Joyce,
Thanks for the link, that was great! It answered many questions and made more too... :-) (Side note, I couldn't get that link to work, but I just put in the document name in Google and it came right up.) Enjoy!
Later...
Scott Decker – Staff Engineer, PCB Design Services CID+ – Electronic Systems Center
UTC AEROSPACE SYSTEMS
3445 S. 5th Street, Suite 170, Phoenix, AZ 85040 U.S.A.
Tel: 602 308 5957 FAX: 602 243 2347
KE7MWT AKA:PadMasterson
[log in to unmask] www.utcaerospacesystems.com
CONFIDENTIALITY WARNING: This message may contain proprietary and/or privileged information of
UTC Aerospace Systems and its affiliated companies. If you are not the intended recipient please 1) do not disclose, copy,
distribute or use this message or its contents, 2) advise the sender by return e-mail, and 3) delete all copies (including all
attachments) from your computer. Your cooperation is greatly appreciated.
This Document Does Not Contain Export Controlled Technology Or Technical Data.
-----Original Message-----
From: Yuan-chia Joyce Koo [mailto:[log in to unmask]]
Sent: Tuesday, February 27, 2018 10:46 AM
To: TechNet E-Mail Forum <[log in to unmask]>; Decker, Scott UTAS <[log in to unmask]>
Subject: [External] Re: [TN] Non Functioning pads
https://urldefense.proofpoint.com/v2/url?u=http-3A__www.dfrsolutions.com_hubfs_DfR-5FSolutions-5FWebsite_Resources-2D&d=DwIF-g&c=ilBQI1lupc9Y65XwNblLtw&r=Z5GKU9L_wgbp5uvPzUdN9HWtU4lRZiIaLoTaEwcy40w&m=CL4to_9kQ9VA-IpwSjgQlMsVVG1zhifwy71WAcrv1VU&s=Rsk0T9R4cNnpsMNYtaOMrBxIrY-aid3yP9z1j_q6Wbk&e=
Archived/White-Papers/Reliability/Non-Functional-Pads-Should-they-
Stay-or-Should-they-Go.pdf
On Feb 27, 2018, at 12:36 PM, Decker, Scott UTAS wrote:
> I agree with Richard. I was a firm believer in keeping them to protect
> the via barrels from cracking, so no way was I going to do it. Then
> there was a study done many years ago, (I don't remember who did it)
> that showed that only for very thick boards, like .120"
> or more, was there any benefit to leaving them in. That benefit was
> very small and it was not as much as you get from the Fabricator and
> such, for the extra space you got... That said, we pull them on all of
> our boards and we do class 3's all the time. One additional thing I
> just thought of. In the past I used a lot, (ok almost exclusively
> polyimide boards) and I believe that was where the benefit was a good
> one, but I don't remember now for sure since we don't use Polyimide
> here. :-]
>
>
> Scott Decker – Staff Engineer, PCB Design Services CID+ – Electronic
> Systems Center UTC AEROSPACE SYSTEMS
> 3445 S. 5th Street, Suite 170, Phoenix, AZ 85040 U.S.A.
> Tel: 602 308 5957 FAX: 602 243 2347
> KE7MWT AKA:PadMasterson
> [log in to unmask] www.utcaerospacesystems.com
>
> CONFIDENTIALITY WARNING: This message may contain proprietary and/ or
> privileged information of UTC Aerospace Systems and its affiliated
> companies. If you are not the intended recipient please 1) do not
> disclose, copy, distribute or use this message or its contents, 2)
> advise the sender by return e-mail, and 3) delete all copies
> (including all
> attachments) from your computer. Your cooperation is greatly
> appreciated.
> This Document Does Not Contain Export Controlled Technology Or
> Technical Data.
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D
> Sent: Tuesday, February 27, 2018 10:19 AM
> To: [log in to unmask]
> Subject: [External] Re: [TN] Non Functioning pads
>
> I don't see why not, unless they are used for capacitance or antennae.
> If they are NOT used for those purposes, then they should be removed
> for the same reason.
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Larry
> Sent: Tuesday, February 27, 2018 11:12 AM
> To: [log in to unmask]
> Subject: [TN] Non Functioning pads
>
> Is there any reason I cannot remove non functioning pads on the inner
> layers for an Class 3 PCB?
>
> Many thanks,
>
> Larry
|
