Subject: Electro-migration 000Importance: normal 200MCB-options: NNYNANAYA 220MCB-type: 0 200o-nw-formtype: n, w 200o-nw-body: 1, 1 I have been running a slightly modified version of the IPC-TM-650 2.6.13 test for dendritic growth. The pattern has a .010" space between conductors and I am using .3 volts per mil of space (3.0 volts) with the current limited to 100 mA. (These parameters were suggested by a customer). The DI water I am using has a conductance of 0.8 micro-mhos/cm. I have performed this test on samples at different stages of production and get the same results. Samples were taken: 1) Finished product (HASL & OSP) 2) Print & Etch only 3) 5 different laminate suppliers - copper clad no processing 4) Finished product "cleaned" in our ionic contamiantion unit (75% isopropyl) 5) Finished product soaked in acetonitrile (sp?) for 8 hours So far everything I have tested exhibits dendritic growth resulting in a current draw in excess of 300 uA in @ about 1 minute. I also get the same results with copper tape and copper foil on a glass slide. Are these results typical? Will dendrites form even with very low levels of ionic contamination using this test? Is there any correlation between this test and ionic contamination and/or SIR tests? The samples all passed ionic contamination testing (<1.0 ug/in2) and SIR testing (> 1.0E11). Samples were also tested using ion chromatography - bare copper samples showed < 1.0 ug/in2 for chloride, bromide, and sulfate. Solder coated samples were 1.5 ug/in2 for chloride, 22.0 ug/in2 for bromide, and .1 ug/in2 for sulfate. ################################################################ 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 ################################################################