2SA499-Y Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -40 V
• Collector-Base Voltage, max: -50 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -0.1 A
• Collector Dissipation: 0.25 W
• DC Current Gain (h_fe): 100 to 200
• Transition Frequency, min: 250 MHz
• Operating and Storage Junction Temperature Range: -65 to +175 °C
• Package: TO-18

Here is an image showing the pin diagram of this transistor.The 2SA499-Y transistor can have a current gain of 100 to 200. The gain of the 2SA499 will be in the range from 60 to 200, for the 2SA499-O it will be in the range from 60 to 120.Sometimes the "2S" prefix is not marked on the package - the 2SA499-Y might only be marked "A499-Y".The complementary NPN transistor to the 2SA499-Y is the 2SC979-Y.The 2SA812 (SOT-23), 2SA812-M4 (SOT-23), KSA812 (SOT-23) and KSA812-O (SOT-23) is the SMD version of the 2SA499-Y transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SA499-Y with the 2N2907, 2N2907A, 2N3251, 2N3496, 2N4034, BC297, BCY70, BCY71 or NTE159M.