2SD1668-Q 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): 70 to 140
• 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-Q transistor can have a current gain of 70 to 140. The gain of the 2SD1668 will be in the range from 70 to 280, for the 2SD1668-R it will be in the range from 100 to 200, 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-Q might only be marked "D1668-Q".The complementary PNP transistor to the 2SD1668-Q is the 2SB1135-Q.You can replace the 2SD1668-Q with the 2N6290, 2N6290G, 2N6291, 2N6292, 2N6292G, 2N6293, 2N6487, 2N6487G, 2N6488, 2N6488G, 2SC2334, 2SC2334L, 2SC3254, 2SC3254-Q, 2SC3255, 2SC3255-Q, 2SC3345, 2SC3345-O, 2SC3346, 2SC3346-O, 2SC3709, 2SC3709-O, 2SC3709A, 2SC3709A-O, 2SC3710, 2SC3710-O, 2SC3710A, 2SC3710A-O, 2SC3747, 2SC3747-Q, 2SC3748, 2SC3748-Q, 2SD1061, 2SD1061-Q, 2SD1062, 2SD1062-Q, 2SD1271, 2SD1362, 2SD1362-O, 2SD1363, 2SD1363-O, 2SD1411, 2SD1411-O, 2SD1411A, 2SD1411A-O, 2SD1412, 2SD1412-O, 2SD1588, 2SD1669, 2SD1669-Q, 2SD553, 2SD553-O, 2SD568, 2SD569, 2SD866, 2SD866A, BD203, BD303, BD535, BD537, BD543A, BD543B, BD543C, BD545A, BD545B, BD545C, BD707, BD709, BD711, BD743A, BD743B, BD743C, BD797, BD799, BD801, BD807, BD809, BD907, BD909, BD911, BDT81, BDT81F, BDT83, BDT83F, BDT85, BDT85F, BDT91, BDT91F, BDT93, BDT93F, BDT95, BDT95F, BDX77, D44H11, D44H11FP, D44H8, KSC2334, KSC2334O, KSD1588, KSD568, KSD569 or NTE196.