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SMTnet Express, July 1, 2015, Subscribers: 22,969, Members: Companies: 14,445, Users: 38,464

Technical Library

Reliability Screening of Lower Melting Point Pb-Free Alloys Containing Bi

Joseph M. Juarez, Michael Robinson, Joel Heebink; Honeywell International, Polina Snugovsky, Eva Kosiba, Jeffrey Kennedy, Zohreh Bagheri, Subramaniam Suthakaran, Marianne Romansky; Celestica.

Aerospace and military companies continue to exercise RoHS exemptions and to intensively research the long term attachment reliability of RoHS compliant solders. Their products require higher vibration, drop/shock performance, and combined-environment reliability than the conventional SAC305 alloy provides. The NASA-DoD Lead-Free Electronics Project confirmed that pad cratering is one of the dominant failure modes that occur in various board level reliability tests, especially under dynamic loading.

One possible route to improvement of the mechanical and thermo-mechanical properties of solder joints is the use of Pb-free solders with lower process temperatures. Lower temperatures help reduce the possibility of damaging the boards and components, and also may allow for the use of lower Tg board materials which are less prone to pad cratering defects. There are several Sn-Ag-Bi and Sn-Ag-Cu-Bi alloys which melt about 10°C lower than SAC305. The bismuth in these solder compositions not only reduces the melting temperature, but also improves thermo-mechanical behavior. An additional benefit of using Bi-containing solder alloys is the possibility to reduce the propensity to whisker growth...

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Forum search results for related keywords: Pb-free alloys, low melting point, bismuth.

SMT / PCB Products



Solder Materials



Apex Factory...




Aegis Software

Material Handling/Storage


Pick and Place








Wave Soldering



Nordson Asymtek

Material Handling...

Count On Tools





Tape and Reel Equipment

Mid America Taping and Reeling

SMT / PCB Equipment Auctions

Complete Factory Closure of Well Maintained SMT and Test Equipment - 20,000 SF Facility

July 13 - 14 | X-Line Asset Management

Electronic Equipment Mart

Panasonic RL-131 Radial Lead Inserter

PTH Equipment


Heller 1707-EXL Reflow Oven

Reflow Ovens

IBE SMT Equipment



JMW Enterprises

Cyberoptics Flex Ultra HR

AOI / Automated Optical Inspection

Tekmart International Inc.

Universal Instruments HSP 4797L

Chipshooters / Chip Mounters

X-Line Asset Management

Pick and Place

Pick and Place Equipment

Shenzhen Tek...

Camalot FXD

Adhesive Dispensing Equipment


Smart Sonic 5000

Stencil Cleaners

Capital Equipment Exchange

Yamaha YV100XG

Surface Mount Technology Equipment

KD Electronics Ltd.

Events Calendar

Low & High Temperature Intrusive Reflow - Getting the Best Yields

Online Webinar | July 15 |

2015 PCB Cleaning Webinar Series

Online Webinar | ZESTRON

Ohio Expo & Tech Forum

Conference, Trade Show/Exhibition | July 16 | SMTA

Career Center


Software Engineering

Littleton, CO, United States | Lockheed Martin Corporation

Sales Representative

Mexico | Apex Factory Automation

Technical Sales Application Engineer

Longmont, CO, United States | A-Tek Systems Group


Bachelor of Engineering in Electric and Electronics

Oppurg, Israel

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 Webtorial: Failure Analysis: Lessons Learned in Manufacturing - July 15, July 22


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: SEMICON West - July 14 - 16

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

PCB Cleaning products - Zestron - Rework Tools

3D CT X-ray Inspection from SEC

Scienscope - Complete PCB Inspection Solutions

Aegis FactoryLogix Paperless Shop Floor Software - Add value, reduce costs and eliminate risk in manufacturing.

ii-Feed intelligent pick and place feeder

HELLER - Choose an Oven for Your Reflow Needs

Whatever the SMT manufacturing need, JUKI has you covered.

MIRTEC - the Global Leader in PCB INSPECTION Technology.

Speedprint SP700avi inline SMT screen printer

MIRAE Mx400 series high speed pick and place

Asymtek Spectrum II series scalable fluid dispensers for assembly of semiconductors, MEMS, storage devices, and PCBs

Used SMT Equipment - IBE

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Heller  2014년 REFLOW OVEN부문 Service Excellence Award 수상

Best SMT Reflow Ovens