Electronics Forum | Thu Jan 03 08:44:08 EST 2002 | davef
The Tg of the resin commonly used in FR-4 is 140�C. Consider checking with your supplier to better understand the specific materials used in constructing your board.
Electronics Forum | Thu Jan 03 15:20:02 EST 2002 | Luis F. Otero
What method of depanelization is used to depanelize circuit boards made of flexable ribbon cable material.Any input welcomed. Luis F. Otero (915)-780-5504
Electronics Forum | Wed Jan 16 13:09:41 EST 2002 | jhingtgen
Yannick, I have been involved in a stencil consortium that looked at stencil design, technology, and paste as variables. This material will be presented at APEX 2002 in San Diego next week. This work was done by Rochester Institute of Technology i
Electronics Forum | Sat Mar 30 17:42:33 EST 2002 | davef
Never read anything like that, but with the same courtyard, you have the ability to position less material with a circle than a square. Search the fine SMTnet Archives for a heirarchy of sources from which to select pad dimensions
Electronics Forum | Mon Apr 01 20:33:30 EST 2002 | davef
Regarding your underfil ... * What material did you use as an underfil? * What machine and technique did you use to apply the underfil? * What type of component were you underfilling? * What was the end-use environment?
Electronics Forum | Mon Apr 01 12:07:25 EST 2002 | slthomas
* What material are you using? Loctite 3609 * What is your cure profile? In excess of the 90-120 seconds at 150C that Loctite recommends. * Dot dimensions and tip? 27g. conical tipped needle for the 0603's. I started with a 14 mil dot which loo
Electronics Forum | Wed Apr 10 22:32:44 EDT 2002 | davef
This is free material. The total cost of the reel, er whatever, was included in the completed production run. Obvious choices are: * Throw it in the dumpster * Return it in stock at zero inventory cost and save it 'til the next time you run that pr
Electronics Forum | Fri Apr 12 13:33:17 EDT 2002 | blnorman
We use steel stencils. The adhesive manufacturer can give recommendations for squeegee type, material, pressure, etc. A lot of the tech data sheets include this information.
Electronics Forum | Thu Apr 18 16:55:39 EDT 2002 | davef
Yes. Ceramic is much better. We use FR4 in fairly high voltage circuits. What are the particulars? * Where are you arcing * How many layers, prepreg, etc
Electronics Forum | Fri Apr 19 15:52:31 EDT 2002 | davef
So, what is 'high voltage'? anywho? * We sort of use 10 kV as the starting point for 'high voltage'. * National Electrical Code defines a much lower starting point (300 or 600 V?),
