2SD1212-R 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): 100 to 200
• 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-R transistor can have a current gain of 100 to 200. The gain of the 2SD1212 will be in the range from 70 to 280, for the 2SD1212-Q it will be in the range from 70 to 140, 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-R might only be marked "D1212-R".The complementary PNP transistor to the 2SD1212-R is the 2SB903-R.You can replace the 2SD1212-R with the 2SC3345, 2SC3709, 2SC3709A, 2SC4552, 2SC4552-M, 2SD1062, 2SD1062-R, 2SD1669, 2SD1669-R, BD545, BD545A, BDT81 or BDT81F.