Electronics Manufacturing Technical Articles

Electronics Manufacturing Technical Articles

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


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  • Reflow Ovens
  • Precision, fluid dispensing systems for low volume, high mix, R&D, and high volume 24x7 production
  • Soldering Robots
  • Electronics manufacturing training materials - IPC, solder
  • PCB X-Ray Inspection
  • PCB Rework Tools
750 SMT / PCB Technical Articles

A Room Temperature Stable and Jetable Solder Joint Encapsulant Adhesive - Capillary Underfill Replacement

Jan 12, 2016 | Dr. Mary Liu and Dr. Wusheng Yin

With the increasing demand of device miniaturization, high speed, more memory, more function, low cost, and more flexibility in device design and manufacturing chain, YINCAE has published a white paper on a first individual solder joint encapsulant which can eliminate underfilling process with at least five times solder joint increase and provide more flexibility for fine pitch and high density application. In order to meet the demand of manufacturing of high speed and low cost, YINCAE has invented a room temperature stable and jettable solder joint encapsulant adhesive – SMT 266. The invention of SMT 266 has allowed our customers to have more flexibility in their high-speed production line such as worry free on the work life of adhesive and workable jetting process....

Publisher: YINCAE Advanced Materials, LLC.

YINCAE Advanced Materials, LLC.

Yincae Advanced Materials, LLC is a developer, manufacturer, and supplier of high performance coatings, adhesives, electronic and optoelectronic materials.

Albany, New York, USA

Components/Substrates, Contract Manufacturer, Manufacturer of Assembly Material

A Low Temperature Solder Joint Encapsulant for Sn/Bi Applications

Jan 12, 2016 | Dr. Mary Liu and Dr. Wusheng Yin

The electronic industry is currently very interested in low temperature soldering processes such as using Sn/Bi alloy to improve process yield, eliminate the head-in-pillow effect, and enhance rework yield. However, Sn/Bi alloy is not strong enough to replace lead-free (SAC) and eutectic Sn/Pb alloys in most applications. In order to improve the strength of Sn/Bi solder joints, enhance mechanical performance, and improve reliability properties such as thermal cycling performance of soldered electronic devices, YINCAE has developed a low temperature solder joint encapsulant for Sn/Bi soldering applications. This low temperature solder joint encapsulant can be dipped, dispensed, or printed. After reflow with Sn/Bi solder paste or alloy, solder joint encapsulant encapsulates the solder joint. As a result, the strength of solder joints is enhanced by several times, and thermal cycling performance is significantly improved. All details will be discussed in this paper....

Publisher: YINCAE Advanced Materials, LLC.

YINCAE Advanced Materials, LLC.

Yincae Advanced Materials, LLC is a developer, manufacturer, and supplier of high performance coatings, adhesives, electronic and optoelectronic materials.

Albany, New York, USA

Components/Substrates, Contract Manufacturer, Manufacturer of Assembly Material

Solderable Anisotropic Conductive Adhesives for 3D Package Applications

Jan 12, 2016 | Dr. Mary Liu and Dr. Wusheng Yin

3D packaging has recently become very attractive because it can provide more flexibility in device design and supply chain, reduce the gap between silicon die and organic substrate, help miniaturize devices and meet the demand of high speed, provide more memory, more function and low cost. With the advancement of 3D packaging, the bump height is now down from 80μ to 10μ. When the bump diameter is 20-40μ and height 10μ, the process and reliability are obvious issues. It is well known that underfill can enhance the reliability for regular flip chip, however underfill won’t help assembly process. In order to resolve some difficulties that 3D packaging faces, YINCAE Advanced Materials, LLC has developed solderable anisotropic conductive adhesives for 3D package applications. In this paper we will discuss the assembly process and reliability in detail....

Publisher: YINCAE Advanced Materials, LLC.

YINCAE Advanced Materials, LLC.

Yincae Advanced Materials, LLC is a developer, manufacturer, and supplier of high performance coatings, adhesives, electronic and optoelectronic materials.

Albany, New York, USA

Components/Substrates, Contract Manufacturer, Manufacturer of Assembly Material

An Innovative Reliability Solution to Interconnect of Flexible/Rigid Substrates

Jan 12, 2016 | Dr. Mary Liu and Dr. Wusheng Yin

With the pitch size of interconnect getting finer and finer, the bonding strength between flexible and rigid (e.g. PCB, ceramic) substrates becomes a serious issue because it is not strong enough to meet the customer’s requirement. Capillary underfill has been used to enhance the bonding strength between flexible and rigid substrates, but the enhancement is very limited, particularly for high temperature application. The bonding strength of underfilled flexible/rigid interconnect is dramatically decreased after being used at 180◦C, and the interconnects are weakened by the internal stress caused by the expansion of underfill at high temperatures. In order to resolve reliability issues of the interconnect between flexible/rigid substrates, solder joint encapsulant was implemented into the thermal compression bonding process, which was used to manufacture the interconnect between flexible/rigid substrates. Compared to the traditional process, the strength of the interconnect was doubled and the reliability was significantly improved in high temperature application....

Publisher: YINCAE Advanced Materials, LLC.

YINCAE Advanced Materials, LLC.

Yincae Advanced Materials, LLC is a developer, manufacturer, and supplier of high performance coatings, adhesives, electronic and optoelectronic materials.

Albany, New York, USA

Components/Substrates, Contract Manufacturer, Manufacturer of Assembly Material

Solder Joint Encapsulant Adhesive - LGA High Reliability And Low Cost Assembly Solution

Jan 12, 2016 | Dr. Mary Liu and Dr. Wusheng Yin

More and more Land Grid Array (LGA) components are being used in electronic devices such as smartphones, tablets and computers. In order to enhance LGA mechanical strength and reliability, capillary flow underfill is used to improve reliability. However, due to the small gap, it is difficult for capillary underfill to flow into the LGA at SMT level. Due to cost considerations, there are usually no pre-heating underfill or cleaning flux residue processes at the SMT assembly line. YINCAE solder joint encapsulant SMT256 has been successfully used with solder paste for LGA assembly. Solder joint encapsulant is used in in-line LGA soldering process with enhanced reliability. It eliminates the underfilling process and provides excellent reworkability. The shear st rength of solder joint is stronger than that of underfilled components. The thermal cycling performance using solder joint encapsulant is much better than that using underfill. Bottom IC of POP has been studied for further understanding of LGA assembly process parameters. All details such as assembly process, drop test and thermal cycling test will be discussed in this paper....

Publisher: YINCAE Advanced Materials, LLC.

YINCAE Advanced Materials, LLC.

Yincae Advanced Materials, LLC is a developer, manufacturer, and supplier of high performance coatings, adhesives, electronic and optoelectronic materials.

Albany, New York, USA

Components/Substrates, Contract Manufacturer, Manufacturer of Assembly Material

The Future of Solder Joint Encapsulant

Jan 08, 2016 | Dr. Mary Liu and Dr. Wusheng Yin

Solder joint encapsulant adhesives have been successfully used to enhance the strength of solder joints and improve thermal cycling as well as drop performance in finished products. The use of solder joint encapsulant adhesives can eliminate the need for underfill materials and the underfill process altogether, thus simplifying rework, which results in a lower cost of ownership.

Solder joint encapsulant adhesives include: low temperature and high temperature solder joint encapsulant adhesives, and their derivatives. Each solder joint encapsulant adhesive has: unfilled and filled solder joint encapsulant adhesives, and solder joint encapsulant paste. Each solder joint encapsulant product has been designed for different applications. In this paper, we are going to discuss the details and future of solder joint encapsulant adhesives. ...

Publisher: YINCAE Advanced Materials, LLC.

YINCAE Advanced Materials, LLC.

Yincae Advanced Materials, LLC is a developer, manufacturer, and supplier of high performance coatings, adhesives, electronic and optoelectronic materials.

Albany, New York, USA

Components/Substrates, Contract Manufacturer, Manufacturer of Assembly Material

Effect on Microwave Plasma Surface Treatment for Improved Adhesion Strenght of Direct Copper Plating on Polytetrafluoroethylene (PTFE)

Jan 07, 2016 | Akira Takeuchi, Takahiro Kurahashi, Kyosuke Takeda

The purpose of this study is to investigate the effect of plasma surface modification to improve adhesion strength between polytetrafluoroethylene (PTFE) and electroless copper plating. PTFE is widely used in many industries because of its unique electrical, thermal, and mechanical characteristics. However, because of its low surface energy, it is difficult to acquire enough adhesion strength between PTFE and other substances without surface modification. Plasma is well known as one of the surface modification techniques that improve adhesion strength....

Publisher: Nissin Corporation

Nissin Corporation

Nissin supplies electron element materials, anisotropic conductive films, direct-current power supply systems, uninterruptible power supplies.

Nishinomiya, Japan

Other

Study on Solder Joint Reliability of Fine Pitch CSP

Dec 31, 2015 | Yong Hill Liang, Hank Mao, YongGang Yan, Jindong (King) Lee; AEG, Flextronics International.

Today's consumer electronic product are characterized by miniatuization, portability and light weight with high performance, especially for 3G mobile products. In the future more fine pitch CSPs (0.4mm) component will be required. However, the product reliability has been a big challenge with the fine pitch CSP. Firstly, the fine pitch CSPs are with smaller solder balls of 0.25mm diameter or even smaller. The small solder ball and pad size do weaken the solder connection and the adhesion of the pad and substrate, thus the pad will peel off easily from the PCB substrate. In addition, miniature solder joint reduce the strength during mechanical vibration, thermal shock, fatigue failure, etc. Secondly, applying sufficient solder paste evenly on the small pad of the CSP is difficult because stencil opening is only 0.25mm or less. This issue can be solved using the high end type of stencil such as Electroforming which will increase the cost....

Publisher: Flex (Flextronics International)

Flex (Flextronics International)

Flextronics is a global full-service supplier of a full spectrum of value-added Electronic Manufacturing Services.

Singapore, Singapore

Design, Service Provider

PCB Fabrication Processes and Their Effects on Fine Copper Barrel Cracks

Dec 23, 2015 | Edward Arthur, Charles Busa, Melissa Durfee, Chad Gibson, Wade Goldman P.E.; Raytheon Company, Space and Airborne Systems, The Charles Stark Draper Laboratory, Inc., Raytheon Company, Integrated Defense Systems.

The onset of copper barrel cracks is typically induced by the presence of manufacturing defects. In the absence of discernible manufacturing defects, the causes of copper barrel cracks in printed circuit board (PCB) plated through holes is not well understood. Accordingly, there is a need to determine what affects the onset of barrel cracks and then control those causes to mitigate their initiation.

The objective of this research is to conduct a design of experiment (DOE) to determine if there is a relationship between PCB fabrication processes and the prevalence of fine barrel cracks. The test vehicle used will be a 16-layer epoxy-based PCB that has two different sized plated through holes as well as buried vias....

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

Good Product Quality Comes From Good Design for Test Strategies

Dec 17, 2015 | Adrian Cheong

Product quality can be improved through proper application of design for test (DFT) strategies. With today's shrinking product sizes and increasing functionality, it is difficult to get good test coverage of loaded printed circuit boards due to the loss of test access. Advances in test techniques, such as boundary scan, help to recover this loss of test coverage. However, many of these test techniques need to be designed into the product to be effective.

This paper will discuss how to maximize the benefits of boundary scan test, including specific examples of how designers should select the right component, connect multiple boundary scan components in chains, add test access to the boundary scan TAP ports, etc. A discussion of DFT guidelines for PCB layout designers is also included. Finally, this paper will include a description of some advanced test methods used in in-circuit tests, such as vectorless test and special probing methods, which are implemented to improve test coverage on printed circuit boards with limited test access....

Publisher: Agilent Technologies, Inc.

Agilent Technologies, Inc.

World's premier measurement company, providing the critical tools and technologies that sense, measure, and interpret the physical and biological world.

Loveland, Colorado, USA

Manufacturer of Assembly Equipment

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