2SD1668-R 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): 100 to 200
• 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-R transistor can have a current gain of 100 to 200. 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-S it will be in the range from 140 to 280.Sometimes the "2S" prefix is not marked on the package - the 2SD1668-R might only be marked "D1668-R".The complementary PNP transistor to the 2SD1668-R is the 2SB1135-R.You can replace the 2SD1668-R with the 2SC2334, 2SC3254, 2SC3254-R, 2SC3255, 2SC3255-R, 2SC3345, 2SC3346, 2SC3709, 2SC3709A, 2SC3710, 2SC3710A, 2SC3747, 2SC3747-R, 2SC3748, 2SC3748-R, 2SC4550, 2SC4550-M, 2SC4551, 2SC4551-M, 2SC4552, 2SC4552-M, 2SD1061, 2SD1061-R, 2SD1062, 2SD1062-R, 2SD1271, 2SD1362, 2SD1363, 2SD1411, 2SD1411A, 2SD1412, 2SD1588, 2SD1588-K, 2SD1669, 2SD1669-R, 2SD553, 2SD568, 2SD568-K, 2SD569, 2SD569-K, 2SD866, 2SD866A, BD203, BD303, BD535, BD537, BD543A, BD543B, BD543C, BD545A, BD545B, BD545C, BD797, BD799, BD801, BD807, BD809, BDT81, BDT81F, BDT83, BDT83F, BDT85, BDT85F, BDT91, BDT91F, BDT93, BDT93F, BDT95, BDT95F, BDX77, D44H11, D44H11FP, D44H8, KSC2334, KSD1588, KSD1588-Y, KSD568, KSD568-Y, KSD569 or KSD569-Y.