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Subject: Thermal Relief Design
Author: [email protected] at SMTP
Date: 6/16/97 10:50 AM
I am designing a backplane that uses Positronics power connectors as its
interface to the the power supply. The pin in the backplane solders into a
0.070" diameter hole. Each pin can carry up to 15A and there are up to five 2
oz. planes in the stackup that connect to the hole.
My dilemma is heat vs. dc resistance. I need to use a thermal relief on all 5
planes that will allow me to heat the hole enough for solder to flow. However,
the thermal releif connection cannot be resistive enough to cause a problem with
IR drop.
The male/female mated total resistance is 1.7 milliohms.
Anybody have any experience with this problem?
Chris Heard
3Com Corporation
118 Turnpike Rd.
Southboro, M.A. 01772
508-490-5616