MJ421S Datasheet and Replacement

   Type Designator: MJ421S
   Material of Transistor: Si
   Polarity: NPN
   Maximum Collector Power Dissipation (Pc): 0.8 W
   Maximum Collector-Base Voltage |Vcb|: 350 V
   Maximum Collector-Emitter Voltage |Vce|: 325 V
   Maximum Emitter-Base Voltage |Veb|: 6 V
   Maximum Collector Current |Ic max|: 0.1 A
   Max. Operating Junction Temperature (Tj): 175 °C
   Transition Frequency (ft): 15 MHz
   Collector Capacitance (Cc): 12 pF
   Forward Current Transfer Ratio (hFE), MIN: 25
   Noise Figure, dB: -
   Package: TO39
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