2SA1284-D 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): 90 to 180
• 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-D transistor can have a current gain of 90 to 180. The gain of the 2SA1284 will be in the range from 55 to 300, for the 2SA1284-C it will be in the range from 55 to 110, 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-D might only be marked "A1284-D".The complementary NPN transistor to the 2SA1284-D is the 2SC3244-D.The 2SA1368 (SOT-89) and 2SA1368-D (SOT-89) is the SMD version of the 2SA1284-D transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SA1284-D with the 2N5401C, 2SA1013, 2SA1275, 2SA965, 2SB647A, KSA1013, KSA709C, KSA916, KTA1023, KTA1023-O, KTA1023-Y or KTA1275.