Guys, We are designing a very very small board (for component replacement). As the board will be having a components on topside only, we can use the bottom side to make a connection with the main board. Currently the main board has many small square pads in perimeter. I am exploring the two ways of connecting both boards. First one, connect the small board by having mirror pads on the bottom side to that of the main board. Or by having a slit (long pads along perimeter) on the component board and have the main board as it is with small pads in perimeter. I do not want to modify my main board. Should I go for butt joint connection through mirror pad design or long connection knowing that there will be no connection where there is a soldermask on the main board. Any suggestion from manufacturing and reliability point of view. I hope, I haven't confuse anyone. re, Ken Patel ______________________________________________________ Ken Patel Phone: (408) 490-6804 1708 McCarthy Blvd. Fax: (408) 490-6859 Milpitas, CA 95035 Beeper: (888) 769-1808 ################################################################ 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 ################################################################