To All - I am currently working on the design of a PWB that must continuously function (read as IPC-D-275 class 3) at ambient temperatures as high as 105 degrees C. I am seeking input as to design criteria for this environment. The items I have already identified include: 200 degree C Tg FR-4/Gtek base material Conformal leaded parts where ever available No fine line / fine pitch design Teardrop at all drilled pads including vias My primary question is should we be using a "NO LEAD" finish and solder for these boards? Is there any thing I have overlooked? TIA Jeffrey McGlaughlin [log in to unmask] Battelle Memorial Institute Columbus Ohio ################################################################ DesignerCouncil E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE DesignerCouncil <your full name> To unsubscribe: SIGNOFF DesignerCouncil ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################