High-Temperature Applications Resistor Guidelines

Posted by doEEEt Media Group
On May 5, 2020
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Resistors have traditionally been manufactured by a variety of methods and technologies, including metal and metal-oxide film, metal foil, carbon, wirewound, and thick-film methods. Each has specific characteristics that make them more or less suitable for high-temperature applications. Resistor degradation at a high temperature can vary from a small resistance change over time to a catastrophic change in resistance, exhibited by either becoming open circuit or, in some cases, a short circuit.

Non-Wirewound Resistors: Film, Foil & Metal Oxide

Posted by Tomáš Zedníček
On March 6, 2019
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Introduction to Film Resistors Film resistors are built either on cylindrical rods or on planar substrates. Usually, the material in the rods and substrates is ceramic in the state of aluminum oxide (alumina), but glass may occur. Hollow cores exist but are more and more abandoned when sizes are becoming smaller. This design suffers also from drawbacks: the construction is more fragile and the heat dissipation is poorer than that of a solid core.

Talking about Non-Wirewound Resistors: Carbon, SMD and Network

Posted by Tomáš Zedníček
On March 5, 2019
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Carbon film resistors sometimes are called surface layer resistors. Better qualities are classified as “stable” with a ΔR/R that will stop at ≤1%. Their role has, to a great extent, been taken over by the metal film but they still have a market, especially as cheap 5 percent E 24 components. At new designs, one should yet consider replacing them with metal film resistors that also are offered in E 24, 5 percent.