TDK B66421 Ferrite Half Core Gapped EFD25 8g

The TDK B66421 Ferrite Half Core, Gapped in the EFD25 size is engineered for high-efficiency DC/DC converter applications. Part of the specialised B66421 series, this core features a unique 'E' shape with a flattened, lower centre leg, enabling the design of exceptionally compact and flat transformers ideal for modern, space-constrained electronics. This design optimisation allows for superior thermal management and integration into slimline power supplies.

Manufactured from N87 ferrite material, the core offers excellent magnetic properties, including low core loss at high switching frequencies, ensuring reliable and efficient power conversion. With an effective cross-sectional area (Ae) of 58 mm² and a specified inductance factor (Al) of 250 nH, it provides designers with predictable and stable performance parameters for precise circuit design.

Key Applications

This core is specifically developed for demanding industrial and signal processing environments. Its robust construction and stable magnetic characteristics make it suitable for a wide range of power conversion tasks where reliability, efficiency, and a low-profile form factor are critical.

Specifications at a Glance

• Core Type: Half, Gapped 'E' Core
• Core Size: EFD25
• Material Grade: N87 Ferrite
• Effective Cross-Section (Ae): 58 mm²
• Inductance Factor (Al): 250 nH
• Product Series: B66421
• Weight: 8 grams
• Dimensions: 43 mm (H) x 33 mm (W) x 15 mm (D)

With its combination of a specialised flattened-leg design and high-grade N87 material, the TDK B66421 core is an essential component for engineers seeking to optimise the performance and footprint of their DC/DC converter designs.