Hello Ron, The tombstoning problems that I've encountered have been primarily with 0603 and 0402 caps/resistors. Two simple fixes I did in the past have been: 1) to shorten the center to center dimension of the component pad design. You said that you centered the component terminal on the pad leaving .025" of the pad exposed on each side of the cap. If you bring in the pads so that only .010"-.015" of the pad is exposed on each side of the cap, you should see a significant improvement. 2) Make sure both pads of the component are balanced as far as incoming trace size. Also, avoid having one pad being a part of a ground plane. This will insure even heating of both sides of the component. The above advice is assuming: 1) there are no solderability issues with the components themselves. 2) Your reflow profile is correct (i.e. your 1st zone ramp rate is less than or equal to 2 deg/min and your above liquidus between 30-60 sec). Regards, Michael Campos Process Engineer MC Assembly & Test Melbourne, FL [log in to unmask] >>> RON MOWBRAY <[log in to unmask]> 12/17/96 03:02pm >>> I would greatly appreciate any help I can get in reference to tombstoning of plastic film caps. My pad design for each terminal is .060" X .050". The .060" dimension is for width of the cap. Each terminal is centered on the .050", leaving .025" of the pad exposed on each side of the cap. We have to run the parts perpendicular to the direction of travel through the reflow because it is critical to the design. Please reply if anyone has experience with this. Thanks. *************************************************************************** * 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. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * *************************************************************************** *************************************************************************** * 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. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************