[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
* 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

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