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SMD Soldering How To Solder SMT Components and Chips Using Solder Paste With Your PCB's |
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SMD
& PCB SOLDERING AS IT SHOULD BE
For Production-Quality Solder Joints Complete with Fillets at the Bench! |
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Here’s How Simple High-Quality SMD Soldering Can Be... |
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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.
First, switch on 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 creating 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. (Recommended:
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:
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: 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
UnLeaded & Leaded Alloys!
Click Photo |
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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, 2013, 2014-2016, 2017-2018 Ameritronics®. All rights reserved. The
information you receive online from Ameritronics® is protected by
the copyright laws of the United States. The copyright laws prohibit
any copying, redistributing, retransmitting, or repurposing of any
copyright-protected material. Ameritronics® is the registered
trademark property of JTI, Inc. "Zephyrtronics" and "Zephlux"
and "ZeroLead" and "Zero Balling" and "Zero Residue" and "Post
Cooling" and "PostCooler" and "AirBath" and "Quatro" and "Full Metal
Jacket" are the protected trademark property of JTI, Inc.
Revised for
July 3,
2018 |
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PCB,
SMD, BGA Rework & Prototyping
AirBath,
SMD Rework
Stations,
Hot Air
Pencil Soldering,
BGA Rework
Stations,
CSP Rework
Stations,
Preheating
Systems,
PCB
Preheaters,
Pre-Heat
SMT / SMD,
Low Temp Rework,
SMT
DeSoldering Tools,
Vacuum
Pickup Tools,
Circuit
Board Holders,
PCB
Fixtures,
Board
Cradles,
Rework
Solder Paste,
No-Clean
Solder Paste,
Low Melt®
De-Solder Wire,
DeSolder
Wire,
Hot Air
Rework Stations,
Fume
Extractors,
SMT Dental
Probes,
SMT-SMD
Rework Kit,
BGA Rework
Kit,
LMK Kit,
BGA
Re-Balling Kit,
SMD
Tweezers,
Power Palm
Plunger
How To Work With SMD's, CSP's, BGA's &
QFN's
How To -
BGA Alignment:
How To -
SMT Rework:
How To - PCB Preheating,
How To -
BGA & CSP Rework:
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:
How To -
Hot Air Pencil / AirPencil Soldering;
How To -
SMD Quick Chip Removal;
How To -
BGA Re-Balling;
How To -
Rework PLCC - QFP, QFN, LCC, SOIC, Sub Shielded SMD, TSOP:
How To -
Solder & Rework Ceramic Capacitors:
How To -
Solder & Rework Glass Diodes
PCB
Soldering,
De-Soldering
Soldering
Accessories,
Solder
Wire,
No-Clean
Solder Wire,
Soldering Wire
Dispenser,
Solder
Paste,
Lead-Free
Solder Paste,
Flux,
Solder
Paste Dispensers,
LowMelt®
DeSolder Wire,
De-Solder
Wire,
Soldering
Irons,
Digital
De-Soldering,
Soldering
Tips,
Thru-Hole
DeSoldering Tools,
Desoldering
Tip,
Tips for
Desoldering,
De-Solder
Wick,
Smoke
Extractors,
Fume
Extractor Filters,
Carbon
Activated Filters,
SolderMill™,
Pre-Heating Systems,
Preheat
Thru-Hole,
PCB
Pre-Heating,
Flux
Solvent,
How To - Connector Rework;
How To -
PC/104 Soldering and Rework;
How To -
Thru-Hole / Through Hole Desolder / De-Solder;
How To -
Low Melt® Desolder Wire;
How To-
Stop Lifting Pads;
How To-
Desolder / De-Solder Heavy Ground Planes;
How To -
Lead-Free Soldering and De-Soldering;
Preheaters
for Lead-Free Rework and Soldering
Dispensing, Solder Paste, Liquids & Fluids
Dispensing
Systems,
Dispensing
Syringes,
Dispensing
Barrels,
Tapered
Tips,
Blunt
Needles,
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Steel Needles,
Dispensing
Needles,
Industrial
Needles,
Dispensing
Tips,
Dispensing
Accessories,
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Paste in Syringe,
Lead-Free
Solder Paste in Syringe,
Paste Rack™
Solder Paste Holder,
Dispensing
Supplies,
Power Palm
Plunger,
Manual
Dispensing,
Automatic
Dispensing
Laboratory &
Bench Supplies & Tools
SMD Solder
Paste,
Lead-Free
Solder Paste,
Solder
Wire,
LowMelt®,
No-Clean
Flux,
BGA Flux,
Rework Tack
Flux,
Non-Flammable Flux Remover,
Inspection
Equipment,
Magnification Equipment,
Magnifying
Work Light,
ESD
Magnifier,
Pen Vac,
SMT
Tweezers,
Fume
Extraction,
SMD
Tweezers,
PC Board
Fixtures,
Hot Air
Tips,
AirTips,
Replacement
Soldering Sponges,
Iron Plated
Soldering Tips,
Art
Conservation Hot Air Tools,
Foam Swabs,
Anti-Static
Foam Swabs,
Thru-Hole
Brushes,
LMK Rework
Kits |
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