-
- News
- Books
Featured Books
- smt007 Magazine
Latest Issues
Current IssueBox Build
One trend is to add box build and final assembly to your product offering. In this issue, we explore the opportunities and risks of adding system assembly to your service portfolio.
IPC APEX EXPO 2024 Pre-show
This month’s issue devotes its pages to a comprehensive preview of the IPC APEX EXPO 2024 event. Whether your role is technical or business, if you're new-to-the-industry or seasoned veteran, you'll find value throughout this program.
Boost Your Sales
Every part of your business can be evaluated as a process, including your sales funnel. Optimizing your selling process requires a coordinated effort between marketing and sales. In this issue, industry experts in marketing and sales offer their best advice on how to boost your sales efforts.
- Articles
- Columns
Search Console
- Links
- Events
||| MENU - smt007 Magazine
Cleaning and Inspection
June 4, 2021 | Graham Naisbitt, Gen3 SystemsEstimated reading time: 1 minute
Determining acceptable cleanliness demands significantly more investigation than has historically been the case. Until recently, the industry has been too reliant on the use of a “cleanliness” level of2NaCl equivalence. That has been removed from the venerable IPC-J-STD-001 now in Revision H.
With increasing packaging density, coupled with hostile operating conditions, the incidence of circuit failure has increased. Such failures are, most likely, the result of adverse electrochemical migration. Dendrites are the result.
Today’s non-negotiable requirement is to produce objective evidence. The two tools that have been proven to be up to the task, are SIR followed by PICT. What can also be seen is the plethora of issues that must be addressed.
For far too many years, the industry had been using the term “cleanliness,” which was particularly unsuitable because:
- Cleanliness assumes you have tested all possible contaminants on the board. You can’t do this.
- Process control assumes you are removing the same contaminants every time. You can do this reliably and reproducibly.
As explained in the new IPC WP019B, the requirement is to use SIR. This technique measures changes to insulation resistance by examining a representative example of the intended end-product from an electro-chemical standpoint.
To read this entire article, which appeared in the June 2021 issue of SMT007 Magazine, click here.