2SD877-Y 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): 100 to 200
• 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-Y transistor can have a current gain of 100 to 200. The gain of the 2SD877 will be in the range from 60 to 300, for the 2SD877-GR it will be in the range from 150 to 300, for the 2SD877-O it will be in the range from 60 to 120.Sometimes the "2S" prefix is not marked on the package - the 2SD877-Y might only be marked "D877-Y".The complementary PNP transistor to the 2SD877-Y is the 2SB502A-Y.The BDP953 (SOT-223) is the SMD version of the 2SD877-Y transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SD877-Y with the 2N5428, 2N5430 or 2SC1113.