1. Compact SMD Package
20×19×10mm footprint, compatible with pick-and-place assembly (reflow max 260°C).
2. High-Frequency Operation
Optimized for 200kHz–1MHz (PC40/PC44 ferrite, core loss <50mW/cm³ @ 500kHz).
3. Low Leakage Inductance
Interleaved winding design (LLK <2% of Lp).
4. EMI Mitigation
Built-in Faraday shield (common-mode noise rejection >20dB).
5. Automotive-Grade Reliability
AEC-Q200 qualified (operating range: -40°C to +150°C).
PoE Modules: IEEE 802.3af/at (15W–30W).
Fast Chargers: GaN-based USB PD 3.0 (20W).
IoT Sensors: Isolated DC/DC for industrial IoT (3.3V/5V).
Automotive LED: Matrix headlight drivers (12V→60V).
Note: Ideal for 5–20W high-density designs requiring SMD compatibility.
YET focus in custom development and low volume methodology allow us to be one of the most flexible and agile manufacturers in the industry.
Our engineering staff has a vast wealth of professional knowledge.YET can deliver custom magnetics products on time to any country.
YET can design and build magnetics from customer design prints, re-engineer to enhance magnetics products to support customer needs, and reverse engineer magnetics products.
| ITEM | YET' P/N | Equivalent Substitutes | ||
| EFD20 Series | TDK EFD20 | Würth EFD20 | ||
| Electrical Parameters | Operating Frequency | 20kHz-500kHz | 50kHz-500kHz | 50kHz-500kHz |
| Rated Power | 15～50W | 20～50W | 15～50W | |
| Input Voltage | 5VDC～100VDC | 5VDC～100VDC | 5VDC～100VDC | |
| Output Voltage | 3.3VDC～150VDC | 3.3VDC～150VDC | 3.3VDC～150VDC | |
| Inductance (Primary) | 30μH～2200μH | 50μH～2000μH | 80μH～2500μH | |
| DCR | 0.10～1.5Ω (Pri.) | 0.08～1.2Ω (Pri.) | 0.1～1.8Ω (Pri.) | |
| 0.05～0.7Ω (Sec.) | 0.03～0.6Ω (Sec.) | 0.05～0.7Ω (Sec.) | ||
| Hi-pot | 3k～4kVAC (Pri.-Sec.) | 1.5k～6kVAC (Pri.-Sec.) | 3k～4.5kVAC (Pri.-Sec.) | |
| Core Characteristics | Core Material | PC95 Ferrite | PC95 or PC44 Ferrite | N87 or N49 Ferrite |
| Structure & Thermal Management | Cooling Method | air cooling | Forced cooling（>40W) | air cooling |
| Insulation Class | Class F | Class B | Class B | |
| Temperature Range | -40℃~+150℃ | -40℃~+125℃ | -40℃~+125℃ | |
| Certifications & Compliance | Safety Certifications | CQC、3C | UL、CE | UL、CE |
| Environmental Certifications | RoHS、REACH | RoHS、REACH | RoHS、REACH | |
EFD20 SERIES SMD TRANSFORMER.pdf
