2SD612K 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 320
• 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 transistor can have a current gain of 60 to 320. The gain of the 2SD612K-D will be in the range from 60 to 120, 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 might only be marked "D612K".The complementary PNP transistor to the 2SD612K is the 2SB632K.You can replace the 2SD612K with the 2SC1061, 2SC1418, 2SC1419, 2SC1826, 2SC1985, 2SC3179, 2SC3851, 2SD1133, 2SD1134, 2SD1761, 2SD1762, 2SD313, 2SD330, 2SD795, BD201, BD203, BD239, BD239A, BD241, BD241A, BD243, BD243A, BD301, BD303, BD533, BD535, BD539, BD539A, BD543, BD543A, BD545, BD545A, BD735, BD737, BD795, BD797, BD807, BD949, BDT81, BDT81F or D44H8.