2SA1381 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -300 V
• Collector-Base Voltage, max: -300 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -0.1 A
• Collector Dissipation: 7 W
• DC Current Gain (h_fe): 40 to 320
• Transition Frequency, min: 150 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-126

Here is an image showing the pin diagram of this transistor.The 2SA1381 transistor can have a current gain of 40 to 320. The gain of the 2SA1381-C will be in the range from 40 to 80, for the 2SA1381-D it will be in the range from 60 to 120, for the 2SA1381-E it will be in the range from 100 to 200, for the 2SA1381-F it will be in the range from 160 to 320.Sometimes the "2S" prefix is not marked on the package - the 2SA1381 might only be marked "A1381".The complementary NPN transistor to the 2SA1381 is the 2SC3503.The PMBTA92 (SOT-23) is the SMD version of the 2SA1381 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SA1381 with the 2SA1353, 2SA1479, 2SA1480 or KSA1381.