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EF25 Vertical (5+5) Offline Transformers

EF25 Vertical 5+5 Pin Flyback Transformer for Offline AC-DC SMPS Power Supplies

The EF25 Vertical (5+5) offline transformer is a high-performance vertical-type magnetic component specially developed for universal switching power supply systems. It adopts a compact vertical structure with a 5+5 pin configuration, effectively saving horizontal PCB space while maintaining excellent electrical performance.

This transformer is most commonly applied in Flyback power supply topology, with optimized winding technology to achieve extremely low leakage inductance, which effectively improves the stability and conversion efficiency of the flyback circuit. Supporting a wide nominal input range of 85–265VAC (120–375VDC), it adapts to global power grid standards and various application environments.

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Product Description

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Product Overview

The EF25 Vertical 5+5 Pin Flyback Transformer is designed for offline AC-DC switching power supply applications. It is widely used in flyback converter topologies, providing efficient energy transfer and reliable isolation between primary and secondary circuits.

With its EF25 ferrite core and vertical mounting structure, this transformer offers a good balance between power capability, compact size, and thermal performance. It is suitable for medium-power applications requiring stable output and high reliability.

Custom design options are available to meet various circuit requirements.

Typical Applications

AC-DC Power Supplies
Flyback Converters
Power Adapters
Battery Chargers
LED Drivers
Industrial Control Power Systems

Peculiarity:

Bobbin types adopt traditional styles , transformer design parameters are subject to customer requirements or injection specifications, supporting global ODM/OEM cooperation.

Technical Specifications

屏幕截图 2025-10-30 152927

Customization & Procurement

Main Category	Subcategory	Details
MOQ	Prototyping & Small-batch	10 piece minimum order
	Sample Service	Free proofing & custom service, 5 free samples (shipping at buyer’s cost)
	Bulk Order	5,000 pieces and above with bulk pricing
Lead Time	All Standard Components	Shipped within 5–7 working days
	Custom Inductance / Pin Design (Sample)	Sample order confirmed within 5–7 working days
	Custom Inductance / Pin Design (Mass Order)	Shipped within 15–30 working days
Payment Terms	Main Payment Term	T/T in advance, L/C at sight
	Procurement Standard	Complies with global enterprise procurement standard for passive components
	Quality Deposit	No quality security deposit required
	Accepted Terms	FOB Shanghai / Nanjing / Hong Kong, T/T Advance
Quality Assurance	Manufacturing Defects	Free replacement for issues caused by manufacturing defects
Quality Assurance	Inspection Report	Batch inspection reports available as certification upon customer request
Packaging Specifications	Updated Packaging (2026)	Blister tray packaging; Sealed Tape & Reel for SMD products
Packaging Specifications	Optional Packaging	Vacuum sealed packaging for customers with strict moisture-proof requirements