MMBTA28-7

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The MMBTA28-7 is a single bipolar junction transistor (BJT) used in a wide range of electronic applications. This type of transistor is most commonly used in switching and amplification circuits, with its moderately high gain allowing it to be used in audio and other low-power circuits. The MMBTA28-7 is a commonly used small signal NPN transistors, manufactured by many different companies under various names.

The MMBTA28-7 is a general purpose transistor with a high gain of 800 to 1000. It is ideal for applications where a medium amount of power needs to be switched or amplified, such as servo motors, audio amplifiers, and amplifying stages of audio systems. This transistor is designed to be operated in an active mode and typically handles currents of up to 0.5A. The device comes in a variety of packages, such as the TO-92, SOT-23, SOT-223, and SOIC-8, allowing for flexibility in developing projects.

The main purpose of a transistor is to amplify or switch electrical signals and power. Transistors consist of three terminals, a Base, Collector and Emitter. Bipolar transistors, such as the MMBTA28-7, have an extra region which is called the Base. Electric current flows through the Base and is amplified at the Collector and Emitter. The collectors and emitters are closely coupled, meaning they are very close together and are electrically connected as well. This allows the transistor to function as an amplifier.

The working principle of the MMBTA28-7 is that when a current passes through the Base, the Collector and the Emitter will both output the same current with a gain of 800 to 1000. This gain is determined by the Base current and is affected by the Beta or Hfe of the transistor. Beta is a measure of the current gain of a transistor and is usually expressed as a ratio. The Beta for the MMBTA28-7 is usually in the range 100 to 600. The higher the Beta, the higher is the voltage gain of the transistor.

The MMBTA28-7 is a great transistor for general applications. Its high gain, flexibility and low cost make this transistor a great choice for most projects. With its high-frequency capabilities, the MMBTA28-7 can also be used in RF applications. Its low power consumption also makes it suitable for battery-powered applications. Whether you’re building amplifiers, switching circuits or just need a reliable, high-quality transistor, look no further than the MMBTA28-7.

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