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November 2008

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Subject:
From:
"Wilson, Bob" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Wilson, Bob
Date:
Thu, 20 Nov 2008 09:12:32 -0800
Content-Type:
text/plain
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text/plain (109 lines)
Are you using PADS as a layout tool?

 

If you are, I can tell you how to do the odd pad size.

 

Bob Wilson

E/M Designer, CID+

SpectraSensors, Inc.

11027 Arrow Route

Rancho Cucamonga, CA 91730

(909) 948-4110

www.spectrasensors.com

www.ipc.org <http://www.ipc.org/> 

 

 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gumpert, Ben
Sent: Thursday, November 20, 2008 7:26 AM
To: [log in to unmask]
Subject: Re: [TN] MELF pad shape question

 

Carl,

 

This notch is used to prevent edge overhang of the component. The pad

shape helps keep the component centered on the pad, otherwise the wider

middle of the component may overhang the pad edge even if the narrower

bottom is on the pad and soldered.

 

Ben

 

-----Original Message-----

From: TechNet [mailto:[log in to unmask]] On Behalf Of Carl VanWormer

Sent: Thursday, November 20, 2008 10:09 AM

To: [log in to unmask]

Subject: [TN] MELF pad shape question

 

A customer is using MELF parts on an existing board and is asking us to

add some more parts of a different size.  The new parts are DL-35 and

the manufacturers data sheet shows a rectangular pad as the recommended

size.  All of the MELF parts on their current board have small notches

at the middle-inside of each pad like:

 

**********                **********

**********                **********

*****                          *****

**********                **********

**********                **********

 

The customer is requesting that we make pads similar to pads on other

parts, but properly sized for the DL-35 part.

 

 


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