The TIP31C is a base island technology NPN power transistor in TO-220 plastic package with better performances than the industry standard TIP31C that make this device suitable for audio, power linear and switching applications. The PNP type is TIP32C.
The 2SC3209 is a NPN Maximum Collector 2W Maximum Collector Base Voltage 300 V Maximum Collector Current 0.2 A Max. Operating Junction Temperature 125 °C Transition Frequency 80 MHz Forward Current Transfer Ratio 60.