BC847 is NPN RF Transistor. It comes in SOT-323 package. Its current gain rating is 180 and voltage rating is 45V.
Part StatusActiveTransistor TypeNPNCurrent - Collector (Ic) (Max)100mAVoltage - Coll..
BD139 is a medium-power NPN transistor; designed for use as audio amplifiers and drivers utilizing complementary or quasi complementary circuits. It comes in plastic casing. Its DC current gain is 40 ..
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