Good day Technet,
May I pose a question of screen thickness in regards to a surface mount fine pitch part.  I have a surface mount PCA that is using a 100 pin, 20 mil.  spacing TQFP.   What is the ideal thickness of the screen I should specify that is not going to put down too much solder paste, thereby preventing bridging between pads?   Also, I have been reading a lot on this forum about immersion white tin.   It sounds as though many of you feel this is a good finish to use with fine pitch parts.   Normally I use gold flash, but this sounds as good or better if the cost is not higher.   Where can I find these archives at www.IPC.org so that I may review the consensus?  I searched the site but could not find any link to archives.
Thank You,
Tom Burek
[log in to unmask]

################################################################
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
################################################################