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EI19 Ferrite Core Bobbin Vertical Transformer Bobbin With Pin 3+3Transformer bobbin factory. EI19 vertical transformer bobbin 3+3 pin. Bobbin Size=15mmX13.6mmX14.9mm. Parallel Distance=11.5mm. Pin Pitch=4.8mm. PA66 material bobbin. DIP transformer bobbin. UL REC:94V-0. We can make new bobbin tooling to meet different requirements.