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Pin 1 Notch/Dot Not Visible on M24128-BFDW6TP EEPROM TSSOP-8 Package

ananda95msa
Visitor

Hello ST Community ,

I am currently using the EEPROM part M24128-BFDW6TP (TSSOP-8 package) in a design. However, I’m facing difficulty in locating the Pin 1 marking on the IC. There is no visible notch or dot on the top side of the package that would typically indicate Pin 1, as referenced in the datasheet.

  • The IC top surface only contains part marking text, but no discernible Pin 1 indicator (notch or laser dot).

  • We’ve verified this across multiple units.

  • This is making it difficult to confidently orient the IC for placement.

I’ve attached a clear screenshot for your reference.

Could you please confirm:

  1. The official Pin 1 location with respect to the printed text on the IC?

  2. Whether this is a known marking issue or within tolerance of ST's marking process?

  3. Any additional guidance or recommendations for identification?

    Thanks and Best regards,
    Ananda

2 REPLIES 2
TDK
Super User

Pin 1 is on the chamfered side of the chip.

TDK_0-1752502826916.png

TDK_1-1752502889731.png

 

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mƎALLEm
ST Employee

Hello,

Normally, this is the pin 1:

mALLEm_0-1752503105604.png

 

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