2SC3955-D Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 200 V
• Collector-Base Voltage, max: 200 V
• Emitter-Base Voltage, max: 3 V
• Collector Current − Continuous, max: 0.1 A
• Collector Dissipation: 7 W
• DC Current Gain (h_fe): 60 to 120
• Transition Frequency, min: 300 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 2SC3955-D transistor can have a current gain of 60 to 120. The gain of the 2SC3955 will be in the range from 40 to 320, for the 2SC3955-C it will be in the range from 40 to 80, for the 2SC3955-E it will be in the range from 100 to 200, for the 2SC3955-F it will be in the range from 160 to 320.Sometimes the "2S" prefix is not marked on the package - the 2SC3955-D might only be marked "C3955-D".The complementary PNP transistor to the 2SC3955-D is the 2SA1540-D.The BF622 (SOT-89) and BF822 (SOT-23) is the SMD version of the 2SC3955-D transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SC3955-D with the 2N5655, 2N5655G, 2N5656, 2N5656G, 2N5657, 2N5657G, 2SC2258, 2SC2688, 2SC2688-M, 2SC2899, 2SC3416, 2SC3416-D, 2SC3417, 2SC3417-D, 2SC3502, 2SC3502-D, 2SC3503, 2SC3503-D, 2SC3600, 2SC3600-D, 2SC3601, 2SC3601-D, 2SC3788, 2SC3788-D, 2SC3789, 2SC3789-D, 2SC3790, 2SC3790-D, 2SC3956, 2SC3956-D, 2SC4212, 2SD1610, 2SD1610-B, BD127, BD128, BD129, BD157, BD158, BD159, BD410, BUX86, KSC2258, KSC2258A, KSC2688, KSC2688-O, KSC3502, KSC3502-D, KSC3503, KSC3503-D, KSE340, MJE340, MJE340G, MJE3439, MJE3439G, MJE344, MJE3440 or MJE344G.