Friends who have been selling IC components are estimated to be more clear. There are a variety of IC chips on the market, and there are various kinds of different types of IC chips. It is sometimes difficult to see how the various materials differ. Now tell you some tips on purchasing ICs and teach you how to distinguish between original and new chips.
1, the original goods: the original factory produced, divided into imported original and domestic original.
2, scattered new goods: the word new, mainly used in the aspect of IC chips, the main meanings are:
First, this product is not produced by the original factory, it may be produced by other manufacturers, but the original brand, that is, fake, the supplier called the new, or the original goods come to the people!
Second, the original factory production, but some unqualified materials. The original factory will cut the price and dispose of it through other channels. After the seller came in, it was called a new one!
Third, the original production, used, polished, tinned, after a series of cool treatment, the appearance looks good, come out for sale, also known as Sanxin, but it is actually refurbished!
3, refurbished goods: after the product is produced from the original factory, after use, there is a certain degree of wear and tear, performance is different from the original factory just produced, after special processing, its appearance or performance is restored to Close to the state that the original factory just produced, called renovation!
4, the old demolition parts: the original production, has been used, removed from the circuit board. Not treated by washing. Generally, if you buy a chip with the amount of the last thirty or fifty, it is best to find an agent or its distributor instead of going to the general "commodity" counter to get the goods. Generally, what is done on the counter (the so-called unified goods) is basically the spot. Refurbished goods or old goods, and they look at people's quotes, experts or acquaintances, most of them do not dare to be too much, but ordinary people can still be deceived, can deceive, it is a relatively common phenomenon (national morality) The crash is comprehensive), everyone should pay more attention. Even if you pick up the goods on such a counter, you must make it clear, there is a bad change, and remember to "shop around." In addition, the transaction price should be much lower than the normal price, otherwise it will still find a regular agent. It is necessary to know that the purchase price of many processed old chips is only about 10%-20% of the market price of the new film!
(1), hot air method, this method is a formal practice for a cleaner, tidy board, especially the more valuable SMD board
(2), "fried" method, this is indeed true, with the preparation of high-boiling mineral oil to "fried", very old or very messy garbage board is usually used this method.
Here, I want to explain to you that if the waste generated in the separation and re-manufacturing process of the old film is not properly treated, it will seriously pollute the environment (including a large number of toxic compounds and heavy metals that are difficult to degrade), and the cost of "proper disposal" will be higher. All of the recovered income, so some companies in developed countries would rather spend money and pay the freight to "send" the e-waste to some countries in China and South Asia, and they are not willing to deal with it themselves. There is "saying". The difference between the old and new chips is far from recovering the loss of environmental pollution. We must know what to expect! The regular agents for chip sales are generally in office buildings. There are also many new distributions in the electronic market such as Huaqiang and SEG, most of them in the lobby. There are also a few counters in the separate rooms around, so you should pay attention to the identification when buying chips.
The main methods to distinguish between original goods and refurbished goods are:
1. Look at the surface of the chip for traces of sanding. 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, which looks a bit shiny and has no plastic 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 "sawed" by the edges of the writing strips and are "sawed", either with ambiguous printing, varying shades, misaligned locations, easy to erase or overly conspicuous.
The silk screen printing process has been eliminated by the current IC manufacturers, but many chip refurbishment still uses the silk screen process for cost reasons. This is also one of the judgment basis. The silk screen word will be slightly higher than the chip surface, and the hand touch can feel subtle unevenness or Feeling of bun. 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 grade of the chip, this requires special attention, and the method of distinguishing is more difficult, you need to practice the "eyes of the 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 the new word, the possibility of clearing the problem is also large, 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 mark. Especially in the memory and some high-end chips, once the position of the laser printing is found to be irregular and the thickness of the stroke is uneven, it can be considered as Remark. of.
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 IC should be the so-called "silver powder feet". The color is darker but the color is uniform. There should be no traces of oxidation or "flux 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. Look at the date of manufacture of the device and the label of the package. The label of the goods includes the labels 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. If the label on the bottom of the device is very confusing, the device is Remark.
5. Measure device thickness and look at device edges. Many original laser-printed refurbished refurbished films (mostly power devices) must be polished deeper due to the removal of 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. Since 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.
In addition, some counters may also bring new products under the customer's insistence, but they must be taken from those who actually make new films, but they will definitely tell the customers to go to the warehouse to get the goods. Don't take it seriously! 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 surface of a refurbished chip. The tiny holes on the surface are difficult to see with the naked eye. We must use the device to observe !
There are a few key points:
1, look at typing, the general refurbished re-punch (white) with "Tian Na Shui" (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 original goods pins are very neat and like a straight line, and the refurbished processed some feet are not neat and somewhat awkward. 3 Look at the positioning hole, observe the positioning hole of the original goods are relatively consistent, some of the refurbishment is different or simply polished, and some can see the trace of the original positioning hole if you look carefully. In the actual work, we must also observe and observe carefully. Some of the counterfeiting techniques are quite high and should be cautious.
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