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SMTnet Express, February 29, 2024, Subscribers: 25,362, Companies: 12,025, Users: 28,728

█ Electronics Manufacturing Technical Articles

Cracks in ceramic chip capacitors can be introduced at any process step during surface mount assembly. Thermal shock has become a "pat" answer for all of these cracks, but about 75 to 80% originate from other sources. These sources include ...

Credits: AVX Corporation

Flex Crack Mitigation

As part of continuous process improvement at KEMET, most failure modes caused by the capacitor manufacturing process have been systematically eliminated. Today these capacitor manufacturing-related defects are now at a parts per billion (PPB) level. Pareto analysis of customer complaints indicates ...

Credits: KEMET Electronics Corporation

Analysis of Interfacial Cracking in Flip Chip Packages With Viscoplastic Solder Deformation

This paper examines the modeling of viscoplastic solder behavior in the vicinity of interfacial cracking for flip chip semiconductor packages. Of particular interest is the relationship between viscoplastic deformation in the solder bumps and any possible interface cracking between the epoxy underfill layer and the silicon die. A 3-D finite element code, developed specifically for the study of interfacial fracture problems, was modified to study how viscoplastic solder material properties would affect fracture parameters such as strain energy release rate and phase angle for nearby interfacial cracks. Simplified twolayer periodic symmetry models were developed to investigate these interactions. Comparison of flip chip results using different solder material models showed that viscoplastic models yielded lower stress and fracture parameters than time independent elastic-plastic simulations. It was also found that adding second level attachment greatly increases the magnitude of the solder strain and fracture parameters. As expected, the viscoplastic and temperature dependent elastic-plastic results exhibited greater similarity to each other than results based solely on linear elastic properties. !DOI: 10.1115/1.1649242"

Credit: Lehigh University

Cracking Problems in Low-Voltage Chip Ceramic Capacitors

Cracking remains the major reason of failures in multilayer ceramic capacitors (MLCCs) used in space electronics. Due to a tight quality control of space-grade components, the probability that as manufactured capacitors have cracks is relatively low, and cracking is often occurs during assembly, handling and the following testing of the systems. Majority of capacitors with cracks are revealed during the integration and testing period, but although extremely rarely, defective parts remain undetected and result in failures during the mission. Manual soldering and rework that are often used during low volume production of circuit boards for space aggravate this situation. Although failures of MLCCs are often attributed to the post-manufacturing stresses, in many cases they are due to a combination of certain deviations in the manufacturing processes that result in hidden defects in the parts and excessive stresses during assembly and use. This report gives an overview of design, manufacturing and testing processes of MLCCs focusing on elements related to cracking problems. The existing and new screening and qualification procedures and techniques are briefly described and assessed by their effectiveness in revealing cracks. The capability of different test methods to simulate stresses resulting in cracking, mechanisms of failures in capacitors with cracks, and possible methods of selecting capacitors the most robust to manual soldering stresses are discussed.

Credit: NASA Office Of Safety And Mission Assurance

Avoidance of Ceramic-Substrate-Based LED Chip Cracking Induced by PCB Bending or Flexing

Printed circuit board (PCB) bending and/or flexing is an unavoidable phenomenon that is known to exist and is easily encountered during electronic board assembly processes. PCB bending and/or flexing is the fundamental source of tensile stress induced on the electronic components on the board assembly. For more brittle components, like ceramic-based electronic components, micro-cracks can be induced, which can eventually lead to a fatal failure of the components. For this reason, many standards organizations throughout the world specify the methods under which electronic board assemblies must be tested to ensure their robustness, sometimes as a pre-condition to more rigorous environmental tests such as thermal cycling or thermal shock.

Credit: Cree Lighting

Solder Crack Counter Measures

This page introduces major causes and countermeasures of solder crack in MLCCs (Multilayer Ceramic Chip Capacitors). Major causes of solder cracks Solder cracks on MLCCs developed from severe usage conditions after going on the market and during manufacturing processes such as soldering. Applications and boards that specially require solder crack countermeasures Solder cracks occur mainly because of thermal fatigue due to thermal shock or temperature cycles or the use of lead-free solder, which is hard and fragile.

Credit: TDK - Lambda Americas

RESULTS of Searches for related keywords - "chip cracking" (161)

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█ Printed Circuit Board Assembly & PCB Design Forum

Flux on the body of SMT components -- Hello all, I have a flux over components that affects AOI results in reading the symbols on top of it. What would you recommend to minimize this effect?

Solder paste storage -- We know that solder pastes can be stored for up to 2 weeks at room temperature. If we return them to the refrigerator after 1 week of storage at room temperature, does the time reset, or can we keep them for the remaining week at room temperature? Another consideration: What should we do if there isn't enough time to wait for the warm-up after refrigeration?

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█ SMT, PCB Manufacturing Companies - Industry Directory

NEWEST SUBSCRIBERS

Rehm Thermal Systems - As a manufacturer of reflow soldering systems with convection or condensation and drying and coating systems, Rehm Thermal Systems has been producing energy-efficient manufacturing equipment for the electronics and photovoltaics.

Electromechanicals Distributor - Electromechanical Distribution is an online purchasing platform for controllers, motors, relay sockets, switches, and other various items that are crucial for many industries and applications.

Diamond Microwave Chambers - DMC manufactures & supplies RF Shielded Enclosures, anechoic chambers, RF absorbers, and HEMP filters.

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█ SMT, PCB Electronics Assembly Manufacturing Industry News

HELLER Convenes a Successful 2024 Sales Kickoff Meeting, Setting the Stage for a Strong Year Ahead HELLER, a leading provider of reflow soldering equipment, concluded its 2024 Sales Kickoff Meeting in Suwon, South Korea on a high note. The meeting brought together sales representatives from all branches and subsidiaries to discuss the company's unified goals and objectives for the year ahead, and to equip them with the tools and knowledge necessary to achieve success.... Heller Industries Inc.
Selective Wave Soldering Machine Industry-Leading Technology Explore the technical prowess of I.C.T's Selective Wave Soldering Machines, boasting advanced features like precise flux application and innovative preheating systems. Discover how these machines redefine efficiency and reliability in electronic assembly.... I.C.T ( Dongguan ICT Technology Co., Ltd. )
IPC White Paper Emphasizes the Critical Importance of Data Analytics for the Electronics Manufacturing Process The increasing complexity of electronics manufacturing requires embracing data analytics to manage electronics factories, according to a new white paper from IPC's Chief Technologist Council (CTC), Outlook for Data Analytics in the Electronics Manufacturing Industry.... Association Connecting Electronics Industries (IPC)

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█ SMT / PCB Products & Services

NEW SMT / PCB EQUIPMENT & SERVICES - For Sale

PCB ASSEMBLY

PCB Fab & Assembly

Imagineering

REFLOW OVEN

Voidless / Vacuum Reflow Soldering Oven

Heller

PCB DISPENSING

Island Series Table Top Dispensers

GPD Global

Printing

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

Dongguan I.C.T

SELECTIVE SOLDERING

Pillarhouse Jade Handex

Pillarhouse USA

INSPECTION

MIRTEC GENESYS-PIN - 3D AOI for PIN inspection

MIRTEC Corp

Software

Unisoft ProntoAOI - AOI Machines Programming Software

UNISOFT Corporation

VIEW MORE NEW PRODUCTS...

█ SMT / PCB Assembly Equipment Auctions

AUCTION | Large SMT, Test Equipment, etc Liquidation Auction!

AUCTIONEER | XTECH Auctions - Where Technology Sells

TYPE | Online Auction

FEATURING | Liquidation of various manufacturing equipment, tools, test equipment, electronics, office supplies, etc.

SCHEDULE | Tue, Mar 4 to Thu, Mar 6, 2024

Starts: Mar 4, 2024 AT 10 AM PST

Closes: Mar 6, 2024 AT 10 AM PST

LOCATION | San Diego, CA

█ Electronic Equipment Market

MARKET - Used Electronic Assembly Machines For Sale

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

Gen'l Purpose T&M

Zeiss LSM-880 Laser Scanning Microscope

World Equipment Source, LLC

Adhesive Dispensers

Musashi FAD2500

KD Electronics Ltd.

MORE EQUIPMENT & PARTS...

SUBMIT YOUR RFQ ....

MARKET - Used PCB Assembly Equipment Wanted To Buy

WIRE STRIPPERS

Autosplice SAS/2

Baja Bid - Autosplice SAS/2

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

Counterfeit Electronics & Materials Symposium - UK | March 5 to 6

SMTA

Capital Expo & Tech Forum | March 7

SMTA

Wine Down Wednesday: A Texpat Down Under- The Good, the Quirky, & the Utterly Ridiculous | March 13

SMTA

█ Electronics Manufacturing Training Courses & PCB Assembly Training

FIND TRAINING FOR:

IPC Certification

Soldering & Rework

PCB Design

Electronics Assembly

Electronics Inspection

Online Training

TRAINING - PCB Inspection Electronics Manufacturing Training Courses

IPC-A-610 Specialist Interactive PCB Inspection Lab (CIS or CIT Option) Certification Training Course

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

EPTAC Hand Soldering Certification Training Course

Multiple dates and locations. Check the link for details

EPTAC Corporation

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)

MORE TRAINING COURSES...

█ Electronics Manufacturing & PCB Assembly Career Center

Job Needs & Wants

JOBS

YOUR job openings

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. )

SMT Sales Manager

Penang, Pulau Pinang, Malaysia

Rehm Thermal Systems

Director of Business Development

Tampa, Florida, USA

Spartronics

Senior Quality Engineer

Strongsville, Ohio, USA

Spartronics

Program Manager

Strongsville, Ohio, USA

Spartronics

Sr Program Manager of Product Transfer

Brooksville, Florida, USA

Spartronics

Site General Manager

Williamsport, Pennsylvania, USA

Spartronics<

Installation Service Technician

Centennial, Colorado, USA

Vortex Industries

AOI Engineer

Hai Phong, Vietnam

Dongguan RuiHengHuaTai Electronic Co., Ltd

SMT Electronics Technician

Manchester, New Hampshire, USA

Intelligent Manufacturing Solutions

SMT Process Technician III

Racine, Wisconsin, USA

Cree Lighting

Experienced SAKI AOI programmer

All US, USA

AirDataIOT,LLC

Engineering Project Manager

Strongsville, Ohio, USA

Spartronics

Senior Quality Engineer

Williamsport, Pennsylvania, USA

Spartronics

Senior Systems Engineer

Strongsville, Ohio, USA

Spartronics

Procurement Specialist

Brooksville, Florida, USA

Spartronics

Buyer/Planner

Williamsport, Pennsylvania, USA

Spartronics

Corporate Director of Quality

Williamsport, Pennsylvania, USA

Spartronics

Automotive service Technician

Golden, CO, USA

Engage2excel

Program Manager

Williamsport, Pennsylvania, USA

Spartronics

RESUMES

YOUR resumes

0 Electronics Manufacturing & PCB Assembly Resumes

YOUR next job ... YOUR next employee ...

█ 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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