Hello,
Am I right in assuming that your trace is fusing open circuit.
I've not had any problems with these charts, a 0.070" (1.8mm)trace should be
ok.
A 0.007" would not though.

regards,

Phil.


Phil Dutton C.I.D.
Senior CAD Technician
IPC Certified Interconnect Designer

Tenix Defence Systems Pty Ltd
Systems Division - Adelaide
Second Avenue, Technology Park,
Mawson Lakes.  SOUTH AUSTRALIA  5095

================================
Phone   (08) 8300 4400 (reception)
        (08) 8300 4481 (direct)
Fax             (08) 8349 7420
email           [log in to unmask]
Internet Page   http//www.tenix.com
================================


-----Original Message-----
From: Amira Mohammed [mailto:[log in to unmask]]
Sent: Sunday, 25 February 2001 20:05
To: [log in to unmask]
Subject: [DC] Trace width


Dear all,

I have a question about how we can calculate practical values for trace
width.
In IPC-D-275 there is a chart for this, but when I used it I felt the value
is not practical.for example when I have 5 Amp current flow in a trace
cusing tempreture rise 20 and 1oz/ft2 the width is about 0.07in ,additionaly
when this take place we have an electron migration problem (trace is
broken),so can any one help me?

thanks in advance
with best regards

Amira Mohamed
PCB Designer
IEP
www.bahgat .com

---------------------------------------------------------------------------------
DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF DesignerCouncil.
To set a vacation stop for delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------