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ER29 Vertical High Frequency Transformer 5+4 Pins BobbinER29 5+4 pins transformer bobbin. Vertical ER29 bobbin. Parallel Distance=17.5mm. Pin Pitch=5.0mm. Bobbin Size=24.8mmX22.8mmX16.65mm. DIP transformer bobbin. We can make new bobbin tooling to meet different requirements. UL REC:94V-0.