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Varistor Products
Surface Mount Varistors > CH Series
RoHS CH Varistor Series
Agency Approvals
Recognized under the components program of
Underwriters Laboratories.
AGENCY
AGENCY FILE NUMBER
UL E320116
Description
CH Series transient surge suppressors are small,
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 (VM(AC)RMS), and energy ratings up to 8J.
See the Littelfuse Multilayer Suppressor Series also.
Features
t -FBEoGSFF
t -FBEMFTT TVSGBDF
mount chip in 5
x 8mm Size
t 7PMUBHFSBUJOHT
VM(AC)RMS 14V to 275V
t 4VQQMJFEJOUBQFBOE
reel or bulk pack
t /PEFSBUJOHVQUP
125ºC ambient
Absolute Maximum Ratings
t'PSSBUJOHTPGJOEJWJEVBMNFNCFSTPGBTFSJFT TFF%FWJDF3BUJOHTBOE4QFDJmDBUJPOTDIBSU
Continuous
Steady State Applied Voltage:
Transient:
AC Voltage Range (VM(AC)RMS)
DC Voltage Range (VM(DC))
Peak Pulse Current (ITM)
For 8/20μs Current (See Figure 2)
Single Pulse Energy Range
For 10/1000μs Current Wave (WTM)
Operating Ambient Temperature Range (TA)
Storage Temperature Range (TSTG)
Temperature Coefficient (DV) of Clamping Voltage (VC) at Specified Test Current
CH Series
14 to 275
18 to 369
100 to 250
1.0 to 8.0
-55 to +125
-55 to +150
<0.01
Units
V
V
A
J
ºC
ºC
%/ºC
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/CH.html for current information.
Revision: August 30, 2010
CH Varistor Series

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Varistor Products
Surface Mount Varistors > CH Series
Device Ratings and Specifications
Part
Number
Maximum Ratings (125ºC)
Continuous
VRMS
VM(AC)
(V)
VDC
VM(DC)
(V)
Transient
Energy
(10/1000μ s)
WTM
(J)
Peak Current
(8/20μs)
ITM
(A)
Specifications (25ºC)
Varistor Voltage at 1 mA DC Max Clamping Volt VC at
Test Current
Test Current (8/20μs) Typical
Capacitance
MIN
(V)
VN(DC)
(V)
MAX
(V)
VC
(V)
IP f=1MHz
(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
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
Figure 1
AMBIENT TEMPERATURE ( oC)
CH Varistor Series
Revision: August 30, 2010
©2010 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/CH.html for current information.

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Varistor Products
Surface Mount Varistors > CH Series
Peak Pulse Current Test Waveform
100
90
50
10
O1
Figure 2
T
T1
T2
TIME
Clamping Voltage for V22CH8 – V68CH8
500
400 MAXIMUM CLAMPING VOLTAGE
300 MODEL SIZE 5 x 8mm
22 TO 56VN(DC) RATING
200 TA = -55oC TO 125oC
100
90
80
V68CH8
70 V56CH8
60 V47CH8
50 V39CH8
40
V33CH8
V27CH8
30 V22CH8
20
10
10-3
Figure 3
10-2
10-1
100
101
PEAK AMPERES (A)
102 103
01 = Virtual Origin of Wave
T = Time from 10% to 90% of Peak
T1 = Rise Time = 1.25 x T
T2 = Decay Time
Example:
For an 8/20 μs Current Waveform:
8μs = T1 = Rise Time
20μs = T2 = Decay Time
Clamping Voltage for V120CH8 – V430CH8
4,000
3,000
2,000
1,000
900
800
700
600
500
400
MAXIMUM CLAMPING VOLTAGE
MODEL SIZE 5 x 8mm
1T0A0=T-O554o3C0VTON(D12C5) oRCATING
V240CH8
V220CH8
V200CH8
V430CH8
V390CH8
V360CH8
300
200
V180CH8
V150CH8
V120CH8
100
10-3
Figure 4
10-2
10-1
100
101
102
PEAK AMPERES (A)
103 104
Pulse Rating Curves
Surge Current Rating Curves for V22CH8 - V56CH8
Surge Current Rating Curves for V120CH8 - V430CH8
500
1
200 2
100 10
50 102
103
20
10
5
MODEL SIZE 5 x 8mm
V22CH8 - V56CH8
104
105
106
2 INDEFINITE
1
0.5
0.2
Figure 5 20
100 1,000
IMPULSE DURATION (μs)
10,000
2,000
1,000
500 1
2
200
10
100
50
MODEL SIZE 5 x 8mm
V120CH8 - V430CH8
102
103
104
105
20 106
10
5
INDEFINITE
Figure 6
2
1
20
100 1,000
IMPULSE DURATION (μs)
10,000
NOTE: If pulse ratings are exceeded, a shift of VN(DC) (at specified current) of more than +/-10% could result. This type of shift, which normally results in a decrease of VN(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.
©2010 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/CH.html for current information.
Revision: August 30, 2010
CH Varistor Series