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We have put together a synopsis for you on
some of the most common experiences we have
come across in dealing with the rework of
lead free BGAs in the last 6-9 months. We
hope that this information is useful as it
provides a synopsis of the most common
experiences users are facing with respect to
lead free rework. If you have specific
issues with lead free BGA rework please call
us for guidance or use our "Ask the
Expert" column on our web site. There
are also more PCB repair kits being rolled
out for your review. If you are looking for
a special gift for that special hardware
"geek" see the article below for some ideas.
Merry Christmas and Healthy Happy New Year!
Bob Wettermann, CIT
President
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Lead Free BGA Rework |
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There are several issues related to
making sure that the lead free
rework process issues are dealt with
properly. These are detailed on
several new pages on the
web site. The topics that are
covered include:
- The Issues Related to the
Lead Free Transition
- Mixed Alloy Pitfalls
- Lead Free BGA Rework Process
Issues
- Lead Free BGA Inspection
The articles discusses how you can
practically determine which
assemblies are lead free and which
are tin lead. Visual
differentiation, analytical testing
and board and part marking methods
are discussed in detail on these
pages.
There are several issues which need
to be considered while reworking
BGAs in a mixed alloy environment.
The materials used in the rework
process need to be controlled and
segregated to help insure that the
right materials are used in the
rework process. There are several
ways that are described in the
article in detail about how to
effectively control the potential
for cross-contaminating lead-bearing
and lead free soldering materials.
Also an understanding of the
potential consequences of mixed
alloy assemblies is discussed.
A “recalibration” of the inspection
processes and equipment needs to be
included in your transition
checklist for BGA tin-lead to lead
free rework. This "recalibration"
needs to include visual, XRAY and
endoscopic inspection.
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Advanced SMT Soldering Class SPECIAL |
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The BEST Advanced SMT class, which
includes fine pitch components,
small footprint chip scale
components and basics BGA rework,
will be held at BEST in Rolling
Meadows IL on January 15th and 16th.
As our first 2007 training course
"special" participants registering
for this class will receive 10%
off.
The BEST Advanced SMT Hand Soldering
/ Rework Certification course is an
advanced level course that provides
instruction on effective techniques
for the conductive and convective
removal and replacement for advanced
SMT packages. These include 0402,
0201 chip style parts, 20mil pitch
gull wing devices, PLCC sockets,
full and perimeter array BGAs, and
micro BGAs. During the course, the
student will be introduced to
advanced SMT packaging, solder paste
requirements and application
techniques, BGA profiling and reflow
process development and x-ray
inspection interpretations for BGAs.
This course is structured to be in
accordance with IPC-A-610,
J-STD-001, IPC-7711, IPC-7721 and
IPC 7095 BGA Spec.
Call Katy Radcliff at
(847) 797-9250 for more
details or to register.
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New PCB Epoxy Repair Kit |
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The BEST Epoxy Repair Kit can
be used to repair lifted pads and
traces as well as build up and
repair edge corner damage to PCB's.
BEST epoxy repair kits are
designed by artisans who have
been repairing circuit boards
for many years; therefore the
right tools have been included
in this general epoxy repair
kit. The resin/hardner is
pre-measured to ensure every
mixture made will achieve
optimum adhesion results.
BEST
testing has shown by using
the BEST 2-part electronics
adhesive system, the bond
strength of repair traces, pads,
and lands equals that of the
original land, pads, and traces.
Even under thermal air shock
conditions from –50C to 85C at
30 minutes dwell time for 200
cycles this adhesive system
performed well. The same cannot
be said about dry film bonding
systems where the reliability of
repaired pads, lands and traces
did not hold up to such shocking
environmental conditions.
This kit includes the following
items:
- Resin/Hardener, 2 gms
- Orangewood sticks
- Dental pick
Please call Katy Radcliff at
extension x32 if you have
questions on this and other
other PCB repair tools.
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Top 10 Christmas Gifts for Hardware
Geeks 2006 |
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So you do not know what to get your
favorite geek on your Chirstmas
list? Well then visit the
following or
this to get some ideas.........
Happy Shopping!!!
There are many definitions of what a
"geek" is but here are some of my
favorites if you do not know :
1. One who is primarily motivated by
passion indicating somebody whose
reasoning and decision making is
always first and foremost based on
his personal passions rather than
things like financial reward or
social acceptance. Geeks do not see
the typical "geeky" interests as
interesting, but as passionate
devotions. So this means that
someone can be a "PCB repair geek"
and having a deep interst in this
narrow topic. Some of them work at
BEST.
2. A person who is interested in
technology, especially computing and
new media.
3. A person who has chosen
concentration rather than
conformity; one who pursues skill
(especially technical skill) and
imagination, not mainstream social
acceptance. Geeks usually have a
strong case of neophilia (a love of
novelty and new things).
4. A person with a devotion to
something in a way that places him
or her outside the mainstream. This
could be due to the intensity,
depth, or subject of their interest.
This definition is very broad, and
allows for mathematics geeks,
aviation geeks, band geeks, computer
geeks, science geeks (including,
among others, physics, chemistry,
and biology geeks, as well as social
science include but not limited to
economics, psychology and
sociology), music geeks
(audiophile), movie and film geeks (cinephile),
etc.....
5. A performer at a carnival who
swallows various live animals and
bugs. See etymology above.
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More BEST information |
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