Varistor Products
Radial Lead Varistors > LA Series
RoHS
LA Varistor Series
Description
The LA Series of transient voltage surge suppressors are
radial leaded 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)RMS
voltage range from 130V to 1000V, and an
energy 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.
See LA Series Device Ratings and Specifications
Table for part number and brand information.
Agency Approvals
Agency
Agency File Number
E320116, E56529, E135010
116895
LR91788
42201-006
Features
• Lead–free, Halogen-
Free and RoHS
compliant.
•
Energy absorption
capability (W
TM
)
up to 360J
Wide operating
voltage range
V
M(AC)RMS
130V to 1000V
•
•
No derating up to
85ºC ambient
Available in tape and
reel or bulk pack
•
Absolute Maximum Ratings
• For ratings of individual members of a series, see Device Ratings and Specifications chart
Continuous
Steady State Applied Voltage:
AC Voltage Range (V
M(AC)RMS
)
DC Voltage Range (V
M(DC)
)
LA Series
130 to 1000
175 to 1200
Units
V
V
Transients:
Peak Pulse Current (I
TM
)
For 8/20μs Current Wave (See Figure 2)
Single Pulse Energy Range
For 10/1000μs Current Wave (W
TM
)
Operating Ambient Temperature Range (T
A
)
Storage Temperature Range (T
STG
)
Temperature Coefficient (a ) 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)
COATING Insulation Resistance
V
1200 to 6500
11 to 360
-55 to +85
-55 to +125
<0.01
2500
1000
A
J
O
O
C
C
%/
O
C
V
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.
©2010 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/la.html for current information.
Revision: August 4, 2010
LA Varistor Series
LA Series
Varistor Products
Radial Lead Varistors > LA Series
LA Series Ratings & Specifications
Maximum Rating (85°C)
Continuous
Transient
Part
Number
Branding
Model Size
Disc Dia.
(mm)
V
RMS
V
M(AC)
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
V385LA20AP
LA Varistor Series
Revision: August 4, 2010
V
DC
V
M(DC)
(V)
175
175
175
175
175
175
180
180
180
180
200
200
200
200
200
200
225
225
225
225
300
300
300
300
330
330
330
330
330
330
369
369
369
369
369
369
405
405
405
405
405
420
420
420
420
505
505
505
Peak
Energy 10
Current 8
x 1000μs
x 20μs
W
TM
(J)
11
11
20
38
70
70
12
22
42
75
13
13
25
45
80
80
15
30
55
90
20
35
70
122
21
21
40
72
130
130
23
23
45
75
140
140
25
25
46
77
165
25
48
80
150
27
51
85
I
TM
(A)
1200
1200
2500
4500
6500
6500
1200
2500
4500
6500
1200
1200
2500
4500
6500
6500
1200
2500
4500
6500
1200
2500
4500
6500
1200
1200
2500
4500
6500
6500
1200
1200
2500
4500
6500
6500
1200
1200
2500
4500
6500
1200
2500
4500
6500
1200
2500
4500
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
P385L20
7
7
10
14
20
20
7
10
14
20
7
7
10
14
20
20
7
10
14
20
7
10
14
20
7
7
10
14
20
20
7
7
10
14
20
20
7
7
10
14
20
7
10
14
20
7
10
14
(V)
130
130
130
130
130
130
140
140
140
140
150
150
150
150
150
150
175
175
175
175
230
230
230
230
250
250
250
250
250
250
275
275
275
275
275
275
300
300
300
300
300
320
320
320
320
385
385
385
Specifications (25°C)
Varistor
Maximum
Typical
Voltage at
Clamping
Capaci-
1mA
Voltage
tance
f
=
DC Test
8 x 20
μs
1MHz
Current
V
NOM
V
NOM
V
C
I
PK
C
Min
Max
(V)
(V)
(V)
(A)
(pF)
184
255
390
10
180
184
228
340
10
180
184
228
340
25
450
184
228
340
50
1000
184
228
340
100
1900
184
220
325
100
1900
198
242
360
10
160
198
242
360
25
400
198
242
360
50
900
198
242
340
100
1750
212
284
430
10
150
212
268
395
10
150
212
268
395
25
360
212
268
395
50
800
212
268
395
100
1600
212
243
360
100
1600
247
303
455
10
130
247
303
455
25
350
247
303
455
50
700
247
303
455
100
1400
324
396
595
10
100
324
396
595
25
250
324
396
595
50
550
324
396
595
100
1100
354
473
730
10
90
354
429
650
10
90
354
429
650
25
220
354
429
650
50
500
354
429
650
100
1000
354
413
620
100
1000
389
515
775
10
80
389
473
710
10
80
389
473
710
25
200
389
473
710
50
450
389
473
710
100
900
389
453
680
100
900
420
565
870
10
70
420
517
775
10
70
420
517
775
25
180
420
517
775
50
400
420
517
775
100
800
462
565
850
10
65
462
565
850
25
170
462
565
850
50
380
462
540
810
100
750
558
682
1025
10
60
558
682
1025
25
160
558
682
1025
50
360
©2010 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/la.html for current information.
Varistor Products
Radial Lead Varistors > LA Series
LA Series Ratings & Specifications
(Continued...)
Maximum Rating (85°C)
Continuous
Transient
Part
Number
Branding
Model Size
Disc Dia.
(mm)
V
RMS
V
M(AC)
V385LA40BP
V420LA7P
V420LA10P
V420LA20AP
V420LA40BP
V460LA7P
V460LA10P
V460LA20AP
V460LA40BP
V480LA7P
V480LA10P
V480LA40AP
V480LA80BP
V510LA10P
V510LA40AP
V510LA80BP
V575LA10P
V575LA40AP
V575LA80BP
V625LA10P
V625LA40AP
V625LA80BP
V680LA10P
V680LA80AP
V680LA100BP
V660LA10P
V660LA50AP
V660LA100BP
V1000LA80AP
V1000LA160BP
P385L40
P4207
P420L
P420L20
P420L40
P4607
P460L
P460L20
P460L40
P4807
P480L
P480L40
P480L80
P510L
P510L40
P510L80
P575L
P575L40
P575L80
P625L
P625L40
P625L80
P680L
P680L80
P680L100
P660L
P660L50
P660L100
P1000L8
P1000L16
20
7
10
14
20
7
10
14
20
7
10
14
20
10
14
20
10
14
20
10
14
20
10
14
20
10
14
20
14
20
(V)
385
420
420
420
420
460
460
460
460
480
480
480
480
510
510
510
575
575
575
625
625
625
680
680
680
660
660
660
1000
1000
V
DC
V
M(DC)
(V)
505
560
560
560
560
615
615
615
615
640
640
640
640
675
675
675
730
730
730
825
825
825
875
875
875
850
850
850
1200
1200
Peak
Energy 10
Current 8
x 1000μs
x 20μs
W
TM
(J)
160
30
55
90
160
37
56
100
170
35
60
105
180
63
110
190
65
120
220
67
125
230
75
145
260
70
140
250
220
360
I
TM
(A)
6500
1200
2500
4500
6500
1200
2500
4500
6500
1200
2500
4500
6500
2500
4500
6500
2500
4500
6500
2500
4500
6500
2500
4500
6500
2500
4500
6500
4500
6500
Specifications (25°C)
Varistor
Maximum
Typical
Voltage at
Clamping
Capaci-
1mA
Voltage
tance
f
=
DC Test
8 x 20
μs
1MHz
Current
V
NOM
V
NOM
V
C
I
PK
C
Min
Max
(V)
(V)
(V)
(A)
(pF)
558
682
1025 100
700
610
748
1120
10
55
610
748
1120
25
140
610
748
1120
50
300
610
720
1060 100
600
640
790
1190
10
55
640
790
1190
25
120
640
790
1190
50
280
640
756
1110 100
560
670
825
1240
10
50
670
825
1240
25
120
670
825
1240
50
270
670
790
1160 100
550
735
910
1350
25
100
735
910
1350
50
250
735
860
1280 100
500
805
1000 1500
25
90
805
1000 1500
50
220
805
960
1410 100
450
900
1100 1650
25
80
900
1100 1650
50
210
900
1100 1650 100
425
990
1240 1875
25
65
990
1240 1875
50
190
990
940
940
940
1425
1425
1130
1210
1210
1100
1800
1600
1700
1820
1820
1650
2700
2420
100
25
50
100
50
100
380
70
200
400
130
250
NOTE: Average power dissipation of transients not to exceed 0.25W, 0.4W, 0.6W or 1W for model sizes 7mm, 10mm, 14mm and 20mm, respectively.
Phenolic Coating Option -- LA Series Varistors for Hi-Temperature Operating Conditions:
•
•
•
•
•
•
Phenolic–coated LA Series devices are available with improved maximum operating maximum temperature 125°C.
These devices also have improved temperature cycling performance capability.
Ratings and Specifications are as per standard LA Series except Hi–Pot Encapsulation (Isolation Voltage Capability) = 500V.
These devices are not UL, CSA, VDE or CECC certified.
To order: add X1347 to end of part number (e.g. V230LA20APX1347)
Product Marking:
Lead-Free,
Halogen-Free
& RoHS Compliant
Indicator
LF 9
P175P10
YYWW
Pholenic Coated
Option
Identifier
©2010 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/la.html for current information.
Revision: August 4, 2010
LA Varistor Series
LA Series
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 in the diagram below.
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
Figure 2
100
PERCENT OF RATED VALUE
90
80
70
60
50
40
30
20
10
0
-55
50
60
70
80
90
100
110
120
130
140 150
0
1
= Virtual Origin of Wave
T = Time from 10% to 90% of Peak
T
1
= Rise Time = 1.25 x T
T
2
= Decay Time
Example
- For an 8/20
μs
Current Waveform:
8μs = T
1
= Rise Time
20μs = T
2
= Decay Time
AMBIENT TEMPERATURE (
o
C)
Figure 1
LA Varistor Series
Revision: August 4, 2010
©2010 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/la.html for current information.
Varistor Products
Radial Lead Varistors > LA Series
Transient V-I Characteristics Curves
Maximum Clamping Voltage for 7mm Parts
V130LA1(P) - V300LA2(P)
6,000
5,000
4,000
3,000
MAXIMUM CLAMPING VOLTAGE
MODEL SIZE 7mm
130 TO 300V
M(AC)
RATING
T
A
= -55
o
C TO 85
o
C
Pulse Rating Curves
Repetitive Surge Capability for 7mm Parts
V130LA1(P) - V480LA7(P)
2,000
1,000
500
1
2
10
200
100
50
20
10
5
2
INDEFINITE
10
2
10
3
10
4
10
5
10
6
MODEL SIZE 7mm
V130LA1(P) - V480LA7(P)
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)
SURGE CURRENT (A)
1
20
100
Figure 3
V130LA2(P) - V300LA4(P)
4,000
3,000
2,000
Figure 4
1,000
IMPULSE DURATION (
μs)
10,000
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
PEAK AMPERES (A)
10
2
10
3
10
4
100
10
-3
Figure 5
V320LA7(P) - V480LA7(P)
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
Figure 6
©2010 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/la.html for current information.
Revision: August 4, 2010
LA Varistor Series
LA Series
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)
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