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November 3, 2022

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? The Assembly Brothers, Phil Zarrow and Jim Hall, answer this question and share their own experiences.
Board Talk

Electroplating of Cu in TSV
The research objective is to estimate metallurgical and mechanical properties of low alpha solder. Cu-filling property to TSV was also investigated.
Production Floor

Technical Papers

■	X-Ray Supports Quality Assurance, Counterfeit Detection
■	Be Selective in Partnering with a Soldering Equipment Supplier
■	Effects of Long-Term Storage on Mechanical and Electrical Integrity
■	Selective Equipment in Spec?
■	Why the need for 3D SPI?
■	Dealing with the Results of the Pandemic
■	Direct Immersion Gold as a Final Finish
■	Essential Practices for Gold Mitigation of Electronic Components
■	Nearshoring or Contract Manufacturing? Which Fits Your Business Model?
■	Solder Alloy Contribution to Robust Selective Soldering Process

Solder Paste Life on the Stencil
Our solder paste has a specified life for exposure on the stencil at 10 hours. We run our stencil operation continuously for 40 hours, adding 250g of new paste ...
Ask the Experts

Diodes As One Way Regulator Valves
Diodes are in nearly every electronic device, acting as one-way regulator valves. Diodes allow electricity to flow in only one direction through the device.
Technology Briefing

Effect of TIM Compression Loads on BGA Reliability
This work aims to provide guidance for the potential trade-offs between thermal performances and second level interconnect reliability.
Analysis Lab

$High and Matched Refractive Index Liquid Adhesives for Optical Device$

High and Matched Refractive Index Liquid Adhesives for Optical Device
High and matched refractive index liquid adhesives are required in several electronics devices, where the liquid adhesives are in the optical pathway.
Materials Tech

Stencil Printing Yield Improvements
In this paper two methods were studied to improve solder paste release. A nano-scale hydrophobic, oleophobic and adhesion promoting coating.
Production Floor

ESD and Humidification
In the handling of circuit board assemblies placing them into systems, is ambient air humidification necessary if other means of protection are enforced including ESD ...
Ask the Experts

Heterogeneous Integration Roadmap: Technology for Systems of the Future
The new Heterogeneous Integration Roadmap provides a long-term vision for the electronics industry, identifying future challenges and potential solutions.
Analysis Lab

How To Strip Tin-Lead Solder From SMT Pads for RoHS
Is it possible to scrub the pads of a PCB to bring it back into compliance? 63-37 solder was mistakenly used to hand solder parts.
Board Talk

Embedded Fibers Enhance Nano-Scale Interconnections
This paper introduces the use of embedded fibers in the interconnections of chip-to-chip and chip-to-package components.
Materials Tech

Supplier Spotlight

Lockheed Martin
As a global security and aerospace company, the majority of ...

Marvin Test Solutions
Marvin Test Solutions, a vertically-integrated aerospace test and measurement company, ...

S-Cubed (Service Support Specialties, Inc.)
Over a 20 year period, our solutions to semiconductor lithography ...

Ametherm
Ametherm, headquartered in Carson City, Nev., was founded in 1994 ...

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Mastering Innovation's Toughest Trade-Offs
Innovation in dynamic environments is rife with critical tensions. When left unaddressed or mishandled, these tensions sink teams and organizations.
Technology Briefing

Characterization, Prevention and Removal of Particulate Matter on PCBs
This paper describes a means of measuring the DRH of minute quantities of particulate matter (1 mg or less) found on PCBs.
Production Floor

Component Density on Solder Joint Reliability Under Harsh Environment
In this study, degradation behavior of lead free solder joint was compared with mounted position and component density of vehicle engine control unit for excavator.
Analysis Lab

Mysterious Drop In Production Yield
A factory manufactured membrane switches. After installing exhaust fans the yield dropped. What was causing this decrease in production?
Mysteries of Science

Cartoon of the Day

"I'm learning how to relax, doctor, but I want to relax better and faster! I want to be on the cutting edge of relaxation!"
Copyright © Randy Glasbergen

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