TDK B66422 Bobbin for EFD25 Core, 10-Pin, GFR Thermosetting Plastic

The TDK B66422W1010D001 is a 10-pin coil former specifically designed for use with the B66421 series of EFD 25/13/9 ferrite cores. Manufactured from glass-fibre reinforced (GFR) thermosetting plastic, this bobbin offers robust mechanical support and reliable electrical insulation for your transformer and inductor applications.

When working with ferrite cores, it is essential to understand their ceramic nature. Ferrites are brittle and sensitive to shock, fast-changing loads, and tensile stress. High cooling rates during ultrasonic cleaning or high static/cyclic loads can cause cracks or failure. Mechanical stresses also affect magnetic properties—higher stress lowers initial permeability. Therefore, the embedding medium should have the greatest possible elasticity.

During operation, ferrites may run hot at higher flux densities and frequencies, and NiZn materials can undergo irreversible magnetic changes in high magnetic fields. This bobbin supports your design with a UL94V-0 flammability rating, ensuring safety and reliability in demanding conditions.

Applications

Ideal for industrial electronic applications, this coil former is a key component in power supplies, converters, and signal transformers. Its precise dimensions (43 mm height, 33 mm width, 15 mm depth) ensure a secure fit with EFD25 cores. With a lightweight design of just 2 grams, it adds minimal weight to your assembly.

Specifications

• Material: Glass-fibre reinforced (GFR) thermosetting plastic
• Number of pins: 10
• Core type: EFD 25/13/9
• Compatible core series: B66421
• Flammability rating: UL94V-0
• Height: 43 mm
• Width: 33 mm
• Depth: 15 mm
• Weight: 2 grams