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EFD20 SMT Power Transformer Bobbin 4+7 PinsSMD EFD20 transformer bobbin, 4+7 pins horizontal EFD20 coil former. Bobbin size=27.9X19.4mmX7.7mm. Multi-section EFD20 bobbin LCP-E4008 material, EFD20 transformers for SMPS, welcome custom electronic transformer.