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ER42 Power Supply Vertical Coil BobbinSwitch power transformer ER42. 9+9 pins ER42 vertical bobbin. Bobbin Size=45.50mmX32.00mmX29.7mm. Pin Pitch=5.0mm. Parallel Distance=27.4mm. ER42 high frequency transformer, with low magnetism leakage and good performance, we can start from samples.