[PCB_FORUM] Re: 0402, 0603 round pads

From: <george.h.patrick@xxxxxxxxxxxxxx>
To: <icu-pcb-forum@xxxxxxxxxxxxx>
Date: Fri, 5 Jan 2007 09:02:56 -0800
 
Nope.  We are using 20 mil square for 0402, and 39 mil square for 0603.
 
-- 
George Patrick
Tektronix, Inc.
Central Engineering, EDS Applications Support
P.O. Box 500, M/S 39-512
Beaverton, OR 97077-0001
* 503-627-5272 (voice)     * 503-627-5587 (fax)
<http://www.tektronix.com/> 
http://www.tektronix.com     <http://www.pcb-designer.com/>
http://www.pcb-designer.com
 
"Off-Grid and Proud of it!"

-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Macindoe, Gary
Sent: Thursday, January 04, 2007 15:26
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: 0402, 0603 round pads



Thanks for the reply George.  So Tek isn't using round pads for 0402s
and 0603s?

The round pad thing could just be a legacy thing.

 

Gary

 

  

Gary E. MacIndoe

PCB Design Engineer

Longmont, Colorado

 

amd.com

gary.macindoe@xxxxxxx


  _____  


From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of
george.h.patrick@xxxxxxxxxxxxxx
Sent: Thursday, January 04, 2007 4:20 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: 0402, 0603 round pads

 

 

15 years ago when I was setting up the SMD libraries at a previous
employer, we were told by a consultant that wave soldered joints were
better if the pads had a radius instead of a "sharp" corner.  This was
supposedly because the meniscus of the molten solder conformed more
easily to a curved surface than a corner.  I guess you could consider a
round pad to be "fully radiused" :)

 

YMMV.  I don't recall if it helped the yields or not.

 

-- 
George Patrick
Tektronix, Inc.
Central Engineering, EDS Applications Support
P.O. Box 500, M/S 39-512
Beaverton, OR 97077-0001
* 503-627-5272 (voice)     * 503-627-5587 (fax)
<http://www.tektronix.com/> 
http://www.tektronix.com     <http://www.pcb-designer.com/>
http://www.pcb-designer.com
 
"Off-Grid and Proud of it!"

-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Macindoe, Gary
Sent: Thursday, January 04, 2007 15:05
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] 0402, 0603 round pads

Hey guys,

 

Man has it been quiet (or am I not receiving forum e-mails?).

 

So, I've been looking at some designs from a couple of other groups
within the company.

Both of them have their 0402 and 0603 foot prints with round pads (0402
= rd25).

 

Is anyone out there also using round pads for 0402s and 0603s, and why?

 

They have oval pads for their 0805s and 1206s also.

 

I still have square or rectangular for all of the above.  Could it have
something to do

with lead free?

 

Thanks and Happy New Year!

 

Gary

 

 

Gary E. MacIndoe

PCB Design Engineer

Longmont, Colorado

 

amd.com

gary.macindoe@xxxxxxx
References:

[PCB_FORUM] Re: 0402, 0603 round pads
From: Macindoe, Gary
[PCB_FORUM] Re: 0402, 0603 round pads

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