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Varistor Products
Surface Mount Varistors > CH Series
Device Ratings and Speci?cations
Maximum Ratings (125oC)
Speci?cations (25oC)
Part
Number
Continuous
V RMS V DC
Transient
Energy Peak Current
(10/1000 μ s) (8/20 μ s)
Varistor Voltage at 1 mA DC Max Clamping Volt V C at
Test Current Test Current (8/20 μ s)
Typical
Capacitance
V M(AC)
(V)
V M(DC)
(V)
W TM
(J)
I TM
(A)
MIN
(V)
V N(DC)
(V)
MAX
(V)
V C
(V)
I P
(A)
f=1MHz
(pF)
V22CH8
V27CH8
V33CH8
V39CH8
V47CH8
V56CH8
V68CH8
V120CH8
V150CH8
V180CH8
V200CH8
V220CH8
V240CH8
V360CH8
V390CH8
V430CH8
14
17
20
25
30
35
40
75
95
115
130
140
150
230
250
275
18 (Note 3)
22
26
31
38
45
56
102
127
153
175
180
200
300
330
369
1.0 (Note2)
1.0
1.0
1.0
1.2
1.4
1.5
2.0
3.0
4.0
4.0
5.0
5.0
6.0
7.0
8.0
100
100
100
100
100
100
100
250
250
250
250
250
250
250
250
250
18.7
23.0
29.5
35.0
42.0
50.0
61.0
108.0
135.0
162.0
184.0
198.0
212.0
324.0
354.0
389.0
22.0
27.0
33.0
39.0
47.0
56.0
68.0
120.0
150.0
180.0
200.0
220.0
240.0
360.0
390.0
430.0
26.0
31.1
36.5
43.0
52.0
62.0
75.0
132.0
165.0
198.0
228.0
242.0
268.0
396.0
429.0
473.0
47
57
68
79
92
107
127
200
250
295
340
360
395
595
650
710
5
5
5
5
5
5
10
10
10
10
10
10
10
10
10
10
1600
1300
750
700
650
600
500
300
250
120
110
105
100
70
60
50
NOTES:
1. Power dissipation of transients not to exceed 0.25W.
2. Energy rating for impulse duration of 30ms minimum to one half of peak current value.
3. Also rated to withstand 24V for 5 minutes.
4. All Littelfuse CH Series Varistors are recognized under UL ?le #E320116 as a recognized component.
5. The Typical Capacitance is for reference only
Current, Energy and Power Derating Curve
Continuous power dissipation capability is not an applicable
design requirement for a suppressor, unless transients
occur in rapid succession. Under this condition, 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 speci?cations shown on the Device Ratings and
Speci?cations Table for the speci?c device. Furthermore,
the operating values need to be derated at high tempera
tures as shown in this diagram. Because varistors can only
dissipate a relatively small amount of average power they
100
90
80
70
60
50
40
30
20
10
are, therefore, not suitable for repetitive applications that
involve substantial amounts of average power dissipation.
Figure 1
0
-55
50
60
70 80 90 100 110 120
AMBIENT TEMPERATURE ( o C)
130
140
150
CH Varistor Series
Revision: August 30, 2010
?2010 Littelfuse, Inc.
Speci?cations are subject to change without notice.
Please refer to www.littelfuse.com/series/CH.html for current information.
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