Try Vishay Sfernice TS53YL available from Newark & Mouser.
Regards,
Steve Smith
Product Engineer
Staco Energy Products Co.
Web Site: www.stacoenergy.com
-----Original Message-----
From: Race, Albert [mailto:[log in to unmask]]
Sent: Wednesday, March 19, 2003 2:37 PM
To: [log in to unmask]
Subject: [DC] Looking for 2nd source for component....
Good afternoon,
Does anyone out there know of a direct replacement for a bourns 3224x series potientiometers. or of any sources that might have these commonly available. I am interested in :
5K - 3224x-1-502E
2K - 3224x-1-202E
10K - 3224x-1-103e
Any help would be greatly appreciated... Thank you in advance...
Regards,
Albert
Albert F. Race, C.I.D.
PCB Designer
Roper Scientific
3660 Quakerbridge Road
Trenton, NJ 08619
Phone: 609-587-9897 x203
Fax: 609-587-1970
[[[[ [log in to unmask] ]]]]
> -----Original Message-----
> From: Jack C. Olson [SMTP:[log in to unmask]]
> Sent: Tuesday, March 18, 2003 2:06 PM
> To: [log in to unmask]
> Subject: Re: [DC] Clearance rules.
>
> That is a very good answer, thank you for explaining it.
>
> Can you also explain why you use 10mil via-to-pad?
> Do you tent vias?
> If so, do you cover them completely or only up to the drill size?
>
> thanks again,
>
> Jack
>
>
>
>
> |---------+------------------------------->
> | | george.h.patrick@EXG|
> | | ATE.TEK.COM |
> | | Sent by: |
> | | DesignerCouncil |
> | | <DesignerCouncil@ipc|
> | | .org> |
> | | |
> | | |
> | | 03/18/2003 12:40 PM |
> | | Please respond to |
> | | "(Designers Council |
> | | Forum)"; Please |
> | | respond to |
> | | george.h.patrick |
> | | |
> |---------+------------------------------->
>
> >---------------------------------------------------------------------
> >----
> -----------------------------------------------------|
> |
> |
> |
> |
> |
> |
> |
> |
> |To: [log in to unmask]
> |
> |cc:
> |
> |
> |
> |
> |
> |
> |
> | Subject: Re: [DC] Clearance rules.
> |
>
> >---------------------------------------------------------------------
> >----
> -----------------------------------------------------|
>
>
>
> Caterpillar: Confidential Green Retain Until: 04/17/2003
> Retention Category: G90 -
> Information and
> Reports
>
>
>
>
> Jack:
>
> Consider this:
>
> If you have a trace 5 mils from a pad you may not be able to guarantee
> total coverage of that trace by soldermask. If your vendor uses a
> copper to soldermask registration tolerance of +/- 3 mil (not
> uncommon), they probably
> will require a 3 mil clearance from pad to soldermask edge so they can
> always keep soldermask off the pad. This means if the registration is
> right
> on, you will have 2 mils of soldermask between the pad and trace. Now,
> what
> if the registration DOES slip by 3 mil? The boards are within tolerance,
> but your trace is hanging 1 mil out from under the soldermask. Hope the
> paste doesn't come off the pads, the tolerance for that is usually +/- 5
> mils and if it is touching both the exposed trace AND the pad it'll
> probably
> bridge...
>
> This is why we usually keep trace to pad at least 6 mil unless we are
> VERY packed, and keep visa to pad at around 10 mils (except under .8
> or less pitch BGAs), even more if we are wave soldering
>
> Probably not a lot of chance of all this happening at once, but ol'
> Murphy has ALWAYS been an optimist. :)
>
> --
> George Patrick
> Tektronix, Inc.
> Central Engineering, PCB Design Group
> P.O. Box 500, M/S 39-512
> Beaverton, OR 97077-0001
> Phone: 503-627-5272 Fax: 503-627-5587
> http://www.tektronix.com <http://www.tektronix.com>
> http://www.pcb-designer.com
>
> It's my opinion, not Tektronix'
>
>
>
>
> -----Original Message-----
> From: Jack C. Olson [mailto:[log in to unmask]]
> Sent: Tuesday, March 18, 2003 9:24 AM
> To: [log in to unmask]
> Subject: Re: [DC] Clearance rules.
>
>
> I am curious why your via-to-via and via-to-pad clearances are so
> large. To me, the edge of a via pad is no different than the edge of a
> trace, so why can't the clearance be the same 5 mils? (as long as you
> maintain your drill to copper, that is) I don't know if I could even
> route a board with 14mil clearances!
>
> I haven't done .8mm BGAs, only 1mm.
>
> Good Luck,
>
> Jack
>
>
>
>
> |---------+---------------------------->
> | | "Noah Fenley |
> | | C.I.D." |
> | | <[log in to unmask]
> | | BIZ> |
> | | Sent by: |
> | | DesignerCouncil |
> | | <DesignerCouncil@|
> | | ipc.org> |
> | | |
> | | |
> | | 03/18/2003 09:40 |
> | | AM |
> | | Please respond to|
> | | "(Designers |
> | | Council Forum)"; |
> | | Please respond to|
> | | "Noah Fenley |
> | | C.I.D." |
> | | |
> |---------+---------------------------->
>
> >
> ----------------------------------------------------------------------
> ----
> -
> ---------------------------------------------------|
> |
> |
> |
> |
> |
> |
> |
> |
> |To: [log in to unmask]
> |
> |cc:
> |
> |
> |
> |
> |
> |
> |
> | Subject: [DC] Clearance rules.
> |
>
> >
> ----------------------------------------------------------------------
> ----
> -
> ---------------------------------------------------|
>
>
>
> Caterpillar: Confidential Green Retain Until: 04/17/2003
> Retention Category: G90 -
> Information and
> Reports
>
>
>
>
> My company has an Allegro and a Pads department. We design mostly
> proto- type boards. We are trying to establish a standard set of
> clearance rules. The IPC standards are too large for the density of
> the majority of our boards. I have used a 16/8mil via for .8mm BGA on
> a .093 board, but only after confirmation from the board shop. I would
> like to have the opinions of people outside of the company. Below is a
> list of the Pads start list. Via to Pad = 14mil Via to Trace = 5mil
> Via to Via = 14 mil
> Trace to Pad = 5mil
> Drill to trace =10mil
>
> I am also curious how other handle the .8mm BGAs.
>
> Thank you for any assistance.
>
> ----------------------------------------------------------------------
> ----
> --
>
> -----
>
> DesignerCouncil 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
> DesignerCouncil. To set a vacation stop for delivery of
> DesignerCouncil send: SET DesignerCouncil NOMAIL
> Search previous postings at: www.ipc.org > On-Line Resources & Databases >
> E-mail 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
> --------------------------------------------------------------------------
> --
>
> -----
>
> ----------------------------------------------------------------------
> ----
> --
>
> -----
> DesignerCouncil 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
> DesignerCouncil. To set a vacation stop for delivery of
> DesignerCouncil send: SET DesignerCouncil NOMAIL
> Search previous postings at: www.ipc.org > On-Line Resources & Databases >
> E-mail 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
> --------------------------------------------------------------------------
> --
>
> -----
>
> ----------------------------------------------------------------------
> ----
> -------
>
> DesignerCouncil 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
> DesignerCouncil. To set a vacation stop for delivery of
> DesignerCouncil send: SET DesignerCouncil NOMAIL
> Search previous postings at: www.ipc.org > On-Line Resources & Databases >
> E-mail 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
> --------------------------------------------------------------------------
> -------
>
> ----------------------------------------------------------------------
> ----
> -------
> DesignerCouncil 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 DesignerCouncil.
> To set a vacation stop for delivery of DesignerCouncil send: SET
> DesignerCouncil NOMAIL
> Search previous postings at: www.ipc.org > On-Line Resources & Databases >
> E-mail 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
> --------------------------------------------------------------------------
> -------
---------------------------------------------------------------------------------
DesignerCouncil 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 DesignerCouncil. To set a vacation stop for delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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
---------------------------------------------------------------------------------
---------------------------------------------------------------------------------
DesignerCouncil 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 DesignerCouncil.
To set a vacation stop for delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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
---------------------------------------------------------------------------------
|
