Electronics Forum | Mon Apr 05 16:12:16 EDT 2010 | dyoungquist
We are installing via reflow soldering a crystal that has 2 pads, 1 each end. They are flat pads on the bottom of the part with a small area of the pad looping around and up the side of the crystal on the end. Inspection of the cyrstal under a 40X
Electronics Forum | Thu Jun 21 12:05:54 EDT 2001 | brownsj
I used to assembly 0402 devices on to a double sided PCBA using a 96% tin 4% silver alloy. This material printed fine but the higher processing temperatures did present a problem. This material had a melting point of 221 deg C which required a peak r
Electronics Forum | Tue Jan 13 15:48:58 EST 2015 | natashakt
170 degrees Celsius) and regular FR4 materials. I am trying to see if we can use table 5 on page 14, "Recommended Equivalent Total Floor Life (Days)" to find out how long (at specific humidity and temperature) our populated and unpopulated PCB's can
Electronics Forum | Fri Jan 08 01:24:34 EST 2016 | sunnyduan
What's the best company for low volume, quick > turn around PCB assembly? > > Why do you choose > their service over others? What's the cost > ballpark for 10 3"x3" boards assembled? > What's the best company for low volume, quick > turn arou
Electronics Forum | Wed Jun 24 18:50:31 EDT 2020 | premkumar_haribabu
Dear experts, We are in stage to fix lapse or hold time between pre-bake to reflow process ( SMT ) for flex-rigid PCB, usually for flex pcb , we need to assemble as early as possible once after baking & if not , we can store in humidifier up to some
Electronics Forum | Mon Jan 27 12:02:00 EST 2003 | Mike Konrad
Dave is correct. No-clean flux + water = white residue (unless the proper chemical is mixed with the water). Additionally, no-clean flux + IPA = white residue. Many saponifiers work well as do other cleaning agents. White residue may also be a re
Electronics Forum | Mon Aug 13 12:38:38 EDT 2012 | grahamcooper22
Maybe the area ratio between the sides of the stencil apertures and the aperture opening is too low for the spec of the paste ? So it will tend to stick in the apertures. ...only solution is thinner stencil or a paste that can release easily when are
Electronics Forum | Fri Feb 21 10:00:38 EST 2003 | ghenning
I would appreciate any feedback that can be provided regarding best practices and common practices for control of incoming PCB blank quality. How common is sectioning and other sorts of analysis? Do these efforts result in real improvements in vendo
Electronics Forum | Tue Dec 19 21:23:39 EST 2006 | davef
We'd suggest using your connector supplier recommendations. Some use: * Pad Plating: 20-30 uin Au over 50 uin Ni (You might get away with less gold) * In-Pad Vias: less than half the diameter of the button (for contact-only configurations) * PCB/C
Electronics Forum | Mon Feb 02 16:45:05 EST 2009 | alexander_jw
Looking for a clear conformal coating that can protect a PCB outdoors in Southern CA. Board is 24" x .25" x .03125. Require product to withstand some flexing during installation because of its very thin profile. Must hold up to environment for 10yrs+
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