[PCB_FORUM] Re: 0402, 0603 round pads

  • From: "Jean Bratton" <jean.bratton@xxxxxxxxxxxxxx>
  • To: <icu-pcb-forum@xxxxxxxxxxxxx>
  • Date: Fri, 5 Jan 2007 08:15:20 -0800

No, CM as in Contract Manufacturer...the folks responsible for actually
making the part stick to the board:-)

 

________________________________

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Macindoe, Gary
Sent: Friday, January 05, 2007 11:02 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: 0402, 0603 round pads

 

Jean,

 

Do you mean CM as in Component Manufacturer?  Well, I have design
guidelines from Celestica and Solectron (both 3-4 years old).

They both show square/rectangular pads for all discrete SMT shapes.

 

Our little group here in CO is about to be assimilated into the mother
corp. as far as fab/assembly is concerned, and I don't even

know at this time who to ask about the round pad thing.  I was wondering
if it was a lead free thing for wave soldering.

 

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 Jean Bratton
Sent: Thursday, January 04, 2007 4:33 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: 0402, 0603 round pads

 

I've seen 0402's with cut corners so they fit within the pin escape
pattern of a 1mm bga, but that's all. What does your CM have to say?

 

________________________________

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Macindoe, Gary
Sent: Thursday, January 04, 2007 6:05 PM
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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