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EFD20 5+5 Pin AC Transformer for SMPS, Compact Low Profile 15–50W High Frequency Power Transformer

Characteristics:

· Rated input voltage range: 85–265 VAC or 120–375 VDC
· Compact and space-saving design
· Low leakage inductance characteristics
· Available with multiple output configurations
· Operating temperature range from –40 ° C to +125 °C
· Isolation capability from 2 kVAC up to 5 kVAC
· Supports both fixed-frequency and quasi-resonant operation modes
· Most models comply with reinforced insulation requirements

Options:
· Universal 85-265VAC input, 68-250kHz switching frequency
· Low profile, 4500VAC insulation test voltage, -40°C to +125°C operating temp
· For 34W-max SMPS, auxiliary power supplies, power electronics Suitable for white goods & LED lighting

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Product Description

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Product Overview

The EFD20 AC transformer is designed for medium-low power switching power supplies, offering an optimized balance between compact size, efficiency, and thermal performance. Based on the EFD ferrite core structure, it enables reliable energy transfer in high-frequency AC-DC conversion systems.

Common Applications

Industrial and process control equipment
Factory automation systems
USB charging and auxiliary power supplies
Utility metering applications
Security and access control systems
Auxiliary power for garage door openers
Household and home appliances

FAQ：

Q：Do you accept small-batch customized orders (e.g., 50-100 units)? What is the delivery cycle?

A：We accept small-batch customized orders, with a minimum order quantity as low as 50 units. The delivery cycle for such orders is usually 1-2 weeks (depending on product complexity). During production, the "lean CELL production unit" is used to quickly switch production lines, ensuring efficient delivery of small-batch orders to meet your R&D prototyping and small-batch trial production needs.

Physical Properties

Order Code	VIN	Vout1 (V)	lout1 (mA)	Vout2 (V)	lout2 (mA)	Vout3 (V)	lout3 (mA)	Vaux (V)	Vaux2 (V)	L (μH)	fswitch (kHz)	NPRI:NSEC:NAUX	lSAT (A)	VT (V(AC))
INF-EFD20-680μH	85-265V(AC)	12	300	7	2000	-15	300	15	-	680	66	29.33:1:1.67:3:3	1.4	3750

Technical Specifications

屏幕截图 2025-10-30 160521

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