New Low Temp. Alloys were developed,through elemental additions,to improve mechanical strength,fatigue life and drop shock resistance.
•Effect of these elemental additions on the new alloys was evaluated using:
–Alloy strength,
–Ductility,
–Thermal conductivity,
–Copper dissolution,
–Creep properties,and
–Bulk and interfacial microstructure stability

Microsystems Enabled PV:
•Technology benefits
•Process flow/assembly examples
•Cost analysis
•From R&D to commercialization
•3DIC/hybrid assembly and new functionality

For the past few years there has been a shift in the Lighting Industry that has carried over to the surface mount technology assembly line. What is this shift you may ask? Well it is the LED revolution. This revolution or change in lighting has some very promising results already in practice and many more companies looking to implement the LED technology into their product portfolio’s. With a number of companies looking to expand their portfolio to include LED fixtures there has been an increase in the number of companies that have started their own SMT lines,as well as a significant number of contract
manufacturers to meet this new industries demands. With this surge in the new style of lighting the manufacturers need the automated pick and place process to achieve the throughputs that are being forecasted; there has been a sudden increase of companies that have faced issues around the pick and place process with less than desirable results. The automated pick and place systems have been used for high-speed,highly accurate placement of a wide range of electronic components. A major factor in the automated pick and place manufacturing for surface mount devices (SMDs) is that most of the components previously being placed have been in use since the1980s. These process parameters and speeds specified have been focused on a solid or hard epoxy molded,flat topside packages,like capacitors,resistors and integrated circuits. Over the multitude of years since the inception of the automated pick and place system,the parameters used to control the equipment have been refined. Now that there is a new product in the industry; it may require some adjustments,Especially when LEDs with a glass or soft silicone molded dome are introduced. This presentation will discuss some issues in the pick and place process for LEDs and presents a method to troubleshoot and resolve these issues.

This paper is the first of two papers discussing the Celestica/Honeywell Lower Melt Alloy program. The program explores the manufacturability and reliability for Pb-freethree Bi-containing alloys in comparison with conventional SAC305 and SnPb assemblies. The first alloy included in the study is a Sn-based alloy with 3.4%Ag and 4.8%Bi which showed promising results in the National Center for Manufacturing Sciences (NCMS) and German Joint (GJP) projects. The other two alloy variations have reduced Ag content,with and without Cu.
BGA and leaded components were assembled on medium complexity test vehicles using these alloys,as well as SAC305 and SnPb as base line alloys for comparison. Test vehicles were manufactured using two board materials,170°C glass transition temperature (Tg) and 150°C Tg,with three surface finishes: ENIG,ENEPIG,and OSP. The ATC testing was done at -55°C to 125°C with 30 minute dwells and 10C/min ramps. Vibration at two G-Force test conditions with resistance monitoring was performed. In this paper,the detailed microstructure examination before testing and after 1500 cycles of -55°C to 125°C,together with failure analysis,is described. These results allow preliminary recommendations of proper combinations of the solder alloys,board materials,and surface finishes for high reliability applications.

Sn3.0Ag0.5Cu (SAC305) is the most popular near eutectic lead-free alloy used in the manufacturing processes. Over the last several years,the price of silver has dramatically increased driving a desire for lower silver alloy alternatives.
As the results,there is a significant increase in the number of alternative low/no silver lead-free solder alloys available in the industry recently. In this paper,we’ll present the performance and process capability of various low/no silver alloy solder pastes. Data from printability,wetting test,slump test,solder ball test,voiding,etc… will be discussed and compared with the control SAC305 solder paste. Benefits and concerns of using low/no silver alloy solder paste materials will also be addressed.
Keywords: lead-free,SAC305 solder paste,low silver alloy solder paste,alternative lead-free solder paste.

Two major drivers in electronic industry are electrical and mechanical miniaturization. Both induce major changes in the material selection as well as in the design. Nevertheless,the mechanical and thermal reliability of a Printed Circuit Board (PCB) has to remain at the same high level or even increase (e.g. multiple lead-free soldering). To achieve these reliability targets,extensive testing has to be done with bare PCB as well as assembled PCB. These tests are time consuming and cost intensive. The PCBs have to be produced,assembled,tested and finally a detailed failure analysis is required to be performed.
This paper examines the development of our concept and has the potential to enable the prediction of the lifetime of the PCB using accelerated testing methods and finite element simulations.
The method of evaluation for the developed concept uses the mechanical loading (drop test) on Printed Circuit Board Assembly (PCBA) test vehicles.
The aim of this study is to show,that experiments on material specimen level in combination with corresponding simulation models,allow a significant reduction of previously required board level tests. Doing so characteristic failure curves,correlating simulated local failure parameters to measured lifetimes,were generated and used to predict the performance of unknown PCB types. Applied tools,in order to determine relevant local failure parameters,were based on fracture mechanics concepts,as e.g. X-FEM and contour integral simulations.
This research was carried out by Austria Technologie & Systemtechnik AG (AT&S AG) in cooperation with the Polymer Competence Center Leoben (PCCL).

Recycling cleaning and rinsing fluids in the manufacturing process is becoming very popular for many reasons. Competitiveness is the key issue as the electronics industry ages. In our golden years,paying attention to the expenses is very important in managing the bottom line. Up to 50% of the monthly utility bills to run the manufacturing line can be related to cleaning the product. Implementing fluid recycling can feed the savings and align management with a positive environmental impact and improved employee health and safety. Accelerating this change is management’s awareness of new and proposed government regulations to protect the work force and the environment. The purpose of this paper is to provide an understanding of how to achieve these targets at the lowest possible cost.
Choosing the best recycling system requires knowledge of the cleaning process and current available recycling technologies. Recycling systems can be specific to a cleaning fluid type. In some instances,the cleaning fluid can be changed to a more recycling friendly fluid. Fluid properties such as alkalinity or flammability can complicate the selection process. Understanding the cleaning process,the fluids used,and appropriate recycling technologies available is very important in selecting a lean and green cleaning process that meets the planned corporate targets.
In situ machine recycling has become the new standard for new cleaning systems. These systems recycle the cleaning fluids in the machine versus sending the fluids to a remote location in the plant or to a third party recycler. These systems can be built into new or existing cleaners. Recycling the cleaning fluids within the cleaner,almost always gives the lowest cost due to reduction of logistics,storage,transport,and third party charges. A cost model should be used to evaluate the choices and select the best options for your cleaning process. To better illustrate the decision process,A cost model is evaluated to compare an open loop aqueous inline cleaner,a remotely located closed loop inline and a in situ closed loop inline. The cost model with field data is used to estimate the cost savings of recycling for each system.

The purpose of this study is to determine whether or not aerosol benchtop cleaning can consistently and reliably clean reworked boards. Different variables that play a role in the effectiveness of aerosol benchtop cleaning were examined. These variables include straw attachment,spray technique,spray angle,handheld cleaning tools,brush attachments,and a final rinse. While no approach to aerosol benchtop cleaning was found to be 100% effective all of the time,the study did yield good information that can be used as general guidelines to improve benchtop cleaning processes.

Over the last years more and more International newspapers reported in Europe / USA and Japan: “Tunnel train got stuck under the Channel – thousands of people stranded “Recall of thousands of cars to workshops for control and repair Power Failures left households without energy for hours. Very often news like this relate to malfunctions of electric and electronic circuits under adverse conditions or sometimes even in normal operating environment.
Considering that in the automotive industry – one of the most dynamic and innovative driving economic force in industrialized countries the number of complex electronic circuits will increase drastically over the next decade - ensuring reliability will become a focus in high- quality electronics production.
Highly integrated circuitry and the permanent miniaturization makes high quality production more and more crucial.
The reliability of such complex circuitry can be ensured using cleaning in all steps of the production process,from stencil cleaning to PCB cleaning prior to coating or painting in order to increase the reliability and life span of the units into which such circuitry will be installed.
The use of environmentally friendly water based chemistries instead of ozone layer depleting VOC-containing solvents – once the standard in the electronics industry- as well as the use of respective machines that operate under the condition of saving energy and resources will gain more and more importance and cannot be neglected anymore.
The presentation will deal with all kinds of aspect of cleaning to ensure the reliability of electronic circuitry in ever changing operation conditions in the most important industrial areas.

This paper examines the nature; the consequences and the mitigation of electrical overstress (EOS) caused by electromagnetic interference (EMI),or electrical noise,on power lines and ground in manufacturing environment.