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Was looking for 555's in my parts box, and while I did find one NE555, I found a dozen of these, in the same pouch. Wondering if the seller pushed me some slugs, because I can't find datasheet for this part. Not even in the Chinese / Russian parts search sites !!

The form-factor is same as NE555 (8 pin DIP), and markings on top say -

ATML U942
2FB 2
9H07258

and the bottom die sealant says that it's manf'd in Thailand.

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    \$\begingroup\$ Can you add a close-up of package? \$\endgroup\$ – Curd Jan 4 '12 at 11:51
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    \$\begingroup\$ ATML is the NASDAQ trading symbol for Atmel, and they do have facilities in Thailand, so that could narrow your search. They don't manufacture a 555, though they do manufacture plenty of 8-pin DIPs... \$\endgroup\$ – Kevin Vermeer Jan 4 '12 at 14:55
  • \$\begingroup\$ Thanks @KevinVermeer. Google was smarter than me, and did suggest 'Atmel' given the ticker symbol, and I did search Atmel site with U942 (which turns out to be the manf year/week id), and the production lot number, obviously not finding anything. I wonder if there was a better way to search. \$\endgroup\$ – bdutta74 Jan 5 '12 at 4:04
  • \$\begingroup\$ @Curd, missed your comment. I thought of putting the image, but my primary camera is lent out to a friend, and alternative sucks bigtime with macros and low-light. If you believe you'd still like to see the image, let me know and I can post it in a few days. \$\endgroup\$ – bdutta74 Jan 7 '12 at 19:31
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That is an Atmel AT24C512B. Two-wire Serial EEPROM, 2.5V, 512K (65,536 x 8).

See the AT24C512B datasheet page 13 for markings.

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  • \$\begingroup\$ Nice work! ASCII art for the marking diagrams is rather strange, though... \$\endgroup\$ – Kevin Vermeer Jan 4 '12 at 20:01
  • \$\begingroup\$ Wow, now that's a lucky catch for me. 512K serial EEPROM for the price of NE555. Thanks @TevoD. BTW, I did search Atmel and U942 and google returned nothing. And as Kevin says, the marking diagram is rather strange, and no hint of the part. \$\endgroup\$ – bdutta74 Jan 5 '12 at 4:02

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