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Shenzhen Dowis Electronics Co.,Ltd
Shenzhen Dowis Electronics Co.,Ltd
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EFD20 High-Frequency Transformer Manufacturer Customized DW3339

Shenzhen Dowis Electronics Co.,Ltd
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EFD20 High-Frequency Transformer Manufacturer Customized DW3339

Brand Name : Dowis

Model Number : EFD20, EFD Series

Certification : CE, UL, RoHs, ISO9001, 16949

Place of Origin : CN

MOQ : 1000pcs

Payment Terms : T/T, L/C

Delivery Time : 3-4Weeks

Packaging Details : Carton Box

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EFD20 High-Frequency Transformer Manufacturer Customized DW3339

Shenzhen Dowis Electronics Co., Ltd. is a professional manufacturer of electronic transformers, inductors, and filters integrating R&D, production, and sales. It is a national high-tech enterprise and has passed the IATF16949:2016 automotive industry quality management system certification, the product has passed the "UL""CQC" and other safety certifications. The products are widely used in communication equipment, new energy vehicles, industrial control equipment, high-power LED drives and other market areas. The industry has high visibility. In addition to the domestic market, but also exported to many countries in Europe and the United States.

In order to further expand production capacity, it has set up a special test area construction area in zhaoqing YueGui cooperation in 2018 of 14000 square meters of manufacturing center named ZhaoQing Sheng Xiang electronic technology co., Ltd. Its management technical team has rich experience in cooperating with customers from well-known domestic enterprises and overseas. The design of products can fully follow customer’s needs and services with a good quality control system, and it has been recognized by many famous enterprises as the core suppliers. We look forward to cooperating with you.

1. Drawing (Unit: mm)
EFD20 High-Frequency Transformer Manufacturer Customized DW3339



2. Environmental conditions

  • Storage temperature: -40 -- 85℃
  • Ambient temperature: -40 -- 85℃
  • Working temperature: 110℃MAX
  • Relative humidity: 5%-95%
  • Long-term durability experiment.



3. Electrical Characteristics

Item Unit Test Terminal Test Condition MIN NOR MAX
Inductance Test µH 14-13 100KHz,0.3V, Ser 760 800 840
Leakage Test µH 14-13

100KHz,0.3V, Ser

(other winding short circuit)

/ / 18
Q Value / 14-13 100KHz,0.3V, Ser 105 / /
Resistance Strength mA N1,N2-N3,N4,N5,N6,N7 3750Vac,60s / / 1
mA N1,N2——core 2250Vac,60s / / 1
mA N3,N4,N5,N6,N7——core 3750Vac,60s / / 1
Direct Current Resistance Ω 14-13 25℃ / / 3.3
9-10 25℃ / / 335
1-A 25℃ / / 215
6-7 25℃ / / 195
8-6 25℃ / / 205
2-3 25℃ / / 365
5-4 25℃ / / 205
Insulation Resistance Np-Ns 500Vdc 100 / /

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EFD20 High-Frequency Transformer Manufacturer Customized DW3339 Images

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