metal-oxide varistors (MOVs) manufactured in leadless
chip form. They are intended for use in a variety of
applications from low voltage DC to off-line board-level
protection. These devices, which have significantly
lower profiles than traditional radial lead varistors,
permit designers to reduce the size and weight and
increase the reliability of their equipment designs.
CH Series varistors are available in a voltage range from
14V to 275V (V
M(AC)RMS
), and energy ratings up to 8J.
See the Littelfuse Multilayer Suppressor Series also.
Agency Approvals
Recognized under the components program of
Underwriters Laboratories.
AGENCY
AGENCY FILE NUMBER
UL E320116
Features
reel or bulk pack
mount chip in 5
x 8mm Size
V
M(AC)RMS
14V to 275V
125ºC ambient
Absolute Maximum Ratings
Continuous
Steady State Applied Voltage:
AC Voltage Range (V
M(AC)RMS
)
DC Voltage Range (V
M(DC)
)
Transient:
Peak Pulse Current (I
TM
)
For 8/20μs Current (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 ( V) of Clamping Voltage (V
C
) at Specified Test Current
1.0 to 8.0
-55 to +125
-55 to +150
<0.01
J
ºC
ºC
%/ºC
100 to 250
A
14 to 275
18 to 369
V
V
CH Series
Units
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.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/CH.html for current information.
Varistor Products
Surface Mount Varistors > CH Series
Peak Pulse Current Test Waveform
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
PERCENT OF PEAK VALUE
100
90
50
10
O
1
T
T
1
T
2
TIME
Figure 2
Clamping Voltage for V22CH8 – V68CH8
500
400
300
MAXIMUM PEAK VOLTS (V)
200
100
90
80
70
60
50
40
30
20
Clamping Voltage for V120CH8 – V430CH8
4,000
3,000
MAXIMUM PEAK VOLTS (V)
2,000
MAXIMUM CLAMPING VOLTAGE
MODEL SIZE 5 x 8mm
100 TO 430V
N(DC)
RATING
T
A
= -55
o
C TO 125
o
C
V430CH8
V390CH8
V360CH8
MAXIMUM CLAMPING VOLTAGE
MODEL SIZE 5 x 8mm
22 TO 56V
N(DC)
RATING
T
A
= -55
o
C TO 125
o
C
V68CH8
V56CH8
V47CH8
V39CH8
V33CH8
V27CH8
V22CH8
1,000
900
800
700
600
500
400
300
200 V180CH8
V150CH8
V120CH8
100
10
-3
10
-2
V240CH8
V220CH8
V200CH8
10
10
-3
10
-2
10
-1
10
0
10
1
10
2
10
3
10
-1
Figure 3
PEAK AMPERES (A)
Figure 4
10
0
10
1
10
2
PEAK AMPERES (A)
10
3
10
4
Pulse Rating Curves
Surge Current Rating Curves for V22CH8 - V56CH8
500
200
100
SURGE CURRENT (A)
50
20
10
5
2
1
0.5
0.2
20
100
1,000
IMPULSE DURATION (μs)
10,000
INDEFINITE
Surge Current Rating Curves for V120CH8 - V430CH8
2,000
MODEL SIZE 5 x 8mm
V120CH8 - V430CH8
1
2
10
10
2
10
3
10
4
10
5
1
2
10
10
2
10
3
MODEL SIZE 5 x 8mm
V22CH8 - V56CH8
10
4
1,000
500
SURGE CURRENT (A)
10
5
200
100
50
20
10
5
2
1
20
10
6
10
6
INDEFINITE
100
1,000
IMPULSE DURATION (μs)
10,000
Figure 5
Figure 6
NOTE: If pulse ratings are exceeded, a shift of V
N(DC)
(at specified current) of more than +/-10% could result. This type of shift, which normally results in a decrease of V
N(DC)
, may result in
the device not meeting the original published specifications, but it does not prevent the device from continuing to function, and to provide ample protection.
