Fake IC's

[spoontex]

Hello,

today I decided to reorganize my stock, and I found 4 Burr Brown's with the same code. I suppose that are totally fake!! or I missed something?

Can someone give me some tips to locate this fake IC's?

Thanks!

[antonis]

In case you mean same Batch/Lot number, there isn't any "fake" on it..

[spoontex]

What do you think about?

[willienillie]

If you ordered them all at the same time from the same vendor, it would not be unusual for them to have the same batch code.

[PRR]

The MC1458 were packaged Nov/Dec of 1985.

I can't make-out the BB chips but since the date code normally covered a week there will be thousands with the same code and they may tend to hang together over the decades in storage.

[ElectricDruid]

+1 what others have said. The date codes are fine and look perfectly valid.

Apparently Burr Brown use single digit codes for Year/Month - details here:

   https://e2e.ti.com/support/data-converters/f/73/t/642262?ADS7800-Logo-marking

(Beware - random information from the internet - YMMV)
The code says 28Z120W which would be year=2 (2002 2012?) month=8, batch=Z12, location=QW

[spoontex]

Awesome, thanks for your replies.

Now I understand more things about IC's codes.

[Rob Strand]

Valid date codes don't mean legit IC's.

There are many youtube videos on Fake/Counterfeit IC's.
It comes down to fine points.

Mark Hammer posted an excellent video in the Lounge section (within the last year).
Maybe this one,  see 17:44 (!),
https://www.youtube.com/watch?v=k72SFBOZ_lw

[ElectricDruid]

Valid date codes don't mean legit IC's.

This is true, but unless you've got some other reason to suspect that something is fake (like "it doesn't work properly", for example!) it's still much safer to assume "genuine" rather than to assume "fake". We don't live in a world that is so screwed up that people are commonly faking jellybean op-amps like the 1458. The Burr Brown thing is worth couple of quid, so could conceivably be faked (take a bunch of TL072s, wipe the marking, re-mark them, sell them on at ten times the price you bought them) but it still isn't exactly "likely".

People who buy a lot of chips on eBay think that the world is full of fake chips. People who use proper electronics stores with traceable inventory don't think that faking is such a big problem. Coincidence? I doubt it.

[Rob Strand]

This is true, but unless you've got some other reason to suspect that something is fake (like "it doesn't work properly", for example!) it's still much safer to assume "genuine" rather than to assume "fake".

Maybe so.  I guess I have no confidence in ebay.    I'm pretty sure a lot of people who buy esoteric opamps off ebay don't test them in detail and don't know they really have remarked MC1458's  .    Maybe exaggerating a bit but ...

People who buy a lot of chips on eBay think that the world is full of fake chips. People who use proper electronics stores with traceable inventory don't think that faking is such a big problem. Coincidence? I doubt it.

It can end-up being one of those "you get what you pay for" stories.