2SC2078D Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 75 V
• Collector-Base Voltage, max: 80 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 3 A
• Collector Dissipation: 10 W
• DC Current Gain (h_fe): 60 to 120
• 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 2SC2078D transistor can have a current gain of 60 to 120. The gain of the 2SC2078 will be in the range from 25 to 200, for the 2SC2078B it will be in the range from 25 to 50, for the 2SC2078C it will be in the range from 40 to 80, for the 2SC2078E it will be in the range from 100 to 200.Sometimes the "2S" prefix is not marked on the package - the 2SC2078D might only be marked "C2078D".The BDP951 (SOT-223) is the SMD version of the 2SC2078D transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SC2078D with the 2N6473, 2N6474, 2N6488, 2N6488G, 2SC1827, 2SC1986, 2SC2075, 2SC2334, 2SC2527, 2SC3851A, 2SC4511, 2SC4512, 2SD1265A, 2SD1267A, 2SD1268, 2SD1268-R, 2SD1269, 2SD1269-R, 2SD1270, 2SD1270-R, 2SD1271, 2SD1271-R, 2SD1274, 2SD1274A, 2SD1274B, 2SD1355, 2SD1356, 2SD1407, 2SD1407A, 2SD1408, 2SD2059, 2SD2060, 2SD363, 2SD389A, 2SD525, 2SD526, 2SD569, 2SD569-L, 2SD613, 2SD613-D, 2SD743, 2SD743-R, 2SD743A, 2SD743A-R, 2SD772, 2SD792, 2SD812, 2SD812-Q, 2SD823, 2SD856A, 2SD857A, 2SD866, 2SD866-R, 2SD866A, 2SD866A-R, BD241B, BD241C, BD243B, BD243C, BD537, BD539B, BD539C, BD539D, BD543B, BD543C, BD545B, BD545C, BD709, BD711, BD743B, BD743C, BD799, BD801, BD809, BD909, BD911, BD937, BD937F, BD939, BD939F, BD941, BD941F, BD951, BD953, BD955, BDT83, BDT83F, BDT85, BDT85F, BDT87, BDT87F, BDT93, BDT93F, BDT95, BDT95F, BDX77, D44H11, D44H11FP, KSC2334, KSD1408, KSD363, KSD526, KSD569, KSD569-O, KTD2059, KTD2060, MJE15028, MJE15028G, MJE15030, MJE15030G, MJF15030, MJF15030G, NTE152, NTE291, TIP41D, TIP41E, TIP42D or TIP42E.