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SMTnet Express, September 14, 2023, Subscribers: 25,056, Companies: 11,888, Users: 28,338

█ Electronics Manufacturing Technical Articles

Effects of Assebly Process Variables on Voiding at a Thermal Interface.

The present work offers a discussion and a first case study to identify and illustrate voiding mechanisms for a particular TIM between a heat spreader and the back of a flip chip. Pronounced differences were observed between stencil printing and dispensing in terms of initial void formation, apparently related to the specific properties of the material. Measurements of the effects of heat ramp rate and peak temperature showed the subsequent evolution and final void size distribution to be determined by the initial part of the cure profile up to the material gelling temperature.

Credit: Universal Instruments Corporation

Reflow Techniques for Void Reduction

BTC Void Reduction For Yield and Performance Enhancement

Credit: Heller Industries Inc.

Voids in Solder Joints

Presented at SMTA Boise Expo and Tech Forum, March 20, 2018

Credit: Intel Corporation

Controlling Voiding Mechanisms in the Reflow Soldering Process

While a significant level of voiding can be tolerated in solder joints where electrical conductivity is the main requirement, voiding at any level severely compromises thermal conductivity. For example, in LED lighting modules effective conduction of heat through the 1st level die attach to the substrate and then through the 2nd level attach to the heat sink is critical to performance so that voiding in the solder joints at both levels must be minimized. (...) In this paper, the authors will review the factors that influence the incidence of voids in small and large area solder joints that simulate, respectively, the 1st and 2nd level joints in LED modules and discuss mitigation strategies appropriate to each level. They will also report the results of a study on the effect on the incidence of voids of flux medium formulation and the optimization of the thermal profile to ensure that most of the volatiles are released early in the reflow process.

Credit: Nihon Superior Co., Ltd.

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

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.

Credit: AIM Solder

SEE Forum results for related keywords - "void" (1161)

	LEARN MORE in the Technical Library...
In the past year, the number of technical papers that contributors added to the Technical Library was: 162	MAKE Your Paper More Visible...

█ Printed Circuit Board Assembly & PCB Design Forum

Juki RS-1R laser height calibration? -- Greetings, I would like to do a height calibration, because the laser of the machine seems to be out of control, I'll explain why: When I measure the height of a 0402 resistor, I get around -0.60 to -0.70, when I fix it on what the machines has measured, and resume production, I can see that its not being picked up and the components are on a tape near the next component, but when I switch to -0.4, it suddenly picks it up without any issue for the rest of the day. Also, because of that, I cannot use automatic height calibration on new setups. Any ideas?

Silver conductive glue in syringe - mixing -- Hello, I have litle bit simply question. I have silver conductive glue in small syringe. Can you help my how should I mix this glue in syringe before using? Thank you. M.

	SEARCH the PCB Assembly Forum
In the past year, the number of threads opened on the FORUM seeking your help was: 252	CONTRIBUTE to the Assembly Forum Discussion ...

█ SMT, PCB Electronics Assembly Manufacturing Industry News

Count On Tools, Inc. Celebrates 25 Years of Excellence with Executive Manager, Donna Shook Count On Tools, Inc. (COT), a leading provider of precision components and SMT spare parts, is pleased to announce Executive Manager, Donna Shook's 25th anniversary with the company.... Count On Tools, Inc.
Juki Automation Systems Is Setting New Standards in Efficiency at SMTA International 2023 Juki Automation Systems (JAS), Inc. is pleased to announce its participation in the 2023 SMTA International exhibition. The event is scheduled to take place Oct. 10-11, 2023 at the Minneapolis Convention center in Minneapolis, MN. Juki's expert team will provide live demonstrations of their award-winning ISM UltraFlex 3600S and the groundbreaking Incoming Material Station in booth 1237.... Juki Automation Systems
U.S. Economy Remains Resilient, but Headwinds Loom in Months Ahead; Growth in Eurozone Picked up in Second Quarter IPC releases August 2023 Economic Outlook report... Association Connecting Electronics Industries (IPC)
MIRTEC Showcases Cutting-Edge Inspection Technology at SMTA International 2023 MIRTEC is excited to announce its participation in the highly anticipated SMTA International Exhibition, scheduled to take place at the Minneapolis Convention Center in Minnesota from October 10-11, 2023. MIRTEC will proudly showcase its groundbreaking MV-6 OMNI 3D AOI Series featuring the exclusive OMNI-VISION® 3D Inspection Technology in booth #1201.... MIRTEC Corp
A automated SMT Production Line successfully delivered and running at KINGSUN customer's factory DONGGUAN KINGSUN AUTOMATION TECHNOLOGY CO.,LTD... DONGGUAN KINGSUN AUTOMATION TECHNOLOGY CO.,LTD

SEE more Electronics Assembly Manufacturing News...

█ SMT / PCB Products & Services

NEW SMT / PCB EQUIPMENT & SERVICES - For Sale

Reflow

PCB Reflow Oven Machine I.C.T Lyra Series

I.C.T

SELECTIVE SLDRNG

Pillarhouse Jade Handex

Pillarhouse USA

PCB INSPECTION

MV-6e FIVE CAMERA In-Line AOI System

Mirtec

PCB SOFTWARE

ProntoPLACE SMT & Thru-hole Software

Unisoft

PCB ASSEMBLY

PCB Fab & Assembly

Imagineering

REFLOW OVEN

Voidless / Vacuum Reflow Soldering Oven

Heller

PCB DISPENSING

Island Series Table Top Dispensers

GPD Global

VIEW More New Electronic Manufacturing Products...

█ SMT / PCB Assembly Equipment Auctions

AUCTION | Rawlings - Online Auction Featuring Surplus Assets From Rawlings, A Leading American Sports Equipment Manufacturing Company

AUCTIONEER | The Branford Group

TYPE | Online Auction

FEATURING | Rawlings - Online Auction Featuring Surplus Assets From Rawlings, A Leading American Sports Equipment Manufacturing Company

SCHEDULE | Tue, Sep 26 to Wed, Sep 27, 2023

OPENS | Tuesday September 26, 2023

CLOSES | Wednesday September 27, 2023

EQUIPMENT LOCATION | Caledonia, Minnesota

VISIT the Assembly Equipment Auctions Calendar...

█ Electronic Equipment Mart

MART - Used Electronic Assembly Machines For Sale

Adhesive Dispensers

Musashi FAD2500

KD Electronics Ltd.

AOI INSPECTION

Viscom S3088 Ultra Chrome 3D AOI

Lewis & Clark Viscom S3088 AOI

Lewis & Clark

Soldering - Selective

Juki Cube 460

Baja Bid

PCB PRINTING

DEK NEOHORIZON 03iX

SMTUnion - DEK NEOHORIZON 03iX

SMTUnion

P&P / FEEDERS

Chroma Table Top Single Site Test Handler Model 3111

World Equipment Source - Chroma Table Top Single Site Test Handler Model 3111

World Equipment Source, LLC

	VIEW More Used Equipment For Sale...
122 RFQs were forwarded to equipment suppliers in the past 365 days	SEND a RFQ to Equipment Suppliers ....

MART - Used PCB Assembly Equipment Wanted To Buy

Soldering - Wave

Electrovert VectraElite

Baja Bid

P&P / FEEDERS

Assembleon MG-1R

World Equipment Source Assembleon MG-1R

World Equipment Source, LLC

PCB TEST

Agilent 3070

Lewis & Clark Agilent 3070

Lewis & Clark

PCB TEST

Agilent 3070

KD Electronics Agilent 3070

KD Electronics

SEE Buyers' Used Assembly Equipment Wants

█ Electronics Manufacturing & Assembly Events Calendar

EVENTS

Long Island Expo & Tech Forum | September 13

SMTA

Northeast Mexico Chapter: Kickoff Meeting | September 29

SMTA

█ Electronics Manufacturing Training Courses & PCB Assembly Training

FIND TRAINING FOR:

IPC Certification

Soldering & Rework

PCB Design

Electronics Assembly

Electronics Inspection

Online Training

TRAINING - Electronics Manufacturing and PCB Assembly Training Courses

IDEA-STD-1010 Essentials Online Live Training Course

Multiple dates and locations. Check the link for details

EPTAC Corporation

Idea Counterfeit Component Workshop Online Live Training

Multiple dates and locations. Check the link for details

EPTAC Corporation

Component Identification Online Live Certification

Multiple dates and locations. Check the link for details

EPTAC Corporation

TRAINING - PCB Inspection Electronics Manufacturing Training Courses

IPC-A-640 Interactive PCB Inspection Lab (CIT or CIS Option)

Multiple dates and locations. Check the link for details

EPTAC Corporation

TRAINING - PCB Rework and Hand Soldering Training Courses

Customizable Basic Hand Soldering

Multiple dates and locations. Check the link for details

Blackfox Training Institute, LLC

TRAINING - Online Electronics Manufacturing and Assembly Training Courses

Reflow Soldering 101 Training Course

Surface Mount Technology Association (SMTA)

IPC/WHMA-A-620 Expert (CSE) Certification Training Course

EPTAC Corporation

VISIT All Electronics Manufacturing Training Courses...

█ Electronics Manufacturing & PCB Assembly Jobs

CAREER CENTER - Job Needs & Wants

JOBS - POST your job openings now

Overseas SMT Engineer

All over the world, Alabama, USA

I.C.T ( Dongguan Intercontinental Technology Co., Ltd. )

SMT Engineer, Marketing Representative, Sales Representative, Business Assistant

All over the world, California, USA

I.C.T ( Dongguan Intercontinental Technology Co., Ltd. )

Manufacturing Analyst/Cost Accountant

Williamsport, Pennsylvania, USA

Spartronics

Program Manager

Williamsport, Pennsylvania, USA

Spartronics

Senior Quality Engineer

Williamsport, Pennsylvania, USA

Spartronics

Product Engineer

Williamsport, Pennsylvania, USA

Spartronics

Corporate Director of Quality

Williamsport, Pennsylvania, USA

Spartronics

Purchasing Specialist

Brooksville, Florida, USA

Spartronics

Business Development Manager- High Level Assembly- Remote

Plaistow, New Hampshire, USA

Spartronics

Process Engineer

Williamsport, Pennsylvania, USA

Spartronics

RESUMES - POST your resume now

POSITION: HR Analyst, Technical & Talent Acquisition Coordinator

JOB CATEGORY: Human Resources

CURRENT LOCATION: Titusville, Florida, USA

WILLING TO RELOCATE?: No

SUMMARY OF QUALIFICATIONS: Interview scheduling via Leo/Zoom, onsite, travel, onboard integration to include directors, HR staffing and interns, Welcome First Day communications, Sterling BGI support, Prehire Covid tracking, I9 administration, college team surge support, Y1X SAP Workzone Resource Box, manage TA Specialist sharepoint and HRMS LMPeople corrections

FIND your next job now... FIND your next employee now...

In the past 365 days, the number of jobs that companies listed on SMTnet: 23

█ PCB Design & Assembly Industry Associations

Surface Mount Technology Association (SMTA)

SMTA 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

Association Connecting Electronics Industries (IPC)

IPC 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

Editor - Dave "davef" Fish (submit your technical articles)

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

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