2SD666A-C Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 100 V
• Collector-Base Voltage, max: 120 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 0.05 A
• Collector Dissipation: 0.9 W
• DC Current Gain (h_fe): 100 to 200
• Transition Frequency, min: 140 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92MOD

Here is an image showing the pin diagram of this transistor.The 2SD666A-C transistor can have a current gain of 100 to 200. The gain of the 2SD666A will be in the range from 60 to 200, for the 2SD666A-B it will be in the range from 60 to 120.Sometimes the "2S" prefix is not marked on the package - the 2SD666A-C might only be marked "D666A-C".The complementary PNP transistor to the 2SD666A-C is the 2SB646A-C.You can replace the 2SD666A-C with the 2N5551C, 2SC1473, 2SC1473R, 2SC1573, 2SC1573-R, 2SC2229, 2SC2235, 2SC2363, 2SC2363E, 2SC2383, 2SC2383O, 2SC2705, 2SC2909, 2SC2909-R, 2SC2910, 2SC2910-R, 2SC3206, 2SC3228, 2SC3228-O, 2SC3244, 2SC3332, 2SC3332-R, 2SC3467, 2SC3467-E, 2SD667A, 2SD667AC, 2SD668A, 2SD668A-C, HSD1609S, HSD1609S-C, KSC1009C, KSC2310, KSC2316, KSC2383, KSC2383O, KTC1027, KTC1027-O, KTC1027-Y, KTC3206, KTC3228 or KTC3228O.