Different codes on LM3886TF chips

richard.C. · 5th August 2011, 02:09 AM

Hi all,
just having a close look at some spare 6x LM3886 chips i bought on ebay. They are have a different code printed on them, marked PM94AN, PM94AG, PM94AK. The ones i have already are marked JM09BHE3. Whats the deal here, can anyone tell from the codes if they are inferior production lines?

rick

sofaspud · 5th August 2011, 02:21 AM

Not to worry. Those are probably just manufacturers' codes for date, batch, location, etc. A company's internal part number, in a sense.

Michael Bean · 5th August 2011, 02:28 AM

You might be able to figure it out here:Device Marking Conventions | National Semiconductor

Mike

AndrewT · 5th August 2011, 09:31 AM

The observation that they are all different confirms that they are genuine or from four completely independent fakers.

! · 7th August 2011, 06:10 AM

^ or the fakers now have internet access so they can read about how their fakes are identified and make the necessary changes. Granted most of them wouldn't, but of all things to change the stamp on it would be one of the easiest and cheapest.

richard.C. · 7th August 2011, 09:14 AM

Quote:

Originally Posted by AndrewT

The observation that they are all different confirms that they are genuine or from four completely independent fakers.

So they're genuine fakes?

5th August 2011, 02:09 AM	#1
richard.C. diyAudio Member Join Date: Jan 2006 Location: Sydney	Different codes on LM3886TF chips Hi all, just having a close look at some spare 6x LM3886 chips i bought on ebay. They are have a different code printed on them, marked PM94AN, PM94AG, PM94AK. The ones i have already are marked JM09BHE3. Whats the deal here, can anyone tell from the codes if they are inferior production lines? rick

5th August 2011, 02:21 AM	#2
sofaspud diyAudio Member Join Date: Nov 2005 Location: San Antonio TX	Not to worry. Those are probably just manufacturers' codes for date, batch, location, etc. A company's internal part number, in a sense. __________________ It is error only, and not truth, that shrinks from enquiry. - Thomas Paine

5th August 2011, 09:31 AM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	The observation that they are all different confirms that they are genuine or from four completely independent fakers. __________________ regards Andrew T.

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5th August 2011, 02:28 AM	#3
Michael Bean diyAudio Member Join Date: Sep 2004 Location: Minneapolis, Minnesota, USA	You might be able to figure it out here:Device Marking Conventions \| National Semiconductor Mike

7th August 2011, 06:10 AM	#5
! diyAudio Member Join Date: Jun 2005 Location: Midwest	^ or the fakers now have internet access so they can read about how their fakes are identified and make the necessary changes. Granted most of them wouldn't, but of all things to change the stamp on it would be one of the easiest and cheapest.

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