Numbering of National chips

Floric · 17th August 2005, 09:48 PM

Hello,

this might be a stupid question, but I searched the web and did not find an answer...

I have two LM3886 chips from different sources here, one is numbered "JM44AB LM3886TF" and the other "JM44AF LM3886TF". What does the "B" and the "F" mean? Are there any differences between the chips?

Thanks

Flo

funberry · 17th August 2005, 11:11 PM

The manufacturer needs to communicate other info on the package markings, besides the part number.
The other markings you see are alphanumeric codes representing the week/year of manufacture, which plant made the part, and, in the case of the LM3886, whether it has straight or staggered pins.
You can safely ignore those numbers.

Adrian

Floric · 18th August 2005, 06:31 AM

Thank you Adrian,

I thought of anything like this but I was not shure.

Have a nice day

Leolabs · 18th August 2005, 03:13 PM

-First code stands for wafer fab plant:J stands for Greenock,UK
-Second code stands for assembly plant:M stands for Malacca,Malaysia
-Third and fourth numbers stand for date of manufacturing,which i still havent figure out how to read them.

-Fifth and sixth are die run(wafer lot) codes.

Hope this help

17th August 2005, 09:48 PM	#1
Floric diyAudio Member Join Date: Jan 2005 Location: Bavaria	Numbering of National chips Hello, this might be a stupid question, but I searched the web and did not find an answer... I have two LM3886 chips from different sources here, one is numbered "JM44AB LM3886TF" and the other "JM44AF LM3886TF". What does the "B" and the "F" mean? Are there any differences between the chips? Thanks Flo

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17th August 2005, 11:11 PM	#2
funberry diyAudio Member Join Date: Aug 2005	The manufacturer needs to communicate other info on the package markings, besides the part number. The other markings you see are alphanumeric codes representing the week/year of manufacture, which plant made the part, and, in the case of the LM3886, whether it has straight or staggered pins. You can safely ignore those numbers. Adrian

18th August 2005, 06:31 AM	#3
Floric diyAudio Member Join Date: Jan 2005 Location: Bavaria	Thank you Adrian, I thought of anything like this but I was not shure. Have a nice day

18th August 2005, 03:13 PM	#4
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	-First code stands for wafer fab plant:J stands for Greenock,UK -Second code stands for assembly plant:M stands for Malacca,Malaysia -Third and fourth numbers stand for date of manufacturing,which i still havent figure out how to read them. -Fifth and sixth are die run(wafer lot) codes. Hope this help