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SMTnet Express, June 11, 2015, Subscribers: 22,861, Members: Companies: 14,392 , Users: 38,338

Technical Library

Solder Paste Stencil Design for Optimal QFN Yield and Reliability

B. Gumpert; Lockheed Martin Corporation

The use of bottom terminated components (BTC) has become widespread, specifically the use of Quad Flat No-lead (QFN) packages. The small outline and low height of this package type, improved electrical and thermal performance relative to older packaging technology, and low cost make the QFN/BTC attractive for many applications.

Over the past 15 years, the implementation of the QFN/BTC package has garnered a great amount of attention due to the assembly and inspection process challenges associated with the package. The difference in solder application parameters between the center pad and the perimeter pads complicates stencil design, and must be given special attention to balance the dissimilar requirements

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Forum search results for related keywords: solder paste stencils, stencil design, QFN.

SMT / PCB Products


ASC International



Pick & Place




Material Handling/Storage


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Solder Paste Stencils

BEST, Inc.



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Apex Factory...

SP700avi Inline Stencil Printer



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GPD Global

The Mark III Reflow System





SMT / PCB Equipment Auctions

ETM, Semiconductor and SMT Assets Xchange Auction

TBD | X-Line Asset Management

Online Exchange Auction - Featuring Items From Kimball Electronics & Others

June 22-24 | Baja-Bid

Electronic Equipment Mart

Essemtec CDS6200-LC

Adhesive Dispensing Equipment

AdoptSMT Europe GmbH



JMW Enterprises

Pick and Place

Pick and Place Equipment

Shenzhen Tek...

Heller 1707-EXL Reflow Oven

Reflow Ovens

IBE SMT Equipment

Cyberoptics Flex Ultra HR

AOI / Automated Optical Inspection

Tekmart International Inc.

Agilent 5DX Series 3

X-Ray Equipment

X-Line Asset Management

Camalot FXD

Adhesive Dispensing Equipment


Creative Electron TruView Prime

X-Ray Equipment

Capital Equipment Exchange

Vitronics Soltec 6747

Soldering Equipment/Fluxes

Baja Bid

Events Calendar

Practical Set-Up & Qualification of Cleaning Process in Modern PCB Assembly

Online Webinar | June 16 |

2015 PCB Cleaning Webinar Series

Online Webinar | ZESTRON

Technology Days 2015

Seminar/Course, Conference | June 17 - 18 | Nordson ASYMTEK

Career Center


Software Engineering

Littleton, CO, United States | Lockheed Martin Corporation

Sales Representative

Mexico | Apex Factory Automation

ATE field service engineer/technician

Atlanta, GA, USA | Seika Machinery, Inc.


Applications and Support Engineer

Maricopa, AZ, 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: SMTA Webtorial: PCB Surface Finishing Overview: Getting the Most Out of Your Surface Finish - June 12 - 19


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: ITI & IPC Conference on Emerging & Critical Environmental Product Requirements - June 12

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

AIM M8 No-Clean Solder Paste

Software for PCB Manufacturing - Unisoft

Industrial cameras

Essemtec Paraquda Multifunctional SMT Center � One Machine Platform for All Tasks

Custom SMT Equipment Nozzles - Count on Tools

XQuik - compact benchtop X-ray inspection system

Global Source for Advanced SMT Solder Products - Amtech

Used SMT Equipment - IBE

ii-Feed tape feeding solution for Europlacer machines

Used SMT Equipment

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

Choose an Oven for Your Reflow Needs

SP700avi inline smt screen printer - Speedprint

PCB Cleaning products - Zestron

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

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