ウェブ1 日前 · I'd recommend going with a 470 Ω resistor -- that drives you a bit further into saturation and is also a very common resistor value. It would yield an expected base current of around 5 mA. Ib*Vbe + Ic*Vce = 5 mA * 0.8 V + 200 mA * 50 mV = 14 mW, which is should only produce a few degrees temperature rise in the junction.
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