Ross, 1. Watch your copper height from your conductors (minimal). 2. Based on past experience you cannot have 4 - 8mil lines with 10mil spacings between land patterns. The standard max. land to land spacing is 1.4mm (55mils) and the min. is 1.2mm (47mils). You decreased your X pad but not your Y pad dimension which is critical. You would need a min. of 82mils in between lands. 10mils between lands and the conductors with a 5mil soldermask dam. If you decreased your Y land anymore, you would need to watch your 1206 packages very carefully. The standard land pattern for a 1206 is outlined in IPC-782, section 8. Others may disagree. John Gulley - PE Compuroute Inc. Dallas, TX 214-340-0543 > Date: Wed, 11 Sep 96 10:37 WET DST > To: [log in to unmask] > From: [log in to unmask] (test) > Subject: spacing/design considerations for 1206 packages > I would like to konw if anyone out there has done a design using 1206 style > packages and has run four traces underneath the part. By shrinking the > standard pad in our default CAD libraries to 52 x 64 I can get four 8 mil > lines underneath the package. It works out to 10 mil spacing with 8 mil > lines. Anyone out there have problems with doing something like this? > > Thanks in advance. > > *************************************************************************** > * TechNet mail list is provided as a service by IPC using SmartList v3.05 * > *************************************************************************** > * To unsubscribe from this list at any time, send a message to: * > * [log in to unmask] with <subject: unsubscribe> and no text. * > *************************************************************************** > > *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * ***************************************************************************