http://www.smta.org/files/SMTAI01-Ridsdale.pdf
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Nowland, Russell
Howard (Russell)
Sent: Monday, November 29, 2004 1:51 PM
To: [log in to unmask]
Subject: Re: [TN] Via-on-pad / via-in-pad
I have not read all of the responses to this topic but I will give you an
opinion from someone that has been building product that has used both
technologies for many, many years.
Via-in-Pad by definition is a via (typically 8-10 mils) drilled into a SMT
attachment pad. This is usually done in discretes down to 0805's. I don't
recommend any smaller. You can also place them is SOIC, SOJ, SOT, etc. No
fine pitch.
Via-on-Pad is what I would term as a Blind-Via-in-Pad. This would be a
blind via that is in any pad it will fit in. Since solder drain is not an
issue you can place it in micro-discretes and fine pitch devices as well.
Sorry, but I don't have a good way to provide any cross-sections as examples
but it is not a difficult concept to visualize.
I hope this helps.
Russell Nowland
Lucent Technologies
Quail Springs Parkway Plaza
14000 Quail Springs Parkway. Suite 300
Oklahoma City, OK 73134
Phone: 405-302-1660
Fax: 405-302-1622
Cell: 405-203-0034
email: [log in to unmask]
-----Original Message-----
From: Shahed Safavi-Bayat [mailto:[log in to unmask]]
Sent: Monday, November 29, 2004 12:16 PM
To: [log in to unmask]
Subject: Re: [TN] Via-on-pad / via-in-pad
Hi
here is picture of cross section for VIP/VOP
http://www.topsearch.com.hk/en/0_VOP_VIP.htm
but as Bob pointed out is mostly a naming thing for designers.
Best Regards,
Shahed
-----Original Message-----
From: Sefika Ozkal [mailto:[log in to unmask]]
Sent: Monday, November 29, 2004 2:05 AM
To: [log in to unmask]
Subject: Re: [TN] Via-on-pad / via-in-pad
Hello,
I have not seen any example of via-in-pad and via-on-pad yet. So I am not
sure if I can determine which one is via-on-pad and the other is via-in-pad
because I can not imagine.
Do they have differences because of design, manufacture, or assemly?
Regards,
Sefika OZKAL
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Bob Wilson
Sent: Saturday, November 27, 2004 4:49 PM
To: [log in to unmask]
Subject: [TN] Via-on-pad / via-in-pad
Hello!,
Fom a designer point of view, there is no difference.
It is just a naming thing.
If the via is on a pad, it's in it.
I love 'em because they reduce layers and open up
channels for routing signals.
Any questions, don't hesitate to email me. I can send
you screen shots of notes and stackups.
Best regards,
Bob Wilson, CID
http://www.cstone-design.com/home.html
>
> 1. Via-on-pad / via-in-pad
> >
> Date: Fri, 26 Nov 2004 14:40:57 +0200
> From: Sefika Ozkal <[log in to unmask]>
> Subject: Via-on-pad / via-in-pad
>
> Hi,
>
> What is the difference between via-in-pad and
> via-on-pad? Can someone
> explain?
>
> Lovely day
>
> Sefika OZKAL
> ASELSAN INC.
> MGEO Division
> Tel:+ 90 312 84 75 300
> Fax:+90 312 84 75 320
> e-mail:[log in to unmask]
>
>
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