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May 2001

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Subject:
From:
"<Peter George Duncan>" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 22 May 2001 08:58:29 +0800
Content-Type:
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I had an engineer once who thought the same, but I concluded it was a
wishful thought and misguided justification for not bothering to go to a
static protected area with the parts. The foam is fine while inside proper
packing, but the pink stuff is not very wonderful protection against static
(or it used not to be). Components can suffer static damage even in the
foam if the handler has not been grounded first.

Ask him where his proof is for this piece of knowledge. Most components are
less sensitive to static once they are in an assembly, but that doesn't
mean they're completely safe, and why take needless chances? I was taught
that a component or an assembly is only protected when completely
surrounded by static protective material - something akin to lightening
travelling round the skin an aircraft fuselage instead of through it. Just
having a layer of protective material between you and the assembly is not
accepted as sufficient.ANSI/ESD S20.20 should help solve the dispute

Pete Duncan



                    Neda Thrash
                    <nthrash@PEAV        To:     [log in to unmask]
                    EY.COM>              cc:     (bcc: DUNCAN Peter/Asst Prin Engr/ST Aero/ST Group)
                    Sent by:             Subject:     [TN] ESD Approved Packing Foam vs. Static
                    TechNet              Shielding Bags
                    <[log in to unmask]
                    ORG>


                    05/22/01
                    01:30 AM
                    Please
                    respond to
                    "TechNet
                    E-Mail
                    Forum.";
                    Please
                    respond to
                    Neda Thrash






** High Priority **

Hello everyone! I need help settling a dispute. I am aware of the fact that
the pink foam designed for packing esd sensitive assemblies helps eliminate
the possibility of a charge being generated during a transport while
cushioning the product but I have an engineer telling me that the
assemblies are safe if holding  the assembly in hand while ungrounded as
long as the foam separates the hand at the point the pcb is held. If
someone knows this to be true please send me more information on this
because this contradicts what I have always been taught and what I am
teaching. I need your help ASAP!

TIA, Neda

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