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Oct 23, 2018

Can a CTE Mismatch Cause Reliability Problems?

Does usage of BGAs, QFNs or SONs have an increased risk for reliability of solder joints due to the CTE mismatch with the base board material FR4? Jim Hall and Phil Zarrow, The Assembly Brothers, offer their own experiences.
Board Talk

Solder Paste Life on the Stencil
Our solder paste has a specified life on the stencil of 10 hours. After 10 hours of manufacturing, do we need to remove all the paste and scrap it?
Ask the Experts

Technical Papers

■	Improving Quality with Automatic Solder Nozzle Tinning
■	Enabling IPX Level 7/8 PCB Waterproof Protection
■	Say Goodbye To Stencils
■	Conformal Coatings that don't crack under pressure
■	Important Ways of Approaching Heat Management
■	PCB Prototyping for Smarties
■	Why Jobs Go On Hold
■	Case Studies Demonstrate Value-Added Services to Enable Client Success

Fine Pitch CU Pillar with Bond on Lead Assembly Challenges for High Performance Flip Chip Package
A technology featuring Copper Pillar Bond-On-Lead (BOL) with Enhanced processes delivers cost effective, high performance packaging solution.
Production Floor

New Methods Extract Lithium from Water
Researchers discovered a highly efficient way to extract lithium and other metals and minerals from water and published their findings in Science Advances.
Technology Briefing

Mixed Metals Impact on Reliability
This paper documents the effect of mixing Leaded and Lead Free alloys on BGA devices and how this impacts reliability.
Analysis Lab

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

Corrosion Resistant Servers for Free-Air Cooling Data Centers
This paper describes a corrosion resistant server design suitable for reliable operation in a free-air cooling data center.
Production Floor

Solder Paste Past Shelf Life
We have some solder paste that has been in a sealed box at 4 degree Celsius for more than 8 months. The shelf life is 6 months. Can it be used?
Ask the Experts

Help With Lead to Hole Ratio
What is the proper minimum gap between a round conductor lead and the PCB hole that will allow proper solder fill? Where can I find the recommended guideline?
Board Talk

What Causes Black Pad?
What is the primary cause of Black Pad and/or pad contamination during the assembly process?
Ask the Experts

Solder Joint Embrittlement Mechanisms, Solutions and Standards
The paper describes four case studies of solder joint embrittlement, three with Sn63Pb37 and one with SnAg3.7 solder alloy.
Materials Tech

The Portable Smartphone Laboratory
Researchers have developed a low-cost, portable laboratory on a smartphone that works nearly to detect viral and bacterial infections.
Technology Briefing

Vapor Phase - Improvement Under Oxidation Free Soldering Conditions
Modern vapor phase soldering systems based on new technologies have eliminated the disadvantages inherent to condensation systems.
Production Floor

Was It Acid Rain Itch?
Something in Jean's environment was not agreeing with her and it was causing her skin to itch. Could acid rain be the cause?
Mysteries of Science

Hybrid Conformal Coatings Used for Mitigating Whisker Growth
In this work, we have synthesized a conformal polyurethane coating consisting of hard (hexamethylene di-isocyanate) and soft (polyol) segments.
Analysis Lab

Cartoon of the Day

"For this part, I credit hard work, ingenuity and determination. The other part, I blame on gravity."
Copyright © Randy Glasbergen

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