2013
‐
09
‐
27
NUR
‐
05WL2
Implementation
Guide
v1.1
10
SMT
ASSEMBLY
PROCESS
AND
THERMAL
PROCESSING
NUR
‐
05WL2
module
contains
single
sided
assembly
of
SMT
components
reflow
‐
soldered
on
multilayer
HDI
(high
density
interconnections)
glass
‐
fiber
re
‐
enforced
epoxy
printed
board.
The
bottom
side
terminations
are
ENIG
(NiP/Au)
plated.
Soldering
alloy
used
for
attaching
module
components
is
eutectic
SnAgCu.
Module
internal
components
soldering
has
been
optimized
for
minimal
thermal
stress.
NUR
‐
05WL2
modules
shall
be
delivered
in
a
special
tray
packing
to
protect
modules
against
mechanical,
ESD
and
moisture
related
stresses.
Due
to
high
density
interconnections
technology,
module
total
water
content
have
to
be
below
0.1%
‐
w
prior
to
any
thermal
processing
above
water
boiling
point.
The
board
assembly
process
of
NUR
module
on
motherboard
will
introduce
re
‐
flow
of
module
components.
Thus,
to
avoid
degradation
of
solder
joint
interfaces,
the
module
has
to
be
stored
and
soldered
according
to
the
guidelines
given
below.
10.1
STORAGE
CONDITIONS
Long
‐
term
storage
Store
modules
in
unopened
vacuum
packs
in
a
dry
cabinet
under
following
environmental
conditions
Temperature
+15…+27°C
(optimal)
Temperature
gradient
max.
2°C/hour
Relative
humidity
<15%
within
specified
temperature
range
Opened
and
broken
packages
have
to
be
re
‐
sealed.
If
open
time
(floor
life
out
of
pack)
has
been
exceeded,
or
moisture
content
detected,
modules
have
to
be
baked
prior
to
re
‐
sealing
vacuum
pack.
Short
‐
term
storage
(typically
same
as
production
environment)
Temperature
+20…+27°C
Temperature
gradient
max.
2°C/hour
Relative
humidity
<15%
within
specified
temperature
range
Modules
may
be
stored
in
a
dry
cabinet
without
protective
packing
according
to
IPC/JEDEC
J
‐
STD
‐
033B.1,
table
7
‐
1.
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 ...