On tight designs, we allow small discretes to be as close as .050 inches. Everything else stays outside the .150 inch keepout zone. The discretes are removed prior to BGA rework. > Larry Jindra > TRW/Avionics Systems Division > mailto:[log in to unmask] ph (858) 592-3424 fax (858) 592-3606 -----Original Message----- From: Kuczynski, Michael @ SPACENAV [mailto:[log in to unmask]] Sent: Friday, October 27, 2000 6:39 AM To: [log in to unmask] Subject: [TN] BGA/caps placement I'd like some opinions on capacitor placement for BGAs. Where are you placing the filter caps; top or bottom (we're using 0508 and 0603) If on the top, how far away are you placing them. (we're using a .150 keepout for rework) and are they helping What problems do the rework guys have with the caps on the bottom Any insights/thoughts on this subject would be appreciated There seems little, middle ground on this issue for engineering and mfg. Michael Kuczynski Librarian/Sr. Designer L3 Communications 1-201-393-2122 (Ph) Space & Navigation 1-201-393-6681 (Fax) 699 Rt. 46 E Mail Stop PL1/J8 Teterboro,NJ 07680 [log in to unmask] --------------------------------------------------------------------------------- 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 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 --------------------------------------------------------------------------------- --------------------------------------------------------------------------------- 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 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 ---------------------------------------------------------------------------------