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Power Supply Transformer EC28 Horizontal BobbinEC28 6+6 pins horizontal transformer bobbin. EC/ER28 coil inductor bobbin. Bobbin Size=29.0mmX28.0mmX24.0mm. Parallel Distance=25.0mm. Pin pitch=5.0mm. Phenolic material transformer Bobbin. DIP transformer bobbin. UL REC:94V-0.