2SD1717 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 160 V
• Collector-Base Voltage, max: 160 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 12 A
• Collector Dissipation: 120 W
• DC Current Gain (h_fe): 60 to 200
• Transition Frequency, min: 20 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-3P

Here is an image showing the pin diagram of this transistor.The 2SD1717 transistor can have a current gain of 60 to 200. The gain of the 2SD1717-P will be in the range from 100 to 200, for the 2SD1717-Q it will be in the range from 60 to 120, for the 2SD1717-S it will be in the range from 80 to 160.Sometimes the "2S" prefix is not marked on the package - the 2SD1717 might only be marked "D1717".The complementary PNP transistor to the 2SD1717 is the 2SB1162.You can replace the 2SD1717 with the 2SD1718, MJW3281A or MJW3281AG.