Electronics Forum | Mon Dec 09 20:50:08 EST 2002 | MA/NY DDave
Hi I kind of agree without any reliability studies. Where are the Ionics coming from? After Soldering depending on chemistry I think we agree? Yet these are bare boards after many processes and even testing that should scrub out or off the Ionics.
Electronics Forum | Tue Dec 10 18:30:15 EST 2002 | MikeF
From personal experience, if the PWB vendor is cutting costs and doing their final rinse with tap water instead of DI you will get ionic contaminants left on the board. You might consider having CSL, or one of the other independent labs mentioned e
Electronics Forum | Thu Dec 12 13:53:01 EST 2002 | gregoryyork
Considering only Ionic residues is very dangerous, most heat transfer fluids that are extremely hygroscopic are also non ionic especially those used in HASL / Roller Tinning fluids. Also consider if the resist is cured or in fact porous which absorbs
Electronics Forum | Tue May 18 22:31:05 EDT 2004 | davef
Ionic cleanliness is pretty much meaningless, when discussing nc flux residues. If you do the good solder routine and measure the boards, you'll be in the out-house, because the water in your resistivity of solvent extract tester will turn the res o
Electronics Forum | Wed Dec 18 11:32:22 EST 2002 | johnw
The other thing to look at is the component spec, most will state a max, e..g SMT ceramic Caps are actually rated to be hand soldered at 500F!... fine if it's a light PCB but if it's a big thing with lot's of grounding.... Teh component suppliers re
Electronics Forum | Fri Jan 10 14:11:27 EST 2003 | genny
It's always safer to use a higher voltage cap than a lower voltage cap. It isn't a fuse... There is only one case where we dropped the voltage on a cap. We were using a tantalum cap that was rated to 16V, but had been built in the standard packagi
Electronics Forum | Thu Feb 13 08:28:47 EST 2003 | pjc
Call 1-800-737-8110 for tech support. They can give you the N2 supply specs for the 650C. You should consider the cost to convert the Contour to a standard Lambda vs. the cost to bring in N2 and the consumable costs. Tech Support can give you the ret
Electronics Forum | Fri Feb 28 09:08:03 EST 2003 | davef
Without drilling through the numbers, they're probably correct. Recognize that standard warp / twist specs [IPC-A-610 1.5% for PTH only and 0.75% for SMT] are not going to make it on tech boards. You need to define specific requirements. This warp
Electronics Forum | Sun Mar 23 00:09:02 EST 2003 | MA/NY DDave
Know the specs your assembly is supposed to meet 2>Runs some lot soldering samples to minimize cost if you do decide to scrap or bake or ?? 3>Do at least a little post soldering analysis to assure yourself that the results are similar to experien
Electronics Forum | Thu May 22 00:21:27 EDT 2003 | AlCapone
The alternative is by looking at all your components data specs (heat-range), especially pay more attentions to heat-sensitive comps, and fine-pitch comps, odd-form comps, draw a diagram on a separate sheet of paper shown that temperature VS those ca