You are here: Home » Products » Transformers » AC Transformer » EI Series Transformer » EI28 5+5 Pin High Frequency Transformer for Industrial Power Supply Design

EI28 5+5 Pin High Frequency Transformer for Industrial Power Supply Design

The EI28 (5+5) transformer is defined as a power transformation component that adopts an EI28 magnetic core and features a 5+5 pin arrangement—usually a vertically installed dual-groove bobbin. It is widely utilized in low-power electronic equipment, including small-sized power supplies, household electrical appliances, and LED driver modules.

Primary application in the following fields: Switch-Mode Power Supplies (SMPS): It stands as an ideal option for switch regulators, inverters and power factor correction chokes. Power adapters: It provides steady multi-voltage output (e.g., 6V, 9V, 12V, 24V, etc.). Consumer electronic products: These cover DVD players, LED power boards, power boards for LCD TVs and monitors, chargers, and more.

Quantity:
Availability:





Inquiry

EI28(5+5) High Frequency Transformers EI28 transformer Custom EI28 high frequency transformer EI28 high frequency transformer EI28 ferrite transformer EI28 switching transformer EI28 SMPS transformer EI28 power transformer EI28 transformer manufacturer EI28 transformer supplier

Product Description

Download

Product Positioning & Application Level

The EI28 high-frequency transformer is designed for applications requiring higher power capability and improved energy transfer efficiency compared to smaller EI series models. With its increased core size and optimized structure, it serves as a reliable solution for medium-to-high power switching power systems.

It is commonly used in power electronics where stable output and efficient conversion are essential.

Magnetic Coupling & Efficiency Optimization

The EI structure ensures efficient magnetic coupling between windings, enabling stable and low-loss energy transfer:

Reduced leakage inductance through optimized winding layout
Improved coupling coefficient for better efficiency
Lower energy loss during high-frequency switching

Efficient magnetic design plays a key role in minimizing losses and ensuring stable operation in switching power supplies.

Application Range

The EI28 high-frequency transformer is suitable for a wide range of power applications:

Switching mode power supplies (SMPS)
DC-DC and AC-DC converters
Industrial automation systems
Power adapters and battery chargers
Consumer electronics and smart devices

Its higher power capability makes it particularly suitable for demanding electronic systems.

Technical Specifications

屏幕截图 2025-10-31 140641

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