V18MLE0402NR Datasheet, PDF (4/6 Pages) Littelfuse – Varistor Products Surface Mount Multilayer Varistors (MLVs) > MLE Series

Varistor Products
Surface Mount Multilayer Varistors (MLVs) > MLE Series
Lead (Pb) Soldering Recommendations
The principal techniques used for the soldering of
DPNQPOFOUT
JO
TVSGBDF
NPVOU
UFDIOPMPHZ
BSF
*3
3FnPX

and Wave soldering. Typical profiles are shown on the right.
Reflow Solder Profile
The recommended solder for the MLE suppressor is
B

4O1C"H

4O1C
PS

4O1C 

230
-JUUFMGVTF
BMTP
SFDPNNFOET
BO
3."
TPMEFS
nVY
Wave soldering is the most strenuous of the processes.
To avoid the possibility of generating stresses due to
thermal shock, a preheat stage in the soldering process
is recommended, and the peak temperature of the solder
process should be rigidly controlled.
When using a reflow process, care should be taken to
ensure that the MLE chip is not subjected to a thermal
gradient steeper than 4 degrees per second; the ideal
gradient being 2 degrees per second. During the soldering
process, preheating to within 100 degrees of the solder's
QFBL
UFNQFSBUVSF
JT
FTTFOUJBM
UP
NJOJNJ[F
UIFSNBM
TIPDL
Figure 9
Wave Solder Profile
0ODF
UIF
TPMEFSJOH
QSPDFTT
IBT
CFFO
DPNQMFUFE
JU
JT

still necessary to ensure that any further thermal shocks
BSF
BWPJEFE
0OF
QPTTJCMF
DBVTF
PG
UIFSNBM
TIPDL
JT
IPU

printed circuit boards being removed from the solder
process and subjected to cleaning solvents at room
temperature. The boards must be allowed to cool gradually
UP
MFTT
UIBO
$
CFGPSF
DMFBOJOH
Figure 10
Lead–free (Pb-free) Soldering Recommendations
Littelfuse offers the Nickel Barrier Termination finish for the
optimum Lead–free solder performance.
5IF
QSFGFSSFE
TPMEFS
JT

4O"H$V
XJUI
BO
3."

flux, but there is a wide selection of pastes and fluxes
available with which the Nickel Barrier parts should be
compatible.
The reflow profile must be constrained by the maximums
JO
UIF
-FBEoGSFF
3FnPX
1SPmMF
'PS
-FBEoGSFF
8BWF

TPMEFSJOH
UIF
8BWF
4PMEFS
1SPmMF
TUJMM
BQQMJFT
/PUF
UIF
-FBEoGSFF
QBTUF
nVY
BOE
QSPmMF
XFSF
VTFE
GPS

evaluation purposes by Littelfuse, based upon industry
standards and practices. There are multiple choices of all
three available, it is advised that the customer explores the
optimum combination for their process as processes vary
considerably from site to site.
Lead–free Re-flow Profile
MAXIMUM TEMPERATURE 260˚C
20 - 40 SECONDS WITHIN 5˚C
RAMP RATE
<3˚C/s
60 - 150 SEC
> 217˚C
PREHEAT ZONE
Figure 11
5.0
6.0 7.0
MLE Varistor Series
Revision: November 29, 2011
©2011 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/MLE.html for current information.