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ER39 Switching Power Transformer Vertical Bobbin22+22 pins vertical ER39 bobbin, high voltage ER39 transformer. Bobbin size=42.0mmX39.2mmX26.8mm, pin distance=5mm, parallel distance=35.0mm. We manufacture ER39 transformer for SMPS, used in DC converters, ER39 transformer has low magnetism leakage and good performance, we can start with small order.