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EE13 7+4 Offline Transformer for Compact AC-DC Switching Power Supply Applications

The EE 13/7/4 Offline Transformer series is engineered with a compact and low-profile footprint, making it perfectly suited for automated Surface Mount Device (SMD) assembly. It operates at frequencies up to 1 MHz, handles primary currents up to 40 A, and performs reliably across a broad temperature range from -40°C to +130°C.

These transformers are supplied in bulk packaging as standard, with a 25% tolerance. Their exceptional characteristics make them ideal for a wide array of applications. Common uses include AC current detection, overload sensing, and load measurement in switch-mode power supplies, as well as metering and load drop/shutdown detection. They are also widely employed in industrial control systems, USB chargers, smart adapters, and household appliances requiring compact, isolated power modules.

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EE13/7/4 OfflineTransformers

Product Description

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Product Overview

The EE13 7+4 Offline Transformer is designed for compact AC-DC switching power supplies requiring stable high-frequency conversion, reliable electrical isolation, and efficient energy transfer. Utilizing an EE13 ferrite core structure, it supports optimized magnetic performance for offline flyback converter applications.

Its 7+4 pin configuration enables flexible winding arrangements and compact PCB integration, making it suitable for space-sensitive electronic power systems.

Compared with larger EE-series transformers, the EE13 focuses on low-power and compact power supply applications while maintaining reliable switching performance and thermal stability.

Customized turns ratios, winding configurations, insulation structures, and output specifications are available according to customer requirements.

Key Features

EE13 ferrite core compact structure
7+4 pin configuration
Designed for offline flyback topology
Stable high-frequency operation
Reliable AC-DC isolation capability
Compact PCB integration support
Optimized for low-power SMPS systems
Flexible customization support

Typical Applications

AC-DC Switching Power Supplies
Compact Power Adapters
LED Driver Systems
Smart Home Electronics
Consumer Electronic Products
Embedded Power Modules
Industrial Control Electronics

Physical Properties

Order Code	L(μH)	n	lR(A)	∫Udt(μVs)	VT(V(AC))	RDC1(mΩ)	RDC2(Ω)
INF-EE13/714-224μH	224	1:20	40	49	1500	0.28	0.033
INF-EE13/714-504μH	504	1:30	40	74	1500	0.28	0.093
INF-EE13/714-896μH	896	1:40	40	99	1500	0.28	0.13
INF-EE13/714-1400μH	1400	1:50	40	124	1500	0.28	0.202
INF-EE13/714-2000μH	2000	1:60	40	148	1500	0.28	0.305
INF-EE13/714-2740μH	2740	1:70	40	173	1500	0.28	0.367
INF-EE13/714-5600μH	5600	1:100	40	248	1500	0.28	0.805
INF-EE13/714-12600μH	12600	1:150	40	372	1500	0.28	1.9
INF-EE13/714-22400μH	22400	1:200	40	496	1500	0.28	2.63
INF-EE13/714-135000μH	135000	1:500	40	1240	1500	0.28	21.2
INF-EE13/714-300000μH	300000	1:750	40	1860	1500	0.28	50.1
INF-EE13/714-540000μH	540000	1:1000	40	2480	1500	0.28	87.64

Technical Specifications 屏幕截图 2025-10-30 145239

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