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SMTnet Express, May 29, 2014, Subscribers: 22783, Members: Companies: 13874, Users: 36243

Technical Library

Microspring Characterization and Flip-Chip Assembly Reliability

B. Cheng, D. De Bruyker, C. Chua, K. Sahasrabuddhe, I. Shubin, J. E. Cunningham, Y. Luo, K. F. Böhringer, A. V. Krishnamoorthy, E, M. Chow; IEEE

Electronics packaging based on stress-engineered spring interconnects has the potential to enable integrated IC testing, fine pitch, and compliance not readily available with other technologies. We describe new spring contacts which simultaneously achieve low resistance (< 100 mΩ) and high compliance (> 30 �m) in dense 2-D arrays (180 ~ 180-µm pitch). Mechanical characterization shows that individual springs operate at approximately 150-µN force. Electrical measurements and simulations imply that the interface contact resistance contribution to a single contact resistance is < 40 mΩ. A daisy-chain test die consisting of 2844 contacts is assembled into flip-chip packages with 100% yield. Thermocycle and humidity testing suggest that packages with or without underfill can have stable resistance values and no glitches through over 1000 thermocycles or 6000 h of humidity.

This paper suggests that integrated testing and packaging can be performed with the springs, enabling new capabilities for markets such as multichip modules.

read article »

Forum search results for related keywords: flip-chip, MEMS, springs.

SMT / PCB Products

In-Line Test System

by: Digitaltest

in: Test

In-Line AOI Machine

by: Mirtec

in: Inspection

HYDRON� WS 400 - OA defluxing at 3%-5% Concentration (new!)


in: Cleaning

EXCEN PRO High Speed
Modular Mounter


in: Pick & Place

Quantum™ Large-Format Fluid Dispenser (new!)

by: Asymtek

in: Dispensing

KE-Series Placement Machines

by: Juki

in: Pick & Place

TruView - Fully Modular X-Ray System

by: Creative Electron

in: Inspection

Delta 6 Selective Coating & Dispensing System

by: PVA

in: Dispensing

Island Series Benchtop Fluid Dispensers

by: GPD Global

in: Dispensing

Mark5 Series -
Reflow System
The Mark III Reflow System

by: Heller

in: Reflow

Lzero3 Storage and Retrieval Cabinet

by: Europlacer

in: Material Handling/Storage

Stencil Printer

SP700avi Inline Stencil Printer

by: Speedprint

in: Printing

SMT / PCB Equipment Auctions

Surplus Manufacturing and Assembly Equipment Hungary

June 4 - 5 | by: X-Line Asset Management

Electronic Manufacturing Equipment Market #190 North America

June 10 - 12 | by: GoIndustry DoveBid

Electronic Equipment Mart

Samsung RF-2082C
Reflow Oven

AdoptSMT Europe

in: Reflow Ovens

Camalot FXD


in: Adhesive Dispensing Equipment

NMA 40.5"

JMW Enterprises

in: Conveyors

MVP 2012 Spectra
Large Board


in: AOI

DEK Horizon 03

IBE SMT Equipment

in: Screen Printing Equipment

SEHO Go Selective Light
Selective Soldering...

CE Exchange

in: Soldering Equipment

ETA E10 Lead-free Reflow Oven

Shenzhen ETA

in: Reflow Ovens

Juki KE750/760/2050/2060

Shenzhen Tek...

in: Pick and Place Equipment

Events Calendar

MEDTEC Europe 2014

Stuttgart, Germany | June 3 | UBM Canon - The European marketplace for the �100 billion medical device manufacturing industry!...

Upper Midwest Expo & Tech Forum

Bloomington, MN, USA | June 18 | IPC - Workshops and a technical conference, in addition to exhibits from leading PCB and electronics assembly equipment manufacturers...

Solutions for Difficult to Clean Components - Online Webinar

Online | July 24 | ZESTRON Corporation - An overview of various board and component geometries that present cleaning challenges...

Career Center


SMT Operator

Rockleigh, NJ, USA | Crestron Electronics

SMT Equipment Technician


SMT Operator

Phoenix, AZ, USA | Triad Electronic Technologies


SMT Prosess Engineer

Delhi, India

SMT Machine Operator

Mesa, AZ, USA

Manufacturing Engineer /Smt programmer

Sullivan, OH, USA

Industry Associations Events


SMTA - Surface Mount Technology Association is a non-profit international association of companies and individuals (totalling 4,000) involved in all aspects of advanced electronics assembly, surface mount and related technologies.

Membership Info | SMTA Certification | Bookstore

Next Event: Free Webinar: Printed Electronics Technologies - June 11


IPC - Association Connecting Electronics Industries is a US-based trade association dedicated to the competitive excellence and financial success of its nearly 2,600 member companies which represent all facets of the electronic interconnection industry, including design, printed wiring board manufacturing and electronics assembly.

Membership Info | Training & Certification Programs | Standards & Publications - Online Store

Next Event: IMPACT 2014: IPC on Capitol Hill - June 10 - 11

Technical Editor - Davef (submit your technical articles)

Newsletter Editor - Anna Girouard, 98 Elm Street, Portland, Maine 04101 USA, Tel.207-780-0887.

Unsubscribe. | Contact customer service

Used PCB Assembly Equipment - CE Exchange

Software for PCB Manufacturing - Unisoft

ii-Feed tape feeding solution for Europlacer machines

Custom SMT Equipment Nozzles - Count on Tools

JUKI's machines offer you the Lowest Cost of Ownership in the industry.

Fluid Pressure Control - a breakthrough in uniform fluid dispensing - GPD Global

Mark5 SMT Reflow Oven - Heller

SP700avi inline smt screen printer - Speedprint

Global Source for Advanced SMT Solder Products - Amtech

TruView Prime Portable X-Ray Inspection Machine - Creative Electron

Used SMT Equipment - IBE

PVA Flexible, Customized Fluid Dispensing Systems

PCB Cleaning products - Zestron

PCB Equipment Auctions - X-Line

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