The EE25 4+4 Pin Transformer Bobbin with matching PC40 ferrite core halves is a complete core-and-bobbin set designed for high-frequency transformers used in SMPS, inverters, LED drivers, chargers, and other power electronics applications.

This set features a vertical-style EE25 bobbin, made from high-temperature, flame-retardant material, along with two precision-machined PC40 ferrite halves that provide excellent magnetic performance, low losses, and high efficiency at switching frequencies.

Perfect for engineers, hobbyists, and product developers, this EE25 core set is ready for winding custom transformers and inductors.

Key Features

• Complete EE25 transformer set: 4+4 pin vertical bobbin + 2 ferrite halves
• High-quality PC40 ferrite material for low-loss, high-frequency operation
• Vertical bobbin design allows compact PCB mounting
• Flame-retardant (UL94V-0) bobbin material
• Smooth winding surface for easy coil construction
• Tight core tolerance for consistent magnetic performance
• Suitable for SMPS, DC-DC converters, LED drivers, chargers, and power modules

Specifications

• Core Type: EE25
• Bobbin Type: Vertical, 4 + 4 pins
• Core Material: PC40 (MnZn ferrite)
• Operating Frequency: Ideal for 20 kHz – 300 kHz
• Ferrite Core Dimensions: Standard EE25 size
• Pin Material: Tin-plated copper
• Bobbin Material: High-temperature nylon (UL94V-0 rated)
• Applications: SMPS transformers, chokes, flyback transformers, forward converters, power supplies

Applications

• Switch-Mode Power Supplies (SMPS)
• DC-DC converters
• LED drivers and lighting power modules
• Mobile and laptop charger circuits
• Flyback / forward transformers
• General high-frequency magnetics prototyping