Electronics Assembly Knowledge, Vision & Wisdom
Dec 12, 2017
Opens With Assembled QFN Components
Opens With Assembled QFN Components
We are experiencing opens on assembled QFN components at a rate of approximately 9%. The component has two rows of pads and the failure only appears in rows near the component center. Our boards are double-side reflow and this component is mounted on the first side. What is happening?
Board Talk
What is Causing Oxidation?
After 2-3 months in the field we are noticing the silver connectors on our circuit boards have turned black, and appear to have heavy oxidation.
Ask the Experts
Revolutionary Printing Solution for SMT Assembly
Revolutionary Printing Solution for SMT Assembly
This paper presents new techniques in the screen print process with the aim of increasing solder paste transfer efficiency.
Production Floor
Wireless Infrared Networks
Wireless Infrared Networks
Researchers have developed a wireless network based on harmless infrared rays. The capacity is more than 40 Gbit/s per ray and every device gets its own ray.
Technology Briefing
Effectiveness of Conformal Coat to Prevent Corrosion of Terminals
In this study many coatings were examined for their effectiveness at preventing corrosion of nickel-palladium-gold-finished terminals.
Analysis Lab
Printable Materials for Electronic Packaging
Printable Materials for Electronic Packaging
This paper reports on novel printable materials that have the potential to surpass conventional materials.
Materials Tech
Is Cleaning Critical to POP Assemblies?
Paper addresses the cleanliness level of package-on-package assemblies including underneath package-on-package components.
Production Floor
Ask the Experts
Conformal Coating Cross Contamination
We apply 3 different types of conformal coating and cure them all in a single oven. We believe we are experiencing cross contamination.
Ask the Experts
The Quest for Reliability Standards
Many methods simulate end-use characteristics of equipment, but a clear understanding is required to differentiate between the methods.
Analysis Lab
Conductive Epoxy: Pros and Cons
Conductive Epoxy: Pros and Cons
What are the advantages and disadvantages of electrically conductive epoxies? The Assembly Brothers stick to the basics and shed some light on this question.
Board Talk
Behavior of Materials in the Manufacturing Environment
This document shows the effect of Dk and Df values from 10GHz to 20GHz and also shows their performance for lead-free assembly.
Materials Tech
The First Printed Battery
The First Printed Battery
Nanoengineers at the University of California San Diego have developed the first printed battery that is flexible, stretchable and rechargeable.
Technology Briefing
Weight Limit for Double Sided Reflow of QFNs
Study determines the maximum weight of a QFN on a circuit board by SAC305 solder surface tension when the board was upside down in a reflow oven.
Production Floor
Ask the Experts
Acceptable Conductor Repair
An operator attempted to repair damaged conductors using buss wire coated with epoxy. Is this acceptable? Is their an IPC spec for this?
Ask the Experts
The Invisible Roof Stacks
The Invisible Roof Stacks
The EPA had photos showing a new stack on the roof of a plant. Upon examination, they found nothing. What happened to the stack?
Mysteries of Science
Cartoon
"Can I write off last year's taxes as a bad investment?"
Copyright © Randy Glasbergen
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