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SMTnet Express, September 27, 2018, Subscribers: 31,354, Companies: 11,055, Users: 25,237

Technical Library

Assessing the Effectiveness of I/O Stencil Aperture Modifications on BTC Void Reduction

Carlos Tafoya, Gustavo Ramirez, Timothy O'Neill; AIM Solder

Bottom terminated components, or BTCs, have been rapidly incorporated into PCB designs because of their low cost, small footprint and overall reliability. The combination of leadless terminations with underside ground/thermal pads have presented a multitude of challenges to PCB assemblers, including tilting, poor solder fillet formation, difficult inspection and ��� most notably ��� center pad voiding. Voids in large SMT solder joints can be difficult to predict and control due to the variety of input variables that can influence their formation. Solder paste chemistries, PCB final finishes, and reflow profiles and atmospheres have all been scrutinized, and their effects well documented. Additionally, many of the published center pad voiding studies have focused on optimizing center pad footprint and stencil aperture designs. This study focuses on I/O pad stencil modifications rather than center pad modifications. It shows a no-cost, easily implemented I/O design guideline that can be deployed to consistently and repeatedly reduce void formation on BTC-style packages.

Forum search results for related keywords: stencil aperture, BTC, voids,

SMT / PCB Products




Hand Assembly

Virtual Industries


SlingShot Assembly



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GPD Global

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Coating Equipment

Nordson Asymtek

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Solder Materials


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Pick & Place


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Cleaning Agents


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Seika Machinery

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Creative Electron

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BEST, Inc.

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PDR America

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Kurtz Ersa

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SMT / PCB Equipment Auctions

Closure of Premier Surface Mount Facility - 2017 SMT Equipment

September 27 - 28 | X-Line Asset Management

Electronic Equipment Mart

BTU Pyramax 100A

Reflow Ovens

LEL Semi

Juki KE 3020 (2017)

Pick and Place/Feeders

X-Line Asset Management

DEK Horizon 03iX

Screen Printers

IBE SMT Equipment

Mydata MY9 Only 5000USD

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KD Electronics Ltd.

V-TEK Versacount SMD Counter

Tape and Reel

Capital Equipment Exchange

PCB Conveyors


JMW Enterprises

Events Calendar

SMTA International 2018 Conference & Exhibition | October 14 - 18 | SMTA

High-Reliability Cleaning and Conformal Coating Conference | November 13 - 15 | IPC

PCB Cleaning Webinar Series | ZESTRON Corporation

Training Courses

IPC Training & Certification Courses

Soldering & PCB Rework Courses

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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 - Rework Tools

Selective Conformal Coating System - GPD impleCoat

Vacuum Tweezers - pick up small components with ease

HELLER - Choose an Oven for Your Reflow Needs

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

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Saki's 3D inspection and measurement systems support QUALITY-DRIVEN PRODUCTION.

Hioki 1240 Flying Probe Tester - ultra-high speed measuring, fine pitch inspection.

Experience the Blackfox Difference - Premier IPC Training & Certification Center

Used SMT Equipment - IBE

Innovative aqueous and solvent based technologies for cleaning PCBs

QWIKTRAY - custom component handling matrix tray - Count on Tools

Rework Made Easy - Guided processes with computer aided alignment and 3900W of power - Ersa HR 550 Rework Station

MIRTEC MV 6 OMNI High-Speed / High-Performance 3D AOI MACHINE.

Speedprint SP700avi inline SMT screen printer

Software for PCB Manufacturing - Unisoft

Quality Pre-Owned SMT Eequipment - Robo-Tek

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