I2C Level converter

I bought 10 of these off ebay.

They work......for about 6 hours. Then they just block everything. Anyone else have an issue with these or did I just get a bad batch?

That's very weird. I assume you have tried resetting everything, cutting the power ...
Do you have a link of where you bought them? Maybe read the reviews of other buyers?
If you have a link, please post it here.

A badly-behaved slave can lock up your entire program. Are you sure you're sending all the right commands and the slaves are responding properly?

Not that you'll believe it but in all likelihood, the source of your troubles is something you've done wrong. It is far better to ask yourself how you can test this device to prove that it either works or doesn't rather than assume you got a "bad batch".

The 5 volt logic goes on the "A" side. Do you have it connected that way? How many I2C devices are on the bus and how long are the wires?

mrred128:
They work......for about 6 hours. Then they just block everything. Anyone else have an issue with these or did I just get a bad batch?

And even after you remove the power from the project, or otherwise reset it, the logic level converters never ever work again ?

I wasn't looking for new ways to diagnose the problem. I have 40+ years in electronics, 35 in digital and 30+ in programming (professional), of which I have always been involved in microcontrollers along the way. Please accept what I have stated to be just a matter of fact.

Although I have not reverse engineered this product, I have gone through 5 of them and is evident it is not of sound design. This should have been a drop in replacement for a bipolar/schottky level converter I have been using in the past. Not rocket science.

The ebay seller is of good standing but no longer lists this product. My initial tests were only a few moments long and they worked. The seller got an acceptance and we are done. I am not bitching about the seller. I am confident the seller has/had no idea what they are selling, which is the norm on ebay.

What I am interested in locating ones that do not fail.I am not stuck, as I have gone back to the transistor/diode circuit I used before. I would just prefer something I no longer have to construct.

If you are so experienced - what "Then they just block everything." means? You should be able to describe it better. Without better description it is nearly impossible to guess what went wrong. Also some link to this product (possibly from other seller) could be helpful.

Smajdalf:
If you are so experienced - what “Then they just block everything.” means? You should be able to describe it better. Without better description it is nearly impossible to guess what went wrong. Also some link to this product (possibly from other seller) could be helpful.

“block” means preventing any signal going from one side to the other.

The product is no longer listed. I stated that. It is why I posted images.

eBay knock offs - they will be rejects or completely non-functional. The fact it worked at all
is the odd thing. I'd be suspicious they've been overloading your circuit unless you've checked
the voltages were kosher when it did operate.

The 6 hour timescale is odd, failures are usually fairly quick (thermal), or much more random. Perhaps
other factors were involved, like temperature, battery voltage, or some such.

Based on the looks of the soldering, I wouldn't have even given them a try.