BD129 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 350 V
• Collector-Base Voltage, max: 400 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 0.5 A
• Collector Dissipation: 17.5 W
• DC Current Gain (h_fe): 30
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-126

Here is an image showing the pin diagram of this transistor.The PBHV8540T (SOT-23), PBHV8540X (SOT-89), PBHV8540Z (SOT-223) and PMBTA44 (SOT-23) is the SMD version of the BD129 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the BD129 with the 2N5657, 2N5657G, 2SC2752K, 2SC2752L, BD159, BUX86, BUX87, KSC2752O, KSC2752Y or KSE5020-Y.