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December 8, 2022

Minimum Lead to Lead Spacing for Wave Soldered Through-Hole Components

What is the recommended minimum lead-to-lead spacing for through-hole components run through a wave soldering system? Would the spacing be different for lead-free solder compared to leaded solder? Jim Hall and Phil Zarrow, The Assembly Brothers, discuss these questions.
Board Talk

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

Technical Papers

■	Master Advanced Packaging Inspection
■	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

Reliability of Automated Soldering vs. Hand Soldering
On occasion, we have had to place a skip in our SMT placement machine due to unavailability of a surface mount component. The intention is to build the circuit ...
Ask the Experts

Bifunctional Polymer Allows Strength and Speed in Artificial Muscles
Strength and speed could not be achieved simultaneously because increasing muscle strength slows speed reduces the strength, until now.
Technology Briefing

Copper-Tin Intermetallics: Their Importance, Growth Rate and Nature
This paper will review the formation of copper-tin intermetallics, their growth rate, their effect on thermal cycle life, and drop shock performance.
Analysis Lab

New-Generation, Low-Temperature Lead-Free Solder for SMT Assembly
The roles of additive and bismuth content will be discussed. Eutectic SnBi and three newly designed SnBi-based alloys were experimented upon.
Materials Tech

Selective Reflow Rework Process
This paper discusses some aspects of the process optimization and changes made to improve the quality of the rework process.
Production Floor

How to Re-qualify BGA Spheres
What procedure would you recommend to "re-qualify" a lot of BGA spheres. We keep our spheres in a nitrogen cabinet, so I doubt that they would have degraded past the point ...
Ask the Experts

A Case Study of Nickel Dendritic Growth on Printed Circuit Boards
This paper is a case study of nickel dendritic growth under moisture condensation condition on freshly produced circuit boards contaminated with sulfuric acid etchant.
Analysis Lab

Moisture Barrier Bag Issues
Moisture sensitive chip components have been exposed to the atmosphere beyond specification. Can they be packaged and sealed with desiccant?
Board Talk

Atomristors: Non-Volatile Resistance Switching in 2D Monolayers
Researchers discovered the first two-dimensional material, graphene, which consists of only a single layer of atoms13.
Materials Tech

Supplier Spotlight

ECI Technology, Inc.
ECI Technology is the leading provider of Chemical Management Systems ...

ALL Circuits
ALL Circuits is France's largest EMS with manufacturing facilities in ...

Circuit Check Inc.
When time to design and deliver is critical, we have ...

Corelis, Inc.
Corelis offers bus analysis, embedded test solutions, and the industry’s ...

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Portable Desalination Unit Addresses Drinking Water Shortage
Researchers have developed a portable desalination unit that generates clean drinking water without the need for filters or high-pressure pumps.
Technology Briefing

Protecting the Reliability and Integrity of Electronic Products and Assemblies when Disinfecting for SARS-CoV-2
This paper offers guidance for protecting the integrity of electronic products and assemblies when disinfecting equipment surfaces for SARS-CoV-2 virus.
Production Floor

Crack Propagation Mechanism Study on Bismuth Contained Base Lead Free Solder
The thermal cycling reliability characteristics of solder containing a small amount of Bismuth which is below 4wt% in accordance with the new requirements were investigated.
Analysis Lab

Lightning Stikes in the Chemistry Lab
As a lightning bolt hit near a lab, a blue spark jumped from a radio in the lab room to a student. Was the spark lightning?
Mysteries of Science

Cartoon of the Day

"I suffer from corporate insomnia. I have trouble falling asleep during dull business presentations."
Copyright © Randy Glasbergen

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