Electronics Assembly Knowledge, Vision & Wisdom
May 17, 2018
Max Interval Between Reflow for OSP Boards
Max Interval Between Reflow for OSP Boards
With OSP coated circuit boards, what is the maximum allowable and recommend time interval between reflow of the first and second sides to insure proper wetting. The Assembly Brothers, Jim Hall and Phil Zarrow, discuss this.
Board Talk
How Many Fiducials Pre Solder Paste Stencil?
We manufacture solder paste stencils for a variety of customers. We have seen as many as 180 fiducials per stencil with a step and repeat. Is this excessive?
Ask the Experts
When Machine Vision Inspection Comes Up Short: Is 'Almost' Defect-Free Enough?
Enhancing the Quality of Your Selective Soldering Process
An Electroless Nickel/Immersion Gold (ENIG) Surface Finish for Better Reliability of Assemblies
Ten Ways to Find Counterfeit Components Using X-Ray
Where No Machine Has Gone Before: Automated Assembly Verification
PCB Design for Smarties
How to Pick a PCB Assembly Partner
Best Practices for Optimizing Your Selective Soldering Process
Early Design Review of Boundary Scan To Enhancing Testability
Early Design Review of Boundary Scan To Enhancing Testability
Paper reviews what portions of a design can be covered structurally and what are covered functionally, to provide the best diagnostics to discover faults?
Production Floor
The Era of Quantum Computing Microprocessors Dawns
The Era of Quantum Computing Microprocessors Dawns
Research teams all over the world have been exploring different ways to design a working computer that can integrate quantum interactions.
Technology Briefing
Effects of Substrate Material and Package Pad Design on Solder-Joint Reliabilty
This paper describes work to improve the solder-joint reliability (SJR) of a 0.8mm pitch, 25mm body BGA package used in automotive under-the-hood applications.
Analysis Lab
Improved Reliability of Jet Dispensable Polymeric Coating Material
Improved Reliability of Jet Dispensable Polymeric Coating Material
The study compares a paste that barely passes SIR at 85C/85RH with polymeric coating material, Silicone conformal coating, and acrylic conformal coating.
Materials Tech
Electroplated Copper Filling of Through Holes
This paper discusses a through hole copper filling process for applications of high density interconnects and IC substrates.
Production Floor
Ask the Experts
Conformal Coating Press Fit Connectors
We are having problems with press-fit connectors. We produce military circuit board assemblies and currently use a single component, acrylic conformal coating.
Ask the Experts
Corrosion and Contaminant Diffusion Multi-Physics Model
Models for copper interconnect degradation are needed for life prediction modeling to ensure 10-year, 100,000 mile reliability for automotive applications.
Analysis Lab
How Many Fiducials Per Stencil
How Many Fiducials Per Stencil
We have seen as many as 180 fiducials per stencil with a step and repeat. How many fiducials are recommended for a solder paste stencil?
Board Talk
Rosin vs. Non-Rosin Wave Flux? - More Reliable Electronic Assemblies
This paper focuses on the surface insulation resistance (SIR) differences between rosin-containing and rosin-free flux formulations.
Materials Tech
Addressing the Counterfeit Goods Crisis
Addressing the Counterfeit Goods Crisis
A new report titled The Economic Impacts of Counterfeiting, estimates that by 2022, the global economic value of counterfeiting could reach US$2.8 trillion.
Technology Briefing
Effect of Process Changes and Flux on Mid-Chip Solder Balling
Paper documents experimental work performed to understand the impact on mid-chip solder balling from the manufacturing process and flux chemistry.
Production Floor
Ask the Experts
Rise of Bismuth Levels in our Solder Pots
We have an issue of concentrating bismuth in our selective solder machines. Where could the bismuth be coming from?
Ask the Experts
The Static Charge Overload
The Static Charge Overload
A plastic molding plant had been running for less than a year. Suddenly parts began testing positive for an electrical charge. What caused it?
Mysteries of Science
Cartoon
"If you wait long enough, difficult people either quit, retire or die. That's my management style."
Copyright © Randy Glasbergen