How to distinguish between membrane resistance and thick film resistor - Knowledge of electrical resistance

by:Thermistor-Mov     2020-06-21
How to distinguish between thin film resistors and thick film resistance were introduced in this paper to distinguish thin film and thick film resistance identification methods, this article about 1080 words, read 10 minutes. What is a thin film and thick film resistance? Thin film and thick film resistor is one of the most common type on the market. Whose characteristic is the resistance of the ceramic substrate layer. Although their appearance can be very similar, but their very different performance and manufacturing process. Name derived from different layer thickness. The thickness of the film is about 0. 1 micron or less, and the thickness of the thick film is about thousands of times. However, the main difference is that the resistance of membrane method applied to the substrate. Film resistor with vacuum deposition on the insulating substrate metal film. By using a special paste fire to substrate manufacturing thick film resistors. The paste is a mixture of glass and metal oxide. Thin film is more accurate, with better and more stable temperature coefficient. As a result, it and other high precision technology competition, such as wire wound or large pieces of metal foil. On the other hand, thick film is preferred, because the price is much lower, the higher requirements are not important. Thin-film technology of thin film chip resistors schematics resistance layer sputtering ( Vacuum deposition) The ceramic substrate. This produces the about 0. 1 microns thick uniform metal film. The use of nickel and chromium alloy (usually Nickel-chromium alloy) 。 Their production in different thickness, so as to adapt to a series of resistance. The dense and uniform, making it suitable for through subtraction method trimming resistance. By printing or by laser trimming, produce design calibration path to increase the resistance and resistance. Base is usually alumina ceramics, silicon or glass. Thin film is usually as a way of making chips or SMD resistor, but film can apply to the cylindrical with axial lead base. In this case, the more often use the term metal film resistor. Thin film are normally used for precise application. They have a relatively high tolerance, low temperature coefficient and low noise. The same for high frequency applications, better than the thick film. Usually low inductance and capacitance. If the cylindrical spiral ( Metal film resistor) Execution, the thin film of parasitic inductance can be higher. This higher performance with cost, this is likely to be higher than the price of thick film resistor. A typical example of using film is medical equipment, audio equipment, precision control and measurement equipment. Thick film technology thick diaphragm type resistor diagram in the 1970 s, thick slices became popular. Today, these are by far the electrical and electronic equipment used in most of the resistor. They are usually as a chip resistor ( SMD) Compared with the lowest cost, and any other technology. Resistance of materials is a special kind of slurry, containing adhesive, carrier and deposition of the mixture of metal oxides. Carrier adhesive is vitreous glass material, organic solvent system and plasticizer. Modern resistor paste based on the ruthenium, iridium and rhenium oxide. This is also called metal ceramic ( Ceramic - Metal) 。 The resistance layer printing to the substrate under 850 ℃. Base material is usually 95% of the alumina ceramics. Then paste the on carrier, become vitreous membrane, this makes it a good moistureproof. A complete fire process schematic picture in the picture below. Thickness of about 100 microns. This about 1000 times better than the film. Unlike film, this process is additive. Temperature coefficient is usually 50 PPM to 200 PPM/K. Tolerance between 1% and 5%. Because the cost is low, so don't need high tolerance, low TCR or under the condition of high stability, is usually preferred thick film. Therefore, the resistance can in almost any device with AC plug or battery. Thickness of technology is not only the advantages of lower cost, but also can deal with more power, to provide a wide range of resistance and withstand high surge condition. 文章/ rhqfbmdzyh。 HTML this paper label: resistance thick film resistance how to differentiate between thin film resistor with a thick film resistor: five universal hold a piece of paper: the main characteristics of capacitance and the parameters
Custom message
Chat Online 编辑模式下无法使用
Chat Online inputting...