Electronics Forum | Fri Sep 10 00:13:48 EDT 2004 | Darren
Joe If you are building these yourself your engineering group should be able to answer your questions, if you will be using a CM they will usually have a basic DFM report which they will gladly give to you as it will make their job much easier if yo
Electronics Forum | Tue Dec 03 10:02:30 EST 2019 | dwl
This is a perfectly appropriate question for this forum. Looking at the pics, the solder joints look fine to me. can you circle the questionable joint? Maybe I'm just not seeing it. In general its fine to reflow a questionable solder joint to troub
Industry News | 2020-09-01 12:20:14.0
MIRTEC today announced its participation in the SMTA International Virtual Conference & Expo. The Live Virtual Exposition is scheduled to take place Sept. 28-30, 2020.
Industry News | 2021-02-08 15:18:29.0
MIRTEC is pleased to announce its participation in the 2021 IPC APEX Virtual EXPO, scheduled to take place March 9-11, 2021 online at www.ipcapexexpo.org.
Technical Library | 2019-09-19 00:28:48.0
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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