2SA900 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -18 V
• Collector-Base Voltage, max: -20 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -1 A
• Collector Dissipation: 1.2 W
• DC Current Gain (h_fe): 90 to 470
• Transition Frequency, min: 200 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 2SA900 transistor can have a current gain of 90 to 470. The gain of the 2SA900-Q will be in the range from 90 to 155, for the 2SA900-R it will be in the range from 130 to 210, for the 2SA900-S it will be in the range from 180 to 280, for the 2SA900-T it will be in the range from 250 to 360, for the 2SA900-U it will be in the range from 330 to 470.Sometimes the "2S" prefix is not marked on the package - the 2SA900 might only be marked "A900".The complementary NPN transistor to the 2SA900 is the 2SC1568.You can replace the 2SA900 with the BD186 or MJE370.