Five steps to identify real IC chips
When it comes to the authenticity of original electronic components, IC chips simply need to distinguish whether the components are original or new. The term "bulk new goods" here refers to refurbished or disassembled parts, which are processed and reprocessed devices, so people in the industry generally call them "bulk new goods". At the same price, everyone wants to buy new and functional devices, so it requires some common sense to distinguish which are original new products and which are what we call bulk new products.
1、 Check whether the surface of the integrated circuit chip has been polished. The polished chip surface will have fine lines or even micro marks printed before. Some chip surfaces are coated with a thin layer of paint to cover up, which looks a little shiny and has no plastic texture.
Look at the printing. The vast majority of current IC chips use laser marking or a special chip printing machine to print words, which are clear, not conspicuous, not fuzzy, and difficult to erase. The refurbished chip either has a "sawtooth feeling" due to the corrosion of the edge of the handwriting by the cleaning agent, or the printing is vague, different in depth, incorrect in position, easy to erase, or too conspicuous. In addition, the current IC chip manufacturers of the silk screen process have long been eliminated, but many chip refurbishments still use the silk screen process due to cost reasons, which is one of the criteria for judgment. The words printed on the silk screen will be slightly higher than the chip surface touch can feel slight unevenness or astringency. However, it should be noted that due to the sharp decrease in the price of small laser marking machines recently, more and more renovated IC chips are using laser marking, and some new chips will also use this method to change the word mark or simply reprint to improve the grade of the chip. This requires special attention, and the differentiation method is more difficult, so you need to practice "hot eyes". The main method is to look at the overall coordination. If the handwriting is inconsistent with the background and the new or old level of the pins, such as the character mark being too new and too clear, there is a greater possibility of problems. However, many small factories, especially some small IC chip companies in China, are born with such problems, which adds a lot of trouble to the identification, but this method is still very meaningful for the judgment of IC chips of major mainstream factories. In addition, more and more chip marks have been modified with laser marking machines recently, especially in memory and some high-end chips. Once it is found that there are some uneven letters and pens in the laser printing position, it can be considered a Remark.
3、 Look at the device production date and package factory label. The label number of the original product, including the label number on the bottom of the chip, should be consistent and the production time should be consistent with the device product. However, the label number of the Remark chip is confused and the production time is different. Although the front labels of Remark's chips are consistent, sometimes the values are unreasonable (such as the "lucky number") or the production date is inconsistent with the device. If the label at the bottom of the device is very confusing, it means that the device is a Remark.
4、 Look at the pins. All tinned pins that are as bright as "new" must be refurbished. Most of the pins of genuine IC chips should be so-called silver powder pins, which are dark in color but uniform in quality and the surface should be free of oxidation marks. In addition, the pins of DIP and other plug-ins should not have scratches. Even if there are scratches (only after repacking), they should be neat and in the same direction, and the metal exposure should be smooth and free of oxidation.
5、 Measure the device thickness and look at the edge of the device. Many polished and refurbished pieces of the original laser printing (most of the power devices) must be polished deeply to remove the original mark so that the overall thickness of the device will be significantly smaller than the normal size, but it is difficult for inexperienced people to distinguish without comparing or measuring with a caliper, but there is an alternative method, that is, look at the front edge of the device. Since the plastic encapsulated device must be "demoulded" after injection molding, the edge angle of the device is round (R angle), but the size is not large. It is easy to grind the fillet to a right angle during polishing. Therefore, once the front edge of the device is at a right angle, it can be judged as a polished product. In addition, another method is to check whether the merchants have a large number of original outer packaging materials, including cardboard boxes with consistent marks inside and outside, anti-static plastic bags, etc. In actual identification, multiple methods should be used. If there is a problem, the quality of the device can be determined. If there are chips that we can't judge with the naked eye and experience, we can use writing tools, such as magnifying glass and digital magnifying glass, to polish the refurbished chip table. There are tiny holes that are difficult to see with the naked eye. We must use equipment to observe!
There are several key points:
1) Look at the typewriting. Generally, the retyped (white) words can be erased with chemical thinner are retreaded goods, and the original goods cannot be erased.
2) Look at the leading angle. The pins of the original IC chip are very neat and straight, while the pins of the refurbished IC chips are not neat and some of them are crooked.
3) . Look at the positioning holes. The positioning holes of the original shipment are relatively consistent. Some of the refurbished ones have different depths or are really polished. If you look carefully, you can see the traces of the original positioning holes. In actual work, we should carefully observe and observe. Some counterfeiting processes are quite high, so we should be particularly careful in IC chip procurement!