Electronics Forum: pcb assembly flatness requirements (Page 1 of 39)

SMD flatness standard

Electronics Forum | Sun Nov 19 22:21:37 EST 2006 | KEN

When you say "SMD" I am assuming you are refering to a component. But in your description you mention these are some type of "boards". "flatness" or coplanarity is a function of the application and process. I think in your case your standards wo

SMD flatness standard

Electronics Forum | Fri Nov 17 14:36:17 EST 2006 | Fer

Good afternoon all, There is an issue in my company regarding flatness on SMDs. The part I am fabricating is a multilayer assembly of .175" by .175" by .049" thick. The part is made out of a multilayer copper clad PTFE with a tin finish surface. Af

SMD flatness standard

Electronics Forum | Mon Nov 20 19:49:03 EST 2006 | davef

Sorry for stating this incorrectly. It should been: Bow & twist for bare boards and panels: IPC-A-610 Acceptability of Electronic Assemblies, 10.6: 1.5% for PTH only and 0.75% for SMT, acording to test method TM-650, method 2.4.22 IPC-6012, par. 3.

Floor life pcb assembly

Electronics Forum | Wed Apr 23 17:28:46 EDT 2008 | davef

The need to prebake boards to remove moisture from the board [to prevent voiding] prior to wave soldering is driven by the thickness of through hole plating. * 1 thou [25um] or greater requires no prebaking * LT 1 thou [25um] requires prebaking

compactflash memory process requirements

Electronics Forum | Sun Apr 21 19:56:57 EDT 2002 | francis khoo

Hello Pete, Very true about the heel fillet. Looks like the pad at pcb has to be designed such that the pad should extend at heel but short at toe. About the encapsulation. I can understand the requirements. Can you provide me with a more detail proc

pcb plating

Electronics Forum | Fri Jun 14 14:30:36 EDT 2002 | davef

Assuming you are talking about solderable surfaces: People specify various materials to protect the solderability of the pads on the board. Gold, actually, Electroless Nickel - Immersion Gold [ENIG], is popular. * Board fabricators like it because

pcb manufacturing

Electronics Forum | Fri Apr 03 22:08:48 EDT 2015 | rmartini

My company provides high reliability assembly. http://www.pat-inc.com Let me know if I can assist with your requirements.

PWAs & PWB bake out requirements

Electronics Forum | Thu Aug 09 09:05:09 EDT 2007 | davef

There are no requirements acceptance criteria for baking of board assemblies. What are your customer requirements? The common reasons people choose to bake PCB are to prevent: * Delamination of multilayer boards * Measles, particularly on double si

Help with resources for SMT assembly

Electronics Forum | Sun Jul 26 05:56:28 EDT 2015 | spoiltforchoice

http://www.surfacemountprocess.com/solder-paste-printing-process.html this site has some pretty good general advice for the novice. I am in no way affiliated with it and I have no idea as to its eventual commerical aims (if any). ENIG if your produc

Polyimide PCB card assembly

Electronics Forum | Wed Jun 02 09:21:34 EDT 1999 | Dan Burnikel

Hello all I have a question concerning whether or not there is any special requirements to follow for assembly of a Polyimide PCB card. The customer has the following information on there documentation but since we have never built anything with Pol

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