Download Varistors SMOV34S Datasheet

Varistor Products
Thermally Protected Varistors > SMOV34S Series
SMOV34S Varistor Series
RoHS
Description
The Littelfuse SMOV thermally protected varistor is a selfprotected 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
3rd edition. 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 Approvals
Agency
Agency File Number
E320116
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 3rd edition.
• Lead-Free and RoHS
compliant.
• Integrated micro-switch
for indication
circuitry/design.
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
Continous:
Steady State Applied Voltage:
DC Voltage Range (VM(DC))
AC Voltage Range (VM(AC)RMS)
Transient:
Non-Repetitive Surge Current, 8/20µs Waveform (ITM)
Non-Repetitive Energy Capability, 2ms Waveform (WTM)
SMOV34S Series
Units
150 to 970
115 to 750
V
V
40,000
A
280 to 1200
J
Operating Ambient Temperature Range (TA)
-45 to +75
°C
Storage Temperature Range (TSTG)
-45 to +85
°C
2500
V
Hi-Pot Encapsulation (Isolation Voltage Capability)
Isolation Voltage Capability (when the thermal disconnect opens)
Housing Insulation Resistance
1500
V
>1,000
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.
www.BDTIC.com/littelfuse
© 2014 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 05/23/14
Varistor Products
Thermally Protected Varistors > SMOV34S Series
SMOV34S Series Ratings & Specifications
Maximum Rating (75°C)
Continuous
Part
Number
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
Varistor
Voltage at
1mA Test
Current
DC
Volts
Energy
2ms
VM(DC)
WTM
(V)
(V)
(J)
115
150
280
40000
20000
162
130
175
310
40000
20000
150
200
360
40000
180
240
400
250
320
275
AC
Volts
Nominal
Discharge
Current
VN(DC)
Max
VN(DC)
Min
Maximum
Clamping
Voltage
8/20μs
Typical
Capacitance
f = 1MHz
Vc
IPK
C
(V)
(A)
(pF)
198
305
200
11500
184.5
225.5
345
200
10000
20000
216
264
405
200
8000
40000
20000
256
312
488
200
6800
490
40000
20000
351
429
650
200
5000
350
550
40000
20000
387
473
730
200
4500
300
385
590
40000
20000
432
528
780
200
4050
320
420
640
40000
20000
459
561
830
200
3800
420
560
910
40000
20000
612
748
1130
200
3000
460
610
960
40000
10000
643.5
786.5
1188
200
2800
510
675
960
40000
10000
738
902
1350
200
2500
550
700
965
40000
10000
770
939
1415
200
2250
620
800
1010
40000
10000
900
1100
1625
200
2100
750
970
1200
40000
10000
1080
1320
2000
200
1800
RMS
SMOV34S111NP
Transient
Peak
Surge
Current
8/20μs
ITM
1 × Pulse
(A)
VM (AC)
SMOV34S111MP
Specifications (25 °C)
In
(A)
(V)
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.
www.BDTIC.com/littelfuse
© 2014 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 05/23/14
Varistor Products
Thermally Protected Varistors > SMOV34S Series
Thermal Characteristics
Peak Current & Energy Derating Curve
10
PERCENT OF RATED VALUE
100
Current (A)
Typical
10 A
1
5A
2.5 A
0.5 A
60
40
20
0
- 45
0 .1
Figure 1
80
1
10
50
60
Figure 2
10 0
Time (secs)
70
80
90
100
110
120
130
AMBIENT TEMPERATURE (ºC)
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
SURGE CURRENT (A)
10,000
2
10 2
2,000
10 3
500
SMOV34
15
5,000
1,000
1
10 5
10 6
10 4
200
100
50
20
10
Figure 3
INDEFINITE
20
100
1,000
IMPULSE DURATION ( µs)
SMOV34S V–I Characteristic Curves for SMOV34S Varistor
10000
Maximum Clamping Voltage
SMOV34S series
TA = -45 C to 75C
V751
Voltage VOLTS
V661
V511
V551
V681
V571
1000
V481
V141 V131
V111
V441
V151
V421
Figure 4
100
1mA
10mA
100mA
Current - AMPS
1A
V391
10A
100A 1000A
V351 V331 V321 V301 V271
10000A
100000A
V251 V201 V181
www.BDTIC.com/littelfuse
© 2014 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 05/23/14
10,000
Varistor Products
Thermally Protected Varistors > SMOV34S Series
Wave Solder Profile
Because the SMOV34S Series 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.
Lead–free Profile
Non Lead–free Profile
300
300
250
TEMPERATURE (ºC)
250
TEMPERATURE (ºC)
Maximum Wave 260C
Maximum Wave 240C
200
150
100
200
150
100
50
50
0
0
0
0.5
1
1.5
2
2.5
3
3.5
TIME(MINUTES)
Figure 5
Physical Specifications
4
0
0.5
1
1.5
2
2.5
3
3.5
4
TIME(MINUTES)
Figure 6
Environmental Specifications
Operating/Storage
Temperature
-45°C to +75°C/
-45°C to +85°C
Humidity Aging
Cured, flame retardant epoxy polymer
meets UL94V–0 requirements.
+75°C, 85% RH, 1000 hours
+/-10% voltage
Thermal Shock
Marked with LF, part identifier, and
date code
+75°C to -40°C 5 times
+/-10% voltage
Solvent Resistance
MIL–STD–202, Method 215F
Moisture Sensitivity
Level 1, J–STD–020C
Lead Material
Tin–plated Copper
Soldering
Characteristics
Solderability per MIL–STD–202,
Method 208E
Insulating Material
Device Labeling
Part Numbering System
SMOV 34 S 321 N P Xxxxx
DEVICE FAMILY
Littelfuse Thermally Self Protected MOV
Part Marking System
UL Recognized
Component Mark
Production Site Code
Littelfuse Mark
DISC SIZE (mm)
34mm
Part Number
CERAMIC SHAPE
S: Square
VM(AC)RMS
115V to 750V
Production Date Dode
(Year and Week)
LF9
SMOV34S321MP
1148
M:With Isolated Monitored Switch
N: Non Isolated Monitored Switch Design
P: Lead-Free and RoHS compliant
Option Codes
www.BDTIC.com/littelfuse
© 2014 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 05/23/14
Varistor Products
Thermally Protected Varistors > SMOV34S Series
Device Dimension
Lead Configuration
41Max
20Max
44.5Max
LF 9
Galvanic isolation
P1
LF9
SMOVXXS321MP
SMOV34S321MP
LF9
1148
Galvanic isolation
1209
P1
Thermal
disconnect
S1 ON
(Normal Close)
10Min
10Min
SMOVXXS321MP
1.4±0.2
3*0.6±0.2
1209
1.2±0.3
6.0±0.2
P2
P1
P2
S2 S3 S1
P1
2.5±0.3
P2
P2
Primary side
MOV
S2 OFF
(Normal open)
P1
S3 Common
S2 S3 S1
MOV
S2 S3 S1
21.5±0.2
P2
0.5±0.2
0.3±0.2
S1 ON
S2 (Normal
S3 S1 Close)
S2 OFF
(Normal open)
P1
P2
Primary side
Secondary side
Secondary side
6.5±2.2
Galvanic isolation
P1
Application Example
Thermal
disconnect
Galvanic isolation
P1
Thermal
disconnect
S1 ON
* 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
MOVline ).
S1 ON
S3 Common
R
Note: EXAMPLE ONLY - Connection to S2-S3 and S1-S3
depends on customer indication circuit and can vary.
P2
Secondary side
S2 OFF
Note: EXAMPLE ONLY - Connection to S2-S3 and S1-S3
depends on customer indication circuit and can vary.
P2
Secondary side
Switch Specification
SMOV Switch
Voltage DC
Current (Amps)
Switch
12V
0.1A
Contact Resistance Max. Insulation Resistance Min.
70mΩ
Dialectric Strength
0.5mA/Minute
100MΩ
www.BDTIC.com/littelfuse
© 2014 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 05/23/14
LED
S3 Common
MOV
Primary side
R
S2 OFF
LED
Primary side
* 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 ).
To Protected Circuit
11.0±0.5
6.0±0.2
S3 Common
Thermal
disconnect
3.6±0.3
500VAC
Varistor Products
Thermally Protected Varistors > SMOV34S Series
Term Definitions
Rated AC Voltage (VM(AC)RMS) – MCOV
This is the maximum continuous sinusoidal RMS voltage
that may be applied. This voltage may be applied at any
temperature up to the maximum operating temperature of
the device.
UL 1449
An Underwriters Laboratory standard covering the safety
requirements for Surge Protective Devices intended for
permanently connected, cord-connected and direct plug-in
applications.
Maximum Non-Repetitive Surge Current (ITM)
This is the maximum peak current which may be applied
for a single 8/20µs impulse, with rated line voltage also
applied, without causing device failure. The pulse can
be applied to the device in either polarity with the same
confidence factor.
Limited Current Abnormal Over-voltage Test
An AC over-voltage condition applied to a Surge Protective
Device according to UL 1449, Section 39.4. The short circuit
current is limited by series connected resistors to 10A,
5A, 2.5A, 0.5A and 0.125A. The condition is maintained
for 7 hours or until the device under test is disconnected
from the AC supply or the current or temperature reaches
equilibrium.
Nominal Discharge Current (IN)
Peak value of the current, selected by the manufacturer,
through the SPD having a current waveshape of 8/20µs
where the SPD remains functional after 15 surges.
Voltage Protection Rating (VPR)
A rating selected from a list of preferred values as given
in UL 1449 and assigned to each mode of protection. The
value of VPR is determined as the nearest highest value
taken from UL 1449 to the measured limiting voltage
determined during the transient-voltage surge suppression
test using the combination wave generator at a setting of
6kV, 3kA.
Maximum Non-Repetitive Surge Energy (WTM)
This is the maximum rated transient energy which may be
dissipated for a single current pulse at a specified impulse
duration, with the rated RMS voltage applied, without
causing device failure.
Nominal Voltage (VN(DC))
This is the voltage at which the device changes from the
off (standby state) to the on (clamping state) and enters
its conduction mode of operation. The voltage value is
usually characterised at the 1mA point and has a specified
minimum and maximum voltage range.
www.BDTIC.com/littelfuse
© 2014 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 05/23/14