Metal film resistors are generally made by vacuum evaporation process, that is, the alloy is heated in vacuum, the alloy evaporates, so that a conductive metal film is formed on the surface of the porcelain rod. Grooving and changing the thickness of the metal film can control the resistance value. Its thermal resistance, noise potential, temperature coefficient, voltage coefficient and other electrical properties are better than carbon film resistor. The manufacturing process of metal film resistor is flexible. It can not only adjust its material composition and film thickness, but also adjust the resistance value by grooving, so it can be made into good performance and wide range of resistance.

Development trend

1. Miniaturization and high reliability;

2, discrete small metal film resistor still has a wide range of uses, but will further reduce the size, improve performance, reduce the price;

3. In consumer electronics, carbon film resistors are still dominant, and precision resistors will be dominated by metal film resistors;

4. In order to adapt to the development of circuit integration and planarization, the need for chip resistor will increase significantly; The universal type will tend to develop thick film resistors, while the precision type will still tend to metal film and metal foil resistors in the thin film class;

5. Develop a combined resistance network.