Electronics Forum: resist (Page 1 of 94)

electrodeposited resist

Electronics Forum | Tue Sep 10 11:10:08 EDT 2002 | Wang

I wonder if anyone has experience with electrodeposited photoresist, namely PEPR 2400. I have had some problems working with it. If I do not use thickness controller PEPR 2400 TC (active component 2-Octanone), film tends to be thick. I fI use it, fil

Scratches on BGA solder resist

Electronics Forum | Tue Feb 27 22:40:28 EST 2007 | davef

IPC-A-600G, 2.9 Solder Resist [Solder Mask] [snip]"Solder resists are used to limit and control the application of solder to selected areas of the printed circuit board during assembly soldering operations and are sometimes used to reduce dendritic f

Scratches on BGA solder resist

Electronics Forum | Tue Feb 27 20:17:19 EST 2007 | roderickray

I have been trying to tell people at work that minor scratches on solder resist on BGA will not effect functionality of BGA, instead they want to attempt repair of these scratches. Any suggestions.

Scratches on BGA solder resist

Electronics Forum | Wed Feb 28 07:40:26 EST 2007 | realchunks

Hi Roderick, Guess it depends on how you define "minor". If it is just a visual blemish in the mask, there will be no affect o the BGA. If it is through the resist there may be a chance of solder shorting, which will affect it, I doubt it but poss

Water soluble solder resist masking

Electronics Forum | Fri Dec 12 10:28:30 EST 1997 | David Syracuse

I am interested in locating a water soluble resist mask that does not leave a residue after wash and is easy to work with during the screen printing process. I have tried the Alpha Metals 110 and 220 solder mask and have found that it does not leave

Clearence of solder resist from QFP Leads

Electronics Forum | Fri Jan 09 08:20:43 EST 2009 | caerleon

Does anyone have design knowledge of why some manufacturers remove solder resist from the area around pads on fine pitch devices? What purpose does it serve? I only know that it would be better for AOI as you would not have light being reflected fro

Clearence of solder resist from QFP Leads

Electronics Forum | Fri Jan 09 09:43:48 EST 2009 | boardhouse

Hi Simon, The main reason that it would probably be removed would be do to lack of clearance for a soldermask dam from pad to pad. typically if the clearance from pad to pad is under .008 the solder mask dam would be removed. Min recomended dam siz

No-Clean Wave Flux - Water Wash

Electronics Forum | Mon Mar 29 11:49:44 EST 2004 | gregoryyork

White residue, probably nothing to do with the flux but was more than likely mineral salts from resist cure problem that are only soluble in Mineral Acids. No residue is the best IF resist is good, if resist issue's use low solids Rosin No Clean and

Resistance value level of lead-free solder joint

Electronics Forum | Mon May 26 08:02:11 EDT 2003 | davef

Resistance: Tables of wire gauge often provide a resistance measure of some kind for each gauge. That way we can estimate the resistance of any length of wire we might be interested in. Calculating trace resistance is only slightly more complicated.

Resistance of traces

Electronics Forum | Tue Sep 14 13:36:11 EDT 1999 | Jeff Armato

I am looking to find a formula to calculate the resistance of circuit traces based on width

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