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PQ20 Switching Power Transformer Frame 6+8 Pins6+8 pins PQ20/20 coil former, vertical PQ20 though hole bobbin. Parallel Distance=20.5mm. PQ20 ferrite core bobbin. Bobbin Size=23.0cmX23.0cmX23.30cm. Pin pitch=2.54mm. Pin pitch=3.80mm. PQ20 series bobbin for high power PQ20 transformer, welcome customized PQ20 electronic transformer.