2SD612K-D Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 35 V
• Collector-Base Voltage, max: 35 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 2 A
• Collector Dissipation: 10 W
• DC Current Gain (h_fe): 60 to 120
• Transition Frequency, min: 100 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-220

Here is an image showing the pin diagram of this transistor.The 2SD612K-D transistor can have a current gain of 60 to 120. The gain of the 2SD612K will be in the range from 60 to 320, for the 2SD612K-E it will be in the range from 100 to 200, for the 2SD612K-F it will be in the range from 160 to 320.Sometimes the "2S" prefix is not marked on the package - the 2SD612K-D might only be marked "D612K-D".The complementary PNP transistor to the 2SD612K-D is the 2SB632K-D.You can replace the 2SD612K-D with the 2N5293, 2N5294, 2N5295, 2N5296, 2N6290, 2N6290G, 2N6291, 2N6292, 2N6292G, 2N6293, 2N6486, 2N6486G, 2N6487, 2N6487G, 2SC1061, 2SC1061-B, 2SC1398, 2SC1398A, 2SC1418, 2SC1418-B, 2SC1419, 2SC1419-B, 2SC1826, 2SC1985, 2SC2233, 2SC3179, 2SC3851, 2SC789, 2SC790, 2SD1133, 2SD1133-B, 2SD1134, 2SD1134-B, 2SD1265, 2SD1267, 2SD1354, 2SD1354-O, 2SD1406, 2SD1406-O, 2SD1444A, 2SD1444A-R, 2SD1568, 2SD1588, 2SD1761, 2SD1761-D, 2SD1762, 2SD1762D, 2SD2058, 2SD2058-O, 2SD234, 2SD235, 2SD288, 2SD313, 2SD313D, 2SD330, 2SD330D, 2SD362, 2SD389, 2SD476, 2SD476-B, 2SD476A, 2SD476A-B, 2SD568, 2SD568-L, 2SD795, 2SD795-R, 2SD856, 2SD857, 2SD880, 2SD880O, BD201, BD203, BD239, BD239A, BD241, BD241A, BD243, BD243A, BD301, BD303, BD533, BD535, BD539, BD539A, BD543, BD543A, BD545, BD545A, BD705, BD707, BD735, BD737, BD743, BD743A, BD795, BD797, BD807, BD905, BD907, BD933, BD933F, BD935, BD935F, BD949, BDT81, BDT81F, BDT91, BDT91F, D44H8, KSD1406, KSD1406-O, KSD1588, KSD2058, KSD2058-O, KSD288, KSD362, KSD568, KSD568-O, KSD880, KSD880-O, KTC1003, KTD1351, KTD1351O, KTD2058, KTD2058O or NTE196.