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SMTnet Express, December 29, 2016, Subscribers: 30,326, Companies: 15,062, Users: 41,660

Technical Library

Partially-Activated Flux Residue Impacts on Electronic Assembly Reliabilities

Yanrong Shi, Ph.D., Kyle Loomis, Jennifer Allen, Bruno Tolla, Ph.D.; Kester

The reliabilities of the flux residue of electronic assemblies and semiconductor packages are attracting more and more attention with the adoption of no-clean fluxes by majority of the industry. In recent years, the concern of "partially activated" flux residue and their influence on reliability have been significantly raised due to the miniaturization along with high density design trend, selective soldering process adoption, and the expanded use of pallets in wave soldering process. When flux residue becomes trapped under low stand-off devices, pallets or unsoldered areas (e.g. selective process), it may contain unevaporated solvent, "live" activators and metal complex intermediates with different chemical composition and concentration levels depending on the thermal profiles. These partially-activated residues can directly impact the corrosion, surface insulation and electrochemical migration of the final assembly.

In this study, a few application tests were developed internally to understand this issue. Two traditional liquid flux and two newly developed fluxes were selected to build up the basic models. The preliminary results also provide a scientific approach to design highly reliable products with the goal to minimize the reliability risk for the complex PCB designs and assembly processes.

This paper was originally published by SMTA in the Proceedings of SMTA International

read article »

Forum search results for related keywords: ECM, flux residue, low stand-off, selective soldering.

SMT / PCB Products

PCB ASSEMBLY EQUIPMENT

Reflow

1ClickSMT

Material Handling/Storage

Europlacer

Printing

Speedprint

Dispensing

GPD Global

Reflow

Heller

Pick & Place

Essemtec

PCB CLEANING

PCB TEST & INSPECTION EQUIPMENT

Cleaning

ZESTRON

Cleaning

Kyzen

Inspection

Mirtec

Inspection

ASC International

PCB REWORK

PCB SOFTWARE

Rework

Metcal

Rework

BEST, Inc.

Wave Soldering

KIC

Software

JTAG

SMT / PCB Equipment Auctions

Complete Liquidation of Surface Mount Operations

Jan. 9 - 11 | X-Line Asset Management

Electronic Equipment Mart

Pillarhouse Jade S-200

Selective Solder

Capital Equipment Exchange

DEK Horizon 03i

Screen Printing Equipment

X-Line Asset Management

YesTech YTV-BX Table Top AOI

X-Ray Equipment

IBE SMT Equipment

Vitronics 6723CC

Wave Solder Equipment

Recon Inc

Agilent Technologies 3070

Test Equipment

Baja Bid

PCB Conveyors

Conveyors

JMW Enterprises

Events Calendar

Pan Pacific Microelectronics Symposium 2016

Conference | February 6 - 9 | SMTA

electronica China 2017

Conference, Trade Show/Exhibition | March 16 - 17 | Messe M�nchen GmbH

NEPCON JAPAN

Trade Show/Exhibition, Conference | January 18 - 20 | Reed Exhibitions

Training Courses

Find training training courses in your area for IPC certification, PCB assembly, rework, inspection and other electronics manufacturing processes »

Career Center

District Sales Manager - Electronic Material

Atlanta, GA

Alpha Assembly Solutions

Regional Sales Manager for Latin America

Guadalajara or US Border

PACE Worldwide

Technical Sales Engineer

San Jose, CA, USA

YINCAE Advanced Materials

Industry Associations Events

SMTA

SMTA - Surface Mount Technology Association 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

Event: Rocky Mountain Expo & Tech Forum - Jan. 19

IPC

IPC - Association Connecting Electronics Industries 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 Programs | Standards & Publications - Online Store

Event: IPC APEX EXPO 2017 - Feb. 14 - 17

Technical Editor - Davef (submit your technical articles)

Newsletter Editor - Anna Girouard

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

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SMT Inventory Offered Two Ways: 'As Is' or 'Production Ready' - CE Exchange

Custom SMT Nozzles and Tools - Count on Tools

Quality Pre-Owned SMT Eequipment - Robo-Tek

Why Use Plasma Treatment Prior To Conformal Coating. Download the 'The Effects of Plasma Treatment Prior to Conformal Coating' White Paper.

Vacuum Tweezers - pick up small components with ease

VisionPro Series Bench Top 3D SPI - the ultimate in flexibility

PCB Cleaning products - Zestron

HANDY series Automatic soldering robots - 1 Click SMT

Soldertools.net - Rework Tools

Fluid DISPENSING pumps for integration into your system - GPD Global

KIC - Making Reflow Ovens Smarter

NEW Essemtec Fox can have up to 180 feeder lanes, needs only 1sqm of floor space and can accept PCB's of up to 406 x 305 mm.

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

Used SMT Equipment - IBE

Speedprint SP700avi inline SMT screen printer

Software for PCB Manufacturing - Unisoft

All you want to know about BOUNDARY-SCAN

Buy an MX-5210 roldering and rework station, Get FREE tweezer upgrade kit - Offer ends Dec. 31, 2016

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