Guy,
These are micro8 and sop packages, 25 mil pitch.
Leads may be up to 18 mils wide, while land is only 13 mils (nominal lead
width).
All I have found so far are requirements that do not say a side fillet is
req'd. I would like to find a standard that states a side fillet is not
required.
Thanks for the help,
FNK
Hey Steve,
If you are watching, what is your take on side fillets?
How do you interpret IPC-610 figure 12-71?
Earl,
comments?
Werner,
What loss in integrity and/or reliability is caused by no side fillet?
Thanks to Peter and Gary for your replies, they are reinforcing my case.
Frank N Kimmey, C.I.D.+
Senior PCB Designer
Powerwave Technologies
PH. 916-941-3159
Fax 916-941-3195
-----Original Message-----
From: Guy Ramsey [mailto:[log in to unmask]]
Sent: Tuesday, May 21, 2002 5:58 AM
To: [log in to unmask]
Subject: Re: [TN] Side fillet requirements
Something is wrong. What type of component are we discussing? Side joint
requirments are specific to component types.
If there is a compliant land pattern that is narrower than the lead width it
would be new to me.
I have seen "compliant design" reduced by undercut resulting land patterns
like you describe.
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Frank Kimmey
> Sent: Monday, May 20, 2002 6:17 PM
> To: [log in to unmask]
> Subject: [TN] Side fillet requirements
>
>
> I have a customer who would like us to justify why our IPC-782 compliant
> footprints do not allow for a side fillet (pad width is equal to
> or smaller
> than lead width). I did not find conclusive statement in IPC-610
> concerning
> this. Please help me define acceptance.
>
> Thanks,
> FNK
>
> Frank N Kimmey, C.I.D.+
> Senior PCB Designer
> Powerwave Technologies
> PH. 916-941-3159
> Fax 916-941-3195
----------------------------------------------------------------------------
-----
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt delivery of Technet send e-mail to [log in to unmask]: SET
Technet NOMAIL
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
ext.5315
----------------------------------------------------------------------------
-----
---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------
|
