KTC2020D Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 60 V
• Collector-Base Voltage, max: 60 V
• Emitter-Base Voltage, max: 7 V
• Collector Current − Continuous, max: 3 A
• Collector Dissipation: 20 W
• DC Current Gain (h_fe): 100 to 300
• Transition Frequency, min: 30 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-252

Here is an image showing the pin diagram of this transistor.The KTC2020D transistor can have a current gain of 100 to 300. The gain of the KTC2020D-GR will be in the range from 150 to 300, for the KTC2020D-Y it will be in the range from 100 to 200.The complementary PNP transistor to the KTC2020D is the KTA1040D.The BDP949 (SOT-223) is the SMD version of the KTC2020D transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the KTC2020D with the 2SD1221.