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-   -   Is this a fake LM4562NA? (https://www.diyaudio.com/forums/parts/266368-fake-lm4562na.html)

kroto 15th December 2014 11:40 AM

Is this a fake LM4562NA?
 
1 Attachment(s)
Please take a look to the attachment.
I got this for about 2.5 US$/pcs from local supplier.
The strange thing is, if LM4562 has 10mA Quiescent current, why my NE5532(Iq=4.5mA) is more hot(warmer) than LM4562?
Is it new TI batch marking now have 8 digit? JR12AEE3 ??
Is the leg seems genuine?

The other strange thing if it fake is, why it sound more detail than my NE5532..
I'm sooo confused! :scratch1:

Mooly 15th December 2014 11:59 AM

It looks dubious to me. The lettering isn't perfect for one thing, some appear to be at an angle and some out of line. The 5532 has a higher Iq than 4.5ma. 10 to 12 ma would be typical for the total combined current of the two amps in one package. A 4562 and 5532 probably run at around the same temperature from what I remember of them.

kroto 15th December 2014 12:35 PM

Hi Mooly,

you see the right IC have a words on it: K O R E A 12 (and X in the midle)
the left IC have : K O R E A 13 (and X in the midle)
why are there have different bottom body mark/stamp for the same batch JR12AEE3 ?

but, I don't quite care anymore, they sound pretty good!
my ears don't eat number, they eat good music.. :p

regards!

Mooly 15th December 2014 02:03 PM

2 Attachment(s)
I got curious and so took some close ups of the 4562's I have and tbh the same things I criticise in yours are apparent in mine too.

They are physically a little different but in fairness having seen mine I wouldn't like to say.

kroto 15th December 2014 03:46 PM

according to TI batch numbering, my batch number JR..., the wafer fab plant should be made in Greenock, UK. and the Assembly Plant sub-con should be in Malaysia. but the bottom stamped Korea.
yours is 2B... that should be Taiwan & Thailand respectively.

I'm in total confuse!!
need to take a naap.....

kroto 12th July 2015 03:58 PM

Yo Mooly, I think mine was fake.
I just check the Iq, its only draw about 4uA (total)...
:mad: :(

Michael Bean 12th July 2015 04:31 PM

Quote:

Originally Posted by kroto (https://www.diyaudio.com/forums/parts/266368-fake-lm4562na-post4387738.html#post4387738)
Yo Mooly, I think mine was fake.
I just check the Iq, its only draw about 4uA (total)...
:mad: :(

I agree, they're fake. I just went and looked at my batch of 4562's and the look exactly like Mooly's with a different date code.

Mike

Alan0354 12th July 2015 04:34 PM

2 Attachment(s)
This is the ones I bought in Digikey, hopefully it's real!!! I bought it like 4 months ago.

Guys, you have better eyes than me. The only difference is the Korea at the back.

BTW, just to double check, when OP measure 4uA supply current, are both opamps have NFB and biased to the right voltage like in a real circuit? Because if the IC is just plugged in with all the I/O pins open, I can see there can be possibility of having low supply current. This is because without proper bias, the CCS inside saturate and totally stop functioning and not drawing current.

Just a thought.

Michael Bean 12th July 2015 04:41 PM

Quote:

Originally Posted by Alan0354 (https://www.diyaudio.com/forums/parts/266368-fake-lm4562na-post4387776.html#post4387776)
This is the ones I bought in Digikey, hopefully it's real!!!

Look just like mine, and for what it's worth, I've been doing business with Digi-Key ever since their start-up, have spent literally thousands of dollars there and I've never had a problem.

Mike

Alan0354 12th July 2015 04:44 PM

Quote:

Originally Posted by Michael Bean (https://www.diyaudio.com/forums/parts/266368-fake-lm4562na-post4387784.html#post4387784)
Look just like mine, and for what it's worth, I've been doing business with Digi-Key ever since their start-up, have spent literally thousands of dollars there and I've never had a problem.

Mike

I never realize there are so many fakes until now!!!

I do stick to big companies like Digikey, Allied, Newark and Mouser for semi conductors and even capacitors. I only go cheap with resistors.

Particular IC and transistor is not easy to test all the parameters.


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