2SD555-Q Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 200 V
• Collector-Base Voltage, max: 200 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 10 A
• Collector Dissipation: 200 W
• DC Current Gain (h_fe): 100 to 200
• Transition Frequency, min: 15 MHz
• Operating and Storage Junction Temperature Range: -65 to +150 °C
• Package: TO-3

Here is an image showing the pin diagram of this transistor.The 2SD555-Q transistor can have a current gain of 100 to 200. The gain of the 2SD555 will be in the range from 40 to 200, for the 2SD555-R it will be in the range from 60 to 120, for the 2SD555-S it will be in the range from 40 to 80.Sometimes the "2S" prefix is not marked on the package - the 2SD555-Q might only be marked "D555-Q".The complementary PNP transistor to the 2SD555-Q is the 2SB600-Q.You can replace the 2SD555-Q with the 2N6676, 2N6677, 2N6678, 2SC1586, 2SD746A, 2SD746A-Q, 2SD753, 2SD753-C, BUX48, BUX80, BUY69A, BUY69B, BUY69C, BUY70A, BUY70B, BUY70C, MJ10000 or MJ10001.