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November 22, 2022

What is Considered Acceptable PCB Rework and Repair?

An operator attempted to repair three damaged conductors using bus wire overcoated with epoxy. Do you consider this repair acceptable? Is there an IPC spec we should follow? Jim Hall and Phil Zarrow, The Assembly Brothers, address this question.
Board Talk

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

Technical Papers

■	Keys to Component Lead Tinning Success
■	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?

Initial Screen Print Test Board
Is it recommended to print one cycle before printing the first production board? I could use a scrap board or blank plastic card for the first print.
Ask the Experts

Microchips Could Be Used to Activate Excess Dopants
As microchips continue to shrink, silicon must be doped, or mixed, with higher concentrations of phosphorus to produce the desired current.
Technology Briefing

Cross-Sectioning of SMT and PCB Related Architectures
Techniques in performing precision and analytical micro-sections, which fuse the techniques common in preparation of silicon wafers and bulk materials are discussed.
Analysis Lab

Digitally Printed Battery Design
Battery operated devices have grown smaller while energy demands have increased. This paper provides a review of battery construction.
Materials Tech

Void-Free Soldering with a New Vapor-Phase with Vacuum Technology
Equipment has been developed to achieve void-free joints under these conditions utilizing modern condensation reflow technology.
Production Floor

Stencil Pattern for Thermal Pads on QFNs
We need more information regarding the stencil pattern for thermal pads on QFNs. We know why it is important to "mesh" but need more info regarding what is best ...
Ask the Experts

Electrochemical Reliability as a Function of Component Standoff
The purpose of this paper is to research the activity of flux residues as a function of the standoff height using insulation resistance.
Analysis Lab

Why Uneven Conformal Coating?
We are experiencing an issue with our conformal coating. On matte finish boards the coating is vibrating away from some others and building up in others.
Board Talk

Lead-Free Alloys with Ultra-High Thermo-Mechanical Reliability
Alpha focused on improving the properties of the bulk solder as well as controlled growth of interfacial IMCs and alloy microstructure.
Materials Tech

Supplier Spotlight

Pemtron
Based on 3D precision measurement and vision source technology, PEMTRON ...

Fabrinet
We specialize in precision optical, electro-optical, sophisticated electronic PCBA and ...

Barry Industries
Barry Industries is the leading manufacturer of passive resistive components ...

Novatec SA
In the electronics assembly industry where sophistication and complexity reign, ...

FULL SUPPLIER DIRECTORY

Chip-Based Optical Phased Arrays for Steering Laser Beams in Lidar
Devices known as chip-based optical phased arrays can quickly and precisely steer light in a non-mechanical way for lidar systems.
Technology Briefing

Industry 4.0 for Inspection in the Electronics Industry
This paper investigates how the connected at-line x-ray system can improve production yield and lower costs when connected to the production line.
Production Floor

Risk for Ceramic Component Cracking Dependent
The paper discusses the differences of the alloy, based stress in ceramic components due to passive cycle tests, real customer tests, and stress analyses.
Analysis Lab

Pay Clerk Production Woes
A company was having quality control problems. Friday morning was when the problems happened, but why just on Fridays?
Mysteries of Science

Cartoon of the Day

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