2SC4957-A

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2SC4957-A is a RF power RF bipolar transistor manufactured by Toshiba, designed for applications such as automotive, consumer electronics and communication, industrial markets, and other applications in the radio frequency (RF) industry. It is ideal for amplifying signals in the radio band, and its maximum frequency range is 250 MHz to 800 MHz.

The 2SC4957-A includes 3 pins, a collector, a base, and an emitter. It is available in a TO-252 package and is a type of NPN type bipolar junction transistor. It’s current gain is typically 10A, and its power dissipation is 0.5W, with a collector current of 0.12A.

Working Principle

The 2SC4957-A works on the same principle as all other transistors, wherein current is allowed to flow through a small region surrounded by two other regions that carry the opposite charge of current. This transistor has three layers: an emitter, a collector and a base, which serves as a switch to regulate current flow. The collector and emitter are connected via a third region, known as the base. The charge of the base can be altered using a voltage through a mechanical contact, which acts like a switch that regulates current flow. When the electrical current flows through the base, it can absorb or emit electrons, thus allowing current to flow or stop flowing through the transistor.

When the base is connected to the supply voltage, current will flow from the emitter to the collector. When the base is disconnected, current will stop flowing. This transistor can be used in a wide range of applications due to its adjustable current gain properties, which can be varied depending on the voltage applied to the base. It is commonly used in radio frequency applications, such as amplifying signals in the radio band.

Overall, the 2SC4957-A is a versatile RF power RF bipolar transistor from Toshiba that is perfect for a variety of applications in the radio frequency (RF) industry, as it offers adjustable current gain and can amplify signals in the radio band with a frequency range of up to 800 MHz. Its easy three-pin configuration makes it a perfect choice for applications such as amplifying signals in the radio band, automotive, consumer electronics and communication, industrial markets and more.

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