2N1990

 Type Designator: 2N1990
   Material of Transistor: Si
   Polarity: NPN
   Maximum Collector Power Dissipation (Pc): 0.6 W
   Maximum Collector-Base Voltage |Vcb|: 100 V
   Maximum Collector-Emitter Voltage |Vce|: 60 V
   Maximum Emitter-Base Voltage |Veb|: 3 V
   Maximum Collector Current |Ic max|: 1 A
   Max. Operating Junction Temperature (Tj): 175 °C
   Transition Frequency (ft): 40 MHz
   Collector Capacitance (Cc): 20 pF
   Forward Current Transfer Ratio (hFE), MIN: 20
   Noise Figure, dB: -
   Package: TO5