2SD877 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 80 V
• Collector-Base Voltage, max: 110 V
• Emitter-Base Voltage, max: 7 V
• Collector Current − Continuous, max: 3 A
• Collector Dissipation: 25 W
• DC Current Gain (h_fe): 60 to 300
• Transition Frequency, min: 3 MHz
• Operating and Storage Junction Temperature Range: -65 to +150 °C
• Package: TO-66

Here is an image showing the pin diagram of this transistor.The 2SD877 transistor can have a current gain of 60 to 300. The gain of the 2SD877-GR will be in the range from 150 to 300, for the 2SD877-O it will be in the range from 60 to 120, for the 2SD877-Y it will be in the range from 100 to 200.Sometimes the "2S" prefix is not marked on the package - the 2SD877 might only be marked "D877".The complementary PNP transistor to the 2SD877 is the 2SB502A.The BDP953 (SOT-223) is the SMD version of the 2SD877 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SD877 with the 2SC1113.