2SD1212 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 30 V
• Collector-Base Voltage, max: 60 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 12 A
• Collector Dissipation: 35 W
• DC Current Gain (h_fe): 70 to 280
• Transition Frequency, min: 120 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-220

Here is an image showing the pin diagram of this transistor.The 2SD1212 transistor can have a current gain of 70 to 280. The gain of the 2SD1212-Q will be in the range from 70 to 140, for the 2SD1212-R it will be in the range from 100 to 200, for the 2SD1212-S it will be in the range from 140 to 280.Sometimes the "2S" prefix is not marked on the package - the 2SD1212 might only be marked "D1212".The complementary PNP transistor to the 2SD1212 is the 2SB903.You can replace the 2SD1212 with the 2SD1062, 2SD1669, BD545, BD545A, BDT81 or BDT81F.