PCB Fabrication Notes

Dated:2017-08-03      Popularity:1558

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.

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