Need help with recognize ​M27C801 SINGAPORE

[Perets]

Hello, world. I try to find answer how read that code: 2020L. 

Full text on chip are: 

M27C801

-100F1

52987

-2020L

SINGAPORE

That 2020L need read like: WWYXX? Or YWWXX? Thank you for answer. Regards 

 

[mƎALLEm]

Hello @Perets and welcome the the ST community,

That product has been obsolete for years.

To answer your question and I'm not sure that's the week of the fabrication: year: 2000 week: 20.

[Perets]

I'm very sorry that I post first in wrong topic, sir. Thank you for answer! But how can be sure? Question are: if that possible that very old ST chip manufactured in 1992? Thank you for each information, sir. Regards 

[Peter BENSCH]

There is also a PTN 10/5894 (Product Termination Notice) from 2010, according to which all EPROMs were last delivered in 2011 - so, as @mƎALLEm said, a very, veeeery long time ago.

Regards
/Peter

[Perets]

Thank you very much, sir. Question are: chip can be from 1992 or no? And, can be that from years2020? Thank you very much :folded_hands:

[mƎALLEm]

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@Perets wrote:

But how can be sure? 

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No one can be sure here and EPROM devices have been depricated for a long time ago and no ST employee can give the verdict.

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@Perets wrote:

Question are: if that possible that very old ST chip manufactured in 1992? 

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I'm deducing the age of that part number from the datasheet first release date (I'm just speculating here). First release date is september 1998. So I suppose the device was born around that date.

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@Perets wrote:

can be that from years2020? 

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No. That doesn't make sense.

[Perets]

That very good answer, sir! Let me wait 24h (maybe somebody else can add something) and I will accept your answer like a solution. Again, thank you very much.