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Hi,
Can anyone help me how to select the Via hole size.right now we are using 40mil pad with 23mil drill.
in IPC2221A it was mentioned to take 0.3mm drill hole to vias for reducing the inductance at highfrequencies.If any one explain me what are the things that will effect by changing the via...
Hi all,
Iam using TQFP packages in my design.The problem is Tracks are cutting underneeth the 100pin tqfp IC while the board is in running condition.how is it possible?what could be the reason? all the temperature reading at that IC are under control.pls see the attachment for the images.I have...
yes, its a manufacturing problem.we have intimated to fabricators.The thing started by comparing the PC boards with our PCBS.If you observe in the below link the vias are fully covered with soldermask, and there are no dust particles in the soldermask.In India if there are any fabricator who can...
If i place a white legend in place of via..i may not be able to use that as a test point.why in PCB fabrication the via is not covering with solder mask, what could be the exact reason?
---------- Post added at 08:13 ---------- Previous post was at 07:57 ----------
Ia'm giving 23.62mil(0.6mm)...
Please check the 2770-1.bmp, in the vias are in copper shade, actually vias need to cover with soldermask ink like in 1-4.jpg, but to all pcbs the masking of vias are not coming perfectly.How are your pcbs?could pls show me your pcbs photo(to check whether the vias are fully masked or not?)
Thanks for you reply
1. I don't think, that it must be a problem. Did you check, if the vias are actually exposing the copper, e.g. with a continuity tester. Can you solder the vias?
means, the colour is like that, when i was checking with meter its not showing the continuity,
2.what's your...
hi all,
I have a problem with vias opening on my PCBs(Double side only), though i have not opened them in solder mask layer they are opening with reddish copper shade on pcbs.while i asked the same with fabricator he is saying the masking ink is going in the hole when is was placed in hot air...
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