2SD1220 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 150 V
• Collector-Base Voltage, max: 150 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 1.5 A
• Collector Dissipation: 10 W
• DC Current Gain (h_fe): 60 to 320
• Transition Frequency, min: 100 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-251

Here is an image showing the pin diagram of this transistor.The 2SD1220 transistor can have a current gain of 60 to 320. The gain of the 2SD1220-O will be in the range from 100 to 200, for the 2SD1220-R it will be in the range from 60 to 120, for the 2SD1220-Y it will be in the range from 160 to 320.Sometimes the "2S" prefix is not marked on the package - the 2SD1220 might only be marked "D1220".The complementary PNP transistor to the 2SD1220 is the 2SB905.The FMMT625 (SOT-23) is the SMD version of the 2SD1220 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.