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Teach you a trick to quickly identify the true and false components
Publish：SHENZHEN ENXIC ELECTRONICS CO., LTD,Schottky diodes, rectifier diodes, fast recovery diodes, switching transistors, thermistors, MOS tube, TVS tube, Youze Electronics Time：2017-12-12 Views:889
The components in the market have original goods and new goods. It is one of the necessary skills for each purchase to learn how to identify the true and false electronic components. Before the purchase, the friends complained that there were too many new goods in the market, and every time they wanted to purchase, they were worried about buying new goods. Next, Xiaobian will give you a trick to identify the authenticity of electronic components quickly.
First, in order to distinguish the authenticity of electronic components, we first need to know the difference between the original and the new ones.
What are the new original goods?
New original goods, the original original word, original packaging, the label usually has a complete model, batch number, brand, whole package quantity, code, bar code new goods. All the parameters are qualified, including the original products, which are generally priced.
What is new goods?
The real sense of "San Xin" (that is, no original packaged original goods).
A. customer demand is less than a whole package. Because of price driven, the original whole package is dismantled in supply, and a portion of the chip is sold at high price, while the remaining part is without the original package.
B. supplier due to transportation, packaging intact goods will open, convenient transportation. Like Hongkong‘s original goods to be shipped to Shenzhen and other places, in order to reduce the original customs tariff package, many people with separate entry.
C. old brand new products: most of these goods are goods that are placed for a long time and are not in good appearance. They can only be used for bulk processing.
Two, fast recognition of the true and false electronic components
1, look at the surface of IC chip. On the surface of the chip, there will be fine lines and even the previous micro marks. Some are covered with a thin layer of coating on the surface of the chip. It looks a bit bright and no glue.
2. Look at the print. Most of the chips are printed by laser or printed by special chip printer. The handwriting is clear, not obscure and hard to erase. The refurbished chip or the edge of the handwriting is corroded by the cleaning agent and has a "serrated sense", or the print is blurred, the depth is different, the position is not correct, it is easily erased or overlooked.
3. See the pin. All light, such as "new" tin plating pin will be refurbished goods, the majority of IC‘s pin should be the so-called silver powder foot, dark but uniform color, surface should not have oxidation marks.
4. Look at the date of the device production and the label of the package plant. The marking of the main cargo includes the label of the bottom surface of the chip and the production time should be consistent with the device quality. The new Remark label is chaotic, and the production time is different.
5, measuring the thickness of the device and looking at the edge of the device. Many of the original laser printing of the grinding of the new film (most power devices) to remove the original mark, must be worn deeper, so the overall thickness of the device will be significantly smaller than the normal size, but no comparison or use of a caliper measurement, the general experience is difficult to distinguish, but there is a variable method, that is, to see the side of the side of the device.
If we have a chip that we can‘t judge by the naked eye and experience, we can use a tool, such as a magnifying glass and a digital magnifying glass, to grind the refurbished chip table and have tiny holes that we can‘t see with the naked eye. We have to use the equipment to observe! There are several points:
1) look at typing. Generally refurbished and reprocessed (white) can be erased by chemical thinner, which is generally refurbished, and the original goods cannot be erased.
2) look at the lead angle. The pin of the original goods is very neat and straight, but some of the feet are irregular and crooked after renovation.
3), look at the positioning hole, observation of the original cargo positioning holes are more consistent, the refurbishment of some of the deep and shallow, or fundamentally flattened, and some if careful look can see the original location of the hole marks. In the actual work, we should observe and observe carefully. Some of the counterfeiting techniques are quite high, especially in purchasing.
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