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SMTnet Express, September 21, 2023, Subscribers: 25,074, Companies: 11,894, Users: 28,360

█ Electronics Manufacturing Technical Articles

Using Automated 3D X-Ray Inspection to Detect BTC Defects

Bottom-termination components (BTC), such as QFNs, are becoming more common in PCB assemblies. These components are characterized by hidden solder joints. How are defects on hidden DFN joints detected? Certainly, insufficient solder joints on BTCs cannot be detected by manual visual inspection. Nor can this type of defect be detected by automated optical inspection; the joint is hidden by the component body. Defects such as insufficients are often referred to as "marginal" defects because there is likely enough solder present to make contact between the termination on the bottom-side of the component and the board pad for the component to pass in-circuit and functional test. Should the board be subjected to shock or vibration, however, there is a good chance this solder connection will fracture, leading to an open connection.

Credit: Flex (Flextronics International)

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

The Effect of Coating and Potting on the Reliability of QFN Devices.

The fastest growing package types in the electronics industry today are Bottom Termination Components (BTCs). While the advantages of BTCs are well documented, they pose significant reliability challenges to users. One of the most common drivers for reliability failures is the inappropriate adoption of new technologies. This is especially true for new component packaging like BTCs. Obtaining relevant information can be difficult since information is often segmented and the focus is on design opportunities not on reliability risks (...)

Commonly used conformal coating and potting processes have resulted in shortened fatigue life under thermal cycling conditions. Why do conformal coating and potting reduce fatigue life? This paper details work undertaken to understand the mechanisms underlying this reduction. Verification and determination of mechanical properties of some common materials are performed and highlighted. Recommendations for material selection and housing design are also given.

Credit: DfR Solutions (acquired by ANSYS Inc)

Rework Challenges for Smart Phones and Tablets

Smart phones are complex, costly devices and therefore need to be reworked correctly the first time. In order to meet the ever-growing demand for performance, the complexity of mobile devices has increased immensely, with more than a 70% greater number of packages now found inside of them than just a few years ago. For instance, 1080P HD camera and video capabilities are now available on most high end smart phones or tablet computers, making their production more elaborate and expensive.

The printed circuit boards for these devices are no longer considered disposable goods, and their bill of materials start from $150.00, with higher end smart phones going up to $238.00, and tablets well over $300.00.

Credit: Metcal

SEE Forum results for related keywords - "btc" (28)

	LEARN MORE in the Technical Library...
In the 12 months, the number of technical papers that contributors added to the Technical Library was: 171	MAKE Your Paper More Visible...

█ Printed Circuit Board Assembly & PCB Design Forum

Juki RS-1R laser height calibration? -- Greetings,

Solder Pastes Inspection parameters -- We have a PARMI SigmaX SPI (Solder Paste Inspection) machine, right now I'm trying to understand about parameters of the machine. I know minimus, Maximus, and warning values need to be defined. Height value understands that can be defined by the thickness of the stencil. Volume with the stencil thickness times the aperture size (what's the formula to do this)? We've been having a lot of trouble with missing solder paste, so I want to understand a little bit more about how I can define the parameters, and how can i close the minimum and maximum to ensure solder paste it is being well applied without any insufficient solder paste.

Universal Genesis 2 dual beam damaged by packers, worth fixing? -- I bought a gx37 dual beam series 2 Genesis. It looks like it was in very good condition when it left Malaysia but the axis weren't secured at all for the sea journey. When it arrived the rubber stoppers had all been smashed. The z axis on both heads fails to zero when I've turned it on. Will the most likely be fixable at a sensible price or should I give up on it?

	SEARCH the PCB Assembly Forum
In the 12 months, the number of threads opened on the FORUM seeking your help was: 288	CONTRIBUTE to the Assembly Forum Discussion ...

█ SMT, PCB Electronics Assembly Manufacturing Industry News

Two Public Online Equipment Auctions of Major Multilayer PCB Manufacturers: Fela & Tring The Branford Group ("Branford"), a leader in asset valuation and disposition services, in partnership with Maynards Europe, will be hosting (2) public online auctions to sell surplus assets of Tring & Fela - renowned PCB Manufacturers. The equipment offerings will be available for bidding via two online auction events with Fela closing on September 20th at 11:00 am (CET) and Tring closing on October 4th at 11:00 am (CET)... The Branford Group
SHENMAO Introduces Low-Temperature Ball Attachment Process Solutions SHENMAO America, Inc. is proud to introduce its latest innovation in response to the growing demand for ultra-thin packages in the electronics industry. With the increase in package thinness, the challenge of package warpage and its impact on production yield has become more pronounced.... Shenmao Technology Inc.
Singulating Pre-Scored PCB Panels up to 48"Long Separating skip scored V-Scored PCB panels up to 48" long is made simple and easy with the K4000 PCB depanelizer from FKN Systek. Just place the bottom scoreline of the PCB onto the linear blade and step on a guarded foot switch to bring the circular blade across the top scoreline for clean separation of the PCB panels. Right and left blade guards assure operator safety. The front and back support and take up table are height adjustable.... FKN Systek

SEE more Electronics Assembly Manufacturing News...

█ SMT / PCB Products & Services

NEW SMT / PCB EQUIPMENT & SERVICES - For Sale

PCB DISPENSING

PCD Continuously Volumetric Dispense Pumps

GPD Global

Printing

Full-auto SMT Stencil Printer I.C.T-P4034

I.C.T

SELECTIVE SLDRNG

Pillarhouse Jade Handex

Pillarhouse USA

PCB INSPECTION

MV-7 FIVE CAMERA In-Line AOI System

Mirtec

PCB SOFTWARE

CELLS - MES & Tracking Software

Unisoft

PCB ASSEMBLY

PCB Fab & Assembly

Imagineering

PCB REFLOW OVEN

NEW! Mark 7 Series -
Reflow Oven

Heller

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

AUCTION | ONLINE AUCTION: Multilayer PCB Manufacturer High Technology Circuit Board Facility

AUCTIONEER | The Branford Group

AUCTION TYPE | Online Auction

FEATURING | Surplus to the Ongoing Needs of Tring Timed Online Multilayer PCB Manufacturer High Technology Circuit Board Facility Schmoll DI | Schmoll Drilling | ATG Testing | Camtek AOI Complete Facility, Equipment as late as 2020

SCHEDULE | Mon, Sep 25 - Wed, Oct 4, 2023

OPENS | Monday, September 25, 2023 8:00 AM (CET)

CLOSING BEGINS | Wednesday, October 4, 2023 11:00 AM (CET)

EQUIPMENT LOCATION | Gracanica, Bosnia

FEATURED EQUIPMENT | FEATURED ITEMS | Schmoll MDI Single Table Direct Imager (2 Heads) yr. 2020, Schmoll Drilling & Routing Machine LM2, Jetrite Ink Jet Legend Printer, Schmoll MX1-160 CCD Drilling Machine, Auto PCB V-cut Machine, Model No: CK-1500, ORC HMW 201 B Exposure Unit, 5kW,, OLEC AT30 Exposure Unit, ATG Flying Probe Tester Type A1-1037, Eight Probes, HML LP 2000 VK 2 Lamination Press, UNIPLATE P Permaganate Line, Telmec Scoring Machine, Type SL13.9, MIVA Photo Plotter, Type 2512E T3, Camtek AOI, Type: Orion-604, Camtek AOI, Type: 808, Cemco Quick Silver HASL (leadfree), Targomat - hole drilling machine, Mania Speedy 580 Flying Probe Test System, Lenz CNC Drilling Machine GX4620-2 AL, Lenz CNC Drilling Machine PT 415-2 L, Schmoll Maschinen Auto-System 3, Pill 1050 Alkaline Etching Machine Pill 1050, Pill Tin Resist Stripper, Pill OSP Chemical Line, Holmstand - Soldermask Developer, Pill Resist Developer 1146, Type EXPORT 650, Glutz & Jensen, Type 720 Film Developer, SCHMID Brushing Machine, Posafor Pinning Machine, Wessel/FSM, Type SEPO Pinner, Dynachem 1600IV, Automatic Cut Sheet Laminator, Orbotech Legend Printer, Type: Sprint 8 - (spare part machine), Otto Dilg Brushing Machine, Penta 550 Hot Air Leveler, Dust Extraction System, Numerous Laif-Corema-Mass-Weimer Loaders & Unloaders

VISIT the Assembly Equipment Auctions Calendar...

█ Electronic Equipment Mart

MART - Used Electronic Assembly Machines For Sale

Gen'l Purpose T&M

Zeiss LSM-880 Laser Scanning Microscope

World Equipment Source, LLC

Adhesive Dispensers

Musashi FAD2500

KD Electronics Ltd.

AOI INSPECTION

Viscom S3088 Ultra Chrome 3D AOI

Lewis & Clark Viscom S3088 AOI

Lewis & Clark

Board Cleaners

Aqueous Technologies Trident XLD

Baja Bid

P&P / FEEDERS

Panasonic NPM-W2

SMTUnion - Panasonic NPM-W2 Chipshooter

SMTUnion

	VIEW More Used Equipment For Sale...
SMTnet forwarded 128 RFQs to equipment suppliers in the past 365 days	SEND a RFQ to Equipment Suppliers ....

MART - Used PCB Assembly Equipment Wanted To Buy

PCB TEST

Agilent 3070

KD Electronics Agilent 3070

KD Electronics

Soldering - Reflow

Vitronics XPM 1240

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

SEE Buyers' Used Assembly Equipment Wants

█ Electronics Manufacturing & Assembly Events Calendar

EVENTS

Penang Expo & Tech Forum | September 20

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

IPC Certified Electronics Program Manager (CEPM) Training and Certification Program

Association Connecting Electronics Industries (IPC)

Component Placement 101 Training Course

Surface Mount Technology Association (SMTA)

ESD Control for Electronics Assembly

Association Connecting Electronics Industries (IPC)

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...

█ 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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