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Old 26th January 2011, 03:20 AM   #11
norture is offline norture  Indonesia
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Quote:
Originally Posted by bichi View Post
...if newer parts are "laser-imprinted," as opposed to "printed."
I heard one guy here at a local electronics store mentioned that nowadays current batches of LM3886T/TF come with laser-imprinted markings.
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Old 26th January 2011, 05:19 AM   #12
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Yup, the current batches (probably RoHS-compliant) have fine laser engraved markings, and an 8-digit batch code as opposed to the earlier 6-digit JMxxyy batch codes.

Another feature of the genuine parts is clean right-angled lead bends, as opposed to curving bends on some fakes.
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Old 26th January 2011, 06:52 AM   #13
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well for comparison here are a couple of pictures of my LM3886TF's I have no reason to suspect they are fake, they work fine

The leads on db!'s pic really look dodgy, even bichi's did at first (the profile shot shows them better) but I think it was just the camera angle.

Note that the second pic I have clipped off the NC leads since I was using them in a very tight P2P implementation.

Click the image to open in full size.
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Old 27th January 2011, 04:37 PM   #14
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I got some from a shady ebay seller (sigh) and just sent them back for a refund.

Click the image to open in full size.

the one on the far left is a known good (real brand) device. the other two on the right came from the same seller where I got the set of VERY fake blue trimmer pots from.

the trimmer pots, fwiw:

Click the image to open in full size.

any parts you buy from ebay - assume they're fakes unless you KNOW otherwise. (deep sigh)
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Old 28th January 2011, 10:53 AM   #15
bcmbob is offline bcmbob  United States
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Comming from the other side of the issue - does anyone in the chip amp community have a source for valid LM3886TF's. If there are original manufacturerers producing the chip there must be a reputable supplier somewhere.
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Old 28th January 2011, 01:04 PM   #16
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go to the main supplies. I would completely and fully trust digikey, mouser, newark, jameco and companies like those.

can't you also buy direct from national, too?
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Old 10th February 2012, 10:45 AM   #17
mrVetz is offline mrVetz  Croatia
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Default My experience

I ordered a set of 4 LM3886TF from a Chinese seller via eBay and then saw the thread about fakes. Then I ordered samples of the same chip directly from National. I received both and they are identical, new laser etched serial numbers and everything. There is a minor difference in the casing between the chips that have V8 and U12 impressed into the small circle in the bottom right corner of the chip. I received both V8 and U12 chips from the factory and from the seller so I guess the china-man gave me the real deal.

Guess I'll have to solder them up to hear the potential difference but I'm an optimist and expect no difference.

eBay seller: "ordoer"

BTW, I once ordered a pair od LM4562 opamps from eBay to pimp my Marantz CD-Player...these were in fact fake, the output was noise/distortion and minor traces of music. Then I put in LME49720HA (I recommend these) I got directly from National and all was well, better than that

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Old 10th February 2012, 11:29 AM   #18
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I always try to go with authorized distribuitors, no more eBay - especially from China.
Problem is widespread: “Suspect Counterfeit”: Fake Electronics US Defense Equipment
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Old 10th February 2012, 04:18 PM   #19
johnr66 is offline johnr66  United States
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Got some TDA2040s off of the 'bay. One had DC rail on the output. The others worked and sounded okay, but max output voltage swing was less than authentic parts. Also, they had no built in protections. I decided to get rid of the fakes, so I put them on a breadboard and fed them a signal and shorted the output. The fakes popped in a fraction of a second. I tried a known authentic one, and it would never blow after shorting for several seconds and trying several times.
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Old 22nd January 2013, 06:03 AM   #20
Mihkus is offline Mihkus  Estonia
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Its too damn hard to find cheap original parts...
I bought set of components for stereo TDA1514A amplifier...
Well, the legs of the ic looked shiny, like there were brand new, they looked really good :O
But damn, no protection at all, of any kind!
Pushed both of them over the limit with output of 31V 2,11A! and one of them blew apart.
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