Electronics Forum | Tue Mar 21 17:32:48 EST 2000 | Charles Barker
Greetings all you knowledgable SMT persons! 1. Typically, for multi-layer (6-8 layers), FR4, SMT boards stored in an air conditioned environment at about 50+/- 10% RH, how many months (or years) would you allow to pass before you would recommend bak
Electronics Forum | Tue Aug 22 13:04:04 EDT 2000 | Eugene Smelik
Dr. Lee, Given the higher reflow temperatures for Pb-Free assembly, will common FR4 laminate materials be adequate, or do you believe that higher glass content boards will be required for mainstream Pb-free assembly? As a corollary question - if man
Electronics Forum | Mon Feb 08 16:12:36 EST 1999 | Leonard Levy
Has anyone had any experience in using SMT to mount an organic (FR-4, Getek) rider card onto an organic (FR-4, Getek) mother board? By SMT I mean the attachment of the rider card would be through pads directly to pads on the mother board. Thanks,
Electronics Forum | Sat Nov 03 05:41:07 EST 2001 | Ben
Hi Could somesomeone help to let me know can bare PCB (FR4) is damaged by thermal shock? Can difference of CTE from copper or solder to FR4 damage PCB from apply heat too fast? Any specification or standard can i refer? Thank you Ben
Electronics Forum | Wed Apr 14 12:23:59 EDT 2004 | Ted
Hi everyone! I am looking for a lead-free solder that will survive a customer reflow of 260C. I am currently using SN10/Pb88/Ag02 but the reflow temperature is to high (320C) for the FR4 boards that we have. I know there are higher temp FR4 boards
Electronics Forum | Wed Jul 29 18:51:29 EDT 2020 | davef
You're asking about unclad FR4 [G10 is not flame retardant] Just ask for 0/0 unclad FR4. Thicknesses: 0.010", 0.020", 0.031", 0.047", 0.059" 0.090" & 0.118" "What do you folks do when you need custom formers?" Call Butler Winding [I receive no benef
Electronics Forum | Mon May 03 15:16:01 EDT 2021 | capse
Thin FR4 can be routed with a CO2 laser with high quality results, the edge is precise and free of slag. The process is extremely low stress. If the edges are straight you can consider sawing. 0.4mm (0.016") FR4 can be laser routed and sawn at spee
Electronics Forum | Thu Jun 25 15:33:51 EDT 1998 | Earl Moon
| | Hi there, | | Does any one know what is TCE for fully wet saturated FR4. I came to know that for Dry FR4 the TCE is about 15-19 PPM �C. Is that true? | | | | Appreciated for your help. | | rgs, | | chiakl | Chiakl, | It looks like you are speaki
Electronics Forum | Wed Nov 28 22:33:24 EST 2007 | davef
There is no specification for lead-free HASL. You can use any lead-free solderability protection that meets your customer requirements. Use IPC-9701 �Performance Test Methods and Qualification Requirements for Surface Mount Solder Attachments� to ass
Electronics Forum | Tue Sep 05 16:04:43 EDT 2000 | Dave F
Pascal: Responding to your questions: 1 Do we have to dry the PCB after cleaning (sic)? Generally, nothing says you have dry the PCB after aqueous cleaning. Along this line, I received several thoughtful responses when I posted a similar thread.
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