2SC3951-C Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 70 V
• Collector-Base Voltage, max: 80 V
• Emitter-Base Voltage, max: 3 V
• Collector Current − Continuous, max: 0.3 A
• Collector Dissipation: 8 W
• DC Current Gain (h_fe): 40 to 80
• Transition Frequency, min: 600 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-126F

Here is an image showing the pin diagram of this transistor.The 2SC3951-C transistor can have a current gain of 40 to 80. The gain of the 2SC3951 will be in the range from 40 to 320, for the 2SC3951-D it will be in the range from 60 to 120, for the 2SC3951-E it will be in the range from 100 to 200, for the 2SC3951-F it will be in the range from 160 to 320.Sometimes the "2S" prefix is not marked on the package - the 2SC3951-C might only be marked "C3951-C".The complementary PNP transistor to the 2SC3951-C is the 2SA1536-C.You can replace the 2SC3951-C with the 2N4923, 2N4923G, 2N5192, 2N5192G, 2SC3599, 2SC3599-C, 2SC3952, 2SC3952-C, 2SC3954, 2SC3954-C, 2SD414, 2SD414-S, 2SD415, 2SD415-S, BD139, BD139-6, BD139G, BD169, BD179, BD230, BD237, BD237G, BD379, BD379-6, BD441, BD441G, BD789, BD791, MJE240, MJE241, MJE242, MJE243, MJE243G, MJE244, MJE722 or NTE184.