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Is it OK to connect bipolar transistors in parallel?

Yes, provided that the base terminals of all parallel transistors are equally biased. Insert current balance resistors as shown below and use transistors with the same part number and hFE rank. If two bipolar transistors with different part numbers or hFE ranks are connected in parallel, most of the current flows to one of the transistors, possibly damaging it permanently. For power transistors, uniform heat dissipation is also important.

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