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Vertical Bobbin EC28 For Electronic Isolation TransformerEC28 ferrite core transformer bobbin. 5+5 pin vertical EC/ER28 coil former. Bobbin Size=25.0mmX22.0mmX19.3mm. Parallel Distance=16.5mm. Pin pitch=5mm. Phenolic material transformer Bobbin. DIP transformer bobbin. UL REC:94V-0.