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High failure rate of Maxim Integrated DS1245YP-100 chips on TDS7000 scopes
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Jwalling:
This is really starting to bug me. Over the last few years, I've repaired 10 or so Tek TDS7000 series scopes that had a bad Maxim Integrated DS1245YP-100 chip. This is the surface mount part with the PCAP snap-on battery. Some would fail the R/W test on the PPC board boot diagnostics, one failed the R/W test during self test when the scope was booted up, and  at least 4 now I have seen would draw excessive current when the scope is powered off. On my bench now is a TDS7104 whose DS1245YP-100 chip draws 100uA when power is off. Since the battery is rated at 130mA, that would give about 1300 hours or 54 days of battery time.

Worse yet is the price of these POS chips keep going up! I bought one on Dec 16th 2016 for $38.65 USD. Now they are up to $46.65 just 4 months later from Digikey! |O

I hate Maxim. You SUCK! If it wasn't bad enough that (some of) your chips are unreliable and your prices keep going up, you EOL parts with no suitable substitute - just look at the guy in this thread:

https://www.eevblog.com/forum/repair/repair-of-tek-tds3014b-need-a-source-for-a-ds1742w-nvram/

Not to mention the DS1486 which is in all the Tek TDS700 and some TDS600 series scopes. If you need a replacement, you better be ready to buy from shady sources, or be willing to do some surgery on the chip to wire in a new battery.

Grrr...  :rant:

Oh sure, I could buy this for $16:
http://www.ebay.com/itm/1x-IC-DS1245YP-100-/162118885220?hash=item25bf09df64:m:m8H-_pMo49zXYGK9mk5EgNQ

But I'm not so sure I would trust it. He's sold 11 of them so far, so it looks like other folks are seeing these fail as well.

Is anybody else seeing these chips fail more than what would be considered normal?

EDIT: Typo. I always make typos when angry!
Pinkus:

--- Quote from: Jwalling on March 20, 2017, 12:22:49 pm ---I hate Maxim. You SUCK! If it wasn't bad enough that (some of) your chips are unreliable and your prices keep going up, you EOL parts with no suitable substitute ...

--- End quote ---
This is the reason why i try to avoid Maxim-only products and many other developers do too. I also learned this the hard way.
Jwalling:

--- Quote from: Pinkus on March 20, 2017, 12:36:44 pm ---
--- Quote from: Jwalling on March 20, 2017, 12:22:49 pm ---I hate Maxim. You SUCK! If it wasn't bad enough that (some of) your chips are unreliable and your prices keep going up, you EOL parts with no suitable substitute ...

--- End quote ---
This is the reason why i try to avoid Maxim-only products and many other developers do too. I also learned this the hard way.

--- End quote ---

 :-+
Good! I wish every engineer would stop using their crap!
nctnico:
It could be interesting to replace it with a small PCB containing an FRAM. This shouldn't be hard to make and the 128k * 8 FRAM ( FM28V100-TGTR from Cypress) costs around $20 in single quantities.
Tomorokoshi:
Dallas Semiconductor Novrams with the built-in batteries, now owned by Maxim, are known to have been counterfeited. Are the Maxim ones a rebranding of the old Dallas parts? Perhaps the counterfeit ones also got that labeling.
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