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Defect Free QFN Assembly

Defect Free QFN Assembly

The problem with soldering QFN packages is that they float, skew and tilt on the 'domed' melted solder during the SMT re-flow process. This floating, skewing and/or tilting will lead to solder bridging or un-solders. These defects are hard to detect until the assembly reaches test. Troubleshooting these elusive defects can be very time consuming and costly leading to rework, replacement parts, possible late deliveries and eventually the high cost of a re-design.

Read Article...


Brian J. Leach


AccuSpec Electronics, LLC

Visit the Technical Library... Submit Your Technical Paper...

Featured New Products

iineo II
iineo II Pick & Place
Pick & Place

Widely configurable, allowing for 24 different machine possibilities...

Offered by: Europlacer

Tucano Screen Printer
Screen Printer

Print format 600x580 mm, auto-setup functionality...

Offered by: Essemtec

FINEPLACER® femto Automated Sub-Micron Bonder
Die Bonder

Fully automated, sub-micron bonding platform for advanced packaging...

Offered by: Finetech

Featured auction

Surplex GmbH Electronic Equipment Auctions

Electronic Industry: Machines, Measuring Devices & Equipment

Thu, June 8 - July 6 | Online Auction | Surplex GmbH

Plant closure of a leading manufacturer of consumer electronics...

Visit the Equipment Auctions Calendar...

For Sale Online

IPC-JSTD-001 Lead Free Solder Training Kit

IPC-JSTD-001 Lead Free Solder Training Kit

IPC-JSTD-001 Immersion Gold over Electroless Nickel Finish


Electronic Equipment Mart

Universal Instr. Genesis 120Q

Universal Instruments Genesis 120Q Genesis Quad Beam Chipshooter

CE Exchange

all marketplace listings

Screen Printer

DEK 265 GSX Screen Printer

Key Tech Solutions

all marketplace listings

Screen Printer

MPM AP Hi-E Screen Printer


all marketplace listings

Juki TR3 Matrix
Tray Changer

Juki TR3 Matrix Tray Changer


all marketplace listings

Visit Used Equipment Mart... Post Your Equipment Listing Free...


BGA Reflow - We recently got our last BGA X-Ray results back (no X-ray in house yet) and had more than one board/BGA look like the attached image...

Flying Diode - Currently, we encountered that the schottky barrier diode was up side down or misalignment during SMT process...

CAD Export issue: S.O.S - I'm having an issue where the cad I'm getting from customers is referencing pin 1 as the parts placement...

Visit the Forum... Have a Question? Ask for Free...


SMTA Webtorial - Conformal Coating

Online Webinar | Thu, June 9 | Sponsored by: SMTA

This webinar will cover the basics of conformal coating and assumes no prior knowledge of coatings...

Why Clean Electronic Assemblies? - Free Workshop

Online Webinar | Tue, June 14 | Sponsored by: ZESTRON Corporation

The workshop will introduce the most important key elements needed for a successful PCB cleaning process...

Green Manufacturing Expo 2011

Trade Show/Exhibition, Conference | Toronto, Ontario, Canada | Tue, June 21 | Sponsored by: UBM Canon

Hundreds of sustainable manufacturing resources for long-term cost savings, improved process efficiency...

Visit the Event Calendar... Add Your Event Now...

Career Center


Line Technician

Atlanta, GA, USA | Venture Engineering

Materials Engineer and Lab Supervisor

Milpitas, CA, USA | Winslow Automation (aka Six Sigma)

Regional Sales Manager

TX, AZ, NM, USA | Vi Technology


SMT Maintenance Technician & Process Engineering

Fredericksburg, VA, USA

SMT Engineering Professional

Nashville, NC, USA


Puerto Rico

Visit Career Center...

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: Space Coast Chapter Expo, Technical Forum and Barbeque - June 9


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: EMS Training II - June 9-10

SMTnet Express
June 9, 2011

Subscribers: 24788

SMTnet Members:

Companies: 8648

Users: 31719

Capital Equipment Exchange - Used PCB Assembly Equipment

PCB Equipment Auctions

Aegis Software

Aqueous Technologies Zero-Ion g3

Manncorp - SMT and thru hole PCB assembly Equipment

SRT Micra Rework Platform

PPM - Pre-Owned Quad, MPM Equipment

Newsletter Editor - Anna Girouard, listings(at), 1-207-780-0887, 98 Elm Street, Portland, Maine 04101 USA, Tel.207-780-0887.

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