What about this one?

https://www.ebay.com.au/itm/2-pieces-Dallas-S … 675.c100623.m-1

By the way, I don't know if 1287 and 12887 are the same (or compatible) things, but These two are what I purchased to replace my 1287 and both worked:

https://www.aliexpress.com/item/FREE-SHIPPING … .10ef4c4dNmkrss

https://www.aliexpress.com/item/Free-Shipping … .10ef4c4dNmkrss

Both came with Dallas marks on them (probably fake), not like the generic marking on the pictures.

The extra pin is no issue. Both are DS12887A.

However, don't buy these. They are old and pulled, not new as described. For a single, really new Dallss chip you pay at least around 10 bucks shipped. These cheap ones from China a just scam. Mind you, I bought many of these. I only found UK sellers having legit new Dallas chips.

derSammler wrote:

The extra pin is no issue. Both are DS12887A.

However, don't buy these. They are old and pulled, not new as described. For a single, really new Dallss chip you pay at least around 10 bucks shipped. These cheap ones from China a just scam. Mind you, I bought many of these. I only found UK sellers having legit new Dallas chips.

Could you please eloborate on this scam thing a bit more? I bought two and both are currently working (two weeks or so). I have not much experience with them so what kind of bad things I should expect? They will be depleted in very short time or some other thing?

PS: I don't have access to ebay (well, to paypal actually but result is the same) so Aliexpress is the only venue I can take for purchasing things like that.

You can buy Dallas RTC chips from places like rsonline, element14 and other online component stores. They are still being produced and supplied as a standard market item.

They are not expensive, and better than taking the lottery on a Chinese ebay seller.

tayyare wrote:

I bought two and both are currently working (two weeks or so).
[...]
PS: I don't have access to ebay

I don't know how that relates to my post then, but anyway. 😉 Those China sellers on ebay offer the Dallas chips as "new", but they are pulled from old, used systems and have date codes that go back up to the late 1990s. I bought many from different sellers from China. The result was always the same: bent and oxidized pins, scratches all over the chip (probably removed using a screw driver), one even had soldering remains on the pins. And, of couse, they were 10+ years old. One had a still-working battery; it had a date code of 2003.

But all that should be obvious when seeing that they sell 5 pieces for US$ 7 shipped. They are great for modding, however. Which is why I bought so many in the first place.

Thanks for the online names canthearu does anyone know if there is any difference between the DS12887A and the DS12887A+

derSammler wrote:

tayyare wrote:

I bought two and both are currently working (two weeks or so).
[...]
PS: I don't have access to ebay

I don't know how that relates to my post then, but anyway. 😉...

Aliexpress sellers that I can buy are all Chineese 😊

Thank you very much for the information 😀

GabrielKnight123 wrote:

does anyone know if there is any difference between the DS12887A and the DS12887A+

The "+" is just the lead-free version of the component, other than that it's the same.

I found out there is a slight difference in how the DS12887A and DS12887A+ work from out of the box to put it in the old saying, pin 21 looks like it was originally there on my old RTC (DS12887A) and it defiantly was there on the new RTC I ordered online (DS12887A+), but because of pin 21 the time and Bios settings was never saved so I found out by removing pin 21 it worked, just like a bought one. Read this post for more info:

RTC Battery Hack Cut Wires Help