I have seen wide varieties at previous companies, from too few to too many with boilerplate, old revisions of standards, etc. Can you suggest a middle of the road list? This is for regular PCB fabrication for production.
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asked Dec 8, 2010 at 20:37
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3\$\begingroup\$ One thing to keep in mind is that it's tempting to copy-and-paste fab notes from an existing design -- but those requirements may sometimes be contrary to your own interests. Make sure that you agree with the details, especially when they reference a standard. Otherwise, you may be spec'ing yourself to a more expensive board than you need! \$\endgroup\$– ToybuilderCommented Apr 6, 2011 at 18:01
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4 Answers
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Identification:
- client's name,
- (project ID),
- unique PCB ID
PCB metrics:
- material,
- CTI (Comparative Tracking Index),
- thickness,
- color,
- number of layers,
- layer stacking: reference to Gerber filename for each layer,
- copper thickness,
- solder mask color,
- silkscreen color
Panelization
- Tooling for PCB edges: V-cut or milling,
- PCB outline drawing with tolerances. This may be as simple as a rectangle, but this board's outline consists of 52 line segments
Layout
- If there's room for it some shops like to add a quality logo (like UL) and/or a production date to the silkscreen. Tell them which area of the PCB they can use for this.
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1\$\begingroup\$ I has to look this up "The Comparative Tracking Index or CTI is used to measure the electrical breakdown (tracking) properties of an insulating material." from en.wikipedia.org/wiki/Comparative_Tracking_Index \$\endgroup\$ Commented Apr 13, 2012 at 16:01
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Here is one I found (free login required), but I don't know if it's good or complete. I don't see UL-94V, for example. Printed Circuit Board Designer's Reference; Basics gives this example chapter.
answered Dec 8, 2010 at 20:39
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2\$\begingroup\$ +1 for the note about "Thieving". I always get a question from the Fab House about this. \$\endgroup\$ Commented Dec 8, 2010 at 21:10
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1\$\begingroup\$ The first link is dead. They probably moved it here: pcbdesignschool.com/?p=17 \$\endgroup\$ Commented Aug 23, 2011 at 22:43
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- Board Name
- Company/personal name
- Copyright year
- Thickness
- Board material type
- Copper weight
- Panelization instructions
- Tolerances
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To what's already been mentioned, I'd add
- Surface finish (HASL, gold-plated, or ...)
- Lead free requirements or lack thereof
- Serialization requirements
- Allowed deviations from the design files (i.e., remove silkscreen from areas not covered by solder mask, etc.)
- color of solder mask
- Any specifications for controlled impedance (i.e. "tracks drawn as 4.05 mil wide on top layer shall be 50 Ohm controlled impedance +/- 10%")
- Tolerances for board dimensions, drill registration, drill diameter.
- Fire safety rating (e.g. 94V-0), if required.
answered Apr 12, 2012 at 18:07