What is a metal film?
Metal film resistors have a thin metal layer as resistive element on a non-conducting body. They are among the most common types of axial resistors. Other film type resistors are carbon film and thick and thin film resistors. In most literature, the term “metal film resistor” implies it is a cylindrical axial resistor.
Are metal film resistors inductive?
Film resistors may be approximately classified as follows: values < 100Ω are inductive. values between 100Ω and 470Ω are practically true resistive.
How are metal film resistors made?
The metal film resistor is manufactured by vacuum depositing a metal layer onto a high purity ceramic cylindrical rod. Often, the thicker the metal film deposited, the more stable the resistor value. The accuracy of the laser trimming means that the metal film resistors can be manufactured to a very close tolerance.
What’s the difference between carbon film and metal film resistors?
The key difference between metal film and carbon film resistors is that metal film resistors use a metal film to limit the flow of electric current whereas carbon film resistors use a carbon film to limit the electric current flow. 1. Shaik, Asif. Metal Film Resistor.
Which is more accurate a wirewound or a metal film?
They are made by an evaporation/deposition process where a base metal is vaporized in a vacuum and deposited on an insulating substrate. Compared to precision wirewounds, they are not as accurate (>0.01%), have higher TCR (20-200ppm/C), and are not as stable (200-600ppm/yr.)
Which is better wirewounds or metal film resistors?
Compared to precision wirewounds, they are not as accurate (>0.01%), have higher TCR (20-200ppm/C), and are not as stable (200-600ppm/yr.) They can be small for “chip” applications, are low cost in high quantities, and are excellent in high frequency and fast rise time applications.