Electronics Forum: fr-5 (Page 1 of 1)

Re: PCB Material

Electronics Forum | Wed Sep 13 20:58:50 EDT 2000 | Dave F

If you don't know what you have, how the blank are we sposed to tell you? Try your local fab. CEM1 - Opaque tan CEM3 - Translucent FR2 - Opaque brown FR3 - Opaque cream FR4 - Translucent FR5 - Translucent FR6 - Opaque white G10 - Translucent G11 -

Tg - Glass transition temperature

Electronics Forum | Thu Jan 20 16:06:38 EST 2000 | Mike Naddra

Regarding glass transition , does anyone have expierance glass wiht transition temperature specification , such as what are the detrimental effects of exceeding the Tg , how long over the glass transition temperature ,if any , is acceptable. Tg of di

Re: Tg - Glass transition temperature

Electronics Forum | Fri Jan 21 14:51:08 EST 2000 | Dave F

Mike: I�d hate to see you making design decisions, based solely on the discussion here, but that this would be an impetus to consult IPC-D-279, "Design Guidelines ... " and take a course on designing reliable boards. Werner Engelmaier (Engelmaier

PDBE and PBB replacements???

Electronics Forum | Mon Apr 25 22:56:44 EDT 2005 | davef

rush316 First, no one stated that PBB and/or PCBE are in FR4. FR4 contain tetra-bromo-bisphenol A [TBBA]. Second, there are classes [and grades] of dielectric materials used in fabricating printed circuit boards. Grades, NEMA LI-1. From these gr

PCB's using Kevlar substrate

Electronics Forum | Thu May 09 17:21:39 EDT 2002 | davef

In describing a bare board, you need to talk about base, laminate, and conductive materials. Common laminate materials are: * Glass fabric * Cotton fabric * Paper Common NEMA grades of technical laminates are: * Glass Fabric Grades: G3, G7, G10,

Re: BGA Shorting problem

Electronics Forum | Wed Sep 02 08:52:13 EDT 1998 | Justin Medernach

| | We are experiencing shorting on a BGA. The part has a 1mm pitch with a 196 I/O count. The problem seems to pop up without warning & disappear in the same manner. | | Our pad design is .020" diameter pads with .025" solder resist diameter. Th

PCB Laminate Materials

Electronics Forum | Wed Jul 18 08:00:48 EDT 2001 | davef

250C flass transition temperature - M = coloring agent or opacifier added to F resin with 110-150C glass transition temperature - N = natural color of resin - P = coloring agent or opacifier added to resin - T = natural color F resin blended with

QFP208-Leads for MCM-L?

Electronics Forum | Fri Apr 17 21:46:18 EDT 1998 | Matthias Mansfeld

I plan to design a multichip module which contains 1 chip with about 200 pads and 2 chips with about 50 pads, no other components.The whole module shall replace as intermediate solution a single chip CPU in QFP208. Thus, the MCM itself must have t


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