2N697S

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Introduction
The 2N697S is a bipolar junction transistor (BJT) that has been built for low power, high frequency switching applications. It is commonly used for broadband radio frequency and microwave applications and can to be used for amplifier and oscillator circuits. It is a single device, meaning that it contains one base, one collector, and one emitter. The 2N697S is available in a 3-pin SOT-89 package and a 4-pin SOT-323 package.
Characteristics
The 2N697S is a NPN transistor, meaning that it consists of three terminals that are connected to a base, a collector, and an emitter. It has a very low gain (hFE) of 10 at 1 MHz and a low output impedance (hie) of 8 Ohms. It also has a very low supply voltage, which is ideal for switching applications due to its low power consumption. The 2N697S also has very low leakage currents, making it suitable for use in high frequency switching applications. Furthermore, it has a very good thermal performance, allowing it to operate in temperatures up to 150 °C.
Application Field
The 2N697S has a wide range of applications, including radio frequency and microwave amplifiers, oscillators, and high frequency switching circuits. It can be used for general purpose switching applications, where a very low current is required, as well as for high frequency and high power applications, such as in radiolocation systems. It is commonly used in cellular, cordless, and other wireless communication systems, as well as in industrial and consumer electronic equipment. For instance, it can be used to control the speed of motors and in switching power supplies.
Working Principle
The 2N697S operates on the principle of base-emitter-collector current flow. In the ‘on’ state, electrons flow from the emitter to the base, and then to the collector. This creates a current path, allowing electrons to flow from the emitter to the collector. In the ‘off’ state, no electrons are allowed to flow between the emitter and collector. When voltage is applied to the base, electrons are attracted to the base-collector junction, allowing them to flow between the emitter and collector. This, in turn, allows current to flow through the transistor. The gain of the 2N697S is determined by the ratio of the collector current to the base current.
Advantages
The 2N697S has several advantages, including its low cost, low voltage requirements, and low power consumption. It has a low leakage current, enabling it to be used in high frequency switching applications. Additionally, it has a very good thermal performance, allowing it to be used in heated environments such as motors or power supplies. The 2N697S can also be used as a general purpose transistor, since it has a low output impedance and a very good gain. Finally, it is available in both a 3-pin SOT-89 package and a 4-pin SOT-323 package, allowing it to be used in many different applications.
Conclusion
The 2N697S is a bipolar junction transistor that has been designed for low power, high frequency switching applications. It is available in a 3-pin SOT-89 package and a 4-pin SOT-323 package, and has a low gain and output impedance. The 2N697S has a wide range of applications, including radio frequency and microwave amplifiers, oscillators, and switching circuits. It is also suitable for general purpose switching, as well as high frequency applications. Furthermore, it has a low power consumption and can be used in temperatures up to 150 °C.

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