2SA949-O Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -150 V
• Collector-Base Voltage, max: -150 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -0.05 A
• Collector Dissipation: 0.8 W
• DC Current Gain (h_fe): 70 to 140
• Transition Frequency, min: 120 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 2SA949-O transistor can have a current gain of 70 to 140. The gain of the 2SA949 will be in the range from 70 to 240, for the 2SA949-Y it will be in the range from 120 to 240.Sometimes the "2S" prefix is not marked on the package - the 2SA949-O might only be marked "A949-O".The KTA1660 (SOT-89) and KTA1660O (SOT-89) is the SMD version of the 2SA949-O transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SA949-O with the 2N5401C, 2SA1013, 2SA1018, 2SA1018Q, 2SA1024, 2SA1024-O, 2SA1091, 2SA1091-O, 2SA1275, 2SA1370, 2SA1371, 2SA1624, 2SA1767, 2SA1767Q, 2SA879, 2SA879-Q, 2SB1221, 2SB1221-Q, BF421, BF423, HSB1109S, KSA1013, KSA709C, KSA709CO, KTA1024, KTA1024O, KTA1275 or KTA1279.