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Nov 1, 2018

Cleaning Reballed BGA Components

We currently clean reballed BGAs using an ultrasonic cleaner followed by baking to remove moisture. Is this an acceptable practice? Jim Hall and Phil Zarrow, the Assembly Brothers, offer their own suggestions.
Board Talk

Burned Chip Repair
I have a circuit board with a burned chip. Can this type of repair be done reliably? Where can I send this board to and have it done professionally?
Ask the Experts

Technical Papers

■	Using Vias to Improve PCB Density
■	Improving Quality with Automatic Solder Nozzle Tinning
■	Enabling IPX Level 7/8 PCB Waterproof Protection
■	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

How to Set Up a Successful Blind Via Hole Fill DC Plating Process
Successful via fill plating requires a specific electrolyte; the copper concentration is as high 50 - 60 g/L copper with low sulfuric acid at 30 - 60 g/L.
Production Floor

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

Reliability of No-clean and Water-soluble Solder Pastes
The purpose of this paper is to highlight the differences between these two families of solder pastes to guide users in their choice.
Analysis Lab

The Role of Organic Amines in Soldering Materials
Paper shows that tests can be developed to characterize fundamental properties of activator packages that directly impact performance.
Materials Tech

Selecting Stencil Technologies to Optimize Print Performance
Research has been done to identify individual factors in stencil performance; this paper discusses the real-world application of numerous findings.
Production Floor

Trichloroethylene Alternative
We currently use a mix of Trichloroethylene and IPA for cleaning. We are looking to eliminate the Trichloroethylene and request your input.
Ask the Experts

Grain Refinement for Improved Lead-Free Joint Reliability
In the study reported in this paper the effect of trace additions of selected elements on the grain structure of pure tin and lead-free solder alloys was observed.
Analysis Lab

Solder Paste Transfer Efficiency - What/Why
I've heard the term transfer efficiency relating to printing. What does this term refer to? What actions impact solder paste transfer efficiency?
Board Talk

Exploring the Reliability Limits for Silicone Adhesives
Paper determines "life expectancies" as well as an extrapolated estimate of the Underwriter's Laboratories' "continuous use" temperature rating.
Materials Tech

The 5G Future Is Almost Here
Investments in 5G-compatible spectrum show economic promise of 5G wireless technology, slated to be rolled out in developed economies in 2019.
Technology Briefing

Influence of Salt Residues on BGA Head in Pillow
In this paper, a series of experiments was carried over to know the influence of specifically NaCl on BGA wetting given Head in Pillow (HiP) as result.
Production Floor

Mixing Silicone and Acrylic Conformal Coatings
After repair our techs use an acrylic based conformal coat to touch-up the area. Could there be a problem if we mix silicone and acrylic conformal coatings?
Ask the Experts

Attack of the BLOB!
Joe came home from work one day to find his house covered in a mysterious foam-like blob material. What was the mysterious foam and where did it come from?
Mysteries of Science

Cartoon of the Day

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