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EF20 Switching Power Supply Transformer Frame 5+7 PinsEF20 high frequency bobbin, 5+7 pins EF20 horizontal bobbin. Coil former size=27.5mmX24.8mmX18.0mm, parallel distance=20.32mm, pin pitch/distance 1 =2.5mm. Pin pitch/distance 2=5.08mm. This is our latest best selling product that supports small batch customization. We can also custom transformer related products.