Metallfilmwiderstände

Metallfilmwiderstände, also known as metal film resistors, are a type of electrical resistor that uses a thin film of metal to create the resistive element. This film is typically deposited onto a ceramic or glass substrate. The metal used can vary, with common choices including nickel-chromium (nichrome) alloys or tin oxide. The resistance value is determined by the thickness and composition of the metal film, as well as its geometrical configuration.

These resistors are favored for their stability, low temperature coefficient of resistance (TCR), and low noise. The TCR indicates how much the resistance changes with temperature, and a low TCR means the resistor's value remains relatively constant across a range of temperatures, which is crucial for precision circuits. Their low noise characteristic makes them suitable for sensitive audio and measurement equipment.

Manufacturing typically involves vacuum deposition or sputtering to apply the metal film. A helical cut is often made into the film to fine-tune the resistance to the desired value. A protective coating is then applied to safeguard the resistive element. Metallfilmwiderstände are available in a wide range of resistance values and tolerances, making them a versatile component in electronic designs. They are commonly found in applications requiring high accuracy and reliability.