how to distinguish Chips IC original binding, loading in bulk, refurbished and secondhand? When we are in the purchase of printed circuit board pcb assembly for components.let's have Topscom tell us.


Since there is no industry standard, it generally depends on experience when distinguishing between true and false IC. If you need to follow the following methods, it may be too late to identify the goods you have on hand. Of course, we will take good care of this level first, please give your comments:).  
 


In fact, unqualified IC can be divided into two categories: fake goods and refurbished goods:
 
There are three kinds of fakes, one is divided into factories with problematic chips lost to the market, so it is generally more difficult to distinguish! The second is pure fake goods; the third is some goods that come to the market through normal channels, and then some defective bad films, such as those that cannot be burned, may be sold on the market by some irresponsible people! original author: mr. lixi yang china part-time Internet Internship journalist, posted by: china famous pcb design,pcb assembly,oem odm electronics contract manufacturing supplier-topscom
 
 
There are two ways to disassemble the old film: 1, hot air method, this method is a regular practice, used for cleaner, neat boards, especially the more valuable SMD board. 2. The "frying" method, which is really true, is "fried" with prepared high boiling point mineral oil, which is usually used for very old or messy garbage boards.
 
Here, I would like to make it clear to you that if the waste generated in the process of old film separation and reproduction is not properly disposed of, it will seriously pollute the environment (including a large number of refractory toxic compounds and heavy metals), and the cost of "proper disposal" will be higher than all the recovered income, so some companies in developed countries would rather spend money and freight to "send" electronic waste to some countries in China and South Asia rather than dispose of it on their own. There is a "say" in it. The price difference between new and old chips is far from being able to recover the loss of environmental pollution, which we must know!

 

The main way to distinguish between original goods and refurbished goods is:
 
1. See if there are any signs of polishing on the surface of the chip. Where the polished chip surface will have fine lines and even previous printing micro-marks, some to cover up the chip surface is also coated with a thin layer of paint, looks a little shiny, no plastic texture.
 
 
2. Read the printing. Nowadays, most of the chips are marked by laser or printed by a special chip printer, which is clear, inconspicuous, not blurred and difficult to erase. The refurbished chip is either "jagged" on the edge of the handwriting corroded by the detergent, or the print is blurred, different in depth, misplaced, easy to erase, or too conspicuous. In addition, the IC screen printing process has long been eliminated, but many chip refurbishment due to cost reasons still use screen printing process, which is also one of the basis for judgment, screen printing will be slightly higher than the chip surface, with the hand can feel slightly uneven or have a astringent feeling.
original author: mr. lixi yang china part-time Internet Internship journalist, posted by: china famous pcb design,pcb assembly,oem odm electronics contract manufacturing supplier-topscom
 
 
3. Look at the pins. Where bright as "new" tinned pins must be refurbished goods, the vast majority of authentic IC pins should be the so-called "silver powder pins", dark color but uniform color, the surface should not be oxidation traces or "flux", in addition, DIP plug-ins should not be scraped marks, even if there is (re-packaging will have) scratches should be neat, in the same direction and metal exposure is clean and non-oxidation. (note: many of the original IR shipments have tin feet. ).
 
 
4. Look at the production date of the device and the label of the packaging factory. The label of the authentic goods including the label of the bottom of the chip should be consistent and the production time should be consistent with the product of the device, while the label of the refurbished piece without Remark is chaotic and the production time is different.

Although the front label of the Remark chip is the same, sometimes the value is not reasonable (such as what "lucky number") or the production date does not match the product of the device. If the label on the bottom of the device is very confused, it also means that the device is Remark.
 
5. Measure the thickness of the device and look at the edge of the device.

 

How to avoid buying fake products (IC integrated circuits).
 
Integrated circuit, fake goods first look at the supplier.
 
If it is the agent's goods fake possibility is very small, but sometimes there will be impersonation agents, it is best to go to the original factory website or phone to confirm whether they are really qualified as an agent. How not to rest assured, you can ask the agent for the original factory invoice (Shipping List), there is generally no price; if it is a trader, first reverse investigation, if the office space is more simple, enhance vigilance; office space and the actual registered address is inconsistent, enhance vigilance; fewer office staff, enhance vigilance; registration time is less than 1 year, enhance vigilance; less registered capital, enhance vigilance; There are few office phones, and some do not even have faxes, so be vigilant; if there are no special websites and corporate mailboxes, be vigilant; and then ask a positive question: does the other party know anything about the product itself? Such as brand name, package, grade, type, characteristics, etc. Can I issue a VAT invoice? Whether the VAT is a formal 17-point ticket for the company, or a 4-point or 6-point ticket issued by the national tax agent, or the company is unable to issue a ticket at all. If you are still worried, ask the supplier to fill in the credit survey report and whether you can provide a list of 3 customers available for investigation for third-party transfer.

Check? Based on this understanding, Li Kui or Li Gui should have a preliminary judgment, but this is still the first step.
The second look at the model.
 
In fact, there are only the following kinds of fakes, but the technology and means are unpredictable:
 
 
1. Renovate after dismantling the machine (chemical cleaning, if you are lucky, you may still be able to use some, which are fake and shoddy products).
 
These chips are removed from the circuit board and then classified, the pins obviously have solder solder marks, bright, pin spacing is obviously different, the surface printed text and pattern size, font, depth are different, the production batch number is generally different, the origin mark on the back is more miscellaneous.
 
 
2, polish the film after dismantling (chemical cleaning + physical grinding + laser engraving + mimeograph + screen printing).
 
These chips are very similar to brand-new chips, the size and depth of printed text and patterns on the surface are basically the same, and the batch numbers are the same, but if you look closely at the chip surface, you will find that there are many tiny parallel scratches on the surface, and the origin marks on the back are also different. the pins are generally not shiny, but Matt, there are signs of oxidation, the distance between the pins is more consistent. Generally speaking, the polished film is mainly a brand-new film that has been put for too long, or the batch number is relatively miscellaneous, and it is polished and printed into a unified and relatively new production batch number in order to sell.
 
 
Some of them are polished according to the original model, which is not bad and belongs to fake and shoddy products. Others are commercial grade to industrial level, industrial level to army level, military level to 883 level, low rate to high rate, low frequency to high frequency, and so on. The purpose of the change is self-evident, but what is more, simply change it at will, and it will be strange if you can buy it and use it.
 
 
3. Domestic brand change (laser engraving + manufacturer collusion).
 
At present, many domestic products are similar to foreign products, but some performance indicators may not be achieved.
 
These are mainly discrete devices, passive devices, connectors, connectors. For example, the pipes of FSC and the connectors of AMP are a mess made in China. There are counterfeits that are not fake and shoddy, and there are also fake and shoddy. Oh, maybe you have bought it, but you just don't know it. Just like now people all over the street are wearing 'famous brands'.
NIKE, adidas,CK, LV, LEE and so on, this has become the stubborn disease of Chinese economy, is the malignant tumor of Chinese market, NND …. Let's talk about components.
 
original author: mr. lixi yang china part-time Internet Internship journalist, posted by: china famous pcb design,pcb assembly,oem odm electronics contract manufacturing supplier-topscom

 
 
4. Copy the board to change the brand.
 
I don't know how to say this, whether it is the so-called "stepping on the red line" or crooked ways, anyway, it belongs to a dangerous industry. It is really difficult to distinguish this kind of product, only from a comprehensive point of view.
 
 
5. Original wafer self-packaging.
 
This should be "the best", but not all wafers are available, and not all packages can be done domestically without comment. Alas. Our country does not lose talents, and the right path in the world is the vicissitudes of life. I hope that these "parallel importers" can become a "regular army" as soon as possible.
 
 
6. Loose new film.
 
The size, font and depth of the printed text and patterns on the surface of these chips are different, the production batch numbers are generally different, and the origin marks on the back are miscellaneous, but the pins do not show traces of use, but there are traces of oxidation. Generally speaking, this kind of chip is sold in one tube by traders who collect unused wafers from various sources.
 
 
7. Original new film.
 
The size, font, depth, production batch number, origin mark on the back of the printed text and pattern on the surface of these chips are very consistent, the pins are very neat, there will be a bright hate in the middle of the Matt surface, and the tube words installed on the chip are very new and transparent. Not yellowing.
 
 
8. A little bit of advice.
 
Among these second-hand chips, the reliability of the detached chip is the worst, the reliability of the loose new chip is the second, and the reliability of the polished chip is better.
 
 
In addition, try to buy brand-new chips during programming, and second-hand chips have a very high failure rate for programmable devices.