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EI25 5+8 Pin Phenolic High Frequency Transformer BobbinEI25 vertical transformer bobbin 5+8 pin. EI25 phenolic material bobbin. Bobbin Size=28.5mmX20.5mmX20.5mm. Parallel Distance=15.2mm. Pin Pitch1=3.50mm. Pin Pitch2=5.0mm. DIP transformer bobbin. UL REC:94V-0. We can make new bobbin tooling to meet different requirements.