2SD1894 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 140 V
• Collector-Base Voltage, max: 160 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 7 A
• Collector Dissipation: 70 W
• DC Current Gain (h_fe): 5000 to 30000
• Transition Frequency, min: 20 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-3PF

Here is an image showing the pin diagram of this transistor.The 2SD1894 transistor can have a current gain of 5000 to 30000. The gain of the 2SD1894-P will be in the range from 5000 to 15000, for the 2SD1894-Q it will be in the range from 8000 to 30000.Sometimes the "2S" prefix is not marked on the package - the 2SD1894 might only be marked "D1894".The complementary PNP transistor to the 2SD1894 is the 2SB1254.You can replace the 2SD1894 with the 2SD1895.