fake LM3886 ?

Cro maniac · 1st August 2005, 07:32 PM

Today I bought 6 LM3886T chips at my local electronic parts store, but when I came home, I found that one chip differs from the others.

First 5 chips have National logo and JM16AK written in first row, and LM3886T in the second. Something like this:

JM16AK
LM3886T (smiley represents the National logo)

The 6th chip has no National logo and the writing looks something like this:

LM3886T
AMC-RC

Should I expect that this chip won't have the same performance as the others ?

Now I wonder if the other 5 chips are originals

BobEllis · 1st August 2005, 08:09 PM

sounds like you have 5 good and one questionable - see http://www.national.com/quality/mark...nventions.html

m@ · 2nd August 2005, 03:22 AM

I'm pretty sure I bought a fake LM3886 here in Bkk. I didn't check the numbers on it, but the leads were thinner than the ones National sent me and it didn't work when i put it in a test circuit. I threw it away already or else I'd tell you the numbers.

Cro maniac · 3rd August 2005, 05:21 PM

Bob, thank you for the link !

Today I went to the store where I bought the chips, and when I explained everything to them they gave me a box full of LM's to choose from. So, everything turned out OK.

Cheers !

BobEllis · 3rd August 2005, 08:08 PM

glad it helped and the store was cooperative.

-_nando-_ · 2nd June 2006, 03:39 AM

Quote:

Originally posted by Cro maniac
Bob, thank you for the link !

Today I went to the store where I bought the chips, and when I explained everything to them they gave me a box full of LM's to choose from. So, everything turned out OK.

Cheers !

This was NICE. Never happened to me, and I've tryed so many times...

mobyd · 4th June 2006, 09:31 PM

I wonder would bother cloning a $3 chip ?
M

Netlist · 4th June 2006, 09:50 PM

You seem not to be the only one:
Picture of a Fake LM3886 (not sure yet, but probabily it is!)

/Hugo

CJ900RR · 5th June 2006, 11:59 AM

I work in the electronic manufactor industri, and i must say that it's a bit surprising sometimes how many chip's it is out there whitch is fake.

We dont have the LM3886 or any other audio chip in our product's, but it is werry common for example, that the Dallas DS1621, must be returned back to our suppliers.

Somehow (and i would guess it's mostly in China) people find it worth the time and cost's to take old ic's, remove the label and then print on something new.

Werry often you can see witch is fake and witch is'nt, but they come in sticks and we does'nt open them until we put them in the machine.

So this is a big problem, both for gigant chips like the 3886, down to small chips like surface mounted DS1621 in a SO8 package...

! · 5th June 2006, 10:07 PM

The funny part would've been if you made an amp with it and found it sounded better... then the whole forum runs out trying to find same fake LM3886.

1st August 2005, 07:32 PM	#1
Cro maniac diyAudio Member Join Date: Feb 2004 Location: Zagreb, Croatia Blog Entries: 2	fake LM3886 ? Today I bought 6 LM3886T chips at my local electronic parts store, but when I came home, I found that one chip differs from the others. First 5 chips have National logo and JM16AK written in first row, and LM3886T in the second. Something like this: JM16AK LM3886T (smiley represents the National logo) The 6th chip has no National logo and the writing looks something like this: LM3886T AMC-RC Should I expect that this chip won't have the same performance as the others ? Now I wonder if the other 5 chips are originals

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1st August 2005, 08:09 PM	#2
BobEllis diyAudio Member Join Date: Sep 2003 Location: Upstate NY	sounds like you have 5 good and one questionable - see http://www.national.com/quality/mark...nventions.html

2nd August 2005, 03:22 AM	#3
m@ diyAudio Member Join Date: Nov 2004 Location: bangkok	I'm pretty sure I bought a fake LM3886 here in Bkk. I didn't check the numbers on it, but the leads were thinner than the ones National sent me and it didn't work when i put it in a test circuit. I threw it away already or else I'd tell you the numbers.

3rd August 2005, 05:21 PM	#4
Cro maniac diyAudio Member Join Date: Feb 2004 Location: Zagreb, Croatia Blog Entries: 2	Bob, thank you for the link ! Today I went to the store where I bought the chips, and when I explained everything to them they gave me a box full of LM's to choose from. So, everything turned out OK. Cheers !

3rd August 2005, 08:08 PM	#5
BobEllis diyAudio Member Join Date: Sep 2003 Location: Upstate NY	glad it helped and the store was cooperative.

4th June 2006, 09:31 PM	#7
mobyd diyAudio Member Join Date: Sep 2004 Location: Auckland	I wonder would bother cloning a $3 chip ? M

4th June 2006, 09:50 PM	#8
Netlist diyAudio Moderator Join Date: Jan 2003	You seem not to be the only one: Picture of a Fake LM3886 (not sure yet, but probabily it is!) /Hugo

5th June 2006, 11:59 AM	#9
CJ900RR diyAudio Member Join Date: Jan 2006	I work in the electronic manufactor industri, and i must say that it's a bit surprising sometimes how many chip's it is out there whitch is fake. We dont have the LM3886 or any other audio chip in our product's, but it is werry common for example, that the Dallas DS1621, must be returned back to our suppliers. Somehow (and i would guess it's mostly in China) people find it worth the time and cost's to take old ic's, remove the label and then print on something new. Werry often you can see witch is fake and witch is'nt, but they come in sticks and we does'nt open them until we put them in the machine. So this is a big problem, both for gigant chips like the 3886, down to small chips like surface mounted DS1621 in a SO8 package...

5th June 2006, 10:07 PM	#10
! diyAudio Member Join Date: Jun 2005 Location: Midwest	The funny part would've been if you made an amp with it and found it sounded better... then the whole forum runs out trying to find same fake LM3886.

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