Electronics > Beginners

ENIG necessary for SMD?

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T3sl4co1l:
Hm, I've always been impressed how little lead-free solder flows over ENIG or OSP.  I've seen PDP done before, that is, paste defined pads.  Wide open copper area, selective paste.  Not often: stuff like D2PAKs, heatsinks and mounting holes (when they decide to put some solder blobs on the pad).

Tim

mvs:

--- Quote from: Psi on December 22, 2019, 11:39:12 pm ---I find the solder flows better onto ENIG than HASL,  but i'm not sure if its just in my head.

--- End quote ---
Usually, fresh HASL is much better then cheap (thin) ENIG on that.

Bob Moore:
I would definitely go for ENIG, especially with surface mount components, some of them are really small and a really flat surface is needed for proper soldering, and yes ENIG is more expensive than other coatings such as HASL, but the issue with HASL is that the surface is very uneven.

OSP and  ISN are also an option you can consider for SMT components, I saw an interesting comparison table here https://titoma.com/blog/pcb-surface-finish-enig-hasl-osp-isn-iag it might be helpful

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