TECHNET Archives

September 1997

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Condense Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Content-Transfer-Encoding:
7bit
Sender:
Subject:
From:
Steve Collins <[log in to unmask]>
Date:
Fri, 19 Sep 1997 12:06:57 -0600
Content-Type:
text/plain; charset=ISO-8859-1
MIME-Version:
1.0
Reply-To:
"TechNet Mail Forum." <[log in to unmask]>, Steve Collins <[log in to unmask]>
Parts/Attachments:
text/plain (39 lines)
Hello everyone hope I can get some more advice:

We had a Capacitor manufacturer in our plant the other day and we were
talking about design consideration of chip components. A statement that it
was not necessary to use thermal reliefs to connect the SM component pad to
a large ground plane (we design RF boards to 860 MHz soon to 1Gig). That
the practice of using the soldermask to define the solderable area in these
large ground planes was sufficient. This seems to go against the earlier
practices of requiring thermals to prevent thermal shock, tombstoning of
the parts & Rework considerations. We use both top side and bottom side SMT
and sometimes on the same board. Our EE's love this idea but are we asking
for trouble in reliability down the line

My question:

How are other people in the industry dealing with this issue?

Has anyone gone this rout and then returned to using thermals. If so can
you share your problems or findings.

Thanks again for everyone's help.

Steve Collins
PCB Design Supervisor
Antec Network Technologies
[log in to unmask]

##############################################################
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.
For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311
##############################################################


ATOM RSS1 RSS2