Claude, if I understood your question properly on fine pitch packages you are better off not using solder mask and also try to offset the paste mask by .005"" towards the outside of component placement. Shahed Safavi-Bayat, C.I.D. Cad Designer 1035 Greenwood Blv. Suite 173 Lake Mary Fl 32746 mailto: [log in to unmask] Tel : (407)829-4440 ext.216 Fax : (407)829-2213 -----Original Message----- From: Claude Tremblay [mailto:[log in to unmask]] Sent: Wednesday, August 29, 2001 4:56 PM To: [log in to unmask] Subject: [TN] HASL Hi I have a question about HASL. Is there any standard or specs about SMT land to land height variation? We received some PCB with poor HASL coplanarity and I suspect that it is the reason for my problems (shorts and open joints) on my 0.5mm fine pitch. Can you provide me with some info? Regards Claude Tremblay Process Engineering Supervisor C-MAC Laval Electronic System Division 2185 Michelin, Laval, H7L 4S2 Quebec, Canada Tel: 450-978-5000 ext. 3335 Fax: 450-978-3237 E-mail: [log in to unmask] ---------------------------------------------------------------------------- ----- Technet 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 Technet To temporarily halt delivery of Technet send the following message: SET Technet 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 ---------------------------------------------------------------------------- ----- --------------------------------------------------------------------------------- Technet 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 Technet To temporarily halt delivery of Technet send the following message: SET Technet 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 ---------------------------------------------------------------------------------