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SMD EFD12 Power Transformer BobbinEFD12 SMT transformer frame, 4+4 pins horizontal coil bobbin. Parallel Distance=16.3mm. Pin pitch=3.0mm. Bobbin Size=20.0mmX13.5mmX6.7mm. We manufacture final EFD12 electronic transformer, accept custom made transformer and inductor, samples can be sent for prototype testing.