Marking of MFRC522 is Strange and Dubious

Forum / MIFARE and NFC Reader IC`s / Marking of MFRC522 is Strange and Dubious

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  • 13. June 2019 at 5:59

    yewkee
    My customer asked about the chip marking on a MFRC522.
    Everything looks normail except for the bottom line that
    reads " TSD1714 ". According to NXP document of MFRC522,
    "TSD" is defined reasonably. But YWW (Year WeeK Week) for
    "171" is possible to understand. Is it year 2001 & Week 71 ?
    And the last letter "4" is not defined at all.

    Does anyone have information on this ?
    I hope this is not "cloned MFRC522 " .

    Thanks.
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    Re: Marking of MFRC522 is Strange and Dubious

    13. June 2019 at 8:45

    TapLinx Support
    Hi,

    I would say that “1709” means week 9 in 2017. TSD1714 is an internal code.

    The TapLinx team
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    Re: Marking of MFRC522 is Strange and Dubious

    13. June 2019 at 9:03

    yewkee
    Dear Sir/Madam,

    If you look at the attached definition document, it does not tally...

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