SMD Patch varistor market application requirements?

The demand forSMD chip varistor(including alloy resistor and thin film resistor), ultra-high precision (such as 1/10000/0.01%) and ultra-low temperature drift (such as 5ppm) resistor networks in domestic and foreign markets is growing rapidly, especially in precision instruments, industry, medical treatment and telecommunications applications. In terms of cost performance and production scale, many brands of SMD patch varistors have reached a certain level in terms of production scale and technical strength. However, in order to meet higher requirements, many manufacturers will often improve the production process of SMD patch varistors

Now the market has put forward higher requirements for SMD patch varistors to achieve higher measurement accuracy, which requires them to have lower resistance temperature coefficient (TCR), higher stability and smaller tolerance. The tolerance of precision resistance should be less than 0.5%. TCR (temperature coefficient) Less than ± 50ppm/℃. The accuracy level of thick film devices is set by some manufacturers with tolerances of 1% and 0.5%. As long as there are precision analog circuits, precision resistance networks are very useful< Br/>

With the development of digital electronic technology, the stability of SMD patch varistorshas become an increasingly important parameter. Many circuit boards combine digital electronic equipment with analog front-end, so the stability of SMD patch varistors on circuit boards is as important as the initial tolerance, or even more important than the initial tolerance

In the past, this kind of patch varistor has always been the field of thin film technology. Now thick film materials can also achieve relatively low tolerance, so most high-precision devices will still use thin film technology, and chip resistors are also being improved. RNC series precision nickel-chromium film chip resistors expand the resistance range, with a tolerance of 0.01%, and TCR values of 5ppm and 10ppm. Ni-Cr alloy has many advantages as the raw material of SMD patch varistor components. It can provide a wide range of SMD patch varistor with a tolerance of 0.1% and a TCR of 25 ppm. The key is to use relatively cheap nickel-chromium alloy film technology to obtain high stability

In short,SMD patch varistorcan be powered on for a long time, but it will become thinner and thinner after long-term use, the resistance will become larger and larger, and even burn out! In addition, during the long-term storage of this patch varistor, the fuse will become thinner due to friction, slow oxidation of air and other reasons. If the electric appliance is used at the same time, the fuse may blow, which is often called overload. Properly thickening the patch varistor can reduce the probability of this situation, but the premise is to find an electrician to help solve the problem, because it will be safer and also conducive to protecting household appliances and power supplies

I hope that the above introduction can make you have a deeper understanding of the requirements of SMD patch varistor application in the market. Because this kind of resistance element has high requirements on the model in the process of use, you must pay attention to the model selection when purchasing