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Subject: Re: PCB qn: What's the significant difference between FR 1, 2,3,4?
Date: Wed, 2 Oct 2002 09:49:46 +0100
Organization: Kijoma Solutions Ltd
NNTP-Posting-Date: 2 Oct 2002 08:52:19 GMT
X-Newsreader: Microsoft Outlook Express 5.50.4807.1700
The different FRs are made of different materials with different
TV sets and other consumer budget driven items use the Paper dielectric (FR2
i think) for its cheapness in volume.
most people use FR4 as its fibreglass hence tough and has a reasonably
controlled dielectric constant (for RF / controlled impedance circuits).
do a search on www.google.com , i am sure you will find some documents on FR
Kijoma Solutions Ltd
RF - Analogue - Digital - Software
Electronic Product Design & Consultancy
Email : news@kiSPjoAMma.com ( remove the spam)
There are only 10 types of the people in the world
those who understand binary and those who don't
"The little lost angel" wrote in
> Was looking for ways to make my own PCB, came across a site that said
> something about use only FR4 PCB.
> Googling around, I get some bare facts about FR1~4.
> Some stuff about TG between 105 to 135 degrees celsius. The materials
> used to make them and that FR stands for Fire Retardent.
> BUT, what's the significance??
> I can understand the TG bit, I suppose it refers to the ambient
> temperature the PCB can handle. But how does it relate to which is
> better for what? Or is it simply FR1 is the oldest type, FR4 is the
> newest and across the board, FR4 is better than FR3 > FR2 > F1?
> I mean surely, the industry don't just make several categories for
> fun, right?
> Thanks for any clarification!
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