SOP44 28F400 Flash Replacements

Thread Starter

narkeleptk

Joined Mar 11, 2019
540
Anyone know off hand any modern day direct replacements for intels old 28f400/28f800 sop44's?
I have some stuff I work on where its common I need to replace them,. I have been using leftovers and scavenged ones from junk stuff but starting to run low now. Would prefer something new rather then buying from ali but haven't had a chance to really look into it yet.
 

Irving

Joined Jan 30, 2016
2,058
I think that the AMD AM29F400, also available from Cypress, are pin compatible, but whether they are functionally equivalent I haven't validated. Available from Farnell and others.
 

Thread Starter

narkeleptk

Joined Mar 11, 2019
540
Thanks, Looks to be pretty close. The VPP @ pin 1 on the 28f and its NC on 29f.
I'll have to check my units to see if that is connected.

Clipboard01.jpg

VPP =
PROGRAM/ERASE POWER SUPPLY: For erasing memory array
blocks or programming data in each block, a voltage either of 5 V ± 10%
or 12 V ± 5% must be applied to this pin. When VPP < VPPLK all blocks
are locked and protected against Program and Erase commands.
 
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