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Old 25th January 2011, 01:03 AM   #1
norture is offline norture  Indonesia
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Question LM3886 fakes??

Someone in one of the LM3886 threads mentioned there ARE fakes of LM3886. Can anyone post an example or two? Because I think faking an IC is a big and hard thing to do so I doubt it..
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Old 25th January 2011, 08:21 AM   #2
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Quote:
Originally Posted by norture View Post
... I think faking an IC is a big and hard thing to do so I doubt it..
It may be hard to fabricate a counterfeit IC with the same specs as the original, but it's probably not that hard to take a lower-spec IC and re-package or re-mark it as a higher spec IC.

One could take a TDA series chipamp die like the TDA2050, add another die for the mute logic and package them together as a (fake) LM3886.

Alternatively, one could take an LM3876 and remark it as an LM3886 - even experts will be fooled.
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Old 25th January 2011, 12:36 PM   #3
Tarzan is offline Tarzan  Belgium
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I had a few (2) fake TDA1514 power chips.
The writing whas a bit different then from the original.
Allthough this is not the criteria for being a genuine or fake part.

Here is what happend:

After installation the chip lasted for about .1 second...
Used the second chip with current regulated power supply; draws excessive current on the negative side.
Bougth another from a reliable supplier in Germany; the unit works as supposed to be.
So I must conclude that your chips are fake.
I hope it's a one-off problem and not for all your chips. That would be bad, very bad.

The seller payed back the full amount of both chips.

If the price is cheap; take care...
Tarzan
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Old 25th January 2011, 06:52 PM   #4
jaycee is offline jaycee  United Kingdom
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They also acquire factory rejects and sell them... or they sell an empty package, looks like the real thing, but has no die in it so it doesnt work at all.

Sadly eBay is the main outlet for these things - not worth the risk any more, too bad as that's where I got mine for a good price.
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Old 25th January 2011, 07:03 PM   #5
el156 is offline el156  Portugal
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There are lots of fake 2SA1301/2SC3280 in the market. The real ones cost 30 Euros an the fake cost 3 Euros......made in china.
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Old 25th January 2011, 08:21 PM   #6
db! is offline db!  Canada
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Here's one I got off ebay; the defects are glaringly obvious...

Click the image to open in full size.
Click the image to open in full size.
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Old 25th January 2011, 09:01 PM   #7
bichi is offline bichi  United States
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For comparison, LM3886 from National Semi samples program, circa 2008
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File Type: jpg Nat-LM3886-2008-s.JPG (139.4 KB, 940 views)
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Old 25th January 2011, 09:28 PM   #8
db! is offline db!  Canada
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I have a hard time believing that those are real...
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Old 26th January 2011, 12:32 AM   #9
norture is offline norture  Indonesia
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Whoa! I never know that those are real fakes! Fortunately mine's look like the one posted by bichi.
It's a shame that they'd do business like this when we DIY'ers are just, well, doing our hobby and taking it for granted.
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Old 26th January 2011, 02:08 AM   #10
bichi is offline bichi  United States
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Two more possible clues:
- weight: 5grams (+/- 0.2grams) (uninsulated tab "T" version)
- appears the tab is copper with a tin/nickle/cad plating.

note:
- parts acquired 2007/2008.
- don't know if newer parts are "laser-imprinted," as opposed to "printed."
Attached Images
File Type: jpg Nat-LM3886-2008-w-s.jpg (80.8 KB, 815 views)
File Type: jpg Nat-LM3886-2008-ed2-s.JPG (80.3 KB, 800 views)
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