Varistor Products
Radial Lead Varistors > LA series
RoHS
LA Varistor Series
Description
The LA Series of transient voltage surge suppressors
are radial-lead varistors (MOVs) that are designed to be
operated continuously across AC power lines. These UL
recognized varistors require very little mounting space, and
are offered in various standard lead form options.
The LA Series varistors are available in four model
sizes: 7mm, 10mm, 14mm and 20mm; and have a V
M(AC)
voltage range from 130V to 1000V, and an energy
RMS
absorption capability up to 360J. Some LA series model
numbers are available with clamping voltage selections,
designated by a model number suffix of either A or B.
The ‘A’ selection is the standard model; the ‘B’ selection
provides a lower clamping voltage.
Agency File Number
Agency Approvals
Agency
See LA Series Device Ratings and Specifications table for
part number and brand information.
E75961, E56529, E135010
116895E
LR91788
42201-006
Features
compliant option
available. Please see
the device and ratings
specifications table for
more information.
Capability
) Up to 360J
TM
Range
V
M(AC)RMS
130Vto 1000V
Ambient
or Bulk Pack
Absolute Maximum Ratings
Continuous
Steady State Applied Voltage:
AC Voltage Range (V
M(AC)RMS
)
DC Voltage Range (V
M(DC)
)
Transients:
Peak Pulse Current (I
TM
)
Single Pulse Energy Range
TM
LA Series
130 to 1000
175 to 1200
Units
V
V
1200 to 6500
)
11 to 360
A
J
O
O
Operating Ambient Temperature Range (T
A
)
Storage Temperature Range (T
STG
)
Temperature Coefficient (a
V
) of Clamping Voltage (V
C
) at Specified Test Current
Hi-Pot Encapsulation ( COATING Isolation Voltage Capability)
(Dielectric must withstand indicated DC voltage for one minute per MIL-STD 202, Method 301)
C
C
<0.01
2500
1000
%/
O
C
V
MΩ
COATING Insulation Resistance
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.littelfuse.com
©2008 Littelfuse
41
Revised: January 15, 2008
LA Varistor Series
Specifications are subject to change without notice.
Varistor Products
Radial Lead Varistors > LA series
LA Series Ratings & Specifications
Maximum Rating (85°C)
Specifications (25°C)
Continuous
Transient
Varistor
Maximum
Typical
Voltage at
Energy Peak
Model
Clamping
Capaci-
1mA
10 x Current
Size
Voltage
tance
f
=
V
RMS
V
DC
DC Test
1000
8 x 20
Disc
8 x 20 μs
1MHz
Current
μs
μs
Dia.
(mm)
V
NOM
V
NOM
W
TM
I
TM
I
PK
C
V
C
V
M(AC)
V
M(DC)
Min Max
(V)
(V)
(J)
(A)
(V)
(V)
(V)
(A)
(pF)
7
130
175
11
1200
184
255
390
10
180
7
130
175
11
1200
184
228
340
10
180
10
130
175
20
2500
184
228
340
25
450
14
130
175
38
4500
184
228
340
50
1000
20
130
175
70
6500
184
228
340
100
1900
20
130
175
70
6500
184
220
325
100
1900
7
140
180
12
1200
198
242
360
10
160
10
140
180
22
2500
198
242
360
25
400
14
140
180
42
4500
198
242
360
50
900
20
140
180
75
6500
198
242
340
100
1750
7
150
200
13
1200
212
284
430
10
150
7
150
200
13
1200
212
268
395
10
150
10
150
200
25
2500
212
268
395
25
360
14
150
200
45
4500
212
268
395
50
800
20
150
200
80
6500
212
268
395
100
1600
20
150
200
80
6500
212
243
360
100
1600
7
175
225
15
1200
247
303
455
10
130
10
175
225
30
2500
247
303
455
25
350
14
175
225
55
4500
247
303
455
50
700
20
175
225
90
6500
247
303
455
100
1400
7
230
300
20
1200
324
396
595
10
100
10
230
300
35
2500
324
396
595
25
250
50
550
14
230
300
70
4500
324
396
595
20
230
300
122
6500
324
396
595
100
1100
7
250
330
21
1200
354
473
730
10
90
7
250
330
21
1200
354
429
650
10
90
10
250
330
40
2500
354
429
650
25
220
14
250
330
72
4500
354
429
650
50
500
20
250
330
130
6500
354
429
650
100
1000
20
250
330
130
6500
354
413
620
100
1000
7
275
369
23
1200
389
515
775
10
80
7
275
369
23
1200
389
473
710
10
80
10
275
369
45
2500
389
473
710
25
200
14
275
369
75
4500
389
473
710
50
450
20
275
369
140
6500
389
473
710
100
900
20
275
369
140
6500
389
453
680
100
900
7
300
405
25
1200
420
565
870
10
70
7
300
405
25
1200
420
517
775
10
70
10
300
405
46
2500
420
517
775
25
180
14
300
405
77
4500
420
517
775
50
400
20
300
405
165
6500
420
517
775
100
800
7
320
420
25
1200
462
565
850
10
65
10
320
420
48
2500
462
565
850
25
170
14
320
420
80
4500
462
565
850
50
380
20
320
420
150
6500
462
540
810
100
750
7
385
505
27
1200
558
682 1025
10
60
10
385
505
51
2500
558
682 1025
25
160
Lead-Free RoHS
and RoHS Compliant
Models
Standard
Models
Part
Number
V130LA1P
V130LA2P
V130LA5P
V130LA10AP
V130LA20AP
V130LA20BP
V140LA2P
V140LA5P
V140LA10AP
V140LA20AP
V150LA1P
V150LA2P
V150LA5P
V150LA10AP
V150LA20AP
V150LA20BP
V175LA2P
V175LA5P
V175LA10AP
V175LA20AP
V230LA4P
V230LA10P
V230LA20AP
V230LA40AP
V250LA2P
V250LA4P
V250LA10P
V250LA20AP
V250LA40AP
V250LA40BP
V275LA2P
V275LA4P
V275LA10P
V275LA20AP
V275LA40AP
V275LA40BP
V300LA2P
V300LA4P
V300LA10P
V300LA20AP
V300LA40AP
V320LA7P
V320LA10P
V320LA20AP
V320LA40BP
V385LA7P
V385LA10P
Branding
P1301
P1302
P1305
P130L10
P130L20
P130L20B
P1402
P1405
P140L10
P140L20
P1501
P1502
P1505
P150L10
P150L20
P150L20B
P1752
P1755
P175L10
P175L20
P2304
P230L
P230L20
P230L40
P2502
P2504
P250L
P250L20
P250L40
P250L40B
P2752
P2754
P275L
P275L20
P275L40
P275L40B
P3002
P3004
P300L
P300L20
P300L40
P3207
P320L
P320L20
P320L40
P3857
P385L
Part
Number
V130LA1
V130LA2
V130LA5
V130LA10A
130LA20A
V130LA20B
V140LA2
V140LA5
V140LA10A
V140LA20A
V150LA1
V150LA2
V150LA5
V150LA10A
V150LA20A
V150LA20B
V175LA2
V175LA5
V175LA10A
V175LA20A
V230LA4
V230LA10
V230LA20A
V230LA40A
V250LA2
V250LA4
V250LA10
V250LA20A
V250LA40A
V250LA40B
V275LA2
V275LA4
V275LA10
V275LA20A
V275LA40A
V275LA40B
V300LA2
V300LA4
V300LA10
V300LA20A
V300LA40A
V320LA7
V320LA10
V320LA20A
V320LA40B
V385LA7
V385LA10
Branding
1301
1302
1305
130L10
130L20
130L20B
1402
1405
140L10
140L20
1501
1502
1505
150L10
150L20
150L20B
1752
1755
175L10
175L20
2304
230L
230L20
230L40
2502
2504
250L
250L20
250L40
250L40B
2752
2754
275L
275L20
275L40
275L40B
3002
3004
300L
300L20
300L40
3207
320L
320L20
320L40
3857
385L
LA Varistor Series
Specifications are subject to change without notice.
42
Revised: January 15, 2008
www.littelfuse.com
©2008 Littelfuse
Varistor Products
Radial Lead Varistors > LA series
LA Series Ratings & Specifications
(Continued...)
Maximum Rating (85°C)
Specifications (25°C)
Continuous
Transient
Varistor
Maximum
Typical
Voltage at
Energy Peak
Model
Clamping
Capaci-
1mA
10 x Current
Size
Voltage
tance
f
=
V
RMS
V
DC
DC Test
1000
8 x 20
Disc
8 x 20 μs
1MHz
Current
μs
μs
Dia.
(mm)
V
NOM
V
NOM
W
TM
I
TM
I
PK
C
V
C
V
M(AC)
V
M(DC)
Min Max
(V)
(V)
(J)
(A)
(V)
(V)
(V)
(A)
(pF)
14
385
505
85
4500
558
682 1025
50
360
20
385
505
160
6500
558
682 1025 100
700
7
420
560
30
1200
610
748 1120
10
55
10
420
560
55
2500
610
748 1120
25
140
14
420
560
90
4500
610
748 1120
50
300
20
420
560
160
6500
610
720 1060 100
600
7
460
615
37
1200
702
858 1130
10
55
7
480
640
35
1200
670
825 1240
10
50
10
480
640
60
2500
670
825 1240
25
120
14
480
640
105
4500
670
825 1240
50
270
20
480
640
180
6500
670
790 1160 100
550
10
510
675
63
2500
735
910 1350
25
100
14
510
675
110
4500
735
910 1350
50
250
20
510
675
190
6500
735
860 1280 100
500
10
575
730
65
2500
805 1000 1500
25
90
14
575
730
120
4500
805 1000 1500
50
220
20
575
730
220
6500
805
960 1410 100
450
10
625
825
67
2500
900 1100 1650
25
80
14
625
825
125
4500
900 1100 1650
50
210
20
625
825
230
6500
900 1100 1650 100
425
10
680
875
75
2500
990 1240 1875
25
65
14
680
875
145
4500
990 1240 1875
50
190
380
20
680
875
260
6500
990 1130 1700 100
10
660
850
70
2500
940 1210 1820
25
70
14
660
850
140
4500
940 1210 1820
50
200
20
660
850
250
6500
940 1100 1650 100
400
14
1000 1200
220
4500 1425 1800 2700
50
130
20
1000 1200
360
6500 1425 1600 2420 100
250
Lead-Free RoHS
and RoHS Compliant
Models
Standard
Models
Part
Number
V385LA20AP
V385LA40BP
V420LA7P
V420LA10P
V420LA20AP
V420LA40BP
V460LA7P
V480LA7P
V480LA10P
V480LA40AP
V480LA80BP
V510LA10P
V510LA40AP
V510LA80BP
V575LA10P
V575LA40AP
V575LA80BP
V625LA10P
V625LA40AP
V625LA80BP
V680LA10P
V680LA80AP
V680LA100BP
V660LA10P
V660LA50AP
V660LA100BP
V1000LA80AP
V1000LA160BP
Branding
P385L20
P385L40
P4207
P420L
P420L20
P420L40
P4607
P4807
P480L
P480L40
P480L80
P510L
P510L40
P510L80
P575L
P575L40
P575L80
P625L
P625L40
P625L80
P680L
P680L80
P680L100
P660L
P660L50
P660L100
P1000L8
P1000L16
Part
Number
V385LA20A
V385LA40B
V420LA7
V420LA10
V420LA20A
V420LA40B
V460LA7
V480LA7
V480LA10
V480LA40A
V480LA80B
V510LA10
V510LA40A
V510LA80B
V575LA10
V575LA40A
V575LA80B
V625LA10
V625LA40A
V625LA80B
V680LA10
V680LA80A
V680LA100B
V660LA10
V660LA50A
V660LA100B
V1000LA80A
V1000LA160B
Branding
385L20
385L40
4207
420L
420L20
420L40
4607
4807
480L
480L40
480L80
510L
510L40
510L80
575L
575L40
575L80
625L
625L40
625L80
680L
680L80
680L100
660L
660L50
660L100
1000L80
1000L160
www.littelfuse.com
©2008 Littelfuse
43
Revised: January 15, 2008
LA Varistor Series
Specifications are subject to change without notice.
Varistor Products
Radial Lead Varistors > LA series
Power Dissipation Ratings
Should transients occur in rapid succession, the average
power dissipation is the energy (watt-seconds) per pulse
times the number of pulses per second. The power so
developed must be within the specifications shown on the
Device Ratings and Specifications table for the specific
device.The operating values of a MOV need to be derated
at high temperatures as shown above. Because varistors
only dissipate a relatively small amount of average power
they are not suitable for repetitive applications that involve
substantial amounts of average power dissipation.
Current Energy and Power Derating Curve
Peak Pulse Current Test Waveform
PERCENT OF PEAK VALUE
100
90
50
10
O
1
T
T
1
T
2
TIME
100
TED VALUE
90
80
70
60
50
40
30
20
10
0
-55
50
60
70
80
90
100
110
120
130
140 150
PERCENT OF RA
O
1
= Virtual Origin of Wave
T = Time From 10% to 90% of Peak
t
T
1
= Virtual Front
T
2
= Virtual Time to Half Value (Impulse Duration)
Example: For an 8/20μs Current Waveform:
8μs = T
1
= Virtual Front Time
20μs = T
2
= Virtual Time to Half Value
AMBIENT TEMPERA TURE (
o
C)
LA Varistor Series
Specifications are subject to change without notice.
44
Revised: January 15, 2008
www.littelfuse.com
©2008 Littelfuse
Varistor Products
Radial Lead Varistors > LA series
Transient V-I Characteristics Curves
Maximum Clamping Voltage for 7mm Parts
Pulse Rating Curves
Repetetive Surge Capability for 7mm Parts
2,000
6,000
5,000
4,000
3,000
1
SURGE CURRENT (A)
MAXIMUM CLAMPING VOLTAGE
MODEL SIZE 7mm
130 TO 300V
M(AC)
RATING
T
A
= -55
o
C TO 85
o
C
1,000
500
200
100
50
20
10
5
INDEFINITE
2
10
10
2
MODEL SIZE 7mm
V130LA1(P) - V480LA7(P)
10
3
10
4
10
5
10
6
MAXIMUM PEAK VOLTS (V)
2,000
V275LA2(P)
V250LA2(P)
1,000
900
800
700
600
500
400
300
V130LA1(P)
200
10
-3
10
-2
10
-1
10
0
10
1
10
2
PEAK AMPERES (A)
10
3
10
4
V300LA2(P)
V150LA1(P)
2
1
20
100
1,000
IMPULSE DURA
TION (
μs)
10,000
4,000
3,000
2,000
MAXIMUM CLAMPING VOLTAGE
MODEL SIZE 7mm
130 TO 300V
M(AC)
RATING
T
A
= -55
o
C TO 85
o
C
V300LA4(P)
V275LA4(P)
V250LA4(P)
V230LA4(P)
MAXIMUM PEAK VOLTS (V)
1,000
900
800
700
600
500
400
300
200
V175LA2(P)
V150LA2(P)
V140LA2(P)
V130LA2(P)
10
-2
10
-1
10
0
10
1
10
2
PEAK AMPERES (A)
10
3
10
4
100
10
-3
MAXIMUM PEAK VOLTS (V)
MAXIMUM CLAMPING VOLTAGE
5,000 MODEL SIZE 7mm
320 TO 480V
M(AC)
RATING
T
A
= -55
o
C TO 85
o
C
3,000
V460LA7
(P)
V480LA7
(P)
2,000
1,000
V420LA7
(P)
V385LA7
(P)
V320LA7
(P)
500
10
-3
10
-2
10
-1
10
0
10
1
PEAK AMPERES (A)
10
2
10
3
10
4
www.littelfuse.com
©2008 Littelfuse
45
Revised: January 15, 2008
LA Varistor Series
Specifications are subject to change without notice.
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