Electronics > Beginners

W27C512 EEPROM Frustrations

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edavid:

--- Quote from: wraper on January 06, 2020, 07:51:13 pm ---
--- Quote from: edavid on January 06, 2020, 05:53:55 pm ---At least they have signatures and are 100% testable.  For a hobby or repair project, isn't that good enough?

--- End quote ---
Both SST27SF512 and W27C512 have ID code, so moot point. What I know there is virtually no genuine SST27SF512 in DIP package on ebay. Actually you'll get re-marked W27C512 at best as supply of SST27SF512 is much scarcer and it's more expensive. Or more likely re-marked OTP EPROM.

--- End quote ---

So far I have had a 50% success rate buying SST27SF512s on AliExpress @ $0.60.  I just got refunds on the bad ones and moved on.  For hobby projects that's OK.  Fortunately there are not many cases where you need DIP28 512K parts.

It's easy to find real windowed 27C512s in the US, so I don't think I would bother buying OTPs.  Flash is so much more convenient though.

CRCLARKE:

--- Quote from: edavid on January 06, 2020, 08:03:37 pm ---

So far I have had a 50% success rate buying SST27SF512s on AliExpress @ $0.60.  I just got refunds on the bad ones and moved on.  For hobby projects that's OK.  Fortunately there are not many cases where you need DIP28 512K parts.

It's easy to find real windowed 27C512s in the US, so I don't think I would bother buying OTPs.  Flash is so much more convenient though.



--- End quote ---

agreed

Its much easier to deal with counterfeits when you know when and where they come up. At least you can hedge you bets and expect losses

hermitengineer:
If you're okay with one-time programming, Microchip still makes a 27C512.  Or, at least, Mouser still has them in stock.  On the bright side, that saves you from building an eraser.

https://www.mouser.com/Semiconductors/Memory-ICs/EPROM/_/N-488ye?Keyword=27c512&FS=True

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