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Littelfuse iTMOV Varistor Series Manual de usuario Pagina 3

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© 2013 Littelfuse, Inc.
209
Revised: October 21, 2013
Varistor Products
TMOV
®
and i TMOV
®
Varistor Series
Radial Lead Varistors > TMOV
®
and iTMOV
®
Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/tmov.html for current information.
TMOV
®
/iTMOV
®
Series
Note:TheTMOV
®
andiTMOV
®
varistorsareintended,in
conjunctionwithappropriateenclosuredesign,tohelpfacilitate
SPDmodulecompliancetoUL1449,3rdEditionSection39.4
(abnormalovervoltagelimitedcurrentrequirements).Underthese
extremeabnormalovervoltageconditions,someunitswillexhibit
substantialheating,arcingandventingpriortoopening.Modules
shouldbedesignedtocontainthispossibility.Applicationtestingis
stronglyrecommended.
Thermal Characteristics
* Figure 4: Typical time to open circuit under UL1449
Abnormal Overvoltage Limited Current Test
0.1
1
10
10 10 0100010000
Time(s)
0.125A
0.5A
2.5A
5A
Typical
For applications exceeding 85˚C ambient
temperature, the peak surge current and energy
ratin
g
s must be reduced as shown in Fi
g
ure 5.
Figure 5: Peak Current & Energy Derating Curve
0
20
40
60
80
100
-555060708090 100 110 120 130
AMBIENT TEMPERATURE (ºC)
PERCENT OF RATED VALU
E
Current, Energy, Power Derating Curve
100
1000
10000
0.000001 0.000010.0001 0.001 0.01 0.11 10 1001000 10000
Peak Current (A)
Clamping Voltage (V)
175V
150V
140V
130V
320V
300V
275V
250V
230V
Figure 6: V-I Characteristic Curves for 14mm Types
420V
385V
115V
Maximum Leakage Current
Maximum Clamping Voltage
14mm
200V
460V
510V
550V
575V
625V
750V
Maximum Clamping Voltage for 14mm Parts
Maximum Clamping Voltage for 20mm Parts
100
1000
10000
0.000001 0.00001 0.0001 0.0010.010.1 110 100 1000 10000
Peak Current (A)
Clamping Voltage (V)
175V
150V
140V
130V
320V
275V
250V
230V
Figure 7: V-I Characteristic Curves for 20mm Types
420V
385V
115V
Maximum Leakage Current
Maximum Clamping Voltage
20mm
200V
460V
510V
550V
575V
625V
750V
300V
Forapplicationsexceeding85°Cambienttemperature,thepeak
surgecurrentandenergyratingsmustbereducedasshown
above.
Figure 1
Figure 2
Figure 3
Figure 4
TMOV and iTMOV
®
Ratings & Specifications
TMOV
Lead–free And RoHS
Compliant Models
iTMOV
Lead–free and RoHS
Compliant Models
Disc
Diameter
Maximum Rating (85°C) Specifications (25°C)
Continuous Transient
Varistor Voltage
at 1mA Test
Current
Maximum
Clamping
Voltage 8/20µs
Typical
Capaci-
tance
f = 1MHz
AC
Volts
DC
Volts
Energy
2ms
Peak Surge
Current 8/20µs
Part
Number
Branding
Part
Number
Branding
V
M(AC)RMS
V
M(DC)
W
TM
I
TM
1 ×
Pulse
I
TM
2 ×
Pulse
V
N(DC)
Min
V
N(DC)
Max V
C
I
PK
C
(mm) (V) (V) (J) (A) (A) (V) (V) (A) (pF)
TMOV14RP575E P4T575E TMOV14RP575M P4T575M
14 575 730 195 6000 4500 856 1047 1568 50 170
TMOV20RP575E P2T575E TMOV20RP575M P2T575M
20 575 730 375 10000 6500 856 1047 1568 100 275
TMOV14RP625E P4T625E TMOV14RP625M P4T625M
14 625 825 200 6000 4500 900 110 0 1650 50 160
TMOV20RP625E P2T625E TMOV20RP625M P2T625M
20 625 825 400 10000 6500 900 110 0 1650 100 250
TMOV14RP750E P4T750E TMOV14RP750M P4T750M
14 750 970 210 6000 4500 1080 1320 1980 50 140
TMOV20RP750E P2T750E TMOV20RP750M P2T750M
20 750 970 480 10000 6500 1080 1320 1980 100 175
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