Hi Charles, A few questions for more info: 1. Do you have any input about the pad sizes? For best results, the wave-soldered pads need to be larger that what is needed for normal paste and reflow. The solder pads are sufficient in size 2. What is your conveyor speed? 3.25 fpm 3. What is your solder pot temperature? 500F 4. What is the the orientation of the long side of the SOT23's relative to the direction of travel thru the wave? What works best is if they are parallel to the direction of travel. They are parallel to the direction of travel 5. What kind of flux are you using and how is it being applied? Alpha 857 in a foam fluxer 6. Are the SOT23 parts old? Are they solderable in the first place? Appear to be because some leads solder just fine in the wave solder, can easily be touched up with soldering iron just very inefficient. The operator says that the last run of boards ran just fine. Need to check board contamination but think it is fine since other parts solder just fine. Can't place the parts on top because is a customer design and they want them on bottom. Please respond to [log in to unmask]; Please respond to [log in to unmask] To: [log in to unmask] cc: (bcc: Charles Barker/IO-US) Subject: [TN] SOT23 problems ############################################################## TechNet Mail List 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 web site (http://www.ipc.org/html/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ##############################################################