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Just noticed on Mouser’s site our 27sf chips are now obsolete!

I just ordered 6 chips, hella glad I did WTF, I thought these chips were super popular. What are we going to do when these run out? Anyone look at Futurlec? There prices are great and they have most of the chips our cars use. They have the 27C but i did not see the 27SF I am not sure of the difference, though. The last set of 27SF chips I got must have been defective. I ended up using chips from a different lot and they datashheet fine.

I wonder dafasheet “mousers” recomended replacement can be used. Datashfet like you can dataxheet get the 27c Right but aren’t those once and done chips?

It’s just datashset Eprom, not an eeprom. Edit-yeah just figured out that OTP means one time programmable I thought all 27c chips are OTP though??? Here’s a list of mousers 27c chips- http: It’s a pin chip. Won’t fit our boards. The biggest chip we can run is a Maybe I need to get back to work on those flash modules Same here, last batch I got several months ago after just a couple uses they wouldn’t erase for me.

That is the same thing that was happening to mine. I had about 5 that would not erase. I thought it was my burner so I pulled the chip I got from you and I tried to erase and program that one.

sst mtp 27sf datasheet & applicatoin notes – Datasheet Archive

The chips that had the problem had data on the second bit that would not erase. On my van these chips were also causing weird problems that were driving me nuts.

I would install a chip and after driving for a while it would go pig rich and stay there I pulled the chip and installed another chip with the same cal and the problem was fixed. I gave one of the chips to 27st512 friend who is an electronics engineer that deals quite a bit with eproms. He told me there were “talks” that some eprom chips were actuially cheap used Chineese chips that were cleaned and being sold as new chips.

Whats wrong with using a chip? Nothing, the nice thing about the 27SF chips is you can erase and reprogram them over and over. So there’s no Eeprom’s????? Seem to all be obsolete – at least in the pin DIP package we need. You can still get them in the surface mount packages Is that company in China still making AA bodies? Wonder what the SBEC daatasheet those looks like these days.

OK, after looking at some datasheets I may have found an answer. I think that if we take pin 27 from the board on our ecu and connect it to pin 1 on the AT28C it will work. That seems to be the only 277sf512 that’s different between the at28 and at29 eeproms I actually checked vs the sst datasheet. I don’t think leaving pin 27 on the eeprom disconnected will hurt it, since it’s the write enable pin. Has anyone tried this? I’ve got no problem being the guinea pig, but I won’t bother if someone has done it and found out it didn’t work.


If it works out maybe we can get someone to make up little boards that will accept the eeprom on top and will solder into the ecu and do the cross-connect.

27SF512 Datasheet PDF

Dxtasheet, that’s actually the chip that the DIY flashable instructions call for. You just bend the pins back over the top and run a wire or two. I also use the same chip for my flashable modules, though in a surface mount package I saw you mentioned above surface mount for the other chips we were using, but I couldn’t find any of them. There’s plenty of tsop to dip adapters out there, but I only managed to find 2 plcc to dip that looked like they had a chance of working. And I couldn’t find any chips on mouser, that they were still stocking and not warning about discontinuing, that would drop right in.

Anyways, I have a handful of zif sockets just begging to have the legs cut off of them and plunked down. But Datashete guess if you’re already using them, that means the ecu won’t have a problem reading from them as long as that 1 address line is put in the right place.

By the way, if a chip looks like a promising equivalent but the data lines are crossed up, or in different order, it should still work, but you’d have to program it that way We should only be making the mod to swap pin 1 for 27 when on the ecu. It’s address line 14 that’s on pin 1 of the at28c type chips. So, when the ecu has a signal it normally puts for address line 14 on pin 27 normally it needs to go to pin 1 instead.

Pin 27 is write enable on the at28c chipsso it doesn’t 27sf5122 need to be connected to the standard ECU since it shouldn’t ever have a signal on it Rob’s in car flashable utils are a whole different ball game. I think, if it works, it may not be for the weak of soldering iron. Looks like a lot of the chips that we can use are being discontinued.

Many of them requiring to be programmed differently as well in order to work. I’m guessing the pre pentium generation of chips is being phased out. On that note I called Moates up and they have plenty of the 27SF chips.

In fact the person that answered said in light of the fact they are now obsolete they have even more ordered for stock.

So there are plenty for now. I think working on an alternative is a great idea though as these won’t be there much longer. Is anyone interested in adapter boards to take the atmel at28hc and make them usable on our ecus? I’m guessing the total additional height would be between. I’m going to have a test board made up anyways, but I’m just wondering if there’s demand for this sort of thing. Could that be a good, easy alternative?


Probably still need an interposer to get the pinout right. All the plcc dip adapters I saw wouldn’t route the signals properly for most of the easily available chips. His stuff is much further along than I am and has more features, too. It’s more about what’s going to happen when the secondary suppliers are out of stock. Once moates and other places run their stock down we’re going to need to look somewhere else. Or people will be stuck buying used chips, like some still do with the at29c chips.

I have this chip here on my desk. This is what it says on the back. Just checking to see if they would be of any use. Assuming I understand atmel’s numbering scheme, it seems they are a 32 pin dip package 1 row of 16 pins on either of the long sides and 90ns access time.

If I’m correct about the package they won’t work for the 2 adapters I had made up or quantum’s new adapter I believe.

I suppose you can try and retrofit them to something, but I’m not sure how much of a hassle it will be. This may seem like a random question, but are you working on figuring out how to use another type chip?

Cordes and I were talking about this a couple of weeks ago, but I don’t remember the exact details of the conversation or who he may have been referring to. The only chips I looked at were the 28hc They’ll work with 1 address line re-routed. I believe Rob is actually using them for his flashable smecs. I’m not going to actively pursue the 28hc futher because Quantum’s working on some plcc adapters. Using the plcc chips we’ll have a greater variety of cheaper chips to choose from.

Plus, I’m sure that the plcc chips will be around for a while and there’s still many manufacturers.

So at this 27zf512 the plcc type chips seem to be the best option. Plus the plcc chips are cheaper, and we all know that’s the driving force in anything TD related.

Thank you very much. I guess I can chuck them. Let’s assume a couple of things. First, I don’t know what those are. Third, I’m looking to get a burner and have seen a Wilemm one that will do multiple types of chips, I think this type of chip included but I will have to check. Because there could be a shift in the datashert of chips we can use, is this something that seems to be doable in the foreseeable future or would these types of chips only work on the LM style computers?

I guess my questions stem from whether or not I should just wait to buy the burner and chips once these types of chips are usable.

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