AF257 Datasheet and Replacement

   Type Designator: AF257
   Material of Transistor: Ge
   Polarity: PNP
   Maximum Collector Power Dissipation (Pc): 0.03 W
   Maximum Collector-Base Voltage |Vcb|: 25 V
   Maximum Collector-Emitter Voltage |Vce|: 18 V
   Maximum Collector Current |Ic max|: 0.01 A
   Max. Operating Junction Temperature (Tj): 90 °C
   Transition Frequency (ft): 170 MHz
   Forward Current Transfer Ratio (hFE), MIN: 28
   Noise Figure, dB: -
   Package: U21
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