2SD1668-S Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 50 V
• Collector-Base Voltage, max: 60 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 7 A
• Collector Dissipation: 30 W
• DC Current Gain (h_fe): 140 to 280
• Transition Frequency, min: 10 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 2SD1668-S transistor can have a current gain of 140 to 280. The gain of the 2SD1668 will be in the range from 70 to 280, for the 2SD1668-Q it will be in the range from 70 to 140, for the 2SD1668-R it will be in the range from 100 to 200.Sometimes the "2S" prefix is not marked on the package - the 2SD1668-S might only be marked "D1668-S".The complementary PNP transistor to the 2SD1668-S is the 2SB1135-S.You can replace the 2SD1668-S with the 2SC3254, 2SC3254-S, 2SC3255, 2SC3255-S, 2SC3747, 2SC3747-S, 2SC3748, 2SC3748-S, 2SC4550, 2SC4551, 2SC4552, 2SD1061, 2SD1061-S, 2SD1062, 2SD1062-S, 2SD1669, 2SD1669-S, BD203, BD303, BD535, BD537, BD543A, BD543B, BD543C, BD545A, BD545B, BD545C, BD797, BD799, BD801, BD807, BD809, BDT81, BDT81F, BDT83, BDT83F, BDT85, BDT85F, BDX77, D44H11, D44H11FP or D44H8.