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.
Device Ratings and Specifications
(Note 1)
MAXIMUM RATING (85
o
C)
CONTINUOUS
TRANSIENT
ENERGY 10
x 1000µs
W
TM
(J)
0.1
0.4
0.8
0.14
0.6
1.2
0.17
0.8
1.5
3.5
80 (Note 2)
0.2
0.9
2
4
100 (Note 2)
0.25
1
2.5
5
120 (Note 2)
PEAK
CURRENT
8 x 20µs
I
TM
(A)
50
100
250
50
100
250
100
250
500
1000
2000
100
250
500
1000
2000
100
250
500
1000
2000
6
6
6
9
9
9
14.4
14.4
14.4
14.4
14.4
(Note 3)
18.7
18.7
18.7
18.7
19.2
(Note 3)
23
23
23
23
23
(Note 3)
VARISTOR VOLT-
AGE AT 1mA DC
TEST CURRENT
V
NOM
MIN
(V)
11
11
11
16
16
16
21.6
21.6
21.6
21.6
21.6
26
26
26
26
26
31.1
31.1
31.1
31.1
31.1
V
NOM
MAX
SPECIFICATIONS (25
o
C)
MAXIMUM
CLAMPING
VOLTAGE
8 x 20µs
V
C
(V)
30
22
20
37
34
30
36
36
36
36
37
43
43
43
43
43
53
53
53
53
50
I
PK
(A)
1
2.5
5
1
2.5
5
1
2.5
5
10
20
1
2.5
5
10
20
1
2.5
5
10
20
TYPICAL
CAPACI-
TANCE
f = 1MHz
C
(pF)
1400
3000
7500
1200
2500
6000
1000
2000
5000
11000
22000
800
1600
4000
9000
18000
600
1300
3000
7000
13000
PART
NUMBER
V8ZA05
V8ZA1
V8ZA2
V12ZA05
V12ZA1
V12ZA2
V18ZA05
V18ZA1
V18ZA2
V18ZA3
V18ZA40
V22ZA05
V22ZA1
V22ZA2
V22ZA3
V24ZA50
V27ZA05
V27ZA1
V27ZA2
V27ZA4
V27ZA60
MODEL
SIZE
DISC
DIA. (mm)
5
7
10
5
7
10
5
7
10
14
20
5
7
10
14
20
5
7
10
14
20
V
RMS
V
M(AC)
BRAND
Z08
08Z1
08Z2
Z12
12Z1
12Z2
Z18
18Z1
18Z2
18Z3
18Z40
Z22
22Z1
22Z2
22Z3
24Z50
Z27
27Z1
27Z2
27Z4
27Z60
(V)
4
4
4
6
6
6
10
10
10
10
10
14
14
14
14
14
17
17
17
17
17
V
DC
V
M(DC)
(V)
5.5
5.5
5.5
8
8
8
14
14
14
14
14
18
18
18
18
18
(Note 4)
22
22
22
22
22
w w w. l i t t e l f u s e . c o m
72
Varistor Products
Low to Medium Voltage, Radial Lead
ZA Varistor Series
Device Ratings and Specifications
(Note 1)
(Continued)
MAXIMUM RATING (85
o
C)
CONTINUOUS
TRANSIENT
ENERGY 10
x 1000µs
W
TM
(J)
0.3
1.2
3
6
150 (Note 2)
160 (Note 2)
0.3
1.2
3
6
20
0.4
1.8
4.5
8.8
23
0.5
2.3
5.5
10
30
0.6
3
6.5
13
33
2
4
8
15
2.5
5
10
20
PEAK
CURRENT
8 x 20µs
I
TM
(A)
100
250
500
1000
2000
2000
100
250
500
1000
2000
100
250
500
1000
2000
100
250
500
1000
2000
100
250
500
1000
2000
400
1200
2500
4500
400
1200
2500
4500
29.5
29.5
29.5
29.5
29.5
(Note 3)
32
(Note 3)
35
35
35
35
35
42
42
42
42
42
50
50
50
50
50
61
61
61
61
61
73
73
73
73
90
90
90
90
SPECIFICATIONS (25
o
C)
MAXIMUM
CLAMPING
VOLTAGE
8 x 20µs
V
C
(V)
38
36.5
36.5
36.5
36.5
40
46
43
43
43
43
55
52
52
52
52
66
62
62
62
62
80
75
75
75
75
97
91
91
91
117
110
110
110
65
65
65
65
58
63
79
79
76
76
76
93
93
93
93
93
110
110
110
110
110
135
135
135
135
135
135
135
135
145
165
165
165
175
I
PK
(A)
1
2.5
5
10
20
20
1
2.5
5
10
20
1
2.5
5
10
20
1
2.5
5
10
20
1
2.5
5
10
20
5
10
25
50
5
10
25
50
TYPICAL
CAPACI-
TANCE
f = 1MHz
C
(pF)
500
1100
2700
6000
13000
12000
500
1100
2700
6000
12000
400
800
2000
4500
11000
360
700
1800
3900
10000
300
600
1500
3300
10000
240
500
1100
2500
180
400
900
2000
PART
NUMBER
V33ZA05
V33ZA1
V33ZA2
V33ZA5
V33ZA70
V36ZA80
V39ZA05
V39ZA1
V39ZA3
V39ZA6
V39ZA20
V47ZA05
V47ZA1
V47ZA3
V47ZA7
V47ZA20
V56ZA05
V56ZA2
V56ZA3
V56ZA8
V56ZA20
V68ZA05
V68ZA2
V68ZA3
V68ZA10
V68ZA20
V82ZA05
V82ZA2
V82ZA4
V82ZA12
V100ZA05
V100ZA3
V100ZA4
V100ZA15
V
M(AC)
BRAND
Z33
33Z1
33Z2
33Z5
33Z70
36Z80
Z39
39Z1
39Z3
39Z6
39Z20
Z47
47Z1
47Z3
47Z7
47Z20
Z56
56Z2
56Z3
56Z8
56Z20
Z68
68Z2
68Z3
68Z10
68Z20
Z82
82Z2
82Z4
82Z12
Z100
100Z
100Z4
100Z15
(V)
20
20
20
20
21
23
25
25
25
25
25
30
30
30
30
30
35
35
35
35
35
40
40
40
40
40
50
50
50
50
60
60
60
60
V
M(DC)
(V)
26
26
26
26
27
31
31
31
31
31
31
38
38
38
38
38
45
45
45
45
45
56
56
56
56
56
68
68
68
68
81
81
81
81
V
NOM
MIN
(V)
V
NOM
MAX
5
7
10
14
20
20
5
7
10
14
20
5
7
10
14
20
5
7
10
14
20
5
7
10
14
20
5
7
10
14
5
7
10
14
73
w w w. l i t t e l f u s e . c o m
VARISTOR
PRODUCTS
MODEL
SIZE
DISC
DIA. (mm)
V
RMS
V
DC
VARISTOR VOLT-
AGE AT 1mA DC
TEST CURRENT
2
Varistor Products
Low to Medium Voltage, Radial Lead
ZA Varistor Series
Device Ratings and Specifications
(Note1)
(Continued)
MAXIMUM RATING (85
o
C)
CONTINUOUS
TRANSIENT
ENERGY 10
x 1000µs
W
TM
(J)
3
6
12
22
33
4
8
15
20
45
5
10
18
35
52
5.5
6
7
7.5
9
9.5
10
11
12
13
14
15.5
17
PEAK
CURRENT
8 x 20µs
I
TM
(A)
400
1200
2500
4500
6500
400
1200
2500
4500
6500
400
1200
2500
4500
6500
400
400
400
400
400
400
400
400
400
400
400
400
400
108
108
108
108
108
135
135
135
135
135
162
162
162
162
162
184
198
216
243
297
324
351
387
420
558
610
643
675
SPECIFICATIONS (25
o
C)
MAXIMUM
CLAMPING
VOLTAGE
8 x 20µs
V
C
(V)
138
132
132
132
132
173
165
165
165
165
207
198
198
198
198
226
253
264
311
380
396
449
495
517
682
748
787
825
205
205
200
210
210
250
250
250
250
250
295
300
300
300
300
340
360
395
455
540
595
650
710
775
1025
1120
1180
1240
I
PK
(A)
5
10
25
50
100
5
10
25
50
100
5
10
25
50
100
5
5
5
5
5
5
5
5
5
5
5
5
5
TYPICAL
CAPACI-
TANCE
f = 1MHz
C
(pF)
140
300
750
1700
1500
120
250
600
1400
1000
100
200
500
1100
2400
100
90
80
70
60
55
50
45
35
33
32
31
30
PART
NUMBER
V120ZA05
V120ZA1
V120ZA4
V120ZA6
V120ZA20
V150ZA05
V150ZA1
V150ZA4
MODEL
SIZE
DISC
DIA. (mm)
5
7
10
14
20
5
7
10
14
20
5
7
10
14
20
5
5
5
5
5
5
5
5
5
5
5
5
5
V
RMS
V
M(AC)
BRAND
Z120
120Z
120Z4
120Z6
120Z20
Z150
Z051
150Z4
150Z8
150Z20
Z180
180Z
180Z5
180Z10
180Z20
Z205
Z220
Z240
Z270
Z330
Z360
Z390
Z430
Z470
Z620
Z680
Z715
Z750
(V)
75
75
75
75
75
92
95
95
95
95
110
115
115
115
115
130
140
150
175
210
230
250
275
300
385
420
440
460
V
DC
V
M(DC)
(V)
102
102
102
102
102
127
127
127
127
127
153
153
153
153
153
170
180
200
225
275
300
330
369
385
505
560
585
615
VARISTOR VOLT-
AGE AT 1mA DC
TEST CURRENT
V
NOM
MIN
(V)
V
NOM
MAX
†
V150ZA8
V150ZA20
V180ZA05
V180ZA1
V180ZA5
V180ZA10
V180ZA20
V205ZA05
†
†
†
†
†
†
†
†
†
†
V220ZA05
V240ZA05
V270ZA05
V330ZA05
V360ZA05
V390ZA05
V430ZA05
V470ZA05
V620ZA05
V680ZA05
V715ZA05
V750ZA05
NOTES:
1. Average power dissipation of transients not to exceed 0.2W, 0.25W, 0.4W, 0.6W or 1W for model sizes 5mm, 7mm, 10mm, 14mm and 20mm,
respectively.
2. Energy rating for impulse duration of 30ms minimum to one half of peak current (auto load dump).
3. 10mA DC test current.
4. Also rated to withstand 24V for 5 minutes.
5. Higher voltages available, contact Littelfuse.
†
Also recognized to UL1449, “Transient Voltage Surge Suppressors” File #E75961.
w w w. l i t t e l f u s e . c o m
74
Varistor Products
Low to Medium Voltage, Radial Lead
ZA Varistor Series
Power Dissipation Ratings
PERCENT OF RATED VALUE
100
90
80
70
60
50
30
20
10
0
-55
50
60
70
80
90
100
110
120
130
140
150
AMBIENT TEMPERATURE (
o
C)
FIGURE 1. CURRENT, ENERGY AND POWER DERATING
CURVE
PERCENT OF PEAK VALUE
100
90
50
O
1
= Virtual Origin of Wave
T = Time From 10% to 90% of Peak
T
1
= Virtual Front time = 1.25 • t
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
10
O
1
T
T
1
T
2
TIME
FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
Transient V-I Characteristics Curves
600
500
400
300
MAXIMUM PEAK VOLTS (V)
200
MAX CLAMPING VOLTAGE
MODEL SIZE 5mm
8 TO 68V
N(DC)
RATING
T
A
= -55
o
C TO 85
o
C
MAXIMUM PEAK VOLTS (V)
2000
V330ZA05
V270ZA05
V240ZA05
V220ZA05
V205ZA05
V180ZA05
V150ZA05
V120ZA05
MAX CLAMPING VOLTAGE
MODEL SIZE 5mm
82 TO 330V
N(DC)
RATING
T
A
= -55
o
C TO 85
o
C
1000
100
90
80
70
60
50
40
500
V68ZA05
V56ZA05
V47ZA05
V39ZA05
V33ZA05
V27ZA05
30 V22ZA05
V18ZA05
20 V12ZA05
V8ZA05
200
5
A0
0Z
0
V1
5
A0
2Z
V8
10
10
-3
10
-2
10
-1
10
0
10
1
10
2
10
3
100
0.0001
0.001
0.01
0.1
1
10
100
1000
PEAK AMPERES (A)
PEAK AMPERES (A)
FIGURE 3. CLAMPING VOLTAGE FOR V8ZA05 - V68ZA05
75
FIGURE 4. CLAMPING VOLTAGE FOR V82ZA05 - V330ZA05
w w w. l i t t e l f u s e . c o m
VARISTOR
PRODUCTS
Should transients occur in rapid succession, the average power dissipation
required is simply 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. Furthermore, the operating values need to be derated
at high temperatures as shown in Figure 1. Because varistors can only
dissipate a relatively small amount of average power they are, therefore,
not suitable for repetitive applications that involve substantial amounts of
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