2SC4551 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 60 V
• Collector-Base Voltage, max: 100 V
• Emitter-Base Voltage, max: 7 V
• Collector Current − Continuous, max: 10 A
• Collector Dissipation: 30 W
• DC Current Gain (h_fe): 100 to 400
• Transition Frequency, min: 140 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 2SC4551 transistor can have a current gain of 100 to 400. The gain of the 2SC4551-K will be in the range from 200 to 400, for the 2SC4551-L it will be in the range from 150 to 300, for the 2SC4551-M it will be in the range from 100 to 200.Sometimes the "2S" prefix is not marked on the package - the 2SC4551 might only be marked "C4551".The complementary PNP transistor to the 2SC4551 is the 2SA1743.You can replace the 2SC4551 with the 2SC4552, BD545A, BD545B, BD545C, BD807, BD809, BDT81, BDT81F, BDT83, BDT83F, BDT85, BDT85F, BDT87, BDT87F, D44H11, D44H11FP or D44H8.