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Tell you a few ways to tell if the component is original or new.
Speaking of the true and false components, nothing more than need to distinguish, the components are original or scattered new. The new products mentioned here are refurbished parts or disassembled parts. They are processed and reworked, so people in the industry generally call it new goods. At the same price, everyone wants to buy a new, new-featured device. Let's take a look at how the component is original or new.
1. Look at the surface of the integrated circuit chip for traces of polished
Any surface of the polished chip will have fine lines or even micro marks on the previous print. Some cover the surface of the chip with a thin coating. It looks a bit shiny and has no texture.
2. Look at the printing
Most of the current chips are laser-marked or printed on a dedicated chip printer. The writing is clear, unobtrusive, unobtrusive and difficult to erase. Refurbished chips are either “saw-toothed” by the cleaning agent and are “saw-toothed”, or they are illegible, inconsistent, misplaced, easily erased or overly conspicuous. In addition, the screen printing process of the current IC manufacturers have long been eliminated, but many chip refurbishment due to cost reasons still use the silk screen process, which is also one of the judgment basis, the screen printing word will be slightly higher than the chip surface, you can feel the slight unevenness by hand touch Or have a feeling of worry.
However, it should be noted that due to the recent decline in the price of small laser marking machines, more and more refurbished ICs use laser marking, and some new films will use this method to change the word mark or simply hit again to improve the chip. Grades, this requires extra attention, and the method of distinguishing is more difficult, you need to practice the "eyes of fire." The main method is to look at the overall coordination, the writing and the background, the new and old degree of the pin does not match, such as the word mark is too new, too clear the possibility of problems, but many small factories, especially some small IC companies in China The chip was born like this, which adds a lot of trouble to the identification, but the judgment of the mainstream big chip is still very meaningful.
In addition, more and more laser marking machines have been used to modify the chip markings, especially in the memory and some high-end chips. Once the location of the laser printing is found to be inconsistent with individual letters and uneven thickness, it can be determined. It is Remark.
3. Look at the pins
All the tin-plated pins that are as bright as "new" must be refurbished. The majority of the pins of the ICs should be so-called silver powder feet. The color is darker but the color is uniform, and there should be no traces of oxidation on the surface. In addition, the pins of DIP and other plug-ins should not have traces of rubbing, even if there are (repackaging will be) scratches should be neat, in the same direction and the metal exposed is smooth and non-oxidized.
4. See device production date and package factory label
The label of the goods including the label on the bottom of the chip should be consistent and the production time should be consistent with the product, while the reprinted sheets without Remark are confusing and the production time is different. Although the Remark chip has the same frontal label, sometimes the value is unreasonable (such as the label "Geely number") or the production date does not match the device product. If the label at the bottom of the device is very confusing, the device is Remark.
5. Measure device thickness and see device edges
Many original laser-printed refurbished refurbished pieces (mostly power devices) must be ground deeper because of the need to remove the original mark, so the overall thickness of the device will be significantly smaller than the normal size, but not compared or measured with a caliper, the general inexperienced person still It's hard to tell, but there is a general knowledge of breaking the law, that is, looking at the front edge of the device. Because the plastic sealing device must be “released” 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 rounded corner at right angle during the grinding process, so the front edge of the device is right angled. Can be judged as grinding goods.
In addition, there is another method to see if the merchant has a large number of original packaging materials, including the inside and outside of the uniform carton, anti-static plastic bags, etc., the actual identification should be used in multiple ways, there is a problem can be identified The quality of the device. If we can write chips, we can't judge with the naked eye and experience. We can use a writing tool, such as a magnifying glass and a digital magnifying glass, to polish the refurbished chip table. The tiny holes are difficult for us to see with the naked eye. We must rely on Equipment to observe! There are a few key points:
1), look at typing, generally refurbished re-spinning (white) with chemical thinner can erase the word is generally refurbished goods, the original goods can not be wiped off.
2) Look at the lead angle. The pins of the original goods are very neat and like a straight line, while the retreaded ones have some feet that are not neat and awkward.
3), look at the positioning hole, observe the positioning hole of the original goods are relatively consistent, some of the refurbished depths or simply polished, and some can see the traces of the original positioning holes. In the actual work, we must also observe and observe carefully. Some of the counterfeiting techniques are quite high, and we must be particularly cautious in purchasing!