Everything You Need to Know About Ceramic Resistors

Resistors are commonly used electronic components that are available in various sizes, ranging from small surface mount chip resistors to large, wire-wound power versions, and such products are found in nearly every circuit board and electronic device you use. A resistor is a two-terminal electrical component, and its primary purpose is to introduce resistance in an electrical circuit, reducing current flow. However, resistors are also applicable for other purposes such as adjusting signal levels, dividing voltages, biasing active elements, and terminating transmission lines. The range of resistors used is expanding with new applications; new series combinations and parallel networks are being created to establish complex circuits that work as droppers, dividers, or limiters for voltage levels in a circuit.

Resistors are passive devices, implying they do not produce electricity, but reduce or attenuate the voltage signal. A typical type of resistor is a linear device that follows Ohm's Law, meaning it mainly produces a voltage drop whenever electric current flows through the device. The electrical energy that is lost during this process gets converted into heat energy. Therefore, the voltage or current drop depends on the resistance value of the resistor. This ability of resistors becomes very handy when producing a voltage-to-current or current-to-voltage conversion, either by controlling or reducing the current flow or voltage produced.

Resistors come in various shapes, sizes, and characteristics to meet the demands for resistivity throughout many different fields. Some of the traits that resistors can possess include high stability, high voltage and current handling, optimal temperature and voltage coefficients, good frequency responses, ample reliability, high temperature rating, etc.

Resistors can be divided into fixed value resistors and variable resistors. As the name suggests, the resistance value remains constant in the circuit with fixed resistors, such as carbon pile, carbon composition, ceramic composition, and lead arrangements. On the other hand, variable resistors can change the voltage or current resistance by moving the tapping points along the resistance element. Some examples of variable resistors are potentiometers and resistance decade boxes. In this blog, we will be discussing ceramic composition resistors in detail, both of which are popular fixed resistor options.

Ceramic Composition Resistors

Ceramic resistors use ceramics to regulate the resistor's resistive value. Due to its high-temperature, electrically conductive ceramic material, the ceramic resistor is a more high-tech alternative to the resin-bonded carbon composition type. It dissipates heat much faster, so you can safely operate your device with higher average power ratings without worrying about damage. Ceramic resistors have several other benefits over their carbon counterparts, such as being able to manage higher temperatures without breaking down or experiencing increased resistance, also making them cost-effective. In addition, ceramic resistors have better reliability because of their stability under extreme voltage and temperature conditions. They are also non-inductive which implies they are most suitable for high-frequency applications.

The construction of a ceramic resistor is simple and reliable because it consists mostly of conductive ceramic materials with bonded metal contacts. All ceramic resistor mixtures consist of a mixture of finely powdered carbon and ceramic material, and their ratios define the final resistor value. Generally, the ceramic material is higher in ratio than the carbon powder because the greater the value of carbon in the mix, the lower the resistance value. It helps improve pulse stability and the operating temperature range. The mixture is then molded in an axial resistor package and surrounded by an insulating coating with color-coding to indicate value and tolerance.

The wires or leads are attached at the end of the package’s two terminals. The ceramic filler used in producing resistors is mostly phenolic, similar to plastic. Selection from several options allows for control over properties like resistivity, which is essential in different applications. A wide variety of geometry is available to meet all requirements ranging from resistance values of hundreds of joules to megajoules.

The ceramic resistors can withstand high temperatures, with some capable of handling up to 250°C. They come in various wattage and resistance values ranging from 1/2 Watt to 1 Watt, to 2 Watt series with resistance values from 3.3? to 1M?. Moreover, some ceramic composition resistors can also operate with a 1000 W power rating and are an excellent option for electronic equipment because their use of carbon composition materials offer bolstered electrical resistance, stability, and reliability. These particular types can be found in packages like axial or tubular slabs, while others require special arrangements to fit appropriately into specific device shapes like disk encapsulated load banks, water-cooled modules, etc.

In Conclusion

Resistors are an extremely crucial component of any electronic part which is why the application of each must be determined with great precision. Owned and operated by ASAP Semiconductor, One Click Aviation is a leading supplier of top-quality electronic parts, alongside components for the aerospace, defense, and civil aviation industries. Look no further than One Click Aviation for top-selling components such as electrical motors, transformers, converters, generators, fuel cell power units, batteries, solar/electric power systems, and much more. As our dedicated customer service representatives are available by phone or email 24/7x365, contact us today to receive a quote for your comparisons at your earliest convenience.


April 29, 2022
December 6, 2021

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