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

[ananda95msa]

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

[TDK]

Pin 1 is on the chamfered side of the chip.

 

[mƎALLEm]

Hello,

Normally, this is the pin 1: