Joe- Is the nature of the damage physical (e.g., dislocations/twinning) or is it parametric? When will Dr. Haba have his papaer out & in what venue? > ********************************* > Bill Davis, Ph.D. > Diamond Multimedia Systems > Senior Scientist > Tel. 408.325.7868 > Cell. 408.888.5650 > e-mail: [log in to unmask] > ******************************** > > > > -----Original Message----- > From: Joseph Fjelstad [SMTP:[log in to unmask]] > Sent: Friday, August 07, 1998 4:09 PM > To: [log in to unmask] > Subject: [TN] Laser marking of die concern > > For those interested, one of our staff scientists has noted that > failures > can be induced by marking the back side of die with appears to be a > laser > of the wrong wavelength. One of the most common wave lengths presently > used > is also one that transmits the greatest amount of energy though the > die > with a high potential for damaging the active circuitry on the > opposing > side. This is due to silicon's near transparency to the given wave > length > (1064nm). The study was done by Dr. Belgacem Haba. While the study > will be > part of a forthcoming technical article, we thought it could be of > significance to those presently involved in packaging and marking IC's > and > to give the industry and early "heads up". If you have interest or > need for > more detail, please contact either me or Dr. Haba direct at > [log in to unmask] > > Regards to all, > J. Fjelstad > > ################################################################ > TechNet 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 TechNet <your full name> > To unsubscribe: SIGNOFF TechNet > ################################################################ > Please visit IPC's web site (http://www.ipc.org) "On-Line Services" > section for additional information. > For technical support contact Hugo Scaramuzza at [log in to unmask] or > 847-509-9700 ext.312 > ################################################################ > ################################################################ TechNet 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 TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################