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Knowledge, Vision & Wisdom Jun 30, 2015
Is There a Spacing Spec for SMD Components?
Is there a general minimum spacing requirement or should we apply SMT components to comply with the majority of the SMT pick and place systems on the market?
Board Talk
Bromine Free PWBs
What are the pros and cons of bromine in PWBs? Are bromine and lead free connected?
Ask the Experts
Ten Rules for Jumper Wires
Ten Rules for Jumper Wires
The need to attach jumper wires to circuit board assemblies is inevitable. This program covers 10 key rules for attaching jumper wires to assembled boards.
Production Floor
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The Robotic Explosion
The Robotic Explosion
Today for better or worse we're witnessing an explosion in robots. What will these robots look like and what will they do?
Technology Briefing
Analysis of Voiding Under QFN Packages
Paper covers results of experiments on QFN devices when the ensuing voiding level was calculated by x-ray inspection.
Analysis Lab
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When Precision is Not Good Enough
Papers shows that variations in pcb design cannot be accounted for by look up tables and a more complex model is required.
Materials Tech
How To Eliminate PCB Bow and Twist
How To Eliminate PCB Bow and Twist
Industry expert Bob Willis uses the NPL Defect Database to explore techniques to reduce the possibility of circuit board bow and twist.
Production Floor
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Micro Solder Balls Problem
Micro Solder Balls Problem
We're using a lead-free HASL circuit board with a SAC alloy and a RoHS reflow process using nitrogen. We are generating micro solder balls.
Ask the Experts
Investigation of Whisker Growth on Wire and Braid
This paper presents data from humidity, temperature conditioning, and electron microscopy inspection of tin coated wire specimens of various size and age.
Analysis Lab
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Are Gloves Required for PCB Handling?
Are Gloves Required for PCB Handling?
How important are gloves when handling circuit boards prior to wave soldering or reflow soldering? Phll Zarrow and Jim Hall review the topic.
Board Talk
Hot Air Solder Leveling in the Lead-free Era
Paper discusses best practice for lead-free HASL lines and the properties expected with a properly applied HASL finish.
Materials Tech
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Where to Look for Insight
Where to Look for Insight
Where can you discover the insights you need to fuel innovation? We'll explore the seven "insight-channels" that can be used by would-be innovators.
Technology Briefing
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Profiled Squeegee Blade Review
Paper presents performance of the profiled squeegee blade developed to create a multi-angle of attack for process control for all types of stencil printing processes.
Production Floor
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Cleaning PCBs of Oxidation
What is the best method for cleaning bare PCBs that have small amounts of oxidation? I know proper storage may solve the problem; what do you suggest?
Ask the Experts
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Sealed Membrane Switch Mystery
Sealed Membrane Switch Mystery
A factory was building membrane switches but all the switches from units in Denver failed. What was unusual about Denver?
Mysteries of Science
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Cartoon
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Copyright © Randy Glasbergen