KSD1021-G Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 30 V
• Collector-Base Voltage, max: 40 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 1 A
• Collector Dissipation: 0.35 W
• DC Current Gain (h_fe): 200 to 400
• Transition Frequency, min: 130 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92S

Here is an image showing the pin diagram of this transistor.The KSD1021-G transistor can have a current gain of 200 to 400. The gain of the KSD1021 will be in the range from 120 to 400, for the KSD1021-Y it will be in the range from 120 to 240.The complementary PNP transistor to the KSD1021-G is the KSB811-G.You can replace the KSD1021-G with the 2SC2500, 2SC2500-A, 2SC2500-B, 2SC2500-C, 2SC2500-D, 2SC4408, 2SC4604, 2SD1207, 2SD1207-T, 2SD1347, 2SD1347T, 2SD1616, 2SD1616-K, 2SD1616A, 2SD1616A-K, 2SD1835, 2SD1835-T, 2SD789, KSC2500, KSC2500-A, KSC2500-B, KSC2500-C, KSC2500-D, KSC5019, KSD1616, KSD1616-G, KSD1616A, KSD1616A-G, KSD471AC or KSD471ACG.