English 
Add : Room 701, Building A1, No. 55 Runfa Road, Jiangning District, Nanjing, China
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The EE4.4 Offline Transformer is designed for compact AC-DC switching power supplies, miniature adapters, chargers, and low-power electronic applications. Utilizing a precision-engineered EE4.4 ferrite core and optimized winding structure, it provides stable high-frequency performance, efficient energy transfer, and reliable electrical isolation.
Its ultra-compact design makes it ideal for space-limited PCB layouts while maintaining low core loss and excellent thermal stability. The transformer is widely used in compact power conversion systems requiring high efficiency, long-term reliability, and consistent output performance.
Customized winding structures, turns ratios, and pin configurations are available according to different application requirements.
Compact EE4.4 ferrite core for miniature power designs
Optimized for offline AC-DC switching applications
High-frequency operation with low core loss
Efficient energy transfer and stable output performance
Reliable electrical isolation and safety performance
Excellent thermal stability under continuous operation
Suitable for compact PCB layouts
Flexible customization available
Miniature AC-DC Power Supplies
Power Adapters and Chargers
Low-Power Switching Power Supplies
Smart Home Electronics
Consumer Electronic Devices
Industrial Control Circuits
LED Driver Modules
Physical Properties
| Order Code | L(μH) | n | lR(A) | ∫Udt(μVs) | VT(V(AC)) | RDC1(mΩ) | RDC2(Ω) |
| INF-EE4.4-33μH | 33 | 1:20 | 7 | 9 | 750 | 3 | 0.35 |
| INF-EE4.4-74μH | 74 | 1:30 | 7 | 13.5 | 750 | 3 | 0.8 |
| INF-EE4.4-132μH | 132 | 1:40 | 7 | 18 | 750 | 3 | 1.6 |
| INF-EE4.4-205μH | 205 | 1:50 | 7 | 22.5 | 750 | 3 | 2.5 |
| INF-EE4.4-295μH | 295 | 1:60 | 7 | 27 | 750 | 3 | 3.6 |
| INF-EE4.4-400μH | 400 | 1:70 | 7 | 31.5 | 750 | 3 | 4.6 |
| INF-EE4.4-820μH | 820 | 1:100 | 7 | 45 | 750 | 3 | 9.5 |
| INF-EE4.4-1280μH | 1280 | 1:125 | 7 | 56.2 | 750 | 3 | 13 |
| INF-EE4.4-1800μH | 1800 | 1:150 | 7 | 67.5 | 750 | 3 | 21 |
Technical Specifications
| 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 |
| 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 |
| Optional Packaging | Vacuum sealed packaging for customers with strict moisture-proof requirements |
