-----Original Message-----
From: Stadem, Richard D. 
Sent: Monday, June 12, 2006 2:01 PM
To: [log in to unmask]
Subject: RE: [TN] Conductive vs. NonConductive

Gene,
In terms of discussing ESD issues, you are correct. In terms of
discussing electrical issues, such as with vias, this does not apply. If
I get a pwb with "conductive" vias that measure 1 x10^4 ohms, well, let
me just say that I would have some troubles, indeed. 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gene Felder
Sent: Monday, June 12, 2006 1:50 PM
To: [log in to unmask]
Subject: Re: [TN] Conductive vs. NonConductive

Materials are either conductors or non-conductors. Non-conductors are
also called insulators and have a resistance of 1 x 10E11 ohms or
greater.
Dissipative material is conductive, able to remove ElectroStatic charges
to ground, however dissipative is defined as at least 1 x 10E4 ohms and
less than 10E11 ohms.  Dissipative material has the ESD control benefit
of more slowly transferring electrostatic charges and is used to avoid
rapid discharge from ESD sensitive items.  Conductive material is
defined as less than 10E4 ohms.

ANSI/ESD S541 section 7.2.1 Resistance of Conductive Materials
"Conductive materials may be surface conductive, volume conductive, or
both. A surface conductive material shall have a surface resistance of
less than 1.0 x 10^4 Ohms. Volume conductive materials shall have a
volume resistance of less than 1.0 x 10^4 Ohms."

ANSI/ESD S541 section 7.2.2 Resistance of Dissipative Materials "A
static dissipative material shall have a surface resistance of greater
than or equal to 1.0 x 10^4 Ohms but less than 1.0 x 10^11 Ohms.
Packaging materials that are in intimate contact with devices should be
dissipative."

ANSI/ESD S541 section 7.2.3 Resistance of Insulative Materials "An
insulative material shall have a surface resistance of greater than or
equal to 1.0 x 10^11 Ohms, or a volume resistance of greater than or
equal to 1.0 x 10^11 Ohms."

Gene Felder
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Darrel Therriault
Sent: Monday, June 12, 2006 11:40 AM
To: [log in to unmask]
Subject: [TN] Conductive vs. NonConductive

Technet,

The terms "Conductive" vs "NonConductive" came up in a discussion of a
blind/buried via fab today and these were new terms to me relative to a
PWB.

Can anyone provide a brief definition of this or point me to something
that explains it in terms of a fab.  Unfortunately, the person that made
the statement was more of a procurement person that was quoting specs,
but did not really have an explanation of the requirement or difference.

Is this an industry standard (new) term associate with PWB requirements,
or is this just something someone used and its been passed on.


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