2SD1253-P Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 60 V
• Collector-Base Voltage, max: 60 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 4 A
• Collector Dissipation: 40 W
• DC Current Gain (h_fe): 120 to 250
• Transition Frequency, min: 20 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-252

Here is an image showing the pin diagram of this transistor.The 2SD1253-P transistor can have a current gain of 120 to 250. The gain of the 2SD1253 will be in the range from 40 to 250, for the 2SD1253-Q it will be in the range from 70 to 150, for the 2SD1253-R it will be in the range from 40 to 90.Sometimes the "2S" prefix is not marked on the package - the 2SD1253-P might only be marked "D1253-P".The complementary PNP transistor to the 2SD1253-P is the 2SB930-P.The BDP949 (SOT-223) is the SMD version of the 2SD1253-P transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SD1253-P with the 2SD1253A, 2SD1253A-P, 2SD1255, 2SD1256, 2SD1257 or 2SD1257A.