AP851 3R9 J

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Through Hole Resistors are an important component of any electrical system. The AP851 3R9 J is one of the most popular resistors of this type due to its high performance and reliability. This article will discuss the application field and working principle of this resistor.

Applications

The AP851 3R9 J is a through hole resistor designed for use in high-voltage and high-current applications. It has a very wide resistance range, from 0.5 Ohms to 2 KOhms, and can handle up to 5 Amps continuous current. This makes it suitable for use in a variety of applications, such as providing power to electrical components, implementing voltage-level shifting, controlling current in power distribution, and more. It is also often used in automotive and industrial applications.

Physical Construction

The AP851 3R9 J is a surface-mount device consisting of a solid ceramic substrate, two copper leads embedded in the substrate, and an array of high-quality resistive elements. The resistance is determined by the geometry of the leads, as well as the material composition of the resistive elements. The resistor is then encapsulated in a hermetically sealed case to protect it from environmental contaminants. This provides protection against corrosion, electrical noise, and vibration.

Potting

The AP851 3R9 J has an additional optional feature: potting. This involves filling the resistor\'s cavity with a polymer material that further seals it and helps to dissipate heat. Potting also helps reduce vibration, which can damage delicate electrical components and lead to resistor failure over time. The potting material can be tailored to the application requirements, such as temperature resistance, electrical properties, and more.

Working Principle

The working principle of the AP851 3R9 J is simple. It consists of an array of resistor elements that are formulated to provide a specific resistance value. When a voltage is applied to the leads, it drives a current through the resistor. The voltage is dropped across the resistor due to the resistance of the material, which reduces the current passing through the device. This provides a controlled flow of current that can be used to implement voltage-level shifting, current limiting, and other electrical requirements.

Conclusion

The AP851 3R9 J through hole resistor is an ideal choice for high-voltage, high-current applications. It has a wide resistance range and can handle up to 5 Amps continuous current. It is also protected from environmental contaminants with potting material and a hermetically sealed case, which helps reduce vibration and electrical noise. This makes it a reliable and long-lasting choice for any electrical system.

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