Electronics Forum | Thu Oct 22 03:24:39 EDT 2009 | shinseimy
Base on my PCB experience, the contamination issue might caused by PCB finishing or SMT process (like oven or printing). Before go further, maybe you can check few things. How many PCB affected per lot?? it might be caused by humidity (storage or pac
Electronics Forum | Fri Sep 04 15:33:09 EDT 2009 | martinphill
Is it possible to Process Top & Bottom side PCBA simultaneously in One SMT Line. (An atrticle by Jagadeesh Rajagopalan, SMT Process consultant). Pls check this and suggest me whether it is possible? & What should be the Lead free Reflow Profile? ht
Electronics Forum | Fri Sep 18 04:19:33 EDT 2009 | gregoryyork
Glycerine on a PCB is very bad news as it is Hygroscopic and can attract moisture to the Circuit. Alot of this used to be used in HASL Fluxes and is a no go for Circuits that are not going to be washed. They too could dissolve the natural Halides fro
Electronics Forum | Sun Sep 13 19:56:21 EDT 2009 | 89jeong
Hi All I have a pig problem after reflow. It is a blister in hole.It happend after reflow(Lead free solder) I touched the blister with tweezer. The plating was lifted off easily How do i do? What is a root casue? Drilling or plating? Is it possible
Electronics Forum | Sat Sep 19 16:15:27 EDT 2009 | sskeels
I am looking for a forum to ask for leads (other forums or manufacturers) who might provide what are called IC Adapters or Carriers which allow the use of an IC with a changed footprint (land pattern or pin-out) to be used on a previous PCB which has
Electronics Forum | Thu Sep 24 09:00:30 EDT 2009 | stepheniii
Those articles are talking about screening before PTH placement. They are talking about pin in paste. He would still have to stencil the glue before the PTH parts. How would the squeege go over the clinched leads? And if he does get a new line I wo
Electronics Forum | Sun Sep 27 22:39:55 EDT 2009 | rajeshwara
The same issue i faced 2 yrs before , i sugest 1. Use stencil of 4 mils ( Take care of Aspect Ratio and Area Ratio ). 2. Use Solder Paste of Type 4.5 and Viscosity in between 1100 to 1300. ( Try Solder Paste of Cookson or Alpha metals : OM338 T45-L
Electronics Forum | Fri Oct 02 14:52:24 EDT 2009 | davef
If you know "soldering Pb free (Sac based soler) to Pb/Sn coated lands is a no-no," why would soldering with Pb/Sn to Pb-free coated lands be different? If you are going to do this, follow the advice of an earlier poster who recommended higher peak s
Electronics Forum | Fri Oct 30 09:19:46 EDT 2009 | cab
We have performed some EDS analysis and found high percent (approx 18% ) of Ni on surface of gold pad. Found Tungsten as well. This is an HTCC alumina package. Thickness of gold was confirmed and found to be in spec. We believe we are dealing wi
Electronics Forum | Mon Oct 26 15:38:27 EDT 2009 | davef
We believe that some suppliers replace nickel with cobalt in SN100 to product a shinier, less grainy, more attractive lead-free solder connection. SN100E sales-types like the idea that it is available in paste, bar stock, and other forms; as compare