Varistor Products
Thermally Protected Varistors > SMOV25S Series
RoHS
SMOV25S Varistor Series
Description
Agency Approvals
Agency
Agency File Number
Features
Applications
©2012 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/smov25s.html for current information.
Revision: May 24, 2012
SMOV25S Varistor Series
SMOV25S Series
Varistor Products
Thermally Protected Varistors > SMOV25S Series
Absolute Maximum Ratings
SMOV25S Series
Continous:
Steady State Applied Voltage:
Units
Transient:
J
Device Ratings & Specifications
Maximum Rating (75°C)
Continuous
Part
Number
AC
Volts
V
(V)
DC
Volts
V
(V)
Energy
2ms
W
(J)
Transient
Peak Surge
Current
8/20μs
I
1 × Pulse
(A)
Nominal
Discharge
Current (In)
In
(A)
Varistor
Voltage at
1mA Test
Current
V
Min
V
Max
(V)
Specifications (25 °C)
Maximum
Clamping
Voltage
8/20μs
Vc
(V)
I
(A)
Typical
Capacitance
f = 1MHz
C
(pF)
SMOV25S Varistor Series
Revision: May 24, 2012
©2012 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/smov25s.html for current information.
Varistor Products
Thermally Protected Varistors > SMOV25S Series
Thermal Characteristics
Peak Current & Energy Derating Curve
10
100
PERCENT OF RATED VALUE
80
Typical
Current (A)
10 A
1
5A
2.5 A
0.5 A
60
40
20
0
- 45
50
60
70
80
90
100
110
120
130
0.1
1
10
100
AMBIENT TEMPERATURE (ºC)
Figure 1
Figure 2
Transient V–I Characteristic Curves
10000
750
625
550
510
Maximum Peak Voltage (V)
460
385
420
440
1000
320
275
140
115
100
10μA
100μA
1mA
10mA
100mA
1A
10A
100A
1000A
10000A
100000A
130
150
175
230
250
300
Figure 3
Peak Current
©2012 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/smov25s.html for current information.
Revision: May 24, 2012
SMOV25S Varistor Series
SMOV25S Series
Varistor Products
Thermally Protected Varistors > SMOV25S Series
SMOV25S Pulse Rating Curve
100000
1
2
10000
15
10
2
3
10
1000
10
5
10
10
100
∞
6
4
10
1
10
100
Impulse Duration (secs)
1000
10000
Figure 4
Wave Solder Profile
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
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
Figure 5
TIME(MINUTES)
Figure 6
TIME(MINUTES)
Physical Specifications
Environmental Specifications
Operating/Storage Temp.
Lead Material
Passive Aging
Soldering
Characteristics
Insulating Material
Humidity Aging
Thermal Shock
Solvent Resistance
Moisture Sensitivity
SMOV25S Varistor Series
Revision: May 24, 2012
©2012 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/smov25s.html for current information.
Device Labeling
Varistor Products
Thermally Protected Varistors > SMOV25S Series
Product Dimensions
31Max
16.5Max
Lead Configuration
P1
LF 9
LF9
SMOVXXS321MP
SMOV25S321MP
1148
1209
Thermal
disconnect
S1 ON
(Normal Close)
S3 Common
10Min
9Min
1.4±0.2
3*0.6±0.2
1.3±0.3
0.3±0.2
2±0.3
P2
S2 S3 S1
P1
S2 S3 S1
P2
MOV
S2 O
FF
(Normal open)
3.5±0.2
0.5±0.2
3.5±0.2
P1
P2
2.5±0.3
8.5±0.5
13.4±0.2
Primary side
Secondary side
4.0±1.2
Application Example
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 ).
Thermal
disconnect
S1 ON
R
S3 Common
LED
MOV
S2 O
FF
Note: EXAMPLE ONLY - Connection to S2-S3 and
S1-S3 depends on customer indication circuit and can
vary.
P2
Primary side
Secondary side
Switch Specification
SMOV Switch
Voltage DC
Current (Amps)
Contact Resistance Max. Insulation Resistance Min.
Dialectric Strength
0.5mA/Minute
©2012 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/smov25s.html for current information.
Revision: May 24, 2012
To Protected Circuit
SMOV25S Varistor Series
SMOV25S Series
Galvanic isolation
36Max
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