2SA1142 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -180 V
• Collector-Base Voltage, max: -180 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -0.1 A
• Collector Dissipation: 10 W
• DC Current Gain (h_fe): 100 to 320
• Transition Frequency, min: 180 MHz
• Noise Figure, max: 4 dB
• 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 2SA1142 transistor can have a current gain of 100 to 320. The gain of the 2SA1142P will be in the range from 160 to 320, for the 2SA1142Q it will be in the range from 100 to 200.Sometimes the "2S" prefix is not marked on the package - the 2SA1142 might only be marked "A1142".The complementary NPN transistor to the 2SA1142 is the 2SC2682.You can replace the 2SA1142 with the 2SA1210, 2SA1352, 2SA1353, 2SA1380, 2SA1381, 2SA1406, 2SA1407, 2SA1478, 2SA1479, 2SA1480, 2SA1540, 2SA1541, 2SA795A, 2SB1110, KSA1142 or KSA1381.