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ATQ21 High Frequency Transformer Vertical BobbinVertical ATQ21 transformer bobbin, single slot ATQ21 bobbin 5+0pins. Bobbin Size=19.40mmX18.0mmX15.9mm. Pin distance=3.50mm. PM9630 material ATQ21 bobbin. We are bobbin factory, we have various Injection tooling, plant pin tooling, we can manufacture final transformers.