2SD669 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 120 V
• Collector-Base Voltage, max: 180 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 1.5 A
• Collector Dissipation: 20 W
• DC Current Gain (h_fe): 60 to 320
• Transition Frequency, min: 140 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-126

Here is an image showing the pin diagram of this transistor.The 2SD669 transistor can have a current gain of 60 to 320. The gain of the 2SD669-B will be in the range from 60 to 120, for the 2SD669-C it will be in the range from 100 to 200, for the 2SD669-D it will be in the range from 160 to 320.Sometimes the "2S" prefix is not marked on the package - the 2SD669 might only be marked "D669".The complementary PNP transistor to the 2SD669 is the 2SB649.You can replace the 2SD669 with the 2SC2481.