Express Newsletter

The SMTnet Express newsletter is sent weekly to over 25,000 subscribers.

SMTnet
»
Express Newsletter

SMTnet Express, March 7, 2024, Subscribers: 25,376, Companies: 12,030, Users: 28,745

█ Electronics Manufacturing Technical Articles

Conductive Anodic Filament: Mechanisms and Affecting Factors

Conductive anodic filament (CAF) formation, a failure mode in printed wiring boards (PWBs) that are exposed to high humidity and voltage gradients, has caused catastrophic field failures. CAF is an electrochemical migration failure mechanism in PWBs. In this article, we discuss CAF, the factors that enhance it, and the necessary conditions for its occurrence. ... Potential reasons for CAF enhancement solutions are discussed, and possible directions in which to develop anti-CAF materials are proposed.

Credits: The Hong Kong Polytechnic University

Conductive Anodic Filament Growth Failure

With increasing focus on reliability and miniaturized designs, Conductive Anodic Filament (CAF) as failure mechanism is gaining a lot of attention. Smaller geometries make the printed circuit board (PCB) susceptible to conductive anodic filament growth. Isola has carried out work to characterize the CAF susceptibility of various resin systems under different process and design conditions. Tests were carried out to determine ...

Credits: Isola Group

Conductive Anodic Filament Failure: A Materials Perspective

Conductive anodic filament (CAF) formation was first reported in 1976.1 This electrochemical failure mode of electronic substrates involves the growth of a copper containing filament subsurface along the epoxy-glass interface, from anode to cathode. Despite the projected lifetime reduction due to CAF, field failures were not identified in the 1980s. Recently, however, field failures of critical equipment have been reported.

A thorough understanding of the nature of CAF is needed in order to prevent this catastrophic failure from affecting electronic assemblies in the future. Such an understanding requires a comprehensive evaluation of the factors that enhance CAF formation. These factors can be grouped into two types: (1) internal variables and (2) external influences. Internal variables include the composition of the circuit board material, and the conductor metallization and configuration (i.e. via to via, via to surface conductor or surface conductors to surface conductors). External influences can be due to (1) production and (2) storage and use. During production, the flux or hot air solder leveling (HASL) fluid choice, number and severity of temperature cycles, and the method of cleaning may influence CAF resistance. During storage and use, the principal concern is moisture uptake resulting from the ambient humidity.

This paper will report on the relationship between these various factors and the formation of CAF. Specifically, we will explore the influences of printed wiring board (PWB) substrate choice as well as the influence of the soldering flux and HASL fluid choices. Due to the ever-increasing circuit density of electronic assemblies, CAF field failures are expected to increase unless careful attention is focused on material and processing choices.

Credit: Georgia Institute of Technology

Conductive Anodic Filament (CAF) Formation: A Potential Reliability Problem for Fine-Line Circuits

Outline * Introduction & Background * Factors Affecting CAF Formation * CAF Formation ** Catastrophic Field Failure of Military Hardware ** Laboratory Experiments * Conclusion

Credit: Georgia Institute of Technology

Material & Process Influences on Conductive Anodic Filamentation (CAF)

HISTORY: * In the late 1970s an abrupt unpredictable loss of insulation resistance was observed in PCBs, which were subject to hostile climatic conditions of high relative humidity and temperature while having an applied voltage. * The loss of resistance, even leading to a short circuit was observed to be due to the growth of a subsurface filament from the anode to the cathode. * The term "Conductive Anodic Filamentation" (CAF) was coined.

Credit: Isola Group

RESULTS of Searches for related keywords - "Filament" (26)

VIEW MORE PAPERS...

SUBMIT YOUR PAPER...

█ Printed Circuit Board Assembly & PCB Design Forum

Topaz Xi ll ERROR EA100 EMERGENCY STOP -- Strange error, I have looked at the schematic and checked all of the e-stop switches and they're good. The machine isn't connected to anything, but air and power. Has anyone else seen anything like this? 1. When pressing the active button it beeps and lights up. 2. When pressing the Ready button there is a faint beep, but it doesn't light up. All of the menus are grayed out I can't warm up the machine.

Problem with MPM ACCUFLEX -- Hi everyone! We have a difficulty with the camera, the light on it is not activating when it starts to read the views either PCB or ST. We made a bridge directly a 12v signal to each bulb and they turn on and give image on the MPM. Has anyone had this same failure? Where can we check for a failed component? Does anyone have the wiring diagrams for this machine to share? I am looking for any help I can get, I am in the middle of a bidding process and have not been able to fix this fault.

SEARCH THE FORUM

ADD YOUR THOUGHTS ...

█ SMT, PCB Manufacturing Companies - Industry Directory

NEWEST SUBSCRIBERS

Digitalshovel - we make datacenters for crypto mining

MONOTEST - industry, laboratory, test equipment and spare parts supplies

Xinshop ElectronicsXinshop Electronics - Xinshop Electronics Co., Ltd is a leading global trader and supplier of electronic components (Founded in 2012)

ADD YOUR COMPANY...

█ SMT, PCB Electronics Assembly Manufacturing Industry News

Introducing the High-Performance Plastic Junction Boxes for Demanding Environments Discover Mencom's TM Series plastic junction boxes, designed for superior protection in harsh industrial environments.... Mencom Corporation
Murray Percival Co Takes Texas: Showcasing Distribution at SMTA Dallas and Houston The Murray Percival Company is excited to announce its participation in the upcoming SMTA Dallas and Houston Expos & Tech Forums. This marks a significant milestone in Murray Percival's strategic expansion across the United States, reinforcing its commitment to bringing unparalleled supply solutions and legendary service to the PCB industry on a national scale.... Murray Percival
Registration Open for Electrical Wire Processing Technology Expo (EWPTE) 2024 Registration is now open for Electrical Wire Processing Technology Expo (EWPTE) an exclusive, free-of-charge* event for the electrical wire harness, wire, coil winding and cable processing industries, to be held at Baird Center May 14-16, 2024, in Milwaukee, Wis.... Association Connecting Electronics Industries (IPC)

ADD YOUR NEWS...

█ SMT / PCB Products & Services

NEW SMT / PCB EQUIPMENT & SERVICES - For Sale

PCB SOFTWARE

ProntoSELECTIVE-SOLDERING

Unisoft

PCB ASSEMBLY

PCB Fab & Assembly

Imagineering

PCB REFLOW OVEN

NEW! Mark 7 Series -
Reflow Oven

Heller

PCB DISPENSING

PCD Continuously Volumetric Dispense Pumps

GPD Global

Selective Soldering

Selective Wave Soldering Machine I.C.T-SS550

Dongguan I.C.T Technology

SELECTIVE SOLDERING

Pillarhouse Jade Handex

Pillarhouse USA

Inspection

CameraLink High Resolution Industrial Cameras

ISVI - Industrial Sensor Vision International Corporation

VIEW MORE NEW PRODUCTS...

█ SMT / PCB Assembly Equipment Auctions

AUCTION | NexGen Power Systems - Closure of Low-Volume Semiconductor & Metrology Fab

AUCTIONEER | The Branford Group

TYPE | Online Auction

DESCRIPTION | Closure of Low-Volume Semiconductor & Metrology Fab | Multi-Million Dollar Facility Investment

SCHEDULE | Mon, Mar 11 to Wed, Mar 13, 2024

OPENS | Monday, March 11, 2024 8:00 AM (EST)

CLOSES | Wednesday, March 13, 2024 11:00 AM (EST)

LOCATION | 50 Collamer Crossing Pkwy, East Syracuse, NY 13057

FEATURING |

Front-End Semiconductor: Aixtron Type AIX G5 HT TM MOVPE Planetary Reactor (2022) Veeco WaferStorm 3300 Model M3303-7 Wet Etching System (2021) Sigma SPTS/KLS fxP Physical Vapor Deposition System (PVD) Camtek Eagle T-i Advanced Automated Optical Inspection (AOI) System (2021) ECM Technologies Group Jipelec Jetfirst 300C Rapid Thermal Processing (RTP) Furnace (2022) Tencor Instruments KLA Surfscan 5500 (2020 Refurbished) ESI E3511 Asher (2020)

Back-End Semiconductor: Disco DGP8761 Fully Automatic Grinder/Polisher (2020) - 650 Wafers Processed! - SOLD Eaton Nova/Axcelis 8250HT Implant System Bristol 137 Optical Non-Contact Wafer Thickness Measurer (2) USI Ultron UH114-8 Tape Hugle Semicorp HS-1810 Die Matrix Expander (2022) SEC 3150 Wafer/Film Frame Tape Applicator (2020)

Metrology | Test: Keysight 4771A Series PCM Parametric Test System (2) 2017 Tokyo Seimitsu Acctetech UF200R Auto Wafer Probers Micromanipulator Prober with Keithley 4200A Parameter Analyzer Rudolph Research/AutoEL III SS292 Elipsometer Focused Test FTI-1000 Tester ProFilm 3D Microscope

Wet Process: MTS MicroTech IPA Gradient Dryer (2020) Kinetics 48" Front Access Wet Bench (2020) Sitek Process Solutions FLuorwave HTC 8030 Box Washer

Lab: Denton Desk V Vacuum System Allied High Tech Products TechPrep Polishing System Lindberg BlueM MO1440P3A-1 Mechanical Oven

IMPORTANT BIDDER REGISTRATION INFORMATION | All prospective bidders must be registered and approved no later than 24 hours prior to the bids closing. Upon registering you will receive information via email on how to become an approved bidder. All prospective bidders must post a 25% deposit of approximate planned spending budget or a minimum of $10,000.00 to be approved via wire transfer (no credits cards). Upon the conclusion of the auction all non-successful bidders will be returned their deposit via wire transfer within 48hrs., all deposits received from winning bidders will be applied towards their purchases. No exceptions will be made.

SEE MORE AUCTIONS...

█ Electronic Equipment Market

MARKET - 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

Board Cleaners

Aqueous Technologies Trident XLD

Baja Bid

P&P / FEEDERS

Panasonic NPM-W2

SMTUnion - Panasonic NPM-W2 Chipshooter

SMTUnion

PCB LABELING

Coherent Verdi V18 SOLID-STATE Diode-Pumped Laser

World Equipment Source - Coherent Diode-Pumped Laser

World Equipment Source, LLC

MORE EQUIPMENT & PARTS...

SUBMIT YOUR RFQ ....

MARKET - Used PCB Assembly Equipment Wanted To Buy

PCB TEST

Agilent 3070

KD Electronics Agilent 3070

KD Electronics

P&P /FEEDERS

Mydata SMT P&P

Baja Bid - Mydata SMT Placement Machine

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

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.

FEATURED SPONSORS
⇩