Bobbins (Coil Formers), Mounts, Hardware

Part Number	Description / PDF	Quantity
B65806C3001X022 TDK EPCOS	ADJUSTMENT SCREW RM 5	590
B66422W1010D001 TDK EPCOS	BOBBIN COIL FORMER EFD 25X13X9	3354
CLA-E55/28/21 FERROXCUBE	CLAMP	97
B66308W1108T001 TDK EPCOS	BOBBIN COIL FORMER E 16 X 8 X 5	1273
B64293A1400X000 TDK EPCOS	BASE PLATE TOROIDS	42
CP-P11/7-1S FERROXCUBE	COIL FORMER	2181
B65687A1000T001 TDK EPCOS	BOBBIN COIL FORMER PM 74 X 59	21
B66368B1020T001 TDK EPCOS	BOBBIN COIL FORMER ETD 49X25X16	45
CPH-U20/16/7-1S-4P FERROXCUBE	COIL FORMER HORIZONTAL	0
B65888B2005X000 TDK EPCOS	INSULATING WASHER RM 14	220
CLM-EQ20/PLT20 FERROXCUBE	U SHAPED CLIP	1778
CP-P9/5-2S-C FERROXCUBE	COIL FORMER	2
B64291A1704X000 TDK EPCOS	HOUSING HORIZONTAL TOROIDS	56
B66454A1014T001 TDK EPCOS	BOBBIN COIL FORMER E 40X14-1 PTH	79
B65808N1006D002 TDK EPCOS	BOBBIN COIL FORMER RM 6	1264
B66208X1010T001 TDK EPCOS	BOBBIN COIL FORMER E 25 X 13 X 7	1155
TGP-P14/8-C FERROXCUBE	TAG PLATE	606
9677182009 Fair-Rite Products Corp.	77 BOBBIN 3PC. ASSEMBLY	356
CP-P30/19-1S FERROXCUBE	COIL FORMER	1204
CLI-RM8/I-C FERROXCUBE	CLIP	746

Bobbins (Coil Formers), Mounts, Hardware

1. Overview

Bobbins (coil formers), mounts, and hardware are critical mechanical components in magnetic devices. Bobbins serve as structural supports for wound coils in transformers and inductors, while mounts/hardware ensure mechanical stability and electrical connectivity. These components enable precise winding alignment, thermal management, and electromagnetic interference (EMI) control, playing a vital role in power electronics, automotive systems, and industrial equipment.

2. Main Types and Functional Classification

Type	Functional Features	Application Examples
Transformer Bobbins	Provide winding support with insulation barriers	Switch-mode power supplies (SMPS), AC/DC converters
Inductor Coil Formers	Enable precise winding geometry for inductance control	DC/DC converters, EMI filters
PCB Mounts	Secure components to printed circuit boards	Telecom equipment, automotive ECUs
Core Clamps	Mechanical fixation for ferrite/powder cores	High-frequency transformers, PFC circuits

3. Structure and Composition

Typical bobbin structures include:

Central core with winding windows
Insulation barriers (e.g., UL-certified materials)
Termination options: PCB pins, wire terminals
Thermal vias for heat dissipation

Mounts/hardware feature:

Anti-vibration rubber
Corrosion-resistant platings (nickel, zinc)
Adjustable positioning brackets

4. Key Technical Specifications

Parameter	Importance
Temperature Resistance (130-200 C)	Determines thermal stability and lifespan
Dielectric Strength (>2kV)	Ensures safety isolation between windings
Dimensional Tolerance ( 0.05mm)	Impacts winding machine compatibility
Tensile Strength (>50MPa)	Prevents mechanical deformation under load
Surface Resistivity (10^12 )	Prevents leakage current paths

5. Application Fields

Power Electronics: 5G base station PSUs, solar inverters
Automotive: On-board chargers (OBC), 48V DC/DC converters
Industrial: CNC machine power supplies, motor drives
Consumer: Fast chargers, LED drivers

6. Leading Manufacturers

Manufacturer	Representative Products
TDK-Lambda	Compact PCB-mount bobbin series for telecom
Sumec Corporation	High-temp composite coil formers
Eaton Electronics	Vibration-resistant inductor mounts
Fastron IC	Customizable toroidal core hardware kits

7. Selection Guidelines

Key considerations:

Material compatibility with expected operating temperatures
Dimensional matching to core geometries (ETD, PQ, RM types)
Vibration resistance for automotive applications
RoHS compliance for environmental regulations
Cost optimization through standard vs. customized designs

Case Study: Electric vehicle chargers use high-temperature bobbins (UL 1557 recognized) to withstand 150 C continuous operation.

8. Industry Trends

Emerging developments include:

Miniaturization through liquid crystal polymer (LCP) materials
Integrated cooling channels in bobbin designs
Smart mounts with embedded temperature sensors
Increased adoption of 3D-printed custom hardware

Market drivers: Electrification of transportation, 5G infrastructure deployment, and energy-efficient appliance standards.