[PCB_FORUM] Re: 0402, 0603 round pads

I like snow. We do low volume and sooner or later I would like to try the round pad idea. If we scraped some boards it wouldn't be a large quantity.
 
 
-----Original Message-----
From: Gary.Macindoe@xxxxxxx
To: icu-pcb-forum@xxxxxxxxxxxxx
Sent: Fri, 5 Jan 2007 10:49 AM
Subject: [PCB_FORUM] Re: 0402, 0603 round pads

We are using 25 mil square for 0402 and 40 mil square for 0603.  We do very low volume in our group and some of the boards are hand assembled!
 
Regards,
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: Friday, January 05, 2007 10:03 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: 0402, 0603 round pads
 
 
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
Å 503-627-5272 (voice)     Æ 503-627-5587 (fax)
http://www.tektronix.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
Å 503-627-5272 (voice)     Æ 503-627-5587 (fax)
http://www.tektronix.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
 
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