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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.

SMT / PCB Products




Hand Assembly

Virtual Industries

Solder Paste Stencils

BEST, Inc.


GPD Global

Pick & Place

Count On Tools


BTU International







Vi Technology




PDR America


Kurtz Ersa





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

Screen Printing Equipment

ECM Equipment Sales, Inc.

Viscom S6055-II

AOI / Automated Optical Inspection

KD Electronics Ltd.

USI Ultra-Coat Prism 100

Coating and Encapsulation Equipment

IBE SMT Equipment

Juki KE2080E

Pick and Place Equipment/Feeders

X-Line Asset Management

PCB Conveyors


JMW Enterprises

Assembleon AX-501

Pick and Place Equipment/Feeders

Capital Equipment Exchange

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

Training Courses

IPC Training & Certification Courses

Soldering & PCB Rework Courses

Career Center

Quality/Process Engineer III


Charleston, SC | UEC Electronics

Soldering and Test Technician


Orlando, FL | Volt Workforce Solutions

Commission Sales


Everywhere | SMTnet

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 | Upcoming Events


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


Used PCB Assembly Equipment - CE Exchange

Adjustable SMT Carrier - MB Manufacturing

Experience the Blackfox Difference - Premier IPC Training & Certification Center

Metcal CV-5200 Connection Validation Soldering System

3 YEAR WARRANTY ��� Industry first, market leading warranty on all award winning TruView X-Ray inspection products from Creative Electron

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 - Rework Tools

NEW Fully featured benchtop dispenser - GPD Global

Vacuum Tweezers - pick up small components with ease

Discover the Next Generation of Electronics Inspection - Join the YXLON EVOlution

KIC - Making Reflow Ovens Smarter

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

Quality Pre-Owned SMT Eequipment - Robo-Tek

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