The KSC1845 is a NPN type transistor manufactured by Fairchild Semiconductor Corporation. Its maximum collector-base voltage is 120V, maximum collector-emitter voltage is 120V, maximum emitter-base voltage is 5V, maximum collector current is 50mA, maximum base current is 10mA, maximum collector power dissipation is 500mW, and maximum junction temperature is 150°C. Storage temperature range is -55~150°C.