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EI12.5 PCB Mounting Transformer BobbinEI12.5 ferrite core bobbin, 5+5 pins EI12.5 coil former. Bobbin size=12.6mmX12.2mmX8.7mm, Parallel distance=7.5mm. Bobbin pin pitch=2.5mm. We produce various transformer bobbins and supply magnetic cores, we accept make new tooling to meet special size requirements.