2SA1244-O Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -50 V
• Collector-Base Voltage, max: -60 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -5 A
• Collector Dissipation: 20 W
• DC Current Gain (h_fe): 70 to 140
• Transition Frequency, min: 60 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 2SA1244-O transistor can have a current gain of 70 to 140. The gain of the 2SA1244 will be in the range from 70 to 240, for the 2SA1244-Y it will be in the range from 120 to 240.Sometimes the "2S" prefix is not marked on the package - the 2SA1244-O might only be marked "A1244-O".The complementary NPN transistor to the 2SA1244-O is the 2SC3074-O.You can replace the 2SA1244-O with the KTA1042D or KTA1042D-O.