2SD1223 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 80 V
• Collector-Base Voltage, max: 100 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 4 A
• Collector Dissipation: 15 W
• DC Current Gain (h_fe): 2000
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-252

Here is an image showing the pin diagram of this transistor.Sometimes the "2S" prefix is not marked on the package - the 2SD1223 might only be marked "D1223".The complementary PNP transistor to the 2SD1223 is the 2SB908.You can replace the 2SD1223 with the 2SD1261A-P, 2SD1261A-Q, 2SD1262A-P or 2SD1262A-Q.