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ER40/15 High Frequency Transformer FrameER40 single slot bobbin 8+8 pins, ER40 ferrite core bobbin, horizontal ER40 transformer bobbin. Parallel Distance=35.4mm. Pin Pitch=5.0mm. Bobbin size=44.0mm*40.0mm*28.4mm. Phenolic bobbin. We can make new ER40 bobbin tooling to meet PCB layout.