Are humidizers unfashionable today for eliminating ESD buildup? Ours are still on day and night.
Ingemar Hernefjord
Ericsson Microwave Systems



-----Original Message-----
From: Clive ffitch [mailto:[log in to unmask]]
Sent: den 2 september 1999 17:21
To: [log in to unmask]
Subject: [TN] ESD and SMT Tape/Reels - Concern


All,

I know this has been raised before, but the picture does not seem all
that clear. So here goes.

We have an issue with some SMT part tapes and reels being supplied using
non-ESD compatible materials, where we have measured up to around 1000V
on the plastic reels, or as measured on the tapes themselves when peeled
back. Some plastics used do appear to be static dissipative/conductive,
as do some of the black tapes, but not all. The tape/reels in question
are for resistor/capacitor parts, and some SOT23s etc.

When challenged, some suppliers have said this is not an issue for other
people, and to re-package the parts would cost +300%, but we can have it
if we pay. We assemble resistors/capacitors/discretes on the same
equipment as more sensitive ESDSs, and feel sure we are not the only
people with these concerns; what we want are parts supplied using
ESD-safe tape and reel packaging. For the assembly of high reliability
equipment, we do not want to have to resort to installing ioniser farms.

However, we do not have any leverage in the market place on our own, and
our order quantities are small - even insignificant - so the question
is, ARE we alone?

Is the rest of industry getting what it wants, or do we have to adapt
our own practices to accommodate resistors and capacitors being
delivered in the packaging that suppliers say we can have them in?

All comments to TechNet most welcome.

Clive ffitch
MBUK
Stevenage, England

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