2SA1284 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -100 V
• Collector-Base Voltage, max: -100 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -0.5 A
• Collector Dissipation: 0.9 W
• DC Current Gain (h_fe): 55 to 300
• Transition Frequency, min: 130 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92MOD

Here is an image showing the pin diagram of this transistor.The 2SA1284 transistor can have a current gain of 55 to 300. The gain of the 2SA1284-C will be in the range from 55 to 110, for the 2SA1284-D it will be in the range from 90 to 180, for the 2SA1284-E it will be in the range from 150 to 300.Sometimes the "2S" prefix is not marked on the package - the 2SA1284 might only be marked "A1284".The complementary NPN transistor to the 2SA1284 is the 2SC3244.The 2SA1368 (SOT-89) is the SMD version of the 2SA1284 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.