BDX43 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 60 V
• Collector-Base Voltage, max: 80 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 1 A
• Collector Dissipation: 5 W
• DC Current Gain (h_fe): 1000
• Transition Frequency, min: 200 MHz
• Operating and Storage Junction Temperature Range: -65 to +150 °C
• Package: TO-126

Here is an image showing the pin diagram of this transistor.The complementary PNP transistor to the BDX43 is the BDX46.The BSP51 (SOT-223) is the SMD version of the BDX43 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the BDX43 with the 2SD1509, 2SD1692, 2SD1692-K, 2SD1692-L, 2SD1692-M, 2SD985, 2SD985-K, 2SD985-L, 2SD985-M, 2SD986, 2SD986-K, 2SD986-L, 2SD986-M, BD877, BD879, BDX44, KSB985, KSB985-O, KSB985-R, KSB985-Y, KSB986, KSB986-O, KSB986-R, KSB986-Y, KSD1692, KSD1692-G, KSD1692-O, KSD1692-Y, MJE270 or MJE270G.