Thermally Protected Varistors > SMOV
®
34S Varistor Series
Metal-Oxide Varistors
(MOVs)
SMOV
®
34S Varistor Series
Description
RoHS
The Littelfuse SMOV
®
34S thermally protected varistor is a
self-protected device. It consists of a 34mm square varistor
with an integral thermal disconnect designed to open in the
event of overheating due to abnormal overvoltage as outlined
in UL1449. The SMOV
®
helps facilitate SPD module compliance
to UL1449 and offers quick thermal response due to the close
proximity of the integrated thermal element to the MOV body.
This configuration also offers lower inductance than most discreet
solutions resulting in improved clamping performance to fast over
voltage transients.
The device has a separate micro-switch, which can be used to
indicate that the MOV has been disconnected from the circuit. This
separate switch makes the monitoring circuitry completely isolated
from the main power which ensures indicator circuit safety and
simplifies the customers circuit design.
Agency File Number
Agency Approvals
Agency
Agency Approval
Features
• Maximum single
surge capability 40 kA,
8/20 waveshape.
• Nominal Discharge
Current Value: 20kA.
• Intermediate current
rating: 50A/150A.
• -45°C to +75°C operating
temperature.
• Recognized to UL 1449.
• Lead-Free and RoHS
compliant.
• Integrated micro-switch
for indication
circuitry/design.
UL1449
E320116
Additional Information
Datasheet
Resources
Samples
Applications
•
•
•
•
•
SPD applications
AC/DC distribution
T/Data center
Power supplier
Telecommunication
Absolute Maximum Ratings
• For ratings of individual members of a series, see Device Ratings and Specifications chart
SMOV34S S Varistor Series
Continous:
Steady State Applied Voltage:
DC Voltage Range (VM(DC))
AC Voltage Range (V
M(AC)RMS
)
Transient:
Non-Repetitive Surge Current, 8/20µs Waveform (I
TM
)
Non-Repetitive Energy Capability, 2ms Waveform (W
TM
)
Operating Ambient Temperature Range (T
A
)
Storage Temperature Range (T
STG
)
Hi-Pot Encapsulation (Isolation Voltage Capability)
Isolation Voltage Capability (when the thermal disconnect opens)
Housing Insulation Resistance
Units
150 to 970
115 to 750
40,000
280 to 1200
-45 to +75
-45 to +85
2500
1500
>1,000
V
V
A
J
°C
°C
V
V
MΩ
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or
any other conditions above those indicated in the operational sections of this specification is not implied.
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/14/17
Metal-Oxide Varistors
(MOVs)
Thermally Protected Varistors > SMOV
®
34S Varistor Series
Device Ratings & Specifications
Maximum Rating (75°C)
Continuous
Part
Number
AC
Volts
V
M (AC)
(V)
SMOV34S111MP
SMOV34S111NP
SMOV34S131MP
SMOV34S131NP
SMOV34S151MP
SMOV34S151NP
SMOV34S181MP
SMOV34S181NP
SMOV34S251MP
SMOV34S251NP
SMOV34S271MP
SMOV34S271NP
SMOV34S301MP
SMOV34S301NP
SMOV34S321MP
SMOV34S321NP
SMOV34S421MP
SMOV34S421NP
SMOV34S461MP
SMOV34S461NP
SMOV34S511MP
SMOV34S511NP
SMOV34S551MP
SMOV34S551NP
SMOV34S621MP
SMOV34S621NP
SMOV34S751MP
SMOV34S751NP
115
130
150
180
250
275
300
320
420
460
510
550
620
750
RMS
Specifications (25 °C)
Varistor
Voltage at
1mA Test
Current
V
N(DC)
Min
(V)
162
184.5
216
256
351
387
432
459
612
643.5
738
770
900
1080
198
225.5
264
312
429
473
528
561
748
786.5
902
939
1100
1320
V
N(DC)
Max
Maximum
Clamping
Voltage
8/20μs
Vc
(V)
305
345
405
488
650
730
780
830
1130
1188
1350
1415
1625
2000
I
PK
(A)
200
200
200
200
200
200
200
200
200
200
200
200
200
200
Typical
Capacitance
f = 1MHz
Transient
DC
Volts
V
M(DC)
(V)
150
175
200
240
320
350
385
420
560
610
675
700
800
970
Energy
2ms
W
TM
(J)
280
310
360
400
490
550
590
640
910
960
960
965
1010
1200
Peak
Surge
Current
8/20μs
I
TM
1 × Pulse
(A)
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
Nominal
Discharge
Current
In
(A)
20000
20000
20000
20000
20000
20000
20000
20000
20000
10000
10000
10000
10000
10000
C
(pF)
11500
10000
8000
6800
5000
4500
4050
3800
3000
2800
2500
2250
2100
1800
Average power dissipation of transients should not exceed 2.0 watts
Same ratings and specifications apply to Non Isolated Monitored Switch alternative design. Replace "M" with "N" in the part number. e.g.: SMOV34S111NP
.
Refer to Part Number System at the end of this document.
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/14/17
Thermally Protected Varistors > SMOV
®
34S Varistor Series
Metal-Oxide Varistors
(MOVs)
Thermal Characteristics
10
Peak Current & Energy Derating Curve
100
PERCENT OF RATED VALUE
80
Typical
Current (A)
10 A
1
5A
2.5 A
0.5 A
60
40
20
0 .1
0
- 45
50
60
70
80
90
100
110
120
130
Figure 1
1
10
10 0
Figure 2
AMBIENT TEMPERATURE (ºC)
Time (secs)
For applications exceeding 75ºC ambient temperature, the peak
surge current and energy ratings must be reduced as shown.
Pulse Rating Curve
50,000
20,000
10,000
5,000
2
15
10
2
10
3
10
4
10
5
1
SURGE CURRENT (A)
2,000
1,000
500
200
100
50
20
10
10
6
INDEFINITE
20
100
1,000
IMPULSE DURATION ( µs)
10,000
Figure 3
Transient V-I Characteristic Curve
10000
Maximum Clamping Voltage
TA = -45 C to 75C
Voltage -
VOLTS
V511
V551
V571
V751
V661
V681
1000
V481
V141 V131
V441
V421
V151
100
1mA
10mA
100mA
1A
10A
100A
1000A
10000A
V111
Figure 4
100000A
Current - AMPS
V391
V351 V331 V321 V301 V271
V251 V201 V181
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/14/17
Metal-Oxide Varistors
(MOVs)
Thermally Protected Varistors > SMOV
®
34S Varistor Series
Wave Solder Profile
Because the SMOV
®
34S varistors contain a thermal protection
device, care must be taken when soldering the devices into place.
Two soldering methods are possible. Firstly, hand soldering: 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.
Non Lead–free Profile
300
250
TEMPERATURE (ºC)
200
150
100
50
0
0
0.5
1
1.5
2
2.5
3
3.5
4
TIME(MINUTES)
Lead–free Profile
300
Maximum Wave 240C
TEMPERATURE (ºC)
Maximum Wave 260C
250
200
150
100
50
0
0
0.5
1
1.5
2
2.5
3
3.5
4
TIME(MINUTES)
Figure 5
Figure 6
Physical Specifications
Lead Material
Soldering
Characteristics
Insulating Material
Device Labeling
Tin–plated Copper
Solderability per MIL–STD–202,
Method 208
Cured, flame retardant epoxy polymer
meets UL94V–0 requirements.
Marked with LF part identifier, and
,
date code
Environmental Specifications
Operating/Storage
Temperature
Humidity Aging
Thermal Shock
Solvent Resistance
Moisture Sensitivity
-45°C to +75°C/
-45°C to +85°C
+75°C, 85% RH, 1000 hours
+/-10% voltage
+75°C to -40°C 5 times
+/-10% voltage
MIL–STD–202, Method 215
Level 1, J-STD-020
Part Numbering System
Part Marking System
UL Recognized
Component Mark
Production Site Code
Littelfuse Mark
Part Number
Production Date Dode
(Year and Week)
SMOV 34 S 321 N P Xxxxx
DEVICE FAMILY
Littelfuse Thermally Self Protected MOV
DISC SIZE (mm)
34mm
CERAMIC SHAPE
S: Square
V
M(AC)RMS
115V to 750V
SMOV34S321MP
1148
LF9
M:With Isolated Monitored Switch
N: Non Isolated Monitored Switch Design
P: Lead-Free and RoHS compliant
Option Codes
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/14/17
Thermally Protected Varistors > SMOV
®
34S Varistor Series
Metal-Oxide Varistors
(MOVs)
Device Dimension
41Max
20Max
Lead Configuration
44.5Max
LF 9
SMOV34S321MP
1148
P1
LF9
SMOVXXS321MP
P1
Galvanic isolation
LF9
SMOVXXS321MP
1.4±0.2
3*0.6±0.2
Galvanic isolation
1209
Thermal
disconnect
S1 ON
(Normal Close)
S3 Common
10Min
10Min
1.2±0.3
0.3±0.2
1209
0.5±0.2
Thermal
disconnect
3.6±0.3
P2
6.0±0.2
S1 ON
(Normal Close)
S2 S3 S1
S3 Common
MOV
P1
S2 OFF
(Normal open)
6.0±0.2
11.0±0.5
21.5±0.2
S2 S3 S1
P2
S2 S3 S1
P2
MOV
P1
P1
P2
S2 S3 S1
P2
S2 OFF
(Normal open)
P1
Primary side
P2
Secondary side
Primary side
Secondary side
2.5±0.3
6.5±2.2
Galvanic isolation
P1
* LED is off when the product is normal(S1,S3 connected),
LED is on when the product disconect opens(switch change
status; S2,S3 connected as shown by dotted line ).
Application Example
Thermal
disconnect
S1 ON
Galvanic isolation
P1
R
LED
Thermal
disconnect
S1 ON
R
LED
S2 OFF
Note: EXAMPLE ONLY - Connection to S2-S3 and S1-S3
depends on customer indication circuit and can vary.
S3 Common
Primary side
P2
Secondary side
MOV
S2 OFF
Note: EXAMPLE ONLY - Connection to S2-S3 and S1-S3
depends on customer indication circuit and can vary.
Primary side
P2
Secondary side
Switch Specification
SMOV Switch
Switch
Voltage DC
12V
Current (Amps)
0.1A
Contact Resistance Max. Insulation Resistance Min.
70mΩ
100MΩ
Dialectric Strength
0.5mA/Minute
500VAC
Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and
test each product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications.
Read complete Disclaimer Notice at
www.littelfuse.com/disclaimer-electronics.
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/14/17
To Protected Circuit
* LED is off when the product is normal(S1,S3 connected),
LED is on when the product disconect opens(switch change
status; S2,S3 connected as shown by dotted line ).
MOV
S3 Common
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