Bill, As far as waving SOIC's go, I've yet to have any problems concerning heat. That goes without saying provided the IC's haven't absorbed a lot of moisture...ya' know package cracking, or "popcorn effect". IPC-SM-786A talks about the handling of moisture sensitive IC's and really focuses on the reflow aspects, but the way I look at it, heat is heat, no matter where it comes from. The -786A does acknowledge that wave soldering is a concern, but it is outside the scope of that publication...I figure if you follow the guidelines that are in there, ya' can't go wrong. Now SOT's are another story. You should look closely at the type of plastic that is being used for the body, and talk to the vendor to find out if it's okay to wave them. I'm saying this because I have ran across some SOT's every once in a while that couldn't take the kind of heat coming from the wave...they would come out kind of "blistered" looking. One last thing about SOT's and using them on the bottomside during wave. I've run across a lot of people that didn't know you could buy SOT's in different height profiles, even component distibutor rep's didn't know! They come in low, medium, and high profiles. Basically, it's how high the body sits off the board. For bottomside epoxy, ya' wanna' get low profile SOT's. That's because the height of the glue dot that you'll need to contact the bottom of the body on a high profile SOT will probably mean that you'll wind-up bleeding some of the glue on the pads because of the resulting dot diameter, and that epoxy makes good solder mask too if ya' know what I mean. __\/__ . / ^ _ \ . |\| (o)(o) |/| #------.OOOo----oo----oOOO.-----# # Steve Gregory # # [log in to unmask] # # # #________________Oooo.__________# .oooO ( ) ( ) ) / \ ( (_/ \_) *************************************************************************** * TechNet 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. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************