ST4081 Datasheet and Replacement

   Type Designator: ST4081
   Material of Transistor: Si
   Polarity: NPN
   Maximum Collector Power Dissipation (Pc): 3 W
   Maximum Collector-Base Voltage |Vcb|: 125 V
   Maximum Collector-Emitter Voltage |Vce|: 125 V
   Maximum Emitter-Base Voltage |Veb|: 3 V
   Maximum Collector Current |Ic max|: 0.1 A
   Max. Operating Junction Temperature (Tj): 200 °C
   Transition Frequency (ft): 10 MHz
   Collector Capacitance (Cc): 10 pF
   Forward Current Transfer Ratio (hFE), MIN: 20
   Noise Figure, dB: -
   Package: TO26
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