The regular agents of chip sales generally work in office buildings. There are also many new distribution products in the electronic market such as Huaqiang and SEG. Most of them are in separate rooms around the hall, and there are also a few counters. When buying chips, you should pay attention to identification.

Types of electronic components:

1. Original goods: The original original packaging products, the original factory produced, if it is ordered from the manufacturer, you do not have to worry. If you are ordering from an agent or distributor, you need to pay attention. Imported original and domestic original. The most prone problems are:

Domestic original pretending is difficult to identify, only by comparison, there are some differences in the outer box, label, packaging.

Whether the fake original packaging comparison label is different from the original one, the batch number on the label and the batch number on the chip should be the same. The original packaging is very regular, and some will have anti-static bags, but not all manufacturers' products will have anti-static bags. If it is an unopened anti-static package, the tube or tray inside should be clean after opening. If there are plastic foam or shock-proof plastic bags, these accessories from foreign big factories are difficult to imitate in China, and the difference can be seen. Take a few films from a tube or a tray and discharge them together. The content of the original product is definitely the same. The position of the typing, positioning holes and feet is relatively neat, and the contents in the positioning holes are also consistent. Of course, some manufacturers are not fixed in positioning holes and typing positions, such as AVAGO.

The original packaging has been opened or there is no original packaging, but the original original goods, and now many goods in the electronic market are such original goods.

2. Scattered new goods: The word "distributed" is mainly used in the aspect of IC chips. The main meanings are:

The customer demand is lower than a whole package. Due to the price drive, the supplier disassembles the original package and sells a certain number of chips at a high price, while the remaining part has no original package.

Due to transportation reasons, the supplier will unpack the original packaged goods for transportation. Original goods like Hong Kong, to be shipped to Shenzhen and other places, in order to reduce tariffs, the original packaging was removed, and many people were brought into the customs.

Due to the management problems of the packaging factory, the employees who shipped the company through the abnormal way, bought the film and flowed into the country. This kind of film has no outer packaging because there is no final packaging process, but the price is sometimes better than the price of the national agent.

Originally produced, used, polished, tin-plated, and the feet are cooled after a series of treatments. The appearance looks good, and it is sold out, also called Sanxin, but it is actually refurbished!

3. Refurbished goods: After the products are produced from the original factory, after use, there is a certain degree of wear and tear. The performance is different from the original factory when it is produced. After special processing, its appearance or performance is restored. Close to the state that the original factory just produced, called renovation!

4. Old goods dismantling parts: the original factory produced, has been used, removed from the circuit board. Not treated with washing angles.

There are two ways to disassemble old goods:

Hot air method, this method is a formal practice for cleaner, tidy boards, especially the more valuable SMD boards.

The "fried" method, which is really true, is "fried" with a high-boiling mineral oil that is formulated, and is often used in very old or messy trash boards. Here, I want to explain to you that if the waste generated during the separation and re-manufacturing 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 the proceeds are recovered, 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. You must be aware of this!

The main methods to distinguish between original goods and refurbished goods are:

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.

Look at typing, generally refurbished (white) with "Tian Na Shui" (chemical thinner) can erase the word is generally refurbished goods, the original goods can not be wiped off. 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 edges of the writing tape and are "saw-toothed", or they are illegible, inconsistent, misplaced, easily erasable or too 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 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, 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 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.

Look at the pins. The pins of the original goods are very neat and like a straight line, while the refurbished ones are not neat and awkward. 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. ", DIP and other plug-in pins should not have traces of wiping, even if there is (repackage will be) scratches should be neat, in the same direction and the metal exposed is smooth and non-oxidized.

Look at the device manufacturing date and the 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. If the label on the bottom of the device is confusing, the device is Remark.

Look at the device thickness and look at the 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.

Look at the positioning holes, observe the positioning holes 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, so be careful!

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 really make new films, but they will definitely tell the customers to go to the warehouse to get the goods, so don't take it seriously!

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 surface of the refurbished chip. The tiny holes are difficult to see with the naked eye. We must use the device. Come observe!