Fémrétegellenállások

Fémrétegellenállások, also known as metal film resistors, are a type of electrical resistor made by depositing a thin film of metal oxide or metal onto a ceramic substrate. This metal film is then precisely trimmed, typically by laser, to achieve the desired resistance value. They are widely used in electronic circuits due to their good performance characteristics and cost-effectiveness.

The resistance value of a fémrétegellenállás is determined by the thickness and composition of the metal film, as well as the geometry of the resistive path. The film is usually applied through vacuum deposition processes. Common materials used for the film include tin oxide or nickel-chromium. The ceramic substrate provides mechanical support and electrical insulation.

Key advantages of fémrétegellenállások include their excellent stability over time and temperature, low noise generation, and good accuracy. They offer a wide range of resistance values and tolerances, making them suitable for a variety of applications from consumer electronics to precision instrumentation. Their ability to withstand moderate power dissipation also contributes to their popularity. Compared to carbon composition resistors, they exhibit superior performance in terms of precision and stability.