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PbFree HASL Kits Practical ComponentsPbFree HASL PCB Finish
Now Available! One of the most popular final finishes is known
as Hot Air Surface Leveling otherwise known as HASL. ...
www.pcbsino.com....practicalcomponents.com/boards/pcbHASLleadfreekit.htm
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PbFree PCB Assembly Printed Circuit Boards NexLogicNexlogic
is a premier provider for all PCB Design Services, PCB Fabrication,
and PCB Assembly Services. Our customers rely on us to handle
all the features ...
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PbFree Surface Finishes PbFree PCB FabricationSurface finishes
are important to Pbfree PCB fabrication because conductivity
of immersion silver and immersion gold is considerably higher
compared to the ...
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PbFree PCB Finishes for ICT Circuits AssemblyIn fact, the
yield strength of Pbfree solders is not significantly different
than their lead counterparts. PCB finishes are changing,
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Pbfree PCB finishes for ICT: new solders can mean new finishes
...Pbfree PCB finishes for ICT: new solders can mean new
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Lead free Test ROHS resource for pbfree pcbLeadfree test
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[XLS] AD9851 FS/PCB Rev. A(1.0) Evaluation Board PbFree
Bill of MaterialsFile Format: Microsoft Excel View as HTML
1, AD9851 FS/PCB REV. A(1.0) EVALUATION BOARD PbFree BILL
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Clare Lead Free PolicyIs this plating material compatible
with nonleadfree PCB assembly ... are not LeadFree/RoHS
compliant at the current time; they contain lead (Pb) on
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Pbfree Impact on PCB Purchasing Lead Free PCB PurchasingRather
than reinventing the wheel, we'll concentrate on basic information
that you, as a buyer or purchasing agent, can use to make
your life easier.
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[PDF] Microsoft PowerPoint Leadfree PCB EastFile Format:
PDF/Adobe Acrobat View as HTML
PCB Finishes for Leadfree. Hot Air Solder Level (HASL) Coatings.
Advantages ¨C Pure metal alloy should work with most.
PbFree alloy choices. ... PbFree HASL KitsPC Boards and
Kits
PC00940 Aegis Traceability & Control Validation Kit
Kit Identifier (component part/kit numbers)
AIM Print Test Board and Kit
PbFree HASL PCB Finish
Custom PC Practice Boards and Kits
CircuitCAM Software¡(ªàX,Aegis
Single Pack Hand Solder Kits
PC000 ZeroOhm SMD Resistor PCB/ Kit
PC003 Solder Practice PCB/Kit
PC005 BGA Variable Pitch and Array PCB/Kit
PC007 MLF? Test PCB/Kit
PC008 Solder Practice PCB/Kit
PC009 Mixed Technology PCB/Kit
PC011 BGA Fine Pitch PCB/Kit
SMTA Saber Evaluation PCB/Kit
PC012 BGA Global DaisyChain Test Kit
PC013 ThoughHole Solder Training Kit
PC014 IPC 9850 Attribute Defect Rate Kit
PC015 Rework Kits
PC016 IPC Compliant Hand Soldering Kit
PC020 Practical SMT Kit
PC200 PoP 14mm Board & Kit¡(ªàX,Amkor
PC200 PoP 12mm Board & Kit¡(ªàX,Amkor
WTK1 Terminal and Wire Kit
PC031 LeadFree Process Capability Validation Kit¡(ªàX,Cookson
Flip Chip Test Die Kits¡(ªàX,FlipChip Int'l
¦àP,ÌàPBGAPC Boards and Kits¡(ªàX,Tessera
Omni Training Kits
Laser Cut Metal Mask Stencils
FREE CATALOG
See our illustrated design guide/catalog for an extensive
list of dummy components, SMD production tools and equipment,
PCB practice kits and other products designed to save you
money and improve your process.
PbFree HASL PCB Finish Now Available!One of the most popular
final finishes is known as Hot Air Surface Leveling otherwise
known as HASL. A viable lead free HASL process utilizing
the Nihon Superior SN100CL lead free solder alloy is available.
Testing to date has shown that the SN100CL lead free HASL
process offers superior solderability to the final finishes
on the market today. All of the final finishes available
on the market today have both their merits and demerits.
Many in the board industry are concerned about switching
from HASL to a less forgiving final finish as they transition
to the up and coming lead free era. Our process should ease
these concerns. This process is also directed towards those
who are not completely satisfied with their current final
finish. There are two major lead free solder alloys on the
market today: SN100CL and the SAC alloy. The SN100CL nominal
composition is a stabilized eutectic tin copper . The SAC
305 alloy consists of tin, copper and 3% silver.
The Advantages of SN100CL LeadFree HASL:
A robust process.
Improved shelf life compared to 63/37 (2).
Minimal temperature increase in the solder pot (Solder pot
temp est.
485500¡(ãà°F).
No copper attack (e.g., copper traces, holes on circuit
board).
Minimal stainless steel attack. SAC 305 alloy rapidly attacks
Stainless Steel.
Superior wetting yielding a more uniform and flat surface.
Capable of handling very fine pitch due to excellent wetting.
Compatible with both conventional 63/37 and lead free final
assembly.
More economical (No Silver). PbFree Assembly
An ideal leadfree transition team has trained personnel
in purchasing, inventory management, fabrication and process
control. Purchasing and procurement specialists are versatile
enough to fully understand and track a variety of changing
conventions association with Pbfree assembly. Inventory
personnel understand differences between eutectic and leadfree
components. Particularly, they are attentive to the adverse
consequences of mistaking one for the other. They also maintain
stringent control over incoming vendor components from a
variety of supplier bases; and once in house, segregate
those components and maintain proper inventory of them.
There are differences between eutectic and leadfree assemblies,
not only in terms of different thermal profiles, inspection
and rework criteria, but also because leadfree assemblies
tend to have latent defects that are absent in eutectic
assemblies. One of those defects is ¡(°àh,whisker formation.¡(±à`,
This phenomenon is created when tin whiskers or electrically
conductive, hairlike structures grow outward from tin, zinc,
gold, cadmium, indium or silver.
Solder joint embrittlement is created over time as a result
of a latent defect. This is due to the absence of lead in
the joint, which makes the remaining alloy hard. Over time,
this hardening alloy can show signs of cracking and microcracking.
Signs of fatigue are more prevalent in PCBs subjected to
motion or vibrationbased applications. This latent defect
places greater pressures on process controls and require
tighter assembly rework and inspection tolerances.
Leadfree solder and assembly reliability is achieved if
trained specialists carefully implement several process
requirements. There are a number of variables that must
be taken into consideration to achieve leadfree solder joint
reliability. These include alloy melting temperature; alloy
wetting and surface tension properties; solder balling and
bridging potential increases; and cosmetic effects of flux
at higher reflow temperatures.RoHS LeadFree Test and Inspection
Legislation is driving the need for leadfree and environmentally
friendly material sets in the printed circuit board industry.
The RoHS (Restriction of Hazardous Substances) directive
commonly know as the 'leadfree' directive. This directive
restricts the usage of Lead, Mercury, Cadmium Hexavalent
chromium (Chromium VI or Cr6+), Polybrominated biphenyls
(PBB) , Polybrominated diphenyl ether (PBDE).
This new material set means questions about the reliability
of products, process issues, and many other considerations
that have been long established for tinlead solders. In
general leadfree is a less forgiving process, which means
that defect levels are likely to increase and the need for
inspection for process control and defect containment will
increase.
The creation of www.pcbsino.com....leadfreetest.com was
to help customers with gathering leadfree /RoHS data, paper/articles,
events, resources, etc. This website is a compilation of
what is happening in leadfree in the industry and is a great
resource for customers of all types. This valuable resource
is available as a free service to our valued customers and
to others with an interest in leadfree.
LeadFree News
A Study of LeadFree Wave Soldering
(AIM) As leadfree in wave soldering increases, questions
about copper dissolution into leadfree alloys have arisen.
This study explores this question and provides data and
discussion to support the industry issue.
Fragility of Pbfree Solder Joints
(SMTnet) Recent investigations have revealed that Pbfree
solder joints may be fragile, prone to premature interfacial
failure particularly under shock loading, as initially formed
or tend to become so under moderate thermal aging. This
study explores this in depth.
RoHS Compliance and Pbfree Capability: One in the Same?
(SMT) Though many in the industry would lead you to believe
that a RoHS compliant product ensure leadfree process capability,
in fact, nothing could be further from the truth. This paper
explores this question in detail.
Agilent statement on the Restriction of Hazardous Substances
(RoHS) Directive
(Agilent Technologies) Agilent Technologies provides a drawer
statement to customers on the RoHS situation.
China RoHS: Ready or not, it¡(¯s here
(Semiconductor International) Editorial style comments on
the China RoHS transition.
Featured LeadFree Links
RoHS Compliance
Speedline Technologies lead free Process / Application
Agilent Technologies lead free info
CALCE Lead Free Forum
Aim Solder lead free info
Pbfree.com
LeadFree Test and Inspection Products Auto. Dipping machine,
Pbfree Dipping machine, PCB Dipping ...Auto Soldering machine,
Pbfree Soldering machine, PCB Soldering machine, Lead free
Soldering pot, Soldering machine & Soldering pot Made
In Taiwan ...
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Science Links Japan | Pb free soldering technology in PCB
mountingTitle;Pb free soldering technology in PCB mounting.
Author;MIYAZAKI MAKOTO(Naganookidenki Jissogijutsukaihatsubu)
TAKEI TOSHIYASU(NSK Ltd.) ...
sciencelinks.jp/jeast/article/200408/000020040804A0261265.php
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[PDF] Test Probes in LeadFree Solder PCB ProcessesFile
Format: PDF/Adobe Acrobat View as HTML
New regulations will require the use of PbFree solder for
many assemblies by July 1, 2006. ... Test Probes in LeadFree
Solder PCB Processes. April, 2004 ...
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2 x 200g Solder Paste for PCB SMD Lead Pb Free eBay (item
...eBay: Find 2 x 200g Solder Paste for PCB SMD Lead Pb
Free in the Business Industrial , Manufacturing Metalworking
, Semiconductor PCB Equipment , PCB ...
IPC/JEDEC International Conference on Reliability, Rework,
and ...The special reliability threats to the solder attachments
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based on using leadfree solders ...
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PCB Packaging Hardware is leadfree., Bivar, Inc.With the
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[PDF] PbFree PCB Finishes for ICTFile Format: PDF/Adobe
Acrobat
PbFree PCB Finishes for ICT. New solders can mean new finishes.
How to decide which is best. FIGURE 1: A raw copper via
damaged after being hit with a ...
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[PDF] Pbfree Standards UpdateFile Format: PDF/Adobe Acrobat
View as HTML
PCB design. Many companies ask how IPC design standards
will address Pbfree soldering, particularly in the area
of SMT land patterns. The ...
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PbFree Process ImplementationHowever leadfree manufacturing
extends beyond the immediate aspect of substituting assembly
solders, there are related issues of compatible PCB finishes,
...
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[PDF] Pbfree Impact on PCB Purchasing WhitepaperFile Format:
PDF/Adobe Acrobat View as HTML
Basic tutorial on Pbfree requirements for PCB design, fabrication,
... So, it¡(¯sa good idea to get a sound understanding
of the Pbfree PCB design, ... Pbfree Impact on PCB Purchasing,
Part 1
Table of Contents
Defining EU Directive ¨C RoHS, WEEE PbFree
Basic tutorial on Pbfree requirements for PCB design, fabrication,
assembly, and procurement
Solder pastes, materials, surface finishes and cost
Questions to ask EMS providers and contract manufacturers
about Pbfree qualifications and costs (coming soon)
This page is part one of an article about the lead free
impact on PCB purchasing.
Preface
To date, volumes have been written about the European Union's
(EU) directive on Restrictions on Hazardous Substances (RoHS),
WEE, and requirements for leadfree (Pbfree) products. You
can go to virtually any search engine and put in the words,
"Pbfree requirements" or "RoHS" and
get a considerable amount of definitions, analysis, and
general articles.
So, rather than reinventing the wheel, we'll concentrate
on basic information you, as a buyer or purchasing agent,
can use to make your life easier. The following information
helps you to understand some of the key particulars involved
in selecting Pbfree PCBs and their associated costs.
What's Your PCB Application?
If the Pbfree PCBs you are purchasing are to be used in
medical, industrial, military/aerospace, consumer, computer,
or network systems, the Pbfree PCB requirements for each
of these system applications are vastly different from one
another with different costs and delivery times. So, it's
a good idea ato get a sound understanding of the Pbfree
PCB design, fabrication, and design steps associated with
your particular PCB application.
Higher Temperature Requirements for Lead Free Process
The higher temperatures used for Pbfree processing and rework
place greater stress on components and boards, which is
further aggravated by cumulative heat exposures. The combined
reflow and rework heat cycles can result in a single assembly
being exposed to as many as five thermal heat excursions
that includes two reflow passes, a wave solder pass and
two localized heating passes for rework.
The internal package structure within components and PCBs
must survive all processes and still provide longterm reliability.
Component effects include increased moisture sensitivity
levels (MSL), thus resulting shorter exposed floor life,
while PCB laminates must minimize internal layer delamination,
via cracking and board warpage.
SMT first pass reflow processing typically has the following
characteristics:
Four to six minute cycle times.
Temperature ranging from 230 to 250oC for joints and body
temperatures.
