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SMTnet Express, May 24, 2018, Subscribers: 31,054, Companies: 10,942, Users: 24,751

Technical Library

Wettable-Flanks: Enabler for the Use of Bottom-Termination Components in Mass Production of High-Reliability Electronic Control Units

Udo Welzel, Marco Braun, Stefan Scheller, Sven Issing, Harald Feufel; Robert Bosch GmbH

Driven by miniaturization, cost reduction and tighter requirements for electrical and thermal performance, the use of lead-frame based bottom-termination components (LF-BTC) as small-outline no-leads (SON), quad-flat no leads (QFN) packages etc., is increasing. However, a major distractor for the use of such packages in high-reliability applications has been the lack of a visible solder (toe) fillet on the edge surface of the pins: because the post-package assembly singulation process typically leaves bare copper leadframe at the singulation edge, which is not protected against oxidation and thus does not easily solder-wet, a solder fillet (toe fillet) does not generally develop.

Forum search results for related keywords: bottom-termination components, solder fillets.

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SMT / PCB Equipment Auctions

ETM/SMT Exchange Auction Featuring Research Lab and Test Equipment

May 30 - 31 | X-Line Asset Management

Online SMT Auction
Featuring Items From FryMaster

June 25 - 28 | Baja Bid

Electronic Equipment Mart

MPM Ultraprint 2000

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Events Calendar

ITI and IPC Conference on Emerging & Critical Environmental Product Requirements | June 4 | IPC

International Conference for Electronics Enabling Technologies (ICEET) | June 5 - 7 | SMTA

Everything You Need to Know About X-Rays | June 22 | Creative Electron

PCB Cleaning Webinar Series | ZESTRON Corporation

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Industry Associations Events

SMTA

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 | Upcoming Events

IPC

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 | Online Store | Upcoming Events

Technical Editor - Davef (submit your technical articles)

Newsletter Editor - Anna Girouard

SMTnet.com, 98 Elm Street, Portland, Maine 04101 USA, Tel.207-780-0887.

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Metcal CV-5200 Connection Validation Soldering System

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Unused Equipment? - let BajaBid turn your EXCESS ASSETS into cash!

Europlacer iineo+ SMT pick and place with integrated component tester

Kyzen Free PCB Cleaning Audit

Why Use Plasma Treatment Prior To Conformal Coating. Download the 'The Effects of Plasma Treatment Prior to Conformal Coating' White Paper.

Speedprint SP700avi inline SMT screen printer

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NEW Fully featured benchtop dispenser - GPD Global

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KD Electronics - High quality SMT nozzles, feeders, cutters, filters, etc

Quality Pre-Owned SMT Eequipment - Robo-Tek

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