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From: "Spehro Pefhany"
Subject: Re: What PCB Quality Do You Guys Use?
User-Agent: tin/pre-1.4-19990216 ("Styrofoam") (UNIX) (Linux/2.2.14 (i586))
Date: Mon, 09 Sep 2002 14:02:53 GMT
NNTP-Posting-Date: Mon, 09 Sep 2002 10:02:53 EDT
The renowned Geraldo Sazias wrote:
> I was wondering what kind of PCB quality the engineers who are designing
> (consumer) products and who are reading this NG are using. I read that FR-2
> is the most widely used kind of PCB being used (I can confirm this in my own
> experience with consumer electronics). I personally think that the PCB
> quality has an enormous iimpact on the quality, reliabillity and durabillity
> of a product so I'm using FR-4. In light of the cost of the rest of the
> components my guesstimate is that the price differential isn't al that great
> between FR-2 and FR-4.
The board cost differential can be large, however you need to balance that
off against the need for better mechanical design and possibly additional
parts (eyelets or additional fasteners).
> What type of PCB quality are you guys using and for what application? Anyone
> know how much difference there is in pricing? And the effect on reliabillity
> in using cheaper FR-2 PCB's?
Negligible in small quantities. Quite large in large quantities, maybe
2:1. Reliability is affected negatively if paper phenolic board or
components subjected to mechanical forces are poorly
supported mechanically. With proper design there is little effect on
reliablility, durability. Problems happen when manufacturers fail to
support components such as jacks, switches, connectors, potentiometers,
large capacitors, transformers etc.
Phenolic boards (when warmed) punch beautifully with little wear on the
tools. All the holes and the outline can be punched at one time on a
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