Probably. Our PCB fabber suggested that wording. None of those guys can spell.
That's commonly done. I've had copper text added in the middle of a high voltage isolation region, a nice clear target for graffiti, when my fab notes said to not do that.
Topside silk is best so the cert labs can see it in plain sight.
--
John Larkin Highland Technology, Inc
jlarkin at highlandtechnology dot com
http://www.highlandtechnology.com
Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom laser drivers and controllers
Photonics and fiberoptic TTL data links
VME thermocouple, LVDT, synchro acquisition and simulation
Maybe you can help me. Why would this notice need to be printed in any manner on the PCB itself? I can see adding it to the fab drawing, but why on the PCB? It doesn't say it is required to be printed on the PCB, is that part of the spec?
I don't even like that the fab house I use puts ink stamps on the boards. If I wanted some marking to be on the board I would bloody well put it there.
My customer, a big company starting with "A", is taking the whole system through all the CE/UL etc certifications. They want to see the bare-board manufacturer name and UL classification on every board, as a "permanent marking".
--
John Larkin Highland Technology, Inc
jlarkin at highlandtechnology dot com
http://www.highlandtechnology.com
Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom laser drivers and controllers
Photonics and fiberoptic TTL data links
VME thermocouple, LVDT, synchro acquisition and simulation
I get that, but do the details of the spec need to be included? Don't you normally just include the logo or something similar? It even says that you need to include the UL recognized maker's logo and type code. It doesn't say anything about including details of the spec...
I'm trying to get this thing through a test lab to get UL and CE certifications. I'm not enjoying this. They require the PCB fab house to be UL registered, and they want to see their company logo and the UL type classification on the board in permanent marking.
I don't know what you mean by "including details of the spec." What we need to do is add this paragraph to our PCB fab drawing, so that the board house marks the required stuff on every board.
I posted it because I thought it might be helpful.
--
John Larkin Highland Technology, Inc
jlarkin at highlandtechnology dot com
http://www.highlandtechnology.com
Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom laser drivers and controllers
Photonics and fiberoptic TTL data links
VME thermocouple, LVDT, synchro acquisition and simulation
My understanding of how they do this (and I am NOT a lawyer) is the board needs to have the maker's ID or logo, the symbol of the recognized testing lab (can be UL or other) and the board maker's registration number at that testing lab, and the certification the board meets. So, that could look like "Boards-R-Us 94V0 UL 12345" printed in the silkscreen layer of the board.
Ok, I get it. I had the impression you intended to include the text of the image in your PCB layout. Your first post said, "PCBs need to have something like this". You meant "PCB *drawings* need...".
Why would it be hard to get them to include their logo, etc. If they are UL certified I would expect they would be quite familiar with this. Do you discuss the board when you submit it for a quote? I always try to have a discussion if there are any sticky points.
MATERIAL 0.062 THICK, EPOXY GLASS FR-4, 1OZ. COPPER CLAD BOTH SIDES BEFORE PLATING.
FRONT TO BACK REGISTRATION TO BE WITHIN 0.0025".
HOLES NOT DIMENSIONALLY LOCATED SHALL BE WITHIN 0.005" OF THE POSITION AS LOCATED ON THE MASTER DRAWING.
UNLESS OTHERWISE SPECIFIED ALL HOLES SHALL BE PLATED-THRU HOLE DIAMETER TOLERANCES APPLY AFTER PLATING.
ELECTROPLATED COPPER SHALL BE USED FOR THE PLATED-THRU HOLES, AND SHALL HAVE A MIN. THICKNESS OF 0.001" ON THE HOLE WALLS.
ALL EXPOSED CONDUCTIVE SURFACES ON LAYERS 1 AND 4 INCLUDING PLATED-THRU HOLES, SHALL HAVE AN ELECTROPLATED SOLDER COAT WITH A MIN. THICKNESS OF 0.0003". THE SOLDER COAT SHALL CONTAIN A MIN. OF 60% TIN.
WHERE APPLICABLE, EDGE FINGERS ARE TO BE GOLD PLATED .00005" MIN. OVER NICKEL .00020" MIN. (TO DIMENSION SHOWN)
BOARDS SHALL BE SOLDER MASKED ON LAYER 1 AND 4 OVER BARE COPPER CONDUCTORS. THE SOLDER MASK SHALL BE GREEN SOLDER RESIST LIQUID PHOTO-IMAGEABLE, MATTE FINISH.
SOLDER MASK SHALL BE APPLIED PRIOR TO SCREENING.
SCREEN ALL LEGENDS IN WORNOW INK 50-100, GLOSS WHITE.
BOARD MUST BE ETCHED IN COPPER ON SOLDER SIDE WITH MANUFACTURER NAME, INITIALS OR LOGO, UL RECOGNITION MARK AND FLAME RATING IN LOCATION SHOWN.
Specifying a location for the board house's UL recognized mark on a nonconductive gerber layer, along with the usual comment re 'add no conductive patterns' is usually sufficient.
If you are going to have UL rather than ETL, CSA or some other NRTL do the listing, realize that UL sometimes does not always follow their own documentation and could possibly have you do things that are not required in the UL specification you are trying to get listed to.
Nice fab notes. We've gone to all gold-over-nickel on the pads, so we can build ROHS or not.
I'd allow silk or copper for #11. Our main board house uses silk for his id and date code.
We like yellow on blue, but that's just us. We recently did one board with black solder mask, to keep some things dark.
--
John Larkin Highland Technology, Inc
jlarkin at highlandtechnology dot com
http://www.highlandtechnology.com
Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom laser drivers and controllers
Photonics and fiberoptic TTL data links
VME thermocouple, LVDT, synchro acquisition and simulation
You actually have to check the PCB company UL listing. Easy to do. Ask the company for their UL file number and then look it up at ul.com.
Sometimes these require a logo, sometimes the company name, sometimes the UL file number. Markings can vary for one company depending on whether the board is double layer or multi layer.
PCB companies often have to be reminded of their UL file requirements. We have a chewck of UL markings as part of incoming goods inspection.
A problem we have had is with date coding. Sometimes we have had wwyy and other times yyww from the same company. Having had boards marked 0709 we have had trouble pinning down actual date for UL inspection. We now specify how the date code should be done.
Marking: Company name or trademark or file number and type designation. May be followed by a suffix to denote factory identification or burning test classification.
The inspectors that come to the factory on their unannounced inspections look for the UL logo on the board. For small components subject to UL approval they check that the component being used is the one on the board or in the product, but for a PCB they would have no way of knowing if the actual board material is recognized or not.
I recall getting a panicked call from Comp USA when I worked for a motherboard company that supplied motherboards for Comp USA's line of computers (Compudyne) that they were building in each store. Each store was a UL approved factory. Someone in Taiwan had substituted a non-UL lithium battery on the board. The inspector caught it right away since batteries are a big deal to UL. The person in Taiwan was trying to save money, unaware of the reasons why we had specified a certain part.
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