2013
‐
09
‐
27
NUR
‐
05WL2
Implementation
Guide
v1.1
MSL
level
and
open
time
MSL
level
5
Open
time
(floor
life
out
of
the
bag)
48h
10.2
SOLDERING
PROCESS
Boundary
conditions
Acceptable
soldering
methods
Convection
reflow
in
air
or
nitrogen
atmosphere
Condensation
reflow
soldering
(vapor
phase)
Recommended
stencil
thickness
125um
±10um
Pad
design
on
motherboard
See
recommended
pad
pattern
Stencil
openings
See
recommended
stencil
pattern
Recommended
solder
alloy
SnAg3.8±0.2Cu0.7±0.2
Note!
If
using
under
‐
eutectic
solder
alloys,
such
as
SAC305,
it
may
be
necessary
to
increase
reflow
peak
temperature
by
5
‐
10°C,
due
to
higher
mp.
and
lower
fluidity
of
non
‐
eutectic
SnAgCu
alloys.
This
will
increase
thermal
stress
to
module
and
motherboard
greatly.
Convection
reflow
oven
heater
configuration
Double
sided
heating
required
in
reflow,
recommended
in
preheating
zones.
Maximum
absorbed
moisture
content
prior
to
thermal
processing
0.1%
‐
w
(Test
method
IPC
‐
TM
‐
650,
2.6.28)
Moisture
content
and/or
moisture
absorption
rate,
Printed
Board
Recommended
moisture
reduction
condition
+60°C/12h
vacuum
pack
removed
during
drying,
re
‐
seal
after
drying,
unless
modules
will
be
used
within
allowed
open
time
after
drying
Moisture
and
solvent
contamination
No
moisture
or
solvent
contamination
allowed
in
solder
paste
or
on
solderable
surfaces
Recommended
reflow
conditions
Preheating
phase
‐
max.
duration
180s
‐
end
temperature
190
‐
200°C
Summary of Contents for NUR-05WL2
Page 1: ...2013 09 27 NUR 05WL2 Implementation Guide v1 1 NUR 05WL2 IMPLEMENTATION GUIDE ...
Page 25: ...2013 09 27 NUR 05WL2 Implementation Guide v1 1 9 DIMENSIONS 9 1 MECHANICAL DIMENSIONS ...
Page 26: ...2013 09 27 NUR 05WL2 Implementation Guide v1 1 ...
Page 27: ...2013 09 27 NUR 05WL2 Implementation Guide v1 1 9 2 LAND PATTERN ...
Page 28: ...2013 09 27 NUR 05WL2 Implementation Guide v1 1 9 3 PASTE STENCIL ...
Page 29: ...2013 09 27 NUR 05WL2 Implementation Guide v1 1 9 4 PACKING TRAY DIMENSIONS ...
Page 30: ...2013 09 27 NUR 05WL2 Implementation Guide v1 1 All measures are in mm ...