TN4257 Datasheet and Replacement

   Type Designator: TN4257
   Material of Transistor: Si
   Polarity: NPN
   Maximum Collector Power Dissipation (Pc): 0.35 W
   Maximum Collector-Base Voltage |Vcb|: 12 V
   Maximum Collector-Emitter Voltage |Vce|: 12 V
   Maximum Emitter-Base Voltage |Veb|: 4 V
   Maximum Collector Current |Ic max|: 0.1 A
   Max. Operating Junction Temperature (Tj): 150 °C
   Transition Frequency (ft): 700 MHz
   Collector Capacitance (Cc): 3 pF
   Forward Current Transfer Ratio (hFE), MIN: 30
   Noise Figure, dB: -
   Package: TO92
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