Littelfuse SMOV34S Varistor Series - Manual (Page 4)

© 2013 Littelfuse, Inc. 246
Revised: May 8, 2013
Varistor Products
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/smov34s.html for current information.
SMOV34S Varistor Series
Thermally Protected Varistors > SMOV34S Series
Lead Material Tin–plated Copper
Soldering
Characteristics Solderability per MIL–STD–202,
Method 208E
Insulating Material
Cured, flame retardant epoxy polymer
meets UL94V–0 requirements.
Device Labeling
Marked with LF, part identifier, and
date code
Physical Specifications
Operating/Storage
Temperature -45°C to +75°C/
-45°C to +85°C
Humidity Aging
+75°C, 85% RH, 1000 hours
+/-10% voltage
Thermal Shock
+75°C to -40°C 5 times
+/-10% voltage
Solvent Resistance MIL–STD–202, Method 215F
Moisture Sensitivity Level 1, J–STD–020C
Environmental Specifications
Wave Solder Profile
Because the SMOV34S Series varistors contain a thermal protec-
tion device, care must be taken when soldering the devices into
place. Two soldering methods are possible. Firstly, hand soldering:
0
50
100
150
200
250
300
0 0.5 1 1.5 2 2.5 3 3.5 4
TIME(MINUTES)
T
E
M
P
E
RAT
URE
(
ºC)
Maximum Wave 240C
Lead–free Profile
0
50
100
150
200
250
300
0 0.5 1 1.5 2 2.5 3 3.5 4
TIME(MINUTES)
T
EMPER
A
T
U
R
E
(º
C
)
Maximum Wave 260C
Non Lead–free Profile
It is recommended to heat–sink the leads of the device. Secondly,
wave–soldering: It is critically important that all preheat stage and
the solder bath temperatures are rigidly controlled.
Figure 5 Figure 6
Part Numbering System
SMOV 34 S 321 N P
DEVICE FAMILY
Littelfuse Thermally Self Protected MOV
DISC SIZE (mm)
34mm
CERAMIC SHAPE
S: Square
115V to 750V
V M(AC)RMS
M:With Isolated Monitored Switch
N: Non Isolated Monitored Switch Design
P: Lead-Free and RoHS compliant
LF9
SMOV34S321MP
1148
UL Recognized
Component Mark
Production Site Code
Littelfuse Mark
Part Number
Production Date Dode
(Year and Week)
Part Marking System