Hi Wendi, I would say yes it applies to component marking (reference designators).  Examples in 600 mostly reflect numbering (like traceability) but one example photo shows a component symbol.  As to legibility; I would prescribe to if you can interpret the letters or symbol with 2X it is fine.  However, this section probably could stand some more work.  One thing we have noticed is 6012 does not specifically address adhesion for marking like solder mask is covered in 600 and 6012.  It references a permanency requirement so one would assume tape test and/or solvent resistance would be applicable.  But a tape test may be too difficult to pass for some really small feature sizes/designator letters.  

Guess just another thing to add to the committee to do list. 

C. D. (Don) Dupriest
Lockheed Martin - MFC
Advanced Manufacturing Technology
member of:
Production Technical Excellence Staff
Ph. 972/603-7724 fax: 972/603-9052
Email: [log in to unmask]



-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Wendi Boger
Sent: Wednesday, June 16, 2010 1:05 PM
To: [log in to unmask]
Subject: [IPC-600-6012] Legibility of Marking

Everyone,

 

    Does section 2.8 Marking in IPC-A-600 apply to Legend (component
mark)?    We are increasingly seeing designs with very small legend
features causing discussions at final inspection as to whether they meet
the requirement for legibility.  From what I understand legible means at
no more than 2x you can understand what the symbols are.  Fussiness and
filled in holes in letters are allowed if you can tell what the letter
is. 

 

    Would appreciate some guidance on this.

 

Thanks,

Wendi

 


 
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