Shenzhen East conduction technology to teach you how to identify the original and scattered chips [bulk purchases]
Update date：2012-6-27
A lot of e-procurement personnel often encounter when you purchased the original chip, but when you buy a home when the engineer to tell you is scattered to the new chip, this is a problem that plagued a lot of people, Shenzhen East guide science and technology based on experience. teach you how to identify the original chips and the bulk of new chip. For your reference.
The main difference between original products and refurbished goods is:
1, we must first see, what? To see whether the chip surface grinding traces. Where the polished surface of the chip will have the appearance of fine lines and even printing of micro-marks, to cover up some still in the chip surface coated with a thin layer of paint, looks a bit shiny, plastic texture.
2, the second to see the print. The chip now the vast majority of laser marking or dedicated chip presses printing, writing clear, neither prominent, not fuzzy and difficult to erase. Refurbished chip or writing by the edge of the corrosion of the cleaning agent has a sense of "sawtooth" or print fuzzy, shades, malposition, easy to erase, or too prominent. In addition, the screen printing process of IC manufacturers have already eliminated a lot of chips refurbished are still using the screen printing process for cost reasons, and this is one of the judge in accordance with the silk screen the word will be slightly higher than the chip surface, touch can be felt slightly uneven or astringent feeling. But it must be borne in mind that more and more due to the recent price of a small laser marking machine is significantly reduced, renovation IC laser marking, some of the new film will use this method to change the word mark or simply to play again to "improve" the grade of the chip, which requires extra attention, and the distinction is more difficult, need to develop its "eyes". The main approach is to look at the overall coordination, handwriting, and background, pin Condition do not match, such as the new word mark, rinsing the possibility of problems, but many small plants, especially some small domestic IC companies the chip was born so, add a lot of trouble for the identification, but this law or of the judgment of the mainstream manufacturers chip meaningful. In addition, the phenomenon recently with a laser marking machine to modify the chip mark more and more, especially in memory and some high-end chips, once the location of the laser printer there are individual letters missing strokes uneven thickness, can be identified Remark of.
3, see the pin. Where bright as the "new" tin-plated pin will refurbished goods, genuine IC pin vast majority of so-called "silver foot", but the fineness of a uniform dark color, the surface should not have oxide traces or "flux , the other pin of the DIP and other plug-ins should not scratch marks, even if there is (again packing will have) scratches should be neat, in the same direction and the metal is exposed at the smooth non-oxidation.
4, look at the date of the device production and packaging plant label. Labeling of goods including chip underside of the label should be consistent and productive time to match device products, without Remark refurbished tablets label confusion, the difference in time of production. Remark chip positive label such as consistent, but sometimes the value anomaly (such as marked "lucky number") or the production date and device products do not match, the device underside label a lot of confusion, the device is Remark.
5, the measured thickness of the device and look at the device edge. A lot of grinding of the original laser printer refurbished tablets (mostly power devices) to remove the original mark must be polished deep, so the overall thickness of the device will be significantly less than the normal size, but not contrast or caliper, the general lack of experience people are still difficult to distinguish, but there is an alternative to see through France, ie, on the front edge of the device. To be due to the injection molding of plastic devices "mold release", so the device is rounded edge angle (R angle), but the small size of the grinding process it is easy to fillet ground at right angles to the front edge of the device is at right angles to the can be judged as polished goods.
In addition, a method is to see whether there is a lot of the overpack businesses, including logo inside and outside tray, anti-static plastic bags, the actual identification should multi-Fawzi, a problem can be identified the quality of the goods of the device.
In addition, some counter the insistence of customer may also bring new goods, but it is certainly to take from those who really do the business of film, but certainly with the customer said to the Treasury to take the goods, we can not take it seriously!
If you write chip we can not with the naked eye and experience to judge can make use of a written tool, such as a magnifying glass and digital magnifying glass polished refurbished chip surface fine holes is difficult to see with the naked eye out, we must use equipment to observe There are a few key points:
A look at the type: general renovation to re-fight the child (white) with "Thinner" (chemical thinners) to erase the word is generally refurbished goods, the original goods is indelible.
2 to see the lead angle: the pin of the original goods is very neat, like a straight line, while the renovation had some irregular feet a bit crooked.
3 to see the positioning holes: observation of the positioning holes of the original goods, refurbished and some different shades or simply really polished flat, and some if you look closely can see traces of the original positioning holes. Careful observation to observation, but also in practical work, counterfeiting process is quite high, be careful!
Finally, the East guide technology and wish everyone a pair of eyes, less fooled.
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