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SMTnet Express, July 14, 2022, Subscribers: 25,319, Companies: 11,585, Users: 27,344

█  Electronics Manufacturing Technical Articles

Reliability Testing For Microvias In Printed Wire Boards

Traditional single level microvia structures are generally considered the most robust type of interconnection within a printed wire board (PWB) substrate. The rapid implementation of HDI technology now commonly requires between 2, 3 or 4 levels of microvias sequentially processed into the product. Recent OEM funded reliability testing has confirmed that by increasing the levels (stack height) these structures are proving less reliable, when compared to their single or double level counterparts. Recently false positive results have been recorded on products tested with traditional thermal shock testing methodology (cycling between -40°C and 125°C, or 145°C). A number of companies are incurring product failures resulting in increased costs associated with replacing the circuit boards, components and added labour.

Credit: PWB Interconnect Solutions Inc.

Reliability of Stacked Microvia

The Printed Circuit Board industry has seen a steady reduction in pitch from 1.0mm to 0.4mm; a segment of the industry is even using or considering a 0.25mm pitch. This has increased the use of stacked microvias in these designs. The process of stacking microvias has been practiced for several years in handheld devices; however, the devices generally do not operate in harsh conditions. Type 1 and Type 2 microvias have been tested over the years and have been found to be very reliable. We do not have enough test data for 3 and 4 stack microvias when placed on and off buried via. The main objective of this study was to understand the reliability of 3 and 4 stack microvias placed on and off a buried via.

Credit: Firan Technology Group

Influence of Plating Quality on Reliability of Microvias

Advances in miniaturized electronic devices have led to the evolution of microvias in high density interconnect (HDI) circuit boards from single-level to stacked structures that intersect multiple HDI layers. Stacked microvias are usually filled with electroplated copper. Challenges for fabricating reliable microvias include creating strong interface between the base of the microvia and the target pad, and generating no voids in the electrodeposited copper structures. Interface delamination is the most common microvia failure due to inferior quality of electroless copper, while microvia fatigue life can be reduced by over 90% as a result of large voids, according to the authors' finite element analysis and fatigue life prediction. This paper addresses the influence of voids on reliability of microvias, as well as the interface delamination issue.

Credit: CALCE Center for Advanced Life Cycle Engineering

The Proximity of Microvias to PTHs And Its Impact On The Reliability

High Density Interconnect (HDI) technology is fast becoming the enabling technology for the next generation of small portable electronic communication devices. These methods employ many different dielectrics and via fabrication technologies. In this research, the effect of the proximity of microvias to Plated Through Holes (PTHs) and its effect on the reliability of the microvias was extensively evaluated. The reliability of microvia interconnect structures was evaluated using Liquid-To-Liquid Thermal Shock (LLTS) testing (-55oC to +125oC). Comprehensive failure analysis was performed on microvias fabricated using different via fabrication technologies.

Credit: Universal Instruments Corporation

See Forum results for related keywords - reliability microvia : 21

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█  Printed Circuit Board Assembly & PCB Design Forum

Router bit for cutting aluminum PCB -- We been using the Sayaka SAM-CT23Q machine to depanel PCB, it was fine. But now, we have to depanel the Aluminum PCBs the current bits from IMPEC we are using are not strong enough (1.5x8.0 diamond downcut). Need to find much strong bit or bits designs for cutting aluminum material. Any helpful tips would be apricated.

Views: 6070

Business for sale -- Printed circuit board assembly business in private business park for sale. An entire shop including surface mount pick and place machines, reflow oven, stencil printer, wave solder machine, in line washer, work stations with solder stations, hand tools, magnifying lights, IC, Radial, and axial prep machines, complete office with desks, file cabinets, conference table and chairs, kitchen equipment includes range, sink, refrigerator and microwave. Facility includes two rest rooms. Excellent opportunity for a start-up. Call:503-332-4726 or

Views: 424

Search the PCB Assembly Forum Visit the PCB Assembly Forum...

█  SMT, PCB Electronics Assembly Manufacturing News

ZESTRON Academy to Host FREE "Surface Cleanliness Assessment" Webinar

ZESTRON is pleased to announce that it will host a webinar titled "Surface Cleanliness Assessment" on Tuesday, July 26th, from 11:00 AM to 12:00 PM EDT. This is the fifth installment of the ZESTRON Academy 2022 Cleaning Webinar Series and will be presented by our industry expert, Naveen Ravindran, M.S.Ch.E, M.S.Ch.E, Application Engineer....

ZESTRON Americas

Economic Growth Projections Lowered for United States, Europe and China

Outlook influenced by growing recession uncertainties, rising prices and COVID lockdown policies in China...

Association Connecting Electronics Industries (IPC)

Innovative Circuits Arizona Installs New Assure Pro Intelligent X-ray Component Counter

Nordson TEST & INSPECTION, a division of the Nordson Corporation (Nasdaq: NDSN), is pleased to announce that Innovative Circuits Arizona (ICA) has purchased an Assure™ Pro intelligent X-ray component counter. The company recently installed the system at its facility in Gilbert, AZ....

Nordson Corporation

Nordson - Assure Pro Intelligent X-ray Component Counter

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█  SMT / PCB Products & Services



ICT Acrab 350 Wave Soldering Machine

Wave Soldering


Cleaning Agents

Cleaning Agents

ZESTRON Americas

Selective Soldering

Pillarhouse Jade Handex

Selective Soldering

Pillarhouse USA


Purbest - Hydro-Clean LDS Cleaning Machine

Cleaning Equipment

Purbest Tech


PCB Inspection




Unisoft ProntoPLACE SMT & Thru-hole Software


Mark 7 Series Reflow Oven




Catalina Full-featured Benchtop Dispenser

GPD - Catalina Benchtop Dispenser


GPD Global

View More New Electronic Manufacturing Products...

EPTAC - Your 2021 IPC Training Schedule

█  SMT / PCB Assembly Equipment Auctions

Currently, no featured auctions are on SMTnet

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█  Electronic Equipment Mart

MART - Used Electronic Assembly Machines For Sale


 Digital Test MTS-505 Condo II

AOI / Automated Optical Inspection

Baja Bid


 Lewis & Clark Viscom S3088  AOI

AOI / Automated Optical Inspection

Lewis & Clark


World Equipment Source - YesTech YTV-2050 AOI

AOI / Automated Optical Inspection

World Equipment Source, LLC


AllSurplus Panasonic NPM-W P&P

Pick and Place/Feeders



 SMTUnion - Panasonic NPM-W2 Chipshooter

Pick and Place Equipment/Feeders


P&P / Feeders

KD Electronics - Assembleon AX201

Pick and Place/Feeders

KD Electronics

View More Used Equipment For Sale... Send a RFQ to Equipment Suppliers ....

MART - Used PCB Assembly Equipment Wanted To Buy


KD Electronics Agilent 3070

In-Circuit Testers

KD Electronics


Baja Bid - Mydata SMT Placement Machine

Pick & Place /Feeders

Baja Bid


World Equipment Source Assembleon MG-1R

Pick & Place/Feeders

World Equipment Source, LLC


Lewis & Clark Agilent 3070

In-Circuit Testers

Lewis & Clark

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█  Electronics Manufacturing & Assembly Events Calendar


Wisconsin Chapter: PCB Workshop and PCB Plant Tour | July 13


Multi Chapter/Continent Webinar Series: Thermal Interface Solutions (Presented by Empire Ch.) | July 15


Surface Cleanliness Assessment July 26TH | July 26


Queretaro Expo & Tech Forum | August 18



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█  Electronics Manufacturing Training Courses & PCB Assembly Training


IPC Certification

Soldering & Rework

PCB Design

Electronics Assembly

Electronics Inspection

Online Training


 EPTAC - Your 2021 IPC Training Schedule

Blackfox - Online IPC Training & Certification - Now open for limited in-person training

TRAINING - Electronics Manufacturing and PCB Assembly Training Courses

IDEA-STD-1010 Essentials For Counterfeit Component Identification Online Live

New Hampshire, Manchester

Aug. 01 to Aug. 02, 2022

EPTAC Corporation

Counterfeit Components Workshop Online Live Training

New Hampshire, Manchester

Aug. 03, 2022

EPTAC Corporation

Component Identification Online Live Certification

New Hampshire, Manchester

Oct. 28, 2022

EPTAC Corporation

TRAINING - PCB Inspection Electronics Manufacturing Training Courses

SMT Processes Certification Course - Chihuahua

Alabama, Mexico, To Be Determined

Aug. 23 to Aug. 25, 2022

Surface Mount Technology Association (SMTA)

SMT Processes Certification Course - Guadalajara

Alabama, Mexico, Guadalajara, Jalisco

Sep. 19 to Sep. 21, 2022

Surface Mount Technology Association (SMTA)

610 Interactive Inspection Lab

Connecticut, Watertown

Oct. 07, 2022

EPTAC Corporation

TRAINING - PCB Rework and Hand Soldering Training Courses

Customizable Basic Hand Soldering

Arizona, Phoenix

Aug. 29 - Aug. 31, 2022

Sep. 19 - Sep. 21, 2022

Blackfox Training Institute, LLC

Hand Solder Rev 8 Certification Course

California, Anaheim

Nov. 28 to Dec. 02, 2022

EPTAC Corporation

TRAINING - Online Electronics Manufacturing and Assembly Training Courses

IPC J-STD-001 Trainer (CIT) Certification Online Live Training Course


EPTAC Corporation

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


ACI Technologies, Inc.

Live Online Training - IPC/WHMA-A-620 Trainer (CIT) Certification Training Course


ACI Technologies, Inc.

Live Online Training - IPC-A-610 (CIT) Recert.


ACI Technologies, Inc.

Reflow Soldering 101 Training Course


Surface Mount Technology Association (SMTA)

Visit All Electronics Manufacturing Training Courses...

█  Electronics Manufacturing & PCB Assembly Jobs

CAREER CENTER - Job Needs & Wants

JOBS - Post your job openings now

Lead Application Laboratory Technician

Manassas, VA


Field Service Engineer

Florham Park, NJ

Heller Industries Inc.

SMT Process Engineer

Milwaukee, WI

Cree Lighting

Soldering Technician, Touch-up for PCBAs

Santa Cruz, CA

Dynamic Engineering

Business Development Sales Manager, Microelectronics

Suwanee, GA

MacDermid Alpha Electronics Solutions


Nashville, NC


RESUMES - Post your resume now

Posiition: Assembly Operator

Currrent Location: India, Trivandrum

Summary of Qualifications: Reads instructions, such as work orders, drawing, and wire lists to determine materials needed and sequence of assembly, Manual Hand tool using for Wire cutting, stripping, crimping. Soldering, Splicing, Assembling PCB Boards, Boot Shrinking, Heat Shrink coating, Potting,5S Trained]

Posiition: Engineer

Currrent Location: India, Palakkad

Summary of Qualifications: I had 4 years experience 3 years in SMT Field and 1 year in Stock Market I have well experience in SMT process and machine Knowledge personally I have well knowledge on reflow, SPI,DEK AOI I can handle the process related issues and tackle the situation

Post your resume on SMTnet

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█  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

IPC Logo

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

NEW Fully featured benchtop dispenser - GPD Global

HELLER - Choose an Oven for Your Reflow Needs

Surface Cleanliness Assessment - ZESTRON Webinar July 26th

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

Software for PCB Manufacturing - Unisoft

EPTAC - Your 2021 IPC Training Schedule

Purbest ��� LTS Batch PCB Cleaner

Pillarhouse Jade Handex - Lean shop selective soldering - Get high-speed flexible throughput at minimal cost.

SMTUnion - SMT manufacturing cost reduction strategies

BlackFoxOnline IPC Training & Certification - Now open for limited in-person training

X-Tech Auctions ��� Contact Us

Sell your surplus machinery!!! We buy all types of Fabrication, CNC machines, and More. Contact Tom@ for more details.

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