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 ---------------------------------------------------------------------------------