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SMTnet Express, Septemeber 1, 2016, Subscribers: 26,288, Companies: 14,937, Users: 41,025

Technical Library

Reliability Study of Low Silver Alloy Solder Pastes

Jennifer Nguyen, David Geiger and Murad Kurwa; Flex (Flextronics International)

Sn3.0Ag0.5Cu (SAC305) is currently 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 a result, there is a significant increase in the number of alternative low/no silver lead-free solder alloys available in the industry recently. Our previous study showed that many alternative low silver solder paste materials had good printing and wetting performance as compared to SAC305 solder pastes. However, there is lack of information on the reliability of alternative alloy solder joints assembled using alternative low silver alloy solder pastes.

In this paper, we will present the reliability study of lead-free solder joints reflowed using various lead-free alloy solder pastes after thermal cycling test (3000 cycles, 0°C to 100°C). Six different lead-free pastes were investigated. SAC305 solder joints were used as the control. Low and no silver solder pastes and a low temperature SnBiAg solder pastes were also included.

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Forum search results for related keywords: solder joint reliability, low silver, lead free alloy, thermal cycling, SnAgCu, SnBiAg, SnCuNi,

SMT / PCB Products

Test Equipment



BEST, Inc.


GPD Global

Wave Soldering











Vi Technology

Surface Finish

Nordson March





SMT / PCB Equipment Auctions

Teknetix - Featuring Sanyo, Yestech and more SMT machines.

September 15 | Global Partners

Electronic Equipment Mart

MPM Momentum Plus

Screen Printing Equipment


MVP Ultra 1820

AOI / Automated Optical Inspection

Capital Equipment Exchange

Juki KE-750L

Pick and Place Equipment/Feeders

IBE SMT Equipment

PCB Conveyors


JMW Enterprises

Universal Instruments 6380H

Through Hole Equipment

KD Electronics Ltd.

Asymtek SL-940E Select Coat

Adhesive Dispensing Equipment

AdoptSMT Europe GmbH

Events Calendar

LED Cleaning and Reliability - Free PCB Cleaning Webinar

Online Webinar | September 22 | ZESTRON Corporation

Electronics Goes Green 2016+

Conference | September 7 - 9 | IEEE

SMTA International Conference & Exhibition 2016

Conference, Trade Show/Exhibition | September 25 - 29 | SMTA

Career Center

Service and Applications engineer/technician

Chino, CA, USA

SCIENSCOPE International

SMT Service Engineer

Lanham, MD, USA

Apex Factory Automation

Junior .NET Developer

Panningen, Netherlands


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: SMTA Webinar: Practical Guidelines in Handling Moisture Sensitivity of SMT Packages - September 13


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: IPC India 2016 - September 21-23

Technical Editor - Davef (submit your technical articles)

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


Used PCB Assembly Equipment - CE Exchange

SMTAI 2016 Exhibition & Conference, September 25 - 29

Kyzen Free PCB Cleaning Audit

Quality Pre-Owned SMT Eequipment - Robo-Tek

BTU Pyramax reflow oven - global standard of excellence for SMT reflow, semiconductor packaging and LED packaging and assembly.

PCB real-time X-ray inspection - JewelBox Ultra Compact Microfocus X-ray Technology

Used SMT Equipment - IBE

HANDY series Automatic soldering robots - 1 Click SMT - Rework Tools

KIC - Making Reflow Ovens Smarter

PCB Cleaning products - Zestron

ii-Feed intelligent pick and place feeder

Speedprint SP700avi inline SMT screen printer

Late model SMT equipment Auctions - X-Line Asset Management

Fast INSPECTION & automatic COMPONENT REEL COUNTING with XQuik AccuCount - Compact X-Ray system

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