2SD552 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 180 V
• Collector-Base Voltage, max: 220 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 15 A
• Collector Dissipation: 150 W
• DC Current Gain (h_fe): 25 to 80
• Transition Frequency, min: 4 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 2SD552 transistor can have a current gain of 25 to 80. The gain of the 2SD552-DN will be in the range from 25 to 50, for the 2SD552-R it will be in the range from 40 to 80.Sometimes the "2S" prefix is not marked on the package - the 2SD552 might only be marked "D552".The complementary PNP transistor to the 2SD552 is the 2SB552.You can replace the 2SD552 with the 2N6676 or 2N6677.