|
V18MLE1206H Datasheet, PDF (4/6 Pages) Littelfuse – 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
DPNQPOFOUTJOTVSGBDFNPVOUUFDIOPMPHZBSF*33FnPX
and Wave soldering. Typical proï¬les are shown on the right.
Reï¬ow Solder Proï¬le
The recommended solder for the MLE suppressor is
B 4O1C"H
4O1C
PS 4O1C
230
-JUUFMGVTFBMTPSFDPNNFOETBO3."TPMEFSnVY
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 reï¬ow 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
QFBLUFNQFSBUVSFJTFTTFOUJBMUPNJOJNJ[FUIFSNBMTIPDL
Figure 9
Wave Solder Proï¬le
0ODFUIFTPMEFSJOHQSPDFTTIBTCFFODPNQMFUFE
JUJT
still necessary to ensure that any further thermal shocks
BSFBWPJEFE0OFQPTTJCMFDBVTFPGUIFSNBMTIPDLJTIPU
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
UPMFTTUIBOÂ$CFGPSFDMFBOJOH
Figure 10
Leadâfree (Pb-free) Soldering Recommendations
Littelfuse offers the Nickel Barrier Termination ï¬nish for the
optimum Leadâfree solder performance.
5IFQSFGFSSFETPMEFSJT 4O"H$V
XJUIBO3."
ï¬ux, but there is a wide selection of pastes and ï¬uxes
available with which the Nickel Barrier parts should be
compatible.
The reï¬ow proï¬le must be constrained by the maximums
JOUIF-FBEoGSFF3FnPX1SPmMF'PS-FBEoGSFF8BWF
TPMEFSJOH
UIF8BWF4PMEFS1SPmMFTUJMMBQQMJFT
/PUFUIF-FBEoGSFFQBTUF
nVYBOEQSPmMFXFSFVTFEGPS
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.
Leadâfree Re-ï¬ow Proï¬le
MAXIMUM TEMPERATURE 260ËC
20 - 40 SECONDS WITHIN 5ËC
RAMP RATE
<3ËC/s
60 - 150 SEC
> 217ËC
PREHEAT ZONE
Figure 11
5.0
6.0 7.0
MLE Varistor Series
34
Revision: July 16, 2009
©2009 Littelfuse, Inc.
Speciï¬cations are subject to change without notice.
Please refer to www.littelfuse.com/series/MLE.html for current information.
|
▷ |