Subj:   Re: [TN] Help!! Big problem (solder resist vs die attach)
Date:   27/02/99

Tell manufacturing to use a nonconductive adhesive.
They should have no problem going back to their adhesive supplier and
identifying a non conductively filled version of the resin system they
presently use - which will answer the next objection. THis will give them
desirable minimal change  and almost identical handling and cure
characteristics  etc for easy change over.
The only reason - apart from ease of ordering and similar -  for using an
electrically conductive adhesive on a non electrically conductive surface is
for its thermal conductivity, so you might like to check that out before
making your suggestion.


Mike Fenner
............
In a message dated 25/02/99  07:27:17PM,  [log in to unmask] writes:

>
>  Hi Designers,
>
>          I'm in need of help!  I have completed a design with some L157 IC's
>  on the Board. And Manufacturing came back to me after I finished the design
>  and was about to ship it and said that they use a conductive epoxy to
>  adhere the die to the Board and they're worried that if the Solder Resist
>  has pin holes in it that it could leak a signal into the runners below
>  those Die.  They said they could use Pre-Forms but that would kill their
>  yeild so they want me to reroute the traces below those die. Unfortuatley
>  that would be a nightmare and add at least a week to my time.  So can
>  anyone tell me where I can get info to help prove that this won't be a
>  problem or are they right and there's a good possiblitiy that this could
>  happen.
>
>  Thank you,
>
>  Greg Bodi
>

################################################################
TechNet E-Mail Forum 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's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################