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ETD39
INF
The ETD39 LLCR Resonant Converter AC Transformer is a dedicated magnetic component engineered exclusively for LLC resonant converter topologies, featuring a high-performance ETD39 ferrite core and precision multi-layer windings. With a maximum power output of 250W and ultra-high energy conversion efficiency, this 250W ETD39 core LLC resonant transformer is a core component for high-efficiency power conversion systems, supporting a wide DC input voltage range of 360-400V and versatile output voltages (12V/24V/48V) with an 18V auxiliary voltage output. What sets this transformer apart is its pre-defined leakage inductance (95μH), which eliminates the need for additional resonant inductors in LLC circuit design, simplifying PCB layout and reducing BOM costs for ToB customers. Optimized for a switching frequency range of 70-120kHz, it is designed for industrial-grade reliability, making it an ideal choice for high-efficiency PC power supplies, LED lighting fixtures and industrial LLC resonant converter systems.
Built with a high-permeability ETD39 ferrite core and Litz wire windings, the ETD39 LLCR Resonant Converter AC Transformer achieves ultra-high energy conversion efficiency (up to industrial-grade high efficiency standards) and a stable 250W maximum power output. The low eddy current loss design ensures minimal heat generation, enabling compact and heat-dissipating power supply module design.
As a pre-defined leakage inductance ETD39 transformer, it integrates a fixed 95μH leakage inductance into the core design, eliminating the need for external resonant inductors in LLC resonant converter circuits. This not only reduces the number of circuit components and BOM costs but also optimizes PCB space utilization for miniaturized power supply designs.
Supporting 12V/24V/48V main output voltages and a fixed 18V auxiliary voltage, it adapts to diverse load requirements of PC power supplies and LED lighting drivers. The 70-120kHz switching frequency range is fully compatible with mainstream LLC resonant converter control chips, with a 3.5A saturation current ensuring stable operation under peak load conditions.
Order Code | VIN | Vout1 | lout1 | Vaux | L | fswitch | n | LS | lSAT | RDC 1 | RDC 2 | RDC 3 | RDC 4 |
INF-ETD39-500μH | 360-400V(DC) | 12 | 16.7 | 18 | 500 | 70-120 | 35:2:2:3 | 95 | 3.5 | 145 | 2.5 | 2.5 | 150 |
INF-ETD39-500μH | 360-400V(DC) | 24 | 8.3 | 18 | 500 | 70-120 | 35:4:4:3 | 95 | 3.5 | 145 | 7.5 | 7.5 | 160 |
INF-ETD39-500μH | 360-400V(DC) | 48 | 4.2 | 18 | 500 | 70-120 | 35:8:8:3 | 95 | 3.5 | 145 | 21.5 | 21.5 | 160 |
As an ETD39 AC transformer for PC power supplies, it is the core component of high-efficiency ATX/ITX PC power supplies, supporting high-power and miniaturized design requirements of gaming and industrial PCs, with stable voltage output and low noise characteristics.
Suitable for high-power LED lighting drivers (e.g., industrial LED floodlights, commercial LED panel lights), it provides efficient and stable power conversion, matching the dimming and high-reliability requirements of LED lighting systems.
Widely used in industrial-grade LLC resonant converter power modules, including industrial control power supplies, communication base station power supplies and medical equipment auxiliary power supplies, adapting to harsh industrial operating environments with high stability and anti-interference performance.
The ETD39 LLCR Resonant Converter AC Transformer meets international industrial and safety certification standards, with all models passing strict performance and environmental tests:
RoHS compliant, free of lead, mercury and other restricted hazardous substances
CE certified, meeting EU low-voltage and EMC directive requirements
ISO 9001 quality management system certified, ensuring consistent bulk production quality
3750V insulation test passed, with high electrical safety performance for high-voltage input applications
| 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 |
We offer customized winding and turn ratio (n) design services for ToB customers, supporting custom input/output voltages, auxiliary voltage values and leakage inductance parameters to match specific LLC resonant converter circuit designs.
