2SD1406 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: 25 W
• DC Current Gain (h_fe): 60 to 300
• Transition Frequency, min: 3 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-220F

Here is an image showing the pin diagram of this transistor.The 2SD1406 transistor can have a current gain of 60 to 300. The gain of the 2SD1406-G will be in the range from 150 to 300, for the 2SD1406-O it will be in the range from 60 to 120, for the 2SD1406-Y it will be in the range from 100 to 200.Sometimes the "2S" prefix is not marked on the package - the 2SD1406 might only be marked "D1406".The complementary PNP transistor to the 2SD1406 is the 2SB1015.You can replace the 2SD1406 with the 2SC1826, 2SC1985, 2SC1986, 2SC2075, 2SC3179, 2SC3851, 2SC3851A, 2SD1134, 2SD1274, 2SD1274A, 2SD1274B, 2SD1354, 2SD1761, 2SD313, 2SD613, 2SD823, 2SD880, BD203, BD241A, BD241B, BD241C, BD243A, BD243B, BD243C, BD303, BD535, BD537, BD539A, BD539B, BD539C, BD539D, BD543A, BD543B, BD543C, BD545A, BD545B, BD545C, BD797, BD799, BD801, BD807, BD809, BD949, BD951, BD953, BD955, BDT81, BDT81F, BDT83, BDT83F, BDT85, BDT85F, BDT87, BDT87F, BDX77, D44H11, D44H11FP, D44H8, KSD1406, KSD2058, KSD880, KTD1351, MJE15028, MJE15028G, TIP41D or TIP42D.