KT3107K The structure of p-n-p The maximum allowable (pulse) the collector-base 20 The maximum allowable (pulse) collector-emitter voltage 25 V The maximum permissible continuous (pulse) 100 collector current (200 mA) The maximum allowable continuous power dissipation without heat collector (with heatsink) 0.3W current transfer ratio of b ipolar transistor in the common-emitter 380-800 Reverse collector current <= 0.1 mA Cutoff frequency of the current transfer ratio in the common-emitter = > 200 MHz The noise figure of the bipolar transistor <= 4 dB