Stats: We DO direct connection of vias to plane layers. ambient working temperature: Nothing harsh, normal temp, normal altitude, but one project I worked on was using up to 100 degrees (F) temp range, and siesmic acceptability. humidity: Normal, nothing strange. how many layers: Up to 14 layers, controlled impedance, 50, 75 and 100 ohms. Board thickness: up to .125 inch Via size(s): .015 or .018 inch, dependant on board size Board size(s): ~ 4" SQ. to 15.5"x26.0" (last board I designed) Largest board/smallest via size: The last board I did was surface mount, 15.5 by 26.0 inches, using a .013 via (.030 outer pad,.033 inner pad diameter, per the fabrication house guidelines), also using vias into SMT pads (discrete comp- onents ONLY), and the board is being fully hand assembled! ~ 3400 components, 7900 vias! Do not do this without verifing with your fab house that they will be able to make your board. Typical board speeds: 100Mhz to 2.4 Ghz Typical board material: FR-4, 170 Tg or better. We will go to GETEK shortly! Hope this helps. Sincerely, Mitch Morey Sr. PCB Designer TRW, Inc. Redondo Beach, CA 90278 Phone: (310)814-5765 Fax: (310)812-4949 EMAIL: [log in to unmask] ||||| ((o o)) ____________________________oOO_(_)_OOo_____________________________ PCB layout is like fine art. You have to DIE to be famous! ____________________________________________________________________ (_) (_) **************************************************************************** * The 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. * ****************************************************************************