An IC(IntegratedCircuit) is a chip that integrates many microelectronic components (such as transistors, resistors, capacitors, diodes, etc.) on a plastic substrate. Integrated circuits. In a broad sense, the concept of IC chip is the general term for semiconductor component products.
Domestic IC market has a lot of IC terms: bulk new goods, refurbished goods, original word original foot goods, new original cargo.
Spread the new goods:
There are two new products. One is the goods that manufacturers enter into the market before entering QC. The yield is not very high. The other is unused, unpackaged and potentially oxidized goods.
These goods are recycled through the profit margins of some domestic enterprises and various channels, and are changed to new lot numbers based on type, packaging, weaving and typing. Another is the most terrible buyer of the same IC packaging model, but not the same brand or the same function of the IC through typewriting refurbishment, imitation model, this kind of goods, will bring huge losses to the procurement factory.
Original cargo: Original cargo:
To put it bluntly, this commodity is a disassembly part. There are some IC chips, simple packaging, can be wiped and written repeatedly. By disassembly, they were disassembled and transported to the market twice. This kind of goods is usually very cheap.
There is no need to explain this. The product is certified by QC after entering the market of the original factory products. Generally, the price may be higher, but the quality must be up to standard.
The method of identifying the authenticity of IC chips is as follows:
Optical microscopy is usually used for visual inspection to check whether the chip's commonness, surface printing, equipment body and pins meet specific requirements.
X - ray detection:
X-ray fluoroscopy is a nondestructive inspection method that can observe the internal structure of an object from multiple angles. X-ray fluoroscopy to check for physical defects in sealed grains, lead frames and gold wires of the equipment under test.
Acetone wipe test:
Acetone wipe is to periodically wipe the screen chip surface with a certain concentration of acetone, the result is to determine whether the chip surface is reprinted.
Opening cap is a physical and chemical test, which dissolves epoxy colloid on the outer surface of the chip and retains intact particles or gold lines, so as to facilitate the inspection of important particle surface marks, layout, process defects, etc.
Use SEM/EDS to inspect the pins or terminals of parts for lead and provide test data and report.
Electrical test/functional test:
IV curve tracker and probe table are used for curve test of IC pins and gold lines after opening, including mass production test, short circuit test and leakage current test.