BD231 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -80 V
• Collector-Base Voltage, max: -100 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -1.5 A
• Collector Dissipation: 12.5 W
• DC Current Gain (h_fe): 40 to 250
• Transition Frequency, min: 50 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 NPN transistor to the BD231 is the BD230.The BCP53 (SOT-223) is the SMD version of the BD231 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the BD231 with the BD140, BD140G, BD170, BD180, BD180G, BD238, BD238G, BD380, BD790, BD792, MJE252, MJE254 or MJE712.