> What is a thermal relief connection?

OK. On the PCB you have holes (for your components)
and pads around (for soldering). You connect these
pads with traces. 
If you decide to fill everything else of the board
with a copper, you can place a polygon. If this
polygon is attached to a net (let say GND), all traces
and pads, which are not connected to it, will be
automatically cleared. The pads that are connected to
the same net (GND) may be connected directly (you'll
see only the hole) or thermally (you'll see this:
\ /
 o
/ \
or
 |
-o-
 |

If you need to solder a pad, which is connected to a
big copper polygon or a plane, you'll need much more
to heat it during soldering. To avoid this we use
thermal relief pads.
The "plane" is normally in inner layers (used for
spreading out the VCC and GND), negative image, solid
copper and pads only.


Mira




__________________________________________________
Do You Yahoo!?
LAUNCH - Your Yahoo! Music Experience
http://launch.yahoo.com

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* To post a message: mailto:[EMAIL PROTECTED]
*
* To leave this list visit:
* http://www.techservinc.com/protelusers/leave.html
*
* Contact the list manager:
* mailto:[EMAIL PROTECTED]
*
* Forum Guidelines Rules:
* http://www.techservinc.com/protelusers/forumrules.html
*
* Browse or Search previous postings:
* http://www.mail-archive.com/proteledaforum@techservinc.com
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

Reply via email to