Electronics Manufacturing Technical Articles

Electronics Manufacturing Technical Articles

Papers and articles related to SMT, PCB & EMS industry.


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723 SMT / PCB Technical Articles

PCB Surface Finishes: A General Review

Jun 22, 2015 | Jun Nable, Ph.D., MacDermid Inc. Waterbury, CT

Surface finishing is an integral part of any PCB fabrication. It is generally applied to exposed Cu connectors and conductors on the board. Surface finishing has numerous important functions. It serves as a protective layer for the Cu connectors during storage. The surface finish helps minimize or reduce tarnish of the Cu substrate. Additionally, since it is the layer that comes into contact with other components during assembly, it ensures good solderability between the PCB and the component during assembly. Furthermore after assembly, the finish helps prolong the integrity of the solder joint during use.

A general review of common PCB surface finishes is presented. The advantages and disadvantages of each are discussed and compared. ...

Publisher: MacDermid Inc.

MacDermid Inc.

MacDermid is a global provider of specialty chemicals for the most complex printed circuit board designs. We specialize in the areas of final finishes, through-hole metallization, and circuit formation.

Waterbury , Connecticut, USA

Antistatic, Manufacturer of Assembly Material

The Use of an Available Color Sensor for Burn-In of LED Products

Jun 18, 2015 | Tom Melly Ph.D.

In the recent past, the Light Emitting Diode (LED) was hailed as the new energy efficient light source that would never have to be replaced. There were claims of 50,000+ hrs lifetime for the humble LED. That story has changed over the last few years as the number and diversity of the LED based products has increased. This is not to say that the original evidence was incorrect, but the initial enthusiastic estimates from the labs did not match the ultimate test, customers. As a result of poor quality products affecting the overall opinion of LED based products, it is critical that manufacturers can be confident in the quality of their product. In current times we want to have products certified, checked and ensure that we have the best quality.

For the purposes of this paper we will look at one aspect of LED product, and this is the Lumen maintenance and estimated lifetime. The method described here does not seek to replace using high quality rating labs, but hopefully will allow the manufacturer to know with confidence that their prototype product, upon going to certification labs will be of a high enough quality that no expensive re-designs are required....

Publisher: Feasa Enterprises Limited

Feasa Enterprises Limited

Feasa designs and manufactures a range of LED test products.

Limerick, Ireland

Other

Solder Paste Stencil Design for Optimal QFN Yield and Reliability

Jun 11, 2015 | B. Gumpert

The use of bottom terminated components (BTC) has become widespread, specifically the use of Quad Flat No-lead (QFN) packages. The small outline and low height of this package type, improved electrical and thermal performance relative to older packaging technology, and low cost make the QFN/BTC attractive for many applications.

Over the past 15 years, the implementation of the QFN/BTC package has garnered a great amount of attention due to the assembly and inspection process challenges associated with the package. The difference in solder application parameters between the center pad and the perimeter pads complicates stencil design, and must be given special attention to balance the dissimilar requirements...

Publisher: Lockheed Martin Corporation

Lockheed Martin Corporation

Lockheed Martin is a global security and aerospace company that employs about 112,000 people worldwide and is principally engaged in the research, design, development and manufacturing of advanced technology systems.

Bethesda, Maryland, USA

Other

Tin Whisker Risk Mitigation for High-Reliability Systems Integrators and Designers

Jun 04, 2015 | David Pinsky, Elizabeth Lambert

Integrators and designers of high-reliability systems exert little or no control over component-level plating processes that affect the propensity for tin whiskering. Challenges of how to assure long-term reliability, while continuing to use COTS parts plated with pure tin, continue to arise.

An integrated, quantitative, standardized methodology is proposed whereby mitigation levels can be selected that are appropriate for specific applications of pure tin for given end-uses. A system of hardware end-use classification is proposed, together with recommended appropriate risk mitigation approaches. An updated version of the application-specific risk assessment algorithm is presented together with recommended thresholds for acceptability within the context of the hardware classifications....

Publisher: Raytheon

Raytheon

The Raytheon Company is a major American defense contractor and industrial corporation with core manufacturing concentrations in weapons and military and commercial electronics.

Waltham, Massachusetts, USA

Other

Beyond 0402M Placement: Process Considerations for 03015M Microchip Mounting

May 28, 2015 | Brent Fischthal, Sr. Marketing Manager, Products & Solutions Michael Cieslinski, Engineering Manager Panasonic Factory Solutions Company of America.

The printed circuit board assembly industry has long embraced the "Smaller, Lighter, Faster" mantra for electronic devices, especially in our ubiquitous mobile devices. As manufacturers increase smart phone functionality and capability, designers must adopt smaller components to facilitate high-density packaging. Measuring over 40% smaller than today's 0402M (0.4mmx0.2mm) microchip, the new 03015M (0.3mm×0.15mm) microchip epitomizes the bleeding-edge of surface mount component miniaturization.

This presentation will explore board and component trends, and then delve into three critical areas for successful 03015M adoption: placement equipment, assembly materials, and process controls. Beyond machine requirements, the importance of taping specifications, component shape, solder fillet, spacing gap, and stencil design are explored. We will also examine how Adaptive Process Control can increase production yields and reduce defects by placing components to solder position rather than pad. Understanding the process considerations for 03015M component mounting today will help designers and manufacturers transition to successful placement tomorrow....

Publisher: Panasonic Factory Solutions Company of America (PFSA)

Panasonic Factory Solutions Company of America (PFSA)

PFSA develops and supports innovative manufacturing automation equipment, processes and solutions around the core of electronic assembly, microelectronic, software and circuit manufacturing

Rolling Meadows, Illinois, USA

Manufacturer of Assembly Equipment, OEM, Pick and Place

“A New Paradigm in Crimping Press Design” By Rob Boyd, Senior Product Manager, Schleuniger, Inc.

May 27, 2015 | Rob Boyd, Senior Product Manager, Schleuniger. Inc.

It goes without saying that manufacturing companies want the highest possible quality at the lowest possible cost. These days, everyone is trying to do more with less in order to stay relevant in a competitive environment....

Publisher: Schleuniger, Inc.

Schleuniger, Inc.

Schleuniger, Inc. is a leading manufacturer of wire processing equipment. Our innovative automatic and semi-automatic machines are designed to cut, strip, crimp and mark all types of wire and cable.

Manchester, New Hampshire, USA

Other

Reliability of Embedded Planar Capacitors under Temperature and Voltage Stress

May 21, 2015 | Mohammed A. Alam, Michael H. Azarian, Michael Osterman and Michael Pecht

In this work the reliability of an embedded planar capacitor laminate under temperature and voltage stress is investigated. The capacitor laminate consisted of an epoxy-BaTiO3 composite sandwiched between two layers of copper. The test vehicle with the embedded capacitors was subjected to a temperature of 125oC and a voltage bias of 200 V for 1000 hours. Capacitance, dissipation factor, and insulation resistance were monitored in-situ. Failed capacitors exhibited a sharp drop in insulation resistance, indicating avalanche breakdown. The decrease in the capacitance after 1000 hours was no more than 8% for any of the devices monitored. The decrease in the capacitance was attributed to delamination in the embedded capacitor laminate and an increase in the spacing between the copper layers....

Publisher: CALCE Center for Advanced Life Cycle Engineering

CALCE Center for Advanced Life Cycle Engineering

The largest electronic products research center focused on electronics reliability, is dedicated to providing a knowledge and resource base to support the development of competitive electronic components, products and systems.

College Park, Maryland, USA

Service Provider, Training / Education

Reliability of Stacked Microvia

May 14, 2015 | Hardeep Heer, Ryan Wong

The Printed Circuit Board industry has seen a steady reduction in pitch from 1.0mm to 0.4mm; a segment of the industry is even using or considering a 0.25mm pitch. This has increased the use of stacked microvias in these designs. The process of stacking microvias has been practiced for several years in handheld devices; however, the devices generally do not operate in harsh conditions. Type 1 and Type 2 microvias have been tested over the years and have been found to be very reliable. We do not have enough test data for 3 and 4 stack microvias when placed on and off buried via. The main objective of this study was to understand the reliability of 3 and 4 stack microvias placed on and off a buried via....

Publisher: Firan Technology Group

Firan Technology Group

FTG is a leading North American manufacturer of high technology printed circuit boards and precision illuminated display systems.

Toronto, Ontario, Canada

Contract Manufacturer, Manufacturer of Assembled PCBs, Service Provider

The Long-term Shaping of the JTAG/Boundary-scan Standards

May 11, 2015 | Peter van den Eijnden, MD JTAG Technologies.

Originating from the last millenium, almost three decades ago, the introduction of surface mount packaging triggered a wave of changes throughout many aspects of electronics production. A small number of talented, innovative test engineers from various big players of the industry started to attend meetings to discuss the impact of that change of technology on their future test concepts for modern assemblies. The Joint Test Action Group was born....

Publisher: JTAG Technologies B. V.

JTAG Technologies B. V.

Market leader and technology innovator of boundary scan software and hardware products and services.

Eindhoven , Netherlands

Software Manufacturer, Test Services

Signal Transmission Loss due to Copper Surface Roughness in High-Frequency Region

Apr 30, 2015 | Elaine Liew, Mitsui Copper Foil Malaysia, Shah Alam Malaysia Taka-aki Okubo, Toshio Sudo, Shibaura Institute of Technology, Tokyo Japan Toshihiro Hosoi, Hiroaki Tsuyoshi, Fujio Kuwako, Mitsui Kinzoku Co., Ltd, Japan.

Higher-speed signal transmission is increasingly required on a printed circuit board to handle massive data in electronic systems. So, signal transmission loss of copper wiring on a printed circuit board has been studied. First, total signal loss was divided into dielectric loss and conductor loss quantitatively based on electromagnetic theory. In particular, the scattering loss due to surface roughness of copper foil has been examined in detail. And the usefulness of the copper foil with low surface roughness has been demonstrated....

Publisher: Mitsui Kinzoku Group

Mitsui Kinzoku Group

Manufacturing of functional engineered materials and electronic materials, nonferrous metal smelting, minerals resource development, precious metal recycling, raw material related businesses.

Tokyo, Japan

Other

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