Electronics Assembly Knowledge, Vision & Wisdom
Nanotechnology for Lead-free Final Finishes
Nanotechnology for Lead-free Final Finishes
Paper describes use of organic metal finish deposited onto copper pads to provide protection against oxidation and preserve solderability.
Materials Tech

Authored By:
Jim Kenny, B. Wessling, Karl Wengenroth
Joe Abys, John Fudala, Robert Farrell
Enthone, West Haven, CT USA
,{url:'http://www.circuitinsight.com/videos/nanotech_lead_free_finish.mp4'},{url:'http://www.circuitinsight.com/videos/programs_final.mp4'}], clip:{autoBuffering:true, autoPlay:true, scaling:'scale' } }).ipad();
Summary
The use of an Organic Metal finish only a few nano-meters deposited onto copper pads of printed circuit boards provides effective protection against oxidation and preserves solderability. The Nano layer has a thickness of only 50 nm, and contains the Organic Metal (conductive polymer) and a small amount of silver. Being more then 90% (by volume), Organic Metal is the major component of the deposited layer; Ag is present equivalent to a thickness of 4 nm. This Organic Metal - Ag complex final finish performs as well as any of the established surface finishes with a significant reduction in energy and environmental impact
Conclusions
The Organic Metal based Nanofinish is the first described example of a nanoparticulate complex between an Organic Metal and Ag. Although it does not form a closed nanolayer, it completely and effectively protects the Cu and prevents it from being oxidized even after four lead free reflow steps. Its aging resistance and wetting (soldering) performance is excellent and equal to or better than other well-established metallic finishes. This finish should be considered by anyone currently struggling with the cost and soldering inconsistencies of ENIG or attempting to use OSP on demanding multilayer PCBs
Initially Published in the IPC Proceedings
Submit A Comment

Comments are reviewed prior to posting. Please avoid discussion of pricing or recommendations for specific products. You must include your full name to have your comments posted. We will not post your email address.

Your Name


Company


E-mail


Country


Comments





Related Programs
bullet What Are the Benefits and Drawbacks of OSP Finish?
bullet Insulation Resistance of Dielectric Materials
bullet The Effect of Radiation Losses on High Frequency PCB Performance
bullet Board Performance after Pb-Free Reflow
bullet Emerging Substrate Technologies
bullet Reliability Performance of Very Thin Boards
bullet Via Filling: Challenges in the Plating Process
bullet The Perfect Copper Surface
bullet Toughened Laminates for Circuit Boards
bullet Plasma Polymerization
More Related Programs
About | Advertising | Contact | Directory | Directory Search | Directory Submit | Privacy | Programs | Program Search | Sponsorship | Subscribe | Terms

Circuit Insight
6 Liberty Square #2040, Boston MA 02109 USA

Jeff Ferry, Publisher | Ken Cavallaro, Editor/Business Manager

Copyright © Circuitnet LLC. All rights reserved.
A Circuitnet Media Publication