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SMTnet Express April 11, 2013, Subscribers: 26336, Members: Companies: 13353, Users: 34557

Technical Library

No-Clean Flux Residue and Underfill Compatibility Effects on Electrical Reliability

by: Todd L Kolmodin, VP Quality; Indium Corporation of America

No-clean soldering processes dominate the commercial electronics manufacturing world. With the explosion of growth in handheld electronics devices, manufacturers have been forced to look for ways to reinforce their assemblies against the inevitable bumps and drops that their products experience in the field. One method of reinforcement has been the utilization of underfills to "glue" certain surface mount devices (SMDs) to the PCB. This provides additional mechanical strength over and above the soldered connections. Bumped SMDs attached to the PCB with a no-clean soldering process offer the unavoidable scenario of the underfill coming in contact with a flux residue. This may or may not create a reliability issue.

This paper will discuss an experiment designed to measure the electrical reliability of various combinations of underfill and no-clean flux residues, as measured with J-STD-004B SIR (IPC-TM-650

First published in the 2012 IPC APEX EXPO technical conference proceedings.

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Forum search results for related keywords: underfil, reliability, no-clean solder paste

SMT / PCB Products

S-920N Series Scalable Dispensers
S-920N Series Scalable Dispensers for Microelectronics Packaging

For high-volume manufacturing...

by: Asymtek

VIGON® N 600
PCB Defluxing Agent
VIGON N 600 Cleaning and Defluxing Agent

Water-based and biodegradable...


Rework System
EXPERT 10.6 Automated Rework System

Combines IR radiation with convection...

by: Martin GmbH

BGA Solder
BGA Solder Spheres

Exceed both the IPC and MIL standards...


iico Pick & Place System (new!)
iico Pick & Place System

For the latest electronic production needs...

by: Europlacer

Stencil Printer
SP700avi Inline Stencil Printer

Utilising the most advanced drive...

by: Speedprint

SLM100 Series
LED Mounter
SLM100 Series LED mounter

The World's First LED Mounter!...


Mark5 Series -
Reflow System
The Mark III Reflow System

Up to 40% reduction in nitrogen consumption...

by: Heller

SMT / PCB Equipment Auctions

X-Line - SMT Equipment Auctions

Surplus SMT and Process Equipment to Ongoing Operations

April 15 - 16 | auction by: X-Line Asset Management

Electronic Equipment Mart

SRT Summit 750
Rework Station
SRT Summit 750 Rework Station

IBE SMT Equipment

all marketplace listings

Screen Printer
DEK 248CE Screen Printer


all marketplace listings

DIT-MCO 8105
In-Circuit Tester
DIT-MCO 8105 In-Circuit Tester


all marketplace listings

Pillarhouse Topaz E-300
Wave Solder
Pillarhouse Topaz E-300 Wave Solder


all marketplace listings

Events Calendar

Huntsville Expo & Tech Forum
April 16

Printed Electronics Europe 2013
April 17 - 18

Career Center


Mfg Engineering Technician

San DIego, CA, USA | Cal Comp Electronics

SMT Operator and other openings

Lincoln, AR, USA | Electronic Manufacturing Solutions, Inc.

Manufacturing Engineering Manager

Dayton, OH, USA | Projects Unlimited Inc


SMT Production Engineer

Muzzaffarnagar, India

Field Service Engineer

Tucson, Arizona Texas, Florida, Georgia, Alabama, USA

12 Years experience in Equipment, Manufacturing and Technical Support

Open to be relocated

Industry Associations Events


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

Next Event: Webtorial: Improving SMT Stencil Printing Yields - April 18


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

Next Event: IPC/FED Conference on Embedded Components - June 4 - 5

Technical Editor - Davef (submit your technical articles)

Newsletter Editor - Anna Girouard, 98 Elm Street, Portland, Maine 04101 USA, Tel.207-780-0887.

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Used PCB Assembly Equipment - CE Exchange

Software for PCB Manufacturing - Unisoft

PCB Testers - Digitaltest

Custom SMT Equipment Nozzles - Count on Tools

Used SMT Equipment - IBE

PCB Equipment Auctions - X-Line

SP700avi Inline Stencil Printer - Speedprint

ii-Feed tape feeding solution for Europlacer machines

SMT Solder Products - Amtech

Mark5 SMT Reflow Oven - Heller

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