In the process of research and development or learning, you often need to buy a small number of films. At this time, you can only find goods in the electronic market. The goods in the market are mixed. You should learn to distinguish between good and bad. Here are some problems faced by IC spot:
1. Grinding disc
These chips are very similar to Quanxin chips. There is basically no obvious difference in the size, font and depth of printed words and patterns on the surface, and the batch number is the same. However, if you carefully observe the chip surface, you will find many small parallel scratches, and the origin identification on the back is also different. The pins are generally not shiny, but matte, with traces of oxidation, and the pin spacing is relatively consistent Generally speaking, the polished film is mainly the whole new film is put too long, or the batch number is relatively miscellaneous. In order to sell well, it is polished and printed into a unified and relatively new production batch number.
2. Remove the machine piece
These chips are classified after being removed from the circuit board. The pins are obviously marked with traces of soldering, glittering, and the pin spacing is obviously different. There are differences in the size, font and depth of printed words and patterns on the surface. The production batch number is generally different, and the origin identification on the back is relatively miscellaneous. Under Qinji group, baineng.com is a leading electronic industry service platform in China. It provides a complete set of electronic industry supply chain solutions such as components, sensor procurement, PCB customization, BOM distribution and material selection online to meet the comprehensive needs of small and medium-sized customers in the electronic industry.
3. San Xin Pian
There are differences in the size, font and depth of printed words and patterns on the surface of these chips. The production batch number is generally different. The origin identification on the back is relatively miscellaneous, but the pins have no traces of use, but there are traces of oxidation. Generally speaking, this kind of chips are sold by traders who put unused chips collected from various routes in one tube.
4. Brand new film
The printed characters and patterns on the surface of these chips have the same size, font, depth, production batch number, and the origin identification on the back. The pins are very neat. There will be a light in the middle of the matte surface. The tube characters loaded with chips are very new, transparent and not yellow.
