2N3583 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 175 V
• Collector-Base Voltage, max: 200 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 1 A
• Collector Dissipation: 35 W
• DC Current Gain (h_fe): 40 to 200
• Operating and Storage Junction Temperature Range: -65 to +200 °C
• Package: TO-66

Here is an image showing the pin diagram of this transistor.The complementary PNP transistor to the 2N3583 is the 2N6420.The KST43 (SOT-23) is the SMD version of the 2N3583 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2N3583 with the 2N3738 or 2N3739.