Bobbin/Form: Diameter 5-50 mm, Length 10-100 mm, CTI >250 V

Component Specifications

Definition

A bobbin or form is a structural component in electrical and electronic assemblies, specifically designed to hold and organize wire windings in a precise configuration. It provides mechanical support, electrical insulation between winding layers, and thermal management by facilitating heat dissipation. In transmitter coil assemblies, bobbins ensure consistent winding geometry, which directly affects inductance, capacitance, and overall electromagnetic performance. They are critical for maintaining coil integrity under operational stresses such as vibration, thermal cycling, and electromagnetic forces.

Working Principle

The bobbin serves as a non-conductive core around which conductive wire is wound to create an electromagnetic coil. It maintains the coil's shape and spacing, preventing short circuits between turns and layers. By providing a stable structure, it ensures consistent electrical parameters (inductance, resistance) and mechanical durability. In operation, it isolates the windings from the core or other components, manages thermal expansion, and may include features for mounting or connection terminals.

Materials

Typically made from thermoset plastics (e.g., phenolic, polyester, PBT), thermoplastics (e.g., nylon, PPS), or ceramics. Materials are selected for high dielectric strength, thermal stability (operating temperatures from -40°C to 150°C+), flame retardancy (UL94 V-0 common), and low moisture absorption. May include additives for enhanced mechanical strength or thermal conductivity.

Technical Parameters

Parameter	Typical range	Notes & selection driver
CTI	>250 V
Length	10-100 mm
Diameter	5-50 mm
Winding Area	Customizable
Flange Height	2-20 mm
Temperature Rating	-40°C to 150°C
Dielectric Strength	>1 kV/mm

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 60317, UL 94

Parent Products

This component is used in the following industrial products

Transmitter Coil Assembly

An assembly containing the primary electromagnetic coil responsible for generating and transmitting signals or power in an industrial system.

View Product Details

Engineering Analysis

Risks & Mitigation

Insulation breakdown due to overheating
Mechanical cracking under vibration
Dimensional instability from moisture absorption
Poor winding alignment affecting coil parameters

FMEA Triads

Trigger: Overheating from high current or poor ventilation
Failure: Material degradation leading to insulation breakdown
Mitigation: Use materials with higher thermal ratings, improve cooling design, monitor operating temperatures

Trigger: Mechanical stress from vibration or shock
Failure: Cracking or deformation altering coil geometry
Mitigation: Select impact-resistant materials, add structural reinforcements, implement vibration damping

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1 mm on critical dimensions

Test Method

Dielectric withstand test per IEC 60112, dimensional inspection per ISO 2768, thermal cycling per IEC 60068-2-14

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 Bobbin/Form

Manufacturer profiles associated with Bobbin/Form.

Sourcing Bobbin/Form from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

Related Components

Serial Interface

Serial interface for industrial data transmission between IoT gateways and legacy equipment using RS-232/422/485 protocols.

Marking Ink

Specialized ink for permanent identification on surface mount resistors during manufacturing.

Dielectric Layer

Insulating layer in surface mount capacitors that stores electrical energy through polarization.

Optical Window

Transparent optical component for light transmission in polycarbonate lens housings

Frequently Asked Questions

What is the primary function of a bobbin in a transmitter coil?

The bobbin provides mechanical support for wire windings, ensures electrical insulation between turns, and maintains precise coil geometry for consistent electromagnetic properties.

How do material choices affect bobbin performance?

Materials impact dielectric strength, thermal resistance, and durability. For example, PBT offers good thermal stability, while ceramics provide high-temperature resistance but may be brittle.

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.

Bobbin/Form