We have about 5000 lead -free surface mount 8 pin Dip/so ICs with oxidation on the leads. The will be used on a tin/lead assembly. The plan it send the parts out to have them pre-tinned. We have the option of pre-tinning with lead-free or tin/lead solder. The lead-free tinning is about $1.20/part and the leaded is about $0.70. My thinking is that since we are going to use tin/lead to attach it to the PCB why spend the extra $2500 to get lead free. The vendor is pushing that since the parts where originally lead free we should pre-tin them lead free. What I'm not sure is, is ther a real reason to pre-tin the parts using lead free solder or is the vendor just trying to make more money? I then started to think, is this the best method to get oxidized parts soldererable? Is there a better way (ultasonic cleaning, etc.)? THank you in advance. Best Regards, Michael Forrester Sr. Product Engineer Siemens Healthcare Diagnostics 101 Silvermine Rd. Brookfield, CT 06804 PH: (203) 740-6452 ------------------------------------------------------------------------------- This message and any included attachments are from Siemens Healthcare Diagnostics and are intended only for the addressee(s). The information contained herein may include trade secrets or privileged or otherwise confidential information. Unauthorized review, forwarding, printing, copying, distributing, or using such information is strictly prohibited and may be unlawful. If you received this message in error, or have reason to believe you are not authorized to receive it, please promptly delete this message and notify the sender by e-mail with a copy to [log in to unmask] ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 16.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------