March 7-10, 2010

Burn-in & Test Socket WorkshopTM


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BiTS is the world's premier workshop dedicated to providing a forum for the latest information about burn-in and test socketing, and related fields.
At BiTS you'll find a comprehensive technical program, exhibits of the latest products and services, and many opportunities to meet, network and explore ideas with other test and burn-in socketing professionals.

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The papers in this publication comprise the proceedings of the 2010 BiTS Workshop. They reflect the authors’ opinions and are reproduced here as presented with occasional minor edits. Their inclusion in this publication does not constitute an endorsement by the BiTS Workshop, the sponsors, BiTS Workshop LLC, or the authors.

There is NO copyright protection claimed by this publication; some tutorials may be copyrighted. However, each presentation is the work of the authors and their respective companies: as such, it is strongly suggested that any use reflect proper acknowledgement to the appropriate source. Any questions regarding the use of any materials presented should be directed to the author/s or their companies.

All photographs on this page are copyrighted by BiTS Workshop LLC. The BiTS logo and ‘Burn-in & Test Socket Workshop’ are trademarks of BiTS Workshop LLC.

Technical Program

Authors from around the world shared their latest work in 30 Papers and Posters covering a prominent range of timely and fundamental topics.

A TechTalk session was introduced, where Tom Bresnan and Guy Ramsey of R&D Circuits shared their deep knowledge of PCB design and fabrication for printed circuit board products specializing in ATE.

Gert Hohenwarter of Gatewave Northern, the Tutorial instructor, went in depth on basic RF theory and testing tools and techniques used to characterize high speed electrical parameters of sockets and interconnects.

Françoise von Trapp, editorial director of 3D InCites and self-proclaimed 'Queen of 3D' reviewed the latest trends and technologies related to 3D packaging challenges gave a brief overview of the 3D roadmap, and highlighted the technology benefits of 3D TSV adoption in her Invited Speaker address. This set the stage for her main challenge on test’s readiness for 3D TSV.

Keynote Speaker, Ken Butler, of Texas Instruments, updated the attendees on the latest developments in adaptive test, while Distinguished Speaker Tom Di Stefano of Centipede Systems gave a peek into the manufacturing possibilities of testing packaged parts in trays.

Finally, Brandon Prior of Prismark Partners returned to BiTS to give attendees an update on the latest in low cost / small form factor packaging and interconnect trends in his Market Update talk.

BiTS EXPO 2010
41 exhibitors, from socketing and related industries, exhibited their products and services during breaks in the technical program.  Click HERE for more info on BiTS EXPO 2010.
BiTS 2010 brought together well over 300 participants, including nearly 250 full conference attendees, and 41 exhibitors from around the world, representing end users and suppliers of sockets, boards, burn-in systems, handlers, packages and other related equipment, materials and services.
BiTS 2010 in the Press
BiTS 2010 Organizing Committee
Front: Paul Boyce (Advantage Specialist), Owen Prillaman (Tech-Connect Sales), Kena Pegram (Sanyu Electric), Fred Taber (BiTS Workshop), Chris Garza (Conference Management Services), Mark Murdza (Cascade Microtech), John Moore (Texas Instruments)

Back: Valts Treibergs (Multitest), Joachin Moerbt (Advantest Europe), Steve Hamren (Micron)

Not pictured: Marc Knox (IBM), Rafiq Hussain (AMD), Tim Swettlen (Intel), Morton Jensen (Intel), Ila Pal (Ironwood Electronics)



PCB Design, Fabrication and Assembly

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Tom Bresnan
Sales Manager

Guy Ramsey
Assembly Division General Manager

R&D Circuits


TechTalk covers producing the printed circuits boards you want - from start (Design) to (Fabrication) finish (Assembly)”.

With escalating electrical performance demands, the Printed Circuit Board is not only an essential part of a package test and/or burn-in solution, but has become an integral component for success. This TechTalk offers attendees an interactive, across the board examination of those PCBs sitting under your socket. The focus is on learning about the challenges to properly select materials, layout, manufacture and assemble the PCB. In ‘bringing the Printed Circuit Board shop to the ‘classroom’, a better understanding of the challenges you and your PCB vendors face is discussed.

First a brief history of the PCB or PWB (Printed Circuit/Wiring Board) industry is covered, specifically in relation to the ATE industry. Next the talk will address the common challenges the industry deals with in the layout of a high yielding, yet lower volume process flow. Once designed, the discussion covers the main cost and technical drivers of the PCB. Those being the pitch, layer count, board thickness and via drill hole diameter (to name but a few of the critical attributes of today’s interface boards). Once built, the presentation explains the assembly challenges and tricks that are required to complete the final PCB assembly.

Last, but certainly not least, the quality and performance characteristics you can demand of your supplier(s) is analyzed. Even with today’s boards becoming more crowded (with components) and pitch and pin counts driving attributes ever smaller, there are ways to verify and validate the quality of your interface boards with your suppliers. Attendees learn how, with samples of data gathered over years of process development, characterization and verification.

Mr. Tom Bresnan is the National Sales Manager at R&D Circuits of South Plainfield, NJ. His more than 25 years of Printed Circuit Board manufacturing experience includes positions in various Engineering and Management roles for some of the world’s largest manufacturers of complex Printed Circuit Boards, including Hadco, Multek and Sanmina-SCI. He is a distinguished lifetime member of the IPC (a US based, global trade organization representing the printed circuit industry) Technical Activities Executive Committee, and has presented and published numerous technical articles for the industry on MCM-L’s and advanced plating capabilities. He resides in Colonia, NJ with his wife Joanne and sons, TJ and Kyle.
Guy Ramsey is R&D Circuits’ Assembly Division General Manager operating the Allentown Pennsylvania facility. He maintains IPC Master Certification credentials. The IPC has recognized him for distinguished committee service in development of many Industry Consensus Standards. Areas of special interest include statistical process control and methods for establishing benchmarks in assembly process performance. Diverse companies have sought his council on subjects ranging from Design for Manufacturing and Assembly to End of Product Life Evaluation. Outside the office, Guy serves as Vice President of the Macungie Borough Council (elected municipal official), fiddles with antique audio equipment, designs high performance speaker systems and toils endlessly on the 150 year old family home.



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Gert Hohenwarter, Ph.D.


Gatewave Northern, Inc.

Gert Hohenwarter has a Diplom - Ingenieur degree in Elektrotechnik from the Technical University Braunschweig, Germany and a MSEE and Ph.D. from the University of Wisconsin, Madison.

As the principal of GateWave Northern, Dr. Hohenwarter has gained substantial experience in characterizing test sockets and probe cards for the ATE industry. His development of high speed interfaces via electrical, thermal and structural finite element modeling has been instrumental in prototyping and production environments. Gert’s work also exposes him to signal integrity prediction and verification of high speed connectors and PCBs as well as troubleshooting on the test floor.

Gert holds several patents in the areas of high speed connections and interfaces and is a member of the scientific research society Sigma Xi.

This Tutorial is taught by Gert Hohenwarter of GateWave Northern, an industry expert on socket and interconnect characterization. In this tutorial he brings the electrical measurements lab to the classroom.

The material and demonstrations are tailored for both the manufacturers of test sockets as well as the end user. The lab starts with a brief foundation of the relevant parameters and their importance in the final application. This will promote understanding of the basic concepts for electrical and non-electrical engineers alike.

With that knowledge gained, various testing configurations are discussed. Among those are traditional spring probe test arrangements as well as more complex BGA pin arrays. Pin pairs, differential and multi-port measurements will also be examined. Configuration specific issues such as parasitic inductance and capacitance of interfaces to the socket that affect socket application as well as testing are included in this discussion.

The lab then covers various testing equipment used in the industry including inductance analyzers, time domain reflectometers and vector network analyzers. An accounting of each instrument’s specific strengths, weaknesses and practical limitations is given.

A hands-on test section with scale models operating at low frequency for ease of use allows for examination of specific configurations during the lab.

Finally, attendees have the chance to analyze test reports and learn how to extract the most information for their specific application.

Who should have attended this tutorial?:
This tutorial offers a great learning environment for a wide range of workshop attendees. Those with a basic knowledge of the socket’s electrical attributes will have the opportunity to step through all the measurement methods and gain an understanding of how the industry uses these results. Attendees already comfortable with these basic concepts found both the practical demonstrations as well as the small classroom setting with an expert helpful to strengthening their electrical knowledge. Where else can you have 1:1 experience with an 18 year veteran in the field of signal integrity?



Invited Speaker

Rising to the 3D TSV Test Challenge: Will You Be Ready?

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Françoise von Trapp

Editorial Director

3D InCites

3D integration is not a novel concept. Veterans in the industry will tell you it’s been around for 20 years. In fact many 3D integration configurations, such as package-on-package (PoP) configurations, stacked die interconnected with wirebond or flip chip, and other 3D wafer-level packaging (WLP) technologies that utilize the existing WLP supply chain such as fan-out WLP, Freescale’s redistributed chip package (RCP), and Infineon’s eWLB, are already being manufactured in volume. While these configurations have most assuredly posed challenges to the test community, the technology proving to be most elusive is naturally the newest kid on the block: 3D ICs stacked using through silicon via (TSV) interconnects.

However, while test solutions are high on the list of limitations yet to be overcome, experts agree that such deficiencies won’t slow down market adoption of 3D TSVs, and that when the time comes, solutions will be available. Indeed, one giant step towards assuring this is communication between the manufacturing and test communities, and in turn, an increased awareness in the test community of what the challenges are, and what issues they’ll be asked to solve.

As such, this talk offers a brief overview of the 3D roadmap, the technology benefits of 3D TSV adoption, the test obstacles TSV stacking presents, R&D efforts addressing these solutions thus far, alternatives being suggested, and other information to help you decide if your company should take up the gauntlet.


Ms. von Trapp is the co-founder and editorial director of 3D InCites, a sponsor-supported, interactive online community created to stir up interest in 3D integration. Dubbed "Queen of 3D" because of her editorial focus on the emerging 3D integration technologies, she initially launched her blog, Françoise in 3D, earlier in 2009. It now resides on 3D InCites. Formerly managing editor of Advanced Packaging magazine, she became well known in the advanced packaging community as an industry commentator, covering symposiums and conferences, participating in trade shows, and moderating panel discussions. Additionally, she worked with engineers, analysts, and industry executives to develop content for both online and print publications. She holds a BA in Communications from the University of New Hampshire, Durham NH.



Opening Remarks

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Welcoming remarks from the General Chair, Fred Taber

BiTS 2010 Keynote Address

 Realizing the Benefits of Adaptive Test

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Ken Butler
Texas Instruments

Like most of the rest of the world, the electronics industry is under extreme pressure to drive out cost wherever possible. Outsourcing has become a way of life. IDMs in the US are nearly extinct since development and manufacturing costs must be amortized over a much larger product base. The ATE industry is a shadow of its former self and everyone is looking for the least expensive platform possible. It’s harder and harder to stay in business, let alone stay competitive.

We hear a lot lately about adaptive test and the potential to use it to reduce manufacturing costs, but what is it really? Will adaptive test techniques make burn-in obsolete? How do we use these ideas effectively within my manufacturing flow? How hard is it to integrate into our existing test and data infrastructure? In this talk we will look at the history and evolution of adaptive test. The concepts have been around for 10 years or more, but most are far from being considered entrenched. By comparison, on-chip scan compression techniques were introduced around 2002 and saw pervasive adoption across much of the industry almost overnight, at least for large system on chip designs. Why the difference? Can the case be made for the economic benefits of adaptive test? Of course adaptive test is no panacea, but we will see that when it is implemented correctly, it can do much to streamline a manufacturing operation, speed product ramps, and reduce costs. It will require an increased level of standardization, much improved data mining and statistical analysis techniques, and stronger and more open communication across the entire supply chain. But everyone who participates in the process will benefit.


Kenneth M. (Ken) Butler is a TI Fellow in the Design Reliability group within the External Development and Manufacturing Division at Texas Instruments. Prior to that, he spent 13 years in TI’s ASIC Division as a design for test engineer. Ken has a BS from Oklahoma State University and an MS and PhD from the University of Texas at Austin, all in Electrical Engineering. He is a Golden Core member of the IEEE Computer Society and a Fellow of the IEEE.


Session 1

 Socket Design, You Want What?

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We all know the story, better, faster, cheaper. But with the ever present demand for higher speeds, finer pitches and custom packages how are we to keep up while keeping costs under control? This session’s authors share some ideas that address these issues. Volume manufactured, high speed test sockets, and modular designs to manage costs and address custom package requirements will all be on the agenda for this exciting session.
"Development of a 33Ghz Final Test Socket"
Fred Megna
MJC Electronics Corp.
Hidekazu "Hide" Miura
MJC Electronics Corp.
"Socket Designs That Save Money"
Larry Furman
Plastronics Socket Company
Mike Ramsey
Plastronics Socket Company
"Challenges of Test on Balls at Burn-in"
Roland Muwanga
Intel Corporation
Bimal Shah
Intel Corporation
Todd Coons
Intel Corporation
"An Adaptable Test Socket Concept that Meets Both the Test and Burn-In Needs of 21st Century Array Packages"
Alexander Barr
3M Company
Akihiko Furuta
Sumitomo 3M Ltd.
Masahiko Kobayashi
Sumitomo 3M Ltd.
Yoshihisa Kawate
Sumitomo 3M Ltd.


BiTS 2010 Distinguished Speaker
Test-in-Tray Perspective

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Dr. Thomas Di Stefano


Centipede Systems, Inc.

Advances in Test-in-Tray technology have potential to improve greatly the productivity of burn-in and test for semiconductor electronics. With the growing complexity of IC devices, back end test operations consume an ever increasing portion of manufacturing cost. This trend cannot continue. Test-in-tray (TnT) enables full “lights-out” automation through all back-end processes where individual parts are not handled, manually or robotically, until pack and ship. The major wafer fabs have implemented full lights out automation years ago using the FOUP as a standard wafer carrier. A standard tray carrier serves the same role for back end processes. Automation equipment can be standardized around TnT for efficiency and a minimum of custom fixturing.

A recently announced FlexFrame carrier overcomes problems that have hindered testing in tray or strip format. Although strip testing greatly increases test throughput where applicable, the method is limited to certain specific devices that can be tested in strip format. Further, dimensional stability, part placement, and cost of complex strip handlers have stunted adoption. The FlexFrame carrier overcomes these problems by holding devices in a dimensionally stable tray that is CTE matched to its mating contactor socket. Now, the placement and number of devices in the tray may be matched to ATE test capacity. The FlexFrame carrier allows easy alignment and insertion/extraction from the mating contactor socket, greatly simplifying the process and reducing the cost of automation.

Test-in-Tray methods are applicable to a full range of semiconductor devices from WLP and TSV chips to complex BGA packages and MEMS sensors. TnT has the full potential to revolutionize the test industry – and the change is needed now. Open standards are essential to support a great opportunity for all.


Dr. Tom Di Stefano is President and CEO of Centipede Systems, an emerging leader in micro connection for semiconductor electronics. Prior to founding Centipede, Tom was the founding President of Tessera Technologies, a world leader in miniaturized packaging. Royalties from Patents co-authored by Di Stefano generated more than $1Billion revenue for Tessera. Previously, Tom was a Senior Manager at the IBM T. J. Watson Research Center, where he was elected to the IBM Academy of Technology and a member of the IBM Technology Leadership Council. Tom earned a PhD in Applied Physics from Stanford University. He received a BSEE Summa cum Laude from Lehigh University. Tom is an author of more than 230 US Patents.


Poster Session


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Poster Sessions offer an additional means for scientific communications between authors and attendees. With their interactive nature, Poster Sessions provide authors and attendees with the opportunity to share and explore ideas more deeply, yet less formally, than a podium presentation.

"New Polyarylketone Polymer for Use in the Manufacturing
of Test Sockets: OXPEKK®"
Tim Spahr
Oxford Performance Materials
"Shortest Spring Pin (so far) - Practical Implication"
Jay Kim
Western Specialty Tech, LLC
M. G. Seo
OKins Electronics, Co. Ltd.
"POP Solution Configurations and Challenges"
Jim Spooner
Interconnect Devices Inc.
"Hybrid BK Elastomer Socket"
Behrouz Sadrabadi
Qualmax America Inc.
Rani Awale
Qualmax America Inc.
Byung-Gi Kim
Leeno Industrial Inc.
“BGA Spring Probe for Final Test”
Eichi Osato
Micronics Japan Co., Ltd.
Fred Megna
MJC Electronics Corp.

Market Update

 Low Cost, Small Form Factor Packaging

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Brandon Prior
Senior Consultant
Prismark Partners

While size reduction and performance improvement are often the drivers of new package and interconnect solutions, cost reduction strategies have become an even more critical factor to further enable continued profitability through challenging times. Although those times are hopefully (albeit temporarily) behind us, many companies large and small have adopted strategies to reduce package, interconnect and test cost. This presentation looks at leading package trends driven by cost reduction.


Mr. Brandon Prior joined Prismark Partners in 1996 and is the editor of Prismark’s Semiconductor and Packaging Quarterly Report. He works with the leading component, equipment and material providers to provide custom market and technology research in the area of IC packaging. Mr. Prior earned BA and BE degrees from Dartmouth College and the Thayer School of Engineering in Hanover NH.


Session 2

 Smarter PCB Design

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With higher frequencies and even more pressure to reduce costs, methods to achieve higher performance from a PCB and at the same time, reduce cost of ownership is more important than ever. In this session we will explore some technologies, techniques and methods to improve PCB signal integrity, reduce layer count and get extended production life from your boards.
"Impact of Parasitic Resonances on Load Board Performance"
Gert Hohenwarter
Gatewave Northern, Inc.
"The Importance of the Signal Return Path"
Zaven Tashjian
Circuit Spectrum, Inc.
Kevin Hoffmann
"Using Ground-Signal-Power Stack-Up For Striplines In ATE Load Boards "
Erkan Acar
Intel Corporation
Tim Swettlen
Intel Corporation
"Spring Probe PCB Pad Wear Analysis"
Valts Treibergs
Chris Cuda


Session 3

 Contact Technology Art and Science

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Are you curious about industry advances in contact technologies to overcome lead-free contamination and high temperature test environments; how about low-cost alternatives to traditional spring probe technologies? With a fresh and innovative look at current as well as new contact technologies, this session should to inspire you and your company to new levels of performance in the contact technology arena.
"New Development in High Temperature Spring Probes"
John Winter
Rika Denshi America
Larre Nelson
Rika Denshi America
Toshimitsu Kohtaka
Rika Denshi Co., Ltd.
Eiji Masaoka
Rika Denshi Co., Ltd.
"A Comparison of New Probe Materials Against Pb Free Solder"
Nick Langston
Yamaichi Electronics USA
Hideyuki Ichinosawa—Koshin Kogaku Co., Ltd.  
"Pb Free BGA Contactor - FA & Solutions"
Jiachun (Frank) Zhou
Interconnect Devices, Inc.
Kevin Deford
Interconnect Devices, Inc.
"New Probe Performance in High Volume Production"
Tony DeRosa

Session 4

 Modeling the Real World

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Prediction of the behavior of devices under test, contactors or whole test fixtures is essential for customers and end users of the products. Different methods to forecast the performance in the field are shown during this session. A design of experiment, gathering statistical data, laboratory experiments to evaluate interconnects and modeling of a high frequency test fixture are explained in depth. Are these methods accurate enough to explain behavior in the real world? Comparing the models with test results gives us the answer.
"Design of Experiment for Force vs. Current Evaluation of a 3x3mm Ground Insert"
Harlan Faller
Johnstech International
"Improved Characterization Technique for Contactors"
Ryan Satrom
Marcus Frey
Valts Treibergs
"Using Modeling to Simulate High Frequency Test Results"
Jeff Sherry
Johnstech international
Shawn Lorg

Session 5

Techniques, Components & Advances for Next Generation Test

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Advanced package IC devices continue to drive the need for innovative socket designs plus improved test and measurement techniques. This session introduces a number of innovations that increase measurement accuracy, improve component-level accessibility, additional lifetime and cycle count of contacts/pins, as well as component placement techniques for manufacturability.
"Next Generation CiS (Capacitor in Socket) Featuring Discrete Capacitors and Elastomer Hybrid Schemes"
Shaul Lupo
intel Corporation
Omer Vikinski
Intel Corporation
David Bodardus
Interconnect Devices, Inc.
Khaled Elmadbouly
Interconnect Devices, Inc.
Cody Jacob
Interconnect Devices, Inc
"Multi Level Stacked Socket - Challenges and Solutions"
Mike Fedde
Ironwood Electronics
Ranjit Patil
Ironwood Electronics
Ila Pal
Ironwood Electronics
Vinayak Panavala
Ironwood Electronics
"Advances in WSP - Wafer Socket Pogo-Pin Probing"
James Tong
Texas Instruments
Norman Armendariz
Texas Instruments
"Answering the Call"
Thomas N. Bresnan
R&D Circuits

Wednesday, March 10,  2010


Session 6

Test and Burn-in Operational Considerations

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This session features a sundry collection of papers related to the operational aspects of the test and burn-in business. Beginning with a view of the cost aspects of test flows and processing associated with WLCSP devices, this session then delves into various operationally oriented aspects of test and burn-in sockets: an examination of the specification for life cycles of Burn-in Sockets, a study on the use of laser cleaning of sockets and its influence on operational productivity, and a broad and green view of the Test/Burn-in Operation that examines how the system design itself can address environmental responsibility.
"Test Flow and Handling of WLCSP Devices Have Significant Impact on Cost"
Bob Jemison
RJI Technical Sales
"Your Requirements Please!"
Hideyuki Takahashi
Sensata Technologies Japan
Hide Furukawa
Sensata Technologies, Inc.
"Socket Cleaning With Laser"
Dr. J. M. Lee
IMT Ltd.
J. S. Choi
IMT Ltd.
S. K. Park
OKins Electronics, Co. Ltd.
"An Environmentally Responsible Test During Burn-In System Design"
Bill Barraclough
Aehr Test Systems
Don Richmond
Aehr Test Systems

Session 7

 Innovative Socket Ingredients

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Socketing is being pressed for novel ideas to address the complexities of advanced package test and burn-in. You’ll want to learn how the composition of socket components and materials is stepping up to the challenges as this session’s authors tackle several of the complexities with some socket ‘ingredients’ directed at handling high current, high temperature, and reducing solder transfer and Cres.
"Thermal Characterization Issues and Potential Techniques for Test"
Ashish Gupta
Intel Corporation
Rafael Quintanilla
Intel Corporation
Jaime A. Sanchez
Intel Corporation
James C. Shipley
Intel Corporation
"Using Clad Alloys to Make High Temperature Burn in and Test Sockets"
Jimmy L. Johnson
Brush Wellman Inc.
Robert Bertin
Brush Wellman Inc.

Awards / Closing Remarks

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Closing remarks and some recognition to the people and papers that have distinguished themselves in one way or another at BiTS 2010.

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