The static measured from ripping off a tape can indeed be large, but somewhere in the
back of my mind something is buzzing around about insulated/isolated bodies so that
the problem is not a problem till the potential on the isolated body -ie your
device - is let go by earthing (US speak = grounding). Or something. Anyway the
answer is to let it discharge slowly maybe by using a local ioniser or perhaps
humidifier. [I think this is the same problem helicopters can have when coming up to
ships, also the Hindenberg.....]
Mike Fenner
BSP, OX15 4JQ, England
T: +44 1295 722 992
M: +44 789 999 7715
F: +44 1295 720 937
-----Original Message-----
From: Matthew Lamkin <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: 03 September 1999 18:51
Subject: Re: [TN] ESD and SMT Tape/Reels - Concern
>Your not on your own!
>I have just had a look at ours & they're not in antistatic tape/reels.
>Some reels arrive in anti static bags, but that's the most it appears to
>be.
>
>I guess that I'll have a word with our Q/A dept about that one....
>
>Matthew Lamkin
>Printed Circuitboard Draughtsman
>Protec Hse, Churchill way,
>Nelson, Lancashire.
>England UK.
>Email [log in to unmask]
>The E-mail and any attachments hereto are strictly confidential and
>intended solely for the addressee.
>If you are not the intended addressee please notify the sender by return
>and delete the message.
>You must not disclose, forward or copy this E-mail or attachments to any
>third party without the prior consent of the sender.
>In addition, any opinions expressed in this E-mail are solely that of
>the sender and must not be taken as that of the senders employer.
>Boy, is this a long signature or what !!
>
>>
>><SNIP>
>>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.
>><SNIP>
>>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?
>><SNIP>
>>
>
>##############################################################
>TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
>##############################################################
>To subscribe/unsubscribe, send a message to [log in to unmask] with following text in
>the body:
>To subscribe: SUBSCRIBE TECHNET <your full name>
>To unsubscribe: SIGNOFF TECHNET
>##############################################################
>Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
>information.
>If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or
>847-509-9700 ext.5365
>##############################################################
>
##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in
the body:
To subscribe: SUBSCRIBE TECHNET <your full name>
To unsubscribe: SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or
847-509-9700 ext.5365
##############################################################
|
