Annular ring changes and/or mismatches

[silbe]

Fab

JLCPCB

Source URL

https://jlcpcb.com/capabilities/pcb-capabilities

Affected rule

JLCPCB: PTH Annular Ring, JLCPCB: NPTH Annular Ring

Old value

0.075mm, 0.25mm (in rule file, not on source page)

New value

0.18 mm/0.15mm, 0.45mm

Quote from the source

PTH annular ring:

2-layer:
1 oz: Recommended 0.25 mm or above; absolute minimum 0.18 mm
2 oz: 0.254 mm or above

Multilayer:
1 oz: Recommended 0.20 mm or above; absolute minimum 0.15 mm
2 oz: 0.254 mm or above

NPTH pad annular ring:

Recommended 0.45 mm or more. This is to allow a 0.2 mm ring of copper to be removed around the hole for the sealing film to attach. Pad sizes smaller than the recommended value can result in the annular ring being very thin or completely missing.

The pictures show that in both cases the limits apply to the width of the annular ring, not a diameter.

The oldest snapshot of the page on archive.org (from 2022-07-02) already shows a minimum PTH annular ring width of 0.13mm (again the picture clearly shows they mean the annular ring width, not a diameter) so I'm guessing that at least the PTH annular ring rule mistakenly assumed that the difference in diameters is meant and divided the number by two.

Thanks for maintaining this rule file! 💙

[silbe]

I've done a whole bunch of other rule updates and a couple additions to match the current JLCPCB capabilities page (12 commits in total, one per semantic change). How would you like to handle this? Should I open a ticket for each rule?

[Cimos]

Hi @silbe

Thanks for pushing updates to JLCPCB.

I am happy for you to PR it all in one go. I'll look at them all over the coming days.

[silbe]

Much appreciated, thanks! I'll send out a draft PR right away.