TIP117 Discrete Semiconductor Products

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TIP117 is a high-power, NPN, Darlington transistor that can be used to pass currents of up to 5A and up to 75W, making it suitable for many types of power electronics applications.

It is a three-terminal, unipolar device that consists of two layers of N type semiconductor material. The base electrode is the middle terminal between the collector and the emitter. Current entering from the collector passes through the base to the emitter, allowing the transistor to either switch or amplify.

The main application of the TIP117 is to switch large amounts of energy, such as those found in motors, robotic actuators, and industrial power converters. It is also used in low voltage circuit applications, such as audio amplifiers. Another common use is for the control of high current relays and contactors.

The working principle of the TIP117 is similar to that of more common transistors, such as the PNP or NPN bipolar junction transistor (BJT). In a BJT, the base and emitter junctions form a PN junction. When one of these junctions is forward biased with current, the other is reverse biased.

This structure allows for the control of current flow through the transistor. When the base is given a positive voltage, current passes from the collector to the emitter. Conversely, when the base voltage is less than the emitter voltage, no current passes between the collector and emitter. By changing the voltage at the base, the flow of current can be easily switched on or off.

The TIP117 is special because it incorporates two PN junctions within the same semiconductor chip. This structure creates a higher gain, reduces junction dissipation, and increases current transfer ratio (CTR). This feature increases the device\'s ability to switch higher power and control more current.

The Darlington structure of the TIP117 also helps reduce distortion at higher frequencies by lowering the output capacitance of the transistor and reducing the need for Miller capacitance compensation. This helps make the TIP117 a better choice for audio applications.

Overall, the TIP117 is an incredibly powerful, high-speed switching transistor that is ideal for many types of power applications. Its Darlington configuration provides excellent gain, current transfer ratio, and thermal stability, as well as reduced distortion at higher frequencies. This makes it an excellent choice for many different types of power electronic projects.

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