2SC2078B 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): 25 to 50
• 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 2SC2078B transistor can have a current gain of 25 to 50. The gain of the 2SC2078 will be in the range from 25 to 200, for the 2SC2078C it will be in the range from 40 to 80, for the 2SC2078D it will be in the range from 60 to 120, for the 2SC2078E it will be in the range from 100 to 200.Sometimes the "2S" prefix is not marked on the package - the 2SC2078B might only be marked "C2078B".You can replace the 2SC2078B with the 2N6100, 2N6101, 2N6123, 2N6131, 2N6473, 2N6474, 2N6488, 2N6488G, 2SC2075, 2SD1274, 2SD1274A, 2SD1274B, 2SD772, 2SD792, 2SD823, BD241B, BD241C, BD709, BD711, BD743B, BD743C, BD909, BD911, BDT31B, BDT31C, BDT41B, BDT41BF, BDT41C, BDT41CF, BDT93, BDT93F, BDT95, BDT95F, MJE5180, MJE5181, MJF3055, MJF3055G, MJF31C, MJF31CG, NTE291, TIP31B, TIP31BG, TIP31C, TIP31CF, TIP31CG, TIP31D, TIP31E, TIP41B, TIP41BG, TIP41C, TIP41CF, TIP41CG, TIP41D, TIP41E, TIP42D or TIP42E.