Electronics Forum: ipc-sm-840 (Page 1 of 2)

Solder mark thickness on PCB

Electronics Forum | Tue Jan 09 08:36:17 EST 2018 | pavel_murtishev

IPC-SM-840. If overall thickness is not specified in purchasing documents, a supplier will do whatever it wants. Specify your requirements. Typical values are 20-50um. Regards

Solder mark thickness on PCB

Electronics Forum | Thu Jan 11 04:23:08 EST 2018 | jaisabaigroup

IPC-SM-840. > > If overall thickness is not > specified in purchasing documents, a supplier > will do whatever it wants. > > Specify your > requirements. Typical values are > 20-50um. > > Regards Thank you very much, Pavel.

PCB Burned after reflow?

Electronics Forum | Thu Mar 05 09:46:12 EST 2009 | davef

Solder mask requirements: * IPC-6012 and IPC-SM-840 contain detailed specifications and information regarding solder mask requirements. * IPC-A-600 defines acceptability of printed boards [analog of A-610 for board assemblies]. Why can't you use A-6

Re: Solder Mask IPC Standard

Electronics Forum | Fri Oct 08 18:26:19 EDT 1999 | Dave F

Is there an IPC Standard stating the max. number of times that a PCB can pass through a reflow or wavesolder machine without having solder mask breakdown. PCB is FR4 Solder Mask is LPI Reflow and W/S Profile = Standard t

Re: Solder Mask IPC Standard

Electronics Forum | Fri Oct 08 13:04:15 EDT 1999 | Dave F

Is there an IPC Standard stating the max. number of times that a PCB can pass through a reflow or wavesolder machine without having solder mask breakdown. PCB is FR4 Solder Mask is LPI Reflow and W/S Profile = Standard thanks and rega

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

SMT Processing and gasketing

Electronics Forum | Tue Nov 11 16:30:08 EST 2008 | naynayno

Occasionally solder mask thickness is believed to be the cause of gasketing challenges during paste printing. We currently specific IPC-SM-840 on our fab drawings but this provides no limits or guidelines on thickness. I do not want to cause an unr

Plugging of via through holes

Electronics Forum | Wed Jul 23 08:18:29 EDT 2008 | davef

Q1. Is this a standard process for plugging? A1. Not as such. We checked both IPC-6012 and IPC-SM-840. Neither comments on plugging. So, your fabrication notes rule the day. Q2. Is this okay for such thick PCB's or is it mandatory to use a special pl

Conformal Coat peeling

Electronics Forum | Fri Apr 10 07:52:16 EDT 2009 | davef

On cure checking, we have this undated note from Jack Crawford at IPC * IPC-SM-840C "Qualification and Performance of Permanent Solder Mask" has several Test Methods for different types of solder resist material, but probably the only applicable one

Re: Solder Mask IPC Standard

Electronics Forum | Sun Oct 10 17:40:50 EDT 1999 | JohnW

Is there an IPC Standard stating the max. number of times that a PCB can pass through a reflow or wavesolder machine without having solder mask breakdown. PCB is FR4 Solder Mask is LPI Reflow and W/S Profile = Standard

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