2SC4550-K 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: 7 A
• Collector Dissipation: 30 W
• DC Current Gain (h_fe): 200 to 400
• Transition Frequency, min: 150 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 2SC4550-K transistor can have a current gain of 200 to 400. The gain of the 2SC4550 will be in the range from 100 to 400, for the 2SC4550-L it will be in the range from 150 to 300, for the 2SC4550-M it will be in the range from 100 to 200.Sometimes the "2S" prefix is not marked on the package - the 2SC4550-K might only be marked "C4550-K".The complementary PNP transistor to the 2SC4550-K is the 2SA1742-K.You can replace the 2SC4550-K with the 2SC4551, 2SC4551-K, 2SC4552, 2SC4552-K, BD203, BD303, BD535, BD537, BD543A, BD543B, BD543C, BD545A, BD545B, BD545C, BD797, BD799, BD801, BD807, BD809, BDT81, BDT81F, BDT83, BDT83F, BDT85, BDT85F, BDT87, BDT87F, BDX77, D44H11, D44H11FP, D44H8, MJE15028 or MJE15028G.