In a message dated 06/10/99 9:28:41, [log in to unmask] writes: > Can anyone tell me what the minimum tin/lead plating thickness should > be inside a plated through hole? Hi David, You did not say whether you are talking about PTHs or PTVs (vias). For PTVs, there is no need for any tin/lead plating. For PTHs, into which you want to solder component leads, the tin/lead plating thickness will provide some protection to preserve the solderability of the underlying copper, but you need to consider that tin/lead plating is porous, and thus not very good at this job. Thus, tin/lead plating typically is reflowed. To get good solderability shelf life you need about 5 micro-meters of solder; on the other hand, there is no critical need for having good solderability inside a PTH barrel. Thus, there is no industry standard on this Werner Engelmaier Engelmaier Associates, L.C. Electronic Packaging, Interconnection and Reliability Consulting 7 Jasmine Run Ormond Beach, FL 32174 USA Phone: 904-437-8747, Fax: 904-437-8737 E-mail: [log in to unmask], Website: www.engelmaier.com ################################################################ 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 ################################################################ ################################################################ 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 ################################################################