Because there are many kinds and similar shapes of charging heads in the market, it is difficult for ordinary consumers to tell how to distinguish the authenticity of a 20W charger. Here is a simple judgment method. By judging the serial number on the charging head, the accuracy is very high.
The logo of Apple's 20W charger consists of a set of 17 digit serial numbers, and each letter represents some special meanings. If you carefully compare the serial number of the charger in your hand, you will definitely find the problem.
The following is the meaning of serial number:
1 and 1-3 are OEM codes.
Selcon F 16
Flextronics C4H
Flextronics FNT company of India
20W has only two foundries. Other beginnings, such as C3D, are false.
2. The fourth digit is a number, representing the year of production. A newly discovered foundry started with Flextronics FNI and Ou Yi Digital.
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At present, it can only be 0 or 1, which means the production year is 2020 or 202 1.
3. Numbers 5-6 represent specific production weeks.
There are only 53 weeks in a year, so this number can only be between 0 1-53:
Moreover, because the 20W leader was released in June of 20 10 and the new model 12, this number is generally not less than 30, and the numbers below 30 are basically false.
Note: the product produced by 202 1, that is, the fourth serial number is 1, don't care about this.
The seventh digit represents a specific day of the week.
There are only 7 days in a week, so this number can only be one of 1-7.
5. Bit 8- 1 1 is a random serial code, and these four numbers are different for each header.
The number 12- 15 is a fixed code, which will be fixed for at least several years.
Selcon F 16 fixed code PMG9
Flextronics C4H fixed code PF4M
The fixed code of Flextronics FNT in India is PNK.
Anything that doesn't meet the fixed code is fake.
6. The number 16 stands for QC standard, which can only be A or B..
Note: the product produced by 202 1, that is, the fourth serial number is 1, which can only be B.
7. The number 17 is a random internal check code.