Electronics Assembly Knowledge, Vision & Wisdom
Aug 15, 2019
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
Effect of Reflow Profiling on Solder Paste Flux Residues
Paper studied the effect of reflow profiling on the electrical reliability of no-clean flux residues using surface insulation resistance testing.
Production Floor
USB Connection Testing
Turning Printed Circuit Boards Into Printed Circuit Structures Using 3D Printing
Assessing the Impact of Lean on PCB Manufacturing
How To Get The Best Thermal Profile
Meter-Mix Dispensing Basics
Cleaning Process Compatibility with PCB Surface Finishes
High Reliability Alloy for Auto Apps
Dispelling Dry Storage Myths
Ask the Experts
Old Components and Blow Holes
Are old components such as resistors and circuit breakers more likely to cause blow holes during wave soldering compared to new components?
Ask the Experts
China's Narrow Path to 21st Century Dominance
China's Narrow Path to 21st Century Dominance
China is working to dominate the global system. Yet, contrary to what we are led to believe, China is poorly positioned to achieve global dominance.
Technology Briefing
Recent Technology Advances for X-ray Inspection
This paper reviews x-ray system types and what they provide for resolution, magnification, power, pixel size and the effects of radiation damage.
Analysis Lab
Circuit Material Performance for PCBs at Millimeter Wave Frequencies
Circuit Material Performance for PCBs at Millimeter Wave Frequencies
This paper gives an overview of which circuit material properties are important to mmWave frequency applications using PCBs.
Materials Tech
Vapor Degreasing Chemistries Remove Lead-Free and No-Clean Fluxes
The purpose of this paper is to present a cleaning process for difficult no-clean, lead-free and high temperature flux residues on reflowed PCBs.
Production Floor
Ask the Experts
Trichloroethylene Alternative
We are located in India and manufacture and assemble circuit boards used in watches. We are currently using a mix of Trichloroethylene and IPA for cleaning in the ratio ...
Ask the Experts
NASA DOD Phase 2: Copper Dissolution Testing
This paper describes copper dissolution measurements of two lead-free solder alloys to better define allowable rework process windows.
Analysis Lab
No-Clean Residue Shorts
No-Clean Residue Shorts
We have a PCBA with a QFN 44 using no-clean flux. We have many test failures during testing. Are the failures due to flux reside between terminations?
Board Talk
Nano Silver Replacement for High Lead Solders
Nano Silver Replacement for High Lead Solders
This paper details mechanical and reliability testing of joints made with materials under a range of temperature, pressure and atmosphere.
Materials Tech
Will AI Make Doctors Obsolete?
Will AI Make Doctors Obsolete?
Increasing amounts of health data given to machines are "reading" and taking account of the rapidly expanding scientific literature.
Technology Briefing
A Robot's Place in SMT
A Robot's Place in SMT
SMT machines today are designed to pick and place from tape, tray, and sticks. Robots can handle these more efficiently than an operator.
Production Floor
EOS Exposure of Components in the Soldering Process
Examines the consequences of electrical overstress caused by electromagnetic interference on power lines and ground in the manufacturing environment.
Analysis Lab
The Mysterious Pink Snow
The Mysterious Pink Snow
One morning after a snowstorm, the morning shift at Allied Chemical was greeted in the parking lot by pink snow. What caused this strange event?
Mysteries of Science
Cartoon
"Display the sales projections with day-glo colors and a blacklight. It will give the illusion that our future is bright."
Copyright © Randy Glasbergen