275 ipc and 2221 results

Electronics Forum: ipc and 2221 (Page 8 of 28)

conformal coatings and flux compatability

Electronics Forum | Tue May 23 12:18:25 EDT 2000 | mike weekes

Which companies would you consider for protective coatings, (conformal coating) and other levels of protection? I am taking a fresh look at alternatives. Know any good tests for testing compatability of coating with flux - aqueous or no clean? SMT

Bow and twist of PCB's

Electronics Forum | Fri Apr 20 07:12:22 EDT 2001 | wbu

Dougie, oh yes, it�s a bit short that chapter. I have the Revision e in front of me and this one contains in the appendix the needed IPC-TM-650 Test method for bow and twist. Can�t think that they don�t have that in the new revision. Hope you find

Bow and twist of PCB's

Electronics Forum | Mon Apr 23 11:44:55 EDT 2001 | CAL

650 Standards are also located in the back of IPC JSTD-001. I am currently looking at 4 pages on bow and twist. Percent bow = R1-R2/L x 100 (R1= Highest point; R2=lowest or resting point; l= length) Percent twist=(R1-R2)/(2xL)x 100 Sorry if this is

Re: BGA and Land Patterns

Electronics Forum | Tue Apr 27 13:00:05 EDT 1999 | Justin Medernach

| What is the current spec for sizing PCB pads for a land grid array? How about for a ball grid array? Are there industry spec's I can reference? | | Thanks, | | Frank | Frank, Refer to the device manufacturers. they are going to have a recomme

board stretch and IPC -D-300G

Electronics Forum | Mon Nov 12 17:12:40 EST 2001 | slthomas

Thanks, Dave. Three courtesy cheers for specifications written to reflect the capabilities of the part suppliers, even if they fail to meet the purchaser's (not unreasonable) process req'ts. In the meantime, I'm sure my stencil guy would be more

V-scoring design and equipment questions

Electronics Forum | Mon Jun 12 18:44:30 EDT 2006 | muse95

OK, Pete, I just looked all through IPC-A-600G. Saw no mention of scoring anywhere. Please provide specific section number info. Thanks By the way, Chris, thank you for the information - that is really interesting stuff. Would you be willing to a

Re: BGA and Land Patterns

Electronics Forum | Wed Apr 28 14:41:45 EDT 1999 | Bob Willis

| | What is the current spec for sizing PCB pads for a land grid array? How about for a ball grid array? Are there industry spec's I can reference? | | | | Thanks, | | | | Frank | | | Frank, | Refer to the device manufacturers. they are going t

Bow and Twist of PCB's

Electronics Forum | Wed Aug 19 05:00:56 EDT 1998 | Tom Blum

Hi there, I'm actually facing a lot of trouble with PCB's presenting up to 3mm of bow /twist at reception i.e. before assembly. The PCB size is 220 by 230mm. The boards are to be assembeled SMD double sides with 05.mm pitch on both sides. In order to

Pick and Place Machine Validation

Electronics Forum | Mon Mar 28 22:29:42 EST 2005 | msivigny

Appreciate the feedback SMTUser & link referral PeteC! Late 2004, EAGLE-EYED ONE changed its name to CeTaQ Americas. Still the same business, people and quality products and services. Changed for global synergy with our German parent and in support o

Solder beads and wave soldering

Electronics Forum | Thu Jul 06 03:03:56 EDT 2006 | ronalds

Thank you all for your input. The MF300S Multicore flux is rated for lead free. There is not much dross or contamination. We are using nitrogen. I've tested the boards with the curing test of IPC-TM-650. I think you're all right about the preheat.