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EI25 High Frequency Transformer (5+5 Pin) for SMPS, Power Adapters & Industrial Electronics

This model is specifically engineered to address the demands for lightweight, high-efficiency power conversion:
Output Power
For high-frequency switch-mode power supplies with a Flyback topology, the typical maximum output power reaches approximately 16W.
Under custom-designed configurations (e.g., at a frequency of 100kHz), the power range can cover 10W to 25W.
Operating Frequency: The commonly adopted range is 20kHz to 200kHz, when paired with PC40 or PC95 ferrite cores.

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Product Description

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Product Definition & Role

The EI25 high-frequency transformer is a widely used magnetic component designed for energy transfer, voltage conversion, and electrical isolation in switching power systems. With its moderate core size, it provides a practical solution for applications requiring stable performance without increasing system volume significantly.

It plays a key role in maintaining efficient power delivery across various AC-DC and DC-DC topologies.

Functional Flexibility & Circuit Compatibility

The EI25 transformer can be configured for different functional roles depending on system requirements:

Step-down or step-up voltage conversion
Isolation between primary and secondary circuits
Adaptation to various switching topologies

Its flexibility makes it suitable for a wide range of power conversion designs.

Application Coverage

The EI25 high-frequency transformer is widely used in:

Switching power supplies (SMPS)
Power adapters and battery chargers
Industrial control modules
Communication equipment
Audio and consumer electronics

It is particularly suitable for applications in the low-to-medium power range (typically tens to hundreds of watts depending on design).

Technical Specifications

屏幕截图 2025-10-31 135944

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