ASSUMING YOU ARE GOING TO USE A BED OF NAILS TEST FIXTURE. 1. EACH NODE NEEDS TO BE AVAILABLE ON THE SOLDER SIDE. A GRID OF NO LESS THAN .05". 2. ALLOW ROOM FOR EACH PIN ON THE COMPONENT SIDE TO HAVE AT LEAST ONE MICRO VIA. I LIKE TO USE .03 PADS AND .02 DRILL. GOOD LUCK JOHN COY PLEXUS -----Original Message----- From: Matthew Lamkin [mailto:[log in to unmask]] Sent: Monday, March 12, 2001 12:21 AM To: [log in to unmask] Subject: [DC] Tips wanted for my first multilayer board? Hello everyone, At last, my employer has decided that on my next board I can go past the normal 2 layer restriction that I normally have. (I've been waiting for this for years!) The board will have amongst its components a MQFP208, and be a very tight fit given the number of components on it and where it is to fit (but then theyre all like that ar'nt they!). Anyhow, the boss is letting me have... wait for it... 4 layers to use. Now this may not be in the same league as all you guys doing 12-16 layers etc, but I gotta start somewhere. Where do I start? Ok say I got the SMT components all placed on one side, are there any suggestions or tips that you multilayer experts can give me for designing with 4 layers? I've got funny feeling that I cannot get a power/groundplane on the inside. I've been advised to steer clear of blind via's and have them all the way through. Are there any websites with multi layer info on? Cheers - Matthew Lamkin. ---------------------------------------------------------------------------- ----- DesignerCouncil 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 DesignerCouncil. To set a vacation stop for delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL 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 ---------------------------------------------------------------------------- -----