2SA1541-D Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -200 V
• Collector-Base Voltage, max: -200 V
• Emitter-Base Voltage, max: -3 V
• Collector Current − Continuous, max: -0.2 A
• Collector Dissipation: 7 W
• DC Current Gain (h_fe): 60 to 120
• Transition Frequency, min: 300 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-126F

Here is an image showing the pin diagram of this transistor.The 2SA1541-D transistor can have a current gain of 60 to 120. The gain of the 2SA1541 will be in the range from 40 to 320, for the 2SA1541-C it will be in the range from 40 to 80, for the 2SA1541-E it will be in the range from 100 to 200, for the 2SA1541-F it will be in the range from 160 to 320.Sometimes the "2S" prefix is not marked on the package - the 2SA1541-D might only be marked "A1541-D".The complementary NPN transistor to the 2SA1541-D is the 2SC3956-D.The BST15 (SOT-89) is the SMD version of the 2SA1541-D transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SA1541-D with the 2SA1156, 2SA1156L, KSA1156, KSA1156O, KSE350, KTA1703, KTA1703-O, MJE350 or MJE350G.