaining isolation between circuits. The winding's design determines key parameters like inductance, resistance, and isolation voltage capability.

Working Principle

Windings operate on electromagnetic induction principles. When alternating current flows through the primary winding, it generates a varying magnetic field that induces voltage in the secondary winding. In digital (magnetic) isolators, a pair of windings forms an on-chip transformer that couples the signal across the isolation barrier while keeping the input and output circuits galvanically separated.

Materials

Copper or aluminum wire with polyurethane, polyester, or polyimide insulation; core materials include ferrite, powdered iron, or air for high-frequency applications; insulation materials rated for specific voltage classes (e.g., Class A: 105°C, Class B: 130°C, Class F: 155°C, Class H: 180°C).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Wire Gauge	AWG 18-44
Turns Ratio	1:1 to 1:100
DC Resistance	0.1Ω-100Ω
Inductance Range	1μH-100mH
Isolation Voltage	1500V-5000V
Insulation Voltage	300V-5000V RMS
Temperature Rating	-40°C to +155°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

ISO 9001, IEC 61558, UL 1446, IEC 60747-5

Parent Products

This component is used in the following industrial products

Isolation Barrier (Optocoupler/Transformer)

An electrical safety component that provides galvanic isolation between circuits while allowing signal or power transfer.

View Product Details

Transformer / Inductor

Electromagnetic components in power converters that transfer energy, change voltage levels, or store energy in magnetic fields.

View Product Details

Engineering Analysis

Risks & Mitigation

Insulation breakdown
Wire fatigue and breakage
Overheating due to excessive current
Inter-winding short circuits
Corrosion of conductive materials

FMEA Triads

Trigger: Insufficient insulation thickness or material defects
Failure: Electrical breakdown between windings
Mitigation: Implement 100% hipot testing, use insulation materials with appropriate voltage ratings, maintain proper creepage distances

Trigger: Mechanical stress during winding process
Failure: Wire breakage or insulation damage
Mitigation: Control winding tension, use proper wire guides, implement automated winding with tension feedback

Trigger: Thermal expansion mismatch between materials
Failure: Cracking of insulation or solder joints
Mitigation: Use materials with compatible thermal coefficients, implement thermal cycling tests, design with stress relief features

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Inductance: ±10% to ±20%, Turns ratio: ±1% to ±5%, DC resistance: ±5% to ±10%

Test Method

Hipot testing per IEC 60950, inductance measurement with LCR meter, turns ratio verification with ratio bridge, insulation resistance testing at 500VDC

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

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Winding

Manufacturer profiles associated with Winding.

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Frequently Asked Questions

What is the difference between winding in optocouplers vs transformers?

In optocouplers, windings are typically part of a transformer that works with optical components to provide complete galvanic isolation, while in transformers, windings directly transfer energy through electromagnetic induction with varying turns ratios for voltage transformation.

How does winding insulation affect isolation performance?

Winding insulation determines the isolation voltage rating and prevents electrical breakdown between turns and layers. Higher quality insulation materials and proper winding techniques ensure reliable isolation up to specified voltage levels.

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.

Winding