PCB Fabrication Notes
When placing a PCB order, it is extremely important to provide all of your PCB requirements clearly and completely to your manufacturer. It may seem easy and obvious; however, sometimes customers may omit some of them when they request a quotation for their PCB boards. To avoid unnecessary delay, in this article, we list some basic data you need to offer to your manufacturer.
1. Add manufacturer marking (logo/ UL/ data code) bottom side, where shown. Use permanent white ink.
2. All diameters in inches.
3. Apply ENIG to exposed pads, 1L and L4, after soldermask. Thickness 2 micro-inches over 118 micro-inches.
4. Diameters for hole are finished sizes.
5. Fabricate and inspect to IPC Class 3 standard. PCB is for medical application. In case of conflict, the requirements of this drawing, or the purchase order, supercede IPC spec.
6. If pad is larger than non-plated hole, do not remove pad, and do not remove any copper from pad – secondary drill required.
7. Layer 1 is top copper layer. Layer sequence is: top/ gnd/ pwr/ bot.
8. Linear tolerances: 3-place decimal, +/-.005; 2-place decimal, +/-.010
9. Minimum copper in plated holes per IPC6012, current revision, Class 3.
10. No X-outs are allowed on panel.
11. Process: apply glossy green LPI soldermask over bare copper, 1L and L4.
12. Score angle 30 degrees. Remaining material thickness: .012 +/-.004. Scoring extends entire distance across panel.
13. Silkscreen component location markings, white permanent, non-conductive ink, L1 only, per supplied Gerber file.
14. .032 maximum radius on inside corners of cutout.
15. 100% electrical test required for shorts and opens. Stamp all good PCBs where shown with non-conductive ink.