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How To Solder SMT Components & Chips How to Use Solder Paste With Your PCB's SMD Soldering
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SMD SOLDERING AS IT SHOULD BE!
We Pioneered Using Solder Paste First at the Benchtop Instead of Solder Wire. Nearly 30 Year Ago!
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Here’s Just How Simple High-Quality SMD Soldering Can Be With Shiny Solder Joints & Fillets!
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Apply Bead of Solder Paste.
With the appropriate gage of
paste application tip (See
Selection Chart Below),
apply a continuous bead of
solder paste down the middle
of the pads (Recommended:
Zephpaste SPE-0012) as
shown here. |
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Pick and Place Chip. Using an
ESD safe, and soft vacuum lifting device
such as the
ZT-3-MIL AIRPICK, lift and gently
place the selected SMD on top of the
bead of paste above the corresponding
pads. |
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Adjust Alignment if Needed. After
placing SMD, check so all leads and pads are
aligned. "Fine tune" with a stainless steel
SMD or Dental Probe as shown. Recommended (SMT
Probes SDP-1111). |
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Always Preheat. Switch the
ZT-1 AIRBATH to "Warm" at
industry
recommended setting of 150°C. How long?
The process itself will tell you. When
bead of solder paste runs (30-60 sec),
flux has activated and the PCB is
preheated. |
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Using a Low Velocity Hot Air
Pencil with precision,
pin-pointed AirPencil, apply
heated airstream to shoulders of
the SMD's leads (not the pads).
Allow time so that all solder
wicks up making shiny joints
with fillets one joint at a
time. Inspect.
Recommended:
ZT-2-MIL AirPencil.) |
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Cool Down & Final Cleaning.
Flip rocker switch of
ZT-1 AirBath
to "Cool" mode to cool down PCB. Dip a large anti-static foam
swab into non-flammable flux solvent or remover.
We recommend
Non-Flammable Flux Remover |
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Swab PCB with Flux Remover.
As PCB cools under
ZT-1 AirBath, swab area
where SMD was placed and
reflowed to the pads with Flux
Remover as shown. Turn off
AirBath. Inspect. (For graphic
contrast, a white foam swab is
shown at left.). |
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Inferior Soldering Iron with Solder Wire
Vs
Superior Hot
Air Soldering & Solder Paste
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Above: An inferior "tack" solder joint made with the traditional,
contact soldering iron and solder wire. At best, only a tangential joint is achieved at the lead/pad interface. Such inferior joints are no more acceptable from the bench than they
are from a conveyor oven or wave solder machine. |
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Above: A superior solder joint for SMD's.
Here's how to make good solder joints: A bead of solder paste is applied to the pads, followed by placement of the SMD onto the pad and seated into the paste.
Next, a brief preheating of the bottom side of the PCB is made. After 30-60 seconds, flux activation begins (solder bead begins to visibly level).
A localized, pin-pointed reflow of solder paste is made at each individual lead/pad interface with a low velocity hot air pencil. Solder wets and wicks up to the lead's toes, heels and sides with production quality fillets.
It's elementary:
What is a good solder joint? A solder joint made at the bench with the same materials and processes used in premium production conveyor ovens will be the same.
This only requires the following:
a) solder paste (not wire)
b) convective preheating prior to
reflow
c) convective reflow (hot air pencil)
not messy contact (soldering iron)
For a more in depth look at SMD soldering, please refer to
"Making High Quality Solder Joints at the Bench". |
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Zephyrtronics
Popular
No Clean
Solder Paste
6 Month Shelf
No Refrigeration
Available in
Un-Leaded & Leaded Alloys!
Click Photo |
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A Few Extra Notes:
The above example is made with a "gull winged " SOIC
20. This same method works equally well with the "J"
leaded PLCC's. For finer pitched components, such as
the popular QFP 100 and the QFP 208, a slight
variation in technique is easily made with equally,
if not even more effective results (call
Zephyrtronics for details...we can't teach our
competitors all of our tricks).
For SMD
Component Removal, please be sure to see LowMelt®
Process of Co-Metalization and Rapid SMD Removal in
Less Than 180 Seconds and learn more about the
history and benefits of the popular Zephyrtronics
LowMelt DeSolder®.
Please note: Zephyrtronics has conveniently packaged
all of the above described chemicals, ZephPaste
Solder Paste, Anti-Static Swabs, SMT/Dental Probes,
LowMelt®
DeSolder and more in the
LMK-1000 SMD Benchtop Kit our Blueprint for the
Bench™, or best of all, please visit our
Systems Section in this Website where our more
popular, comprehensive benchtop systems are
graphically presented. |
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©1996 - 2011, 2012,
"SolderGlide" and "SolderMill"
and "ZeroTouch" and "Just So Superior" are the protected trademark
property of JTI, Inc. "Zephyrtronics" and "Low Melt" and "Air
Fountain" and "Fountainhead" are the registered trademark
properties of JTI Inc. *The above names are the registered
property of their respective owners. |
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SMD
Rework,
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AirBath Air Bath,
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How To - BGA Alignment;
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How To - Quickly Solder
SMD Packages Effectively;
How To - CSP Alignment;
How To - Lead-Free Rework;
How To - SMD Removal
Economical;
How To - SMD Removal
Professional;
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How To - Connector Rework;
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How To - Low Melt®
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How To- Stop Lifting Pads;
How To- Desolder /
De-Solder Heavy Ground Planes;
How To - Lead-Free
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Pre-Heaters for Lead-Free Rework and Soldering
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Cutters,
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Straightening Tool for
QFP Leads,
ESD Wrist Straps,
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Updated
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