Varistor products, Surface mount varistors > ch series – Littelfuse CH Varistor Series User Manual
Page 2
© 2013 Littelfuse, Inc.
70
Revised: May 8, 2013
Varistor Products
CH Varistor Series
Surface Mount Varistors > CH Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/CH.html for current information.
Part
Number
Maximum Ratings (125ºC)
Specifications (25ºC)
Continuous
Transient
Varistor Voltage at 1 mA DC
Test Current
Max Clamping Volt V
C
at
Test Current (8/20μs)
Typical
Capacitance
V
RMS
V
DC
Energy
(10/1000μ
s)
Peak Current
(8/20μs)
V
M(AC)
V
M(DC)
W
TM
I
TM
MIN
V
N(DC)
MAX
V
C
I
P
f=1MHz
(V)
(V)
(J)
(A)
(V)
(V)
(V)
(V)
(A)
(pF)
V22CH8
14
18 (Note 3)
1.0 (Note2)
100
18.7
22.0
26.0
47
5
1600
V27CH8
17
22
1.0
100
23.0
27.0
31.1
57
5
1300
V33CH8
20
26
1.0
100
29.5
33.0
36.5
68
5
750
V39CH8
25
31
1.0
100
35.0
39.0
43.0
79
5
700
V47CH8
30
38
1.2
100
42.0
47.0
52.0
92
5
650
V56CH8
35
45
1.4
100
50.0
56.0
62.0
107
5
600
V68CH8
40
56
1.5
100
61.0
68.0
75.0
127
10
500
V120CH8
75
102
2.0
250
108.0
120.0
132.0
200
10
300
V150CH8
95
127
3.0
250
135.0
150.0
165.0
250
10
250
V180CH8
115
153
4.0
250
162.0
180.0
198.0
295
10
120
V200CH8
130
175
4.0
250
184.0
200.0
228.0
340
10
110
V220CH8
140
180
5.0
250
198.0
220.0
242.0
360
10
105
V240CH8
150
200
5.0
250
212.0
240.0
268.0
395
10
100
V360CH8
230
300
6.0
250
324.0
360.0
396.0
595
10
70
V390CH8
250
330
7.0
250
354.0
390.0
429.0
650
10
60
V430CH8
275
369
8.0
250
389.0
430.0
473.0
710
10
50
Device Ratings and Specifications
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 file #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 specifications shown on the Device Ratings and
Specifications Table for the specific 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
are, therefore, not suitable for repetitive applications that
involve substantial amounts of average power dissipation.
100
90
80
70
60
50
40
30
20
10
0
-55
50
60
70
80
90
100
110
120
130
140
150
AMBIENT TEMPERATURE ( oC)
PERCENT OF R
A
TED
V
ALUE
Figure 1