Littelfuse iTMOV Varistor Series - Manual (Page 3)

© 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
®
/iT
MOV
®
S
eries
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
10 100 1000 10000
Time(s)
0.125A
0.5A
2.5A
5A
Typical
For applications exceeding 85˚C ambient
temperature, the peak surge current and energy
ratings must be reduced as shown in Figure 5.
Figure 5: Peak Current & Energy Derating Curve
0
20
40
60
80
100
-55 50 60 70 80 90 100 110 120 130
AMBIENT TEMPERATURE (ºC)
PERCENT OF RATED VALU
E
Current, Energy, Power Derating Curve
100
1000
10000
0.000001 0.00001 0.0001 0.001 0.01 0.1 1 10 100 1000 10000
Peak Current (A)
Clamping
Vo
ltage (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 0.001 0.01 0.1 1 10 100 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 8/20 µs
Typical
Capaci-
tance
f = 1MHz
AC
Volts
DC
Volts
Energy
2ms
Peak Surge
Current 8/20 µs
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 1100 1650 50 160
TMOV20RP625E P2T625E TMOV20RP625M P2T625M 20 625 825 400 10000 6500 900 1100 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