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How Detrimental Production Concerns Related to Solder Mask Residues Can Be Countered by Simple Operational Adaptations

Published:

September 19, 2019

Author:

Rick Nichols, Sandra Heinemann, Gustavo Ramos, Dr. Lars Nothdurft, Hubertus Mertens

Abstract:

The symbiotic relationship between solder masks and selective finishes is not new. The soldermask application is one of the key considerations to ensure a successful application of a selective finish. The selective finish is the final chemical step of the PCB manufacturing process, this is when the panels are at their most valuable and are unfortunately not re-workable. Imperfections are not tolerated, even if they are wholly cosmetic. Quality issues often manifest themselves in the form of a 'ping pong' conversation between the fabricators, the soldermask suppliers and the selective finish suppliers. Without tangible evidence these discussions are difficult to resolve and the selective finish process is usually regarded as responsible.

This paper will focus on the chemical characteristics and use them to predict or identify potential issues before they occur rather than specifically name 'critical' soldermasks. It is also the intention of this paper to address the potential of a soldermask to react to common yield hiking practices like UV bumping and oven curing. It is hoped that this awareness will help fabricators to ensure maximum yields by asking the right questions. 'Critical’ soldermasks impact all selective finishes. In this paper, practical experience using immersion tin will be used to highlight the relationship between 'critical' soldermasks and some of the issues seen in the field. The paper will include a novel approach to identify re-deposited volatiles after the reflow....

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Company Information:

Atotech

One of the world's leading suppliers of integrated production systems, chemistry, equipment, know-how and service for electroplating, semiconductor and printed circuit board manufacturing.

Berlin, Germany

Components/Substrates, Manufacturer of Assembly Material, Manufacturer of Components

  • Phone (+49) 30-349 85-0
  • Fax (+49) 30-349 85-777

Atotech website

Company Postings:

(2) products in the catalog

(9) technical library articles

(1) news release

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