Contents
What is a thin film resistor?
Thin film resistors are a type of resistor that possess a thin resistive layer sat on top of a ceramic base. The principle difference between thick and thin film resistors is the thickness of this resistive layer, with thin films possessing a thickness of around 0.1 microns.
What is metal film resistor used for?
Therefore, in circuits where tight tolerance, low temperature coefficient, and low noise properties are important, metal film resistors are often used. Examples of applications are active filters or bridge circuits.
How thick should a film resistor be?
Thick film resistors are produced by applying a resistive film or paste, a mixture of glass and conductive materials, to a substrate. Thick film technology allows high resistance values to be printed on a cylindrical or flat substrate either covered entirely or in various patterns.
How do you identify a metal film resistor?
Common carbon film resistors are mostly yellow or pink due to their low accuracy and low production costs, while most metal film resistors are blue. There is a layer of black protective paint on the surface of carbon film resistors, while metal film resistors are usually coated with bright white protective films.
What are the characteristics of a good thin film?
Features of thin film
- Uniformity between neighboring elements.
- Minimal defects > Low noise.
- Temperature stability, high precision.
How do metal foil resistors work?
In a foil resistor, a special alloy is cemented to a ceramic base. A pattern is etched into a metal foil. The resistance is controlled by the length, diameter and alloy of the wire used. Wirewound resistors perform better than either thin or thick film resistors in stability, ESD tolerance, noise generation and TCR.
Is thin film a fixed resistor?
Usually thin film is produced as a chip or SMD resistor, but the film can also be applied onto a cylindrical base with axial leads. In this case, more often the term metal film resistor is used. Thin film is usually used for precision applications.
Are metal film resistors always blue?
It is common for through-hole carbon-film resistors to have a beige body color, while through-hole metal-film resistors often have a blue body color. Some modern resistors may have their values printed on them numerically.
Why are thin films used?
Thin films help in preventing the corrosion of metallic parts of many devices as well as protect against wear. Thin film coatings are used also as anti-tarnish protection for some sensitive materials, like Silver, in jewelry applications.
What is a thick film chip resistor?
Thick film chip resistors are made of a thick film resistive layer printed onto a ceramic substrate. The thick film resistive layer is a mixture of metal oxides.
What is a thick film circuit?
thick-film circuit. A microcircuit in which passive components, of a ceramic-metal composition, are formed on a ceramic substrate by successive screen-printing and firing processes, and discrete active elements are attached separately.
What is thin film IC?
Thin Film Integrated Circuits This IC is fabricated by depositing films of conducting material on the surface of a glass or ceramic base. The resistors are fabricated by controlling the width and thickness of the films and by using different materials selected for their resistivity.