KSD1408 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 80 V
• Collector-Base Voltage, max: 80 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 4 A
• Collector Dissipation: 25 W
• DC Current Gain (h_fe): 40 to 240
• Transition Frequency, min: 8 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-220F
• Electrically Similar to the Popular 2SD1408 transistor

Here is an image showing the pin diagram of this transistor.The KSD1408 transistor can have a current gain of 40 to 240. The gain of the KSD1408-O will be in the range from 70 to 140, for the KSD1408-R it will be in the range from 40 to 80, for the KSD1408-Y it will be in the range from 120 to 240.The complementary PNP transistor to the KSD1408 is the KSB1017.The BDP951 (SOT-223) is the SMD version of the KSD1408 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the KSD1408 with the 2SC1986, 2SC2075, 2SC2334, 2SC3851A, 2SD1267A, 2SD1274, 2SD1274A, 2SD1274B, 2SD1355, 2SD1356, 2SD1407, 2SD1407A, 2SD1408, 2SD2059, 2SD2060, 2SD363, 2SD525, 2SD526, 2SD613, 2SD772, 2SD792, 2SD823, 2SD857A, BD243B, BD243C, BD537, BD539B, BD539C, BD539D, BD799, BD801, BD809, BD951, BD953, BD955, BDT83, BDT83F, BDT85, BDT85F, BDT87, BDT87F, BDX77, KSC2334, KSD363, KSD526, KTD2059, KTD2060, MJE15028, MJE15028G, MJE15030, MJE15030G, MJF15030, MJF15030G, TIP41D, TIP41E, TIP41F, TIP42D, TIP42E or TIP42F.