Metal-Oxide Varistors (MOVs)
Surface Mount Varistors > CH Series
CH Varistor Series
RoHS
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.
Agency Approvals
Recognized under the components program of
Underwriters Laboratories.
Agency
Features
• RoHS compliant
Agency Approval
Agency File Number
UL1449
E320116
• Supplied in tape and
reel or bulk pack
• Leadless, surface
mount chip in 5
x 8mm Size
• No derating up to
125ºC ambient
• Voltage ratings
VM(AC)RMS 14V to 275V
• High surge rated
up to 600A
Absolute Maximum Ratings
• For ratings of individual members of a series, see Device Ratings and Specifications chart
Continuous
CH Series
Units
Steady State Applied Voltage
AC Voltage Range (VM(AC)RMS)
14 to 275
V
DC Voltage Range (VM(DC))
18 to 369
V
100 to 600
A
Transient
Peak Pulse Current (ITM)
For 8/20µs Current (See Figure 2)
Single Pulse Energy Range
1.0 to 8.0
J
Operating Ambient Temperature Range (TA)
For 10/1000µs Current Wave (WTM)
-40 to +125
ºC
Storage Temperature Range (TSTG)
-40 to +150
ºC
CH Series
Device Ratings and Specifications
Maximum Ratings (125ºC)
Continuous
Part
Number
V22CH8
Specifications (25ºC)
Transient
VRMS
VDC
Energy
(10/1000µ s)
VM(AC)
VM(DC)
WTM
Peak Current
(8/20µs)
ITM
Varistor Voltage at 1 mA DC Test
Current
MIN
VN(DC)
Max Clamping Volt VC at
Test Current (8/20µs)
MAX
VC
IP
Typical
Capacitance
f=1MHz
(V)
(V)
(J)
(A)
(V)
(V)
(V)
(V)
(A)
(pF)
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
700
V39CH8
25
31
1.0
100*
35.0
39.0
43.0
79
5
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
2506
108.0
120.0
132.0
200
10
300
6
V150CH8
95
127
3.0
250
135.0
150.0
165.0
250
10
250
V180CH8
115
153
4.0
2506
162.0
180.0
198.0
295
10
120
V200CH8
130
175
4.0
2506
184.0
200.0
228.0
340
10
110
V220CH8
140
180
5.0
2506
198.0
220.0
242.0
360
10
105
V240CH8
150
200
5.0
2506
212.0
240.0
268.0
395
10
100
V360CH8
230
300
6.0
2507
324.0
360.0
396.0
595
10
70
V390CH8
250
330
7.0
2507
354.0
390.0
429.0
650
10
60
V430CH8
275
369
8.0
2507
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. The Typical Capacitance is for reference only.
5. *High Surge Option (up to 400A) available for relevant voltage ratings.
6. High surge option(up to 600A) available for relevant voltage ratings.
7. High surge option(up to 500A) available for relevant voltage ratings.
8. Ultrasonic welding process is not recommended for CH series.
Current, Energy and Power Derating Curve
100
PERCENT OF RATED VALUE
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.
90
80
70
60
50
40
30
20
10
0
-55
Figure 1
50
60
70
80
90
100
110
120
130
140
150
AMBIENT TEMPERATURE ( oC)
FIGURE 1. CURRENT, ENERGY AND POWER DERATING
CURVE
© 2020 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 02/20/20
Metal-Oxide Varistors (MOVs)
Surface Mount Varistors > CH Series
PERCENT OF PEAK VALUE
Peak Pulse Current Test Waveform
01 = Virtual Origin of Wave
T = Time from 10% to 90% of Peak
T1 =Origin
RiseofTime
O1 = Virtual
Wave= 1.25 x T
T2From
= Decay
T = Time
10% Time
to 90% of Peak
Front time = 1.25 • t
T1 = Virtual
Example:
T2 = Virtual
to Half
(Impulse
Duration)
ForTime
an 8/20
µs Value
Current
Waveform:
Example: For an 8/20 s Current Waveform:
8µs = T = Rise Time
8 s = T1 = Virtual 1Front Time
= TTime
= Decay
Virtual
to Half Time
Value
20 s = T2 =20µs
2
100
90
50
10
O1
T
TIME
T1
Figure 2
T2
FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
Clamping Voltage for V22CH8 – V68CH8
500
400
300
4,000
MAXIMUM CLAMPING VOLTAGE
MODEL SIZE 5 x 8mm
22 TO 56VN(DC) RATING
TA = -55oC TO 125 oC
100
90
80
70
60
50
40
V68CH8
V56CH8
V47CH8
V39CH8
V33CH8
V27CH8
V22CH8
30
20
10
10 -3
10 -2
10 -1
Figure 3
10 0
MAXIMUM CLAMPING VOLTAGE
MODEL SIZE 5 x 8mm
100 TO 430VN(DC) RATING
TA = -55oC TO 125 oC
3,000
MAXIMUM PEAK VOLTS (V)
200
MAXIMUM PEAK VOLTS (V)
Clamping Voltage for V120CH8 – V430CH8
10 1
10 2
2,000
1,000
900
800
700
600
500
400
300
200 V180CH8
V150CH8
V120CH8
100
10 -3
10 3
Figure 4
PEAK AMPERES (A)
FIGURE 3. CLAMPING VOLTAGE FOR V22CH8 - V68CH8
V240CH8
V220CH8
V200CH8
V430CH8
V390CH8
V360CH8
10 -2
10 -1
10 0
10 1
10 2
PEAK AMPERES (A)
10 3
10 4
FIGURE 4. CLAMPING VOLTAGE FOR V120CH8 - V430CH8
Pulse Rating Curves
Surge Current Rating Curves for V22CH8 - V56CH8
1
200
10
50
10 2
SURGE CURRENT (A)
100
20
10
5
INDEFINITE
0.2
20
1
10 2
10 3
10 4
10 5
2
100
10
50
25
10
5
10 6
2.5
1
0.5
Figure 5
MODEL SIZE 5 x 8mm
V120CH8 - V430CH8
500
250
10 4
10 5
10 6
10 3
2
1,000
MODEL SIZE 5 x 8mm
V22CH8 - V56CH8
2
SURGE CURRENT (A)
500
Surge Current Rating Curves for V120CH8 - V430CH8
INDEFINITE
1
0.5
100
1,000
IMPULSE DURATION (µs)
10,000
Figure 6
20
100
1,000
10,000
IMPULSE DURATION (µs)
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
FIGURE
SURGE
CURRENT
CURVES
FOR and to provide ample protection.
published specifications,
but it5.does
not prevent
the deviceRATING
from continuing
to function,
V22CH8 - V56CH8
© 2020 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 02/20/20
Metal-Oxide Varistors (MOVs)
Surface Mount Varistors > CH Series
Lead (Pb) Soldering Recommendations
Wave soldering is the most strenuous of the processes.
To avoid the possibility of generating stresses due to
thermal shock, a preheat stage in the soldering process
is recommended, and the peak temperature of the solder
process should be rigidly controlled.
When using a reflow process, care should be taken to
ensure that the CH chip is not subjected to a thermal
gradient steeper than 4 degrees per second; the ideal
gradient being 2 degrees per second. During the soldering
process, preheating to within 100 degrees of the solder's
peak temperature is essential to minimize thermal shock.
Once the soldering process has been completed, it is
still necessary to ensure that any further thermal shocks
are avoided. One possible cause of thermal shock is hot
printed circuit boards being removed from the solder
process and subjected to cleaning solvents at room
temperature. The boards must be allowed to cool gradually
to less than 50ºC before cleaning.
250
MAXIMUM TEMPERATURE
230°C
200
250
TEMPERATURE
°C
TEMPERATURE
°C
CH series devices have silver-platinum terminals (Ag/Pt),
and the recommended solder is 62/36/2 (Sn/Pb/Ag), 60/40
(Sn/Pb) or 63/37 (Sn/Pb). Littelfuse also recommends an
RMA solder flux.
Reflow Solder Profile
40-80
SECONDS
MAXIMUM TEMPERATURE
ABOVE 183°C
230°C
150
200
RAMP RATE40-80
CH Series
Tape and Reel Specifications
Symbol
P0
E
W
P
P2
F
K0
D
SECTION
THRU
CAVITY
B0
A0
D1
PLAN VIEW OF STRIP
R2
K0
A0
Cavity Width
5.5 -/+ 0.1
K0
Cavity Depth
H0
Ref. Plane for A0 and B0
2.0 Min.
+ 0.10
0.3
- 0.05
0.5 Max.
R1, R2, R3
Tape Cavity Radii
Carrier Tape Thickness
1.0 Max.
T
T1
Cover Tape Thickness
0.1 Max.
E
Sprocket Hole from Edge
1.75 -/+ 0.1
P0
Sprocket Hole Pitch
D
Sprocket Hole Diameter
P2
Hole Centre to Component Centre
4.0 -/+ 0.1
+ 0.1
1.5
- 0.0
2.0 -/+ 0.15
K
R4
MINIMUM
BENDING
RADIUS
R3
A0
8.8 -/+ 0.1
T
CROSS SECTION
(REF. PLANE FOR A 0 & B0)
H0 B 0
Size (mm)
Cavity Length
T1
T
R1
Parameter
B0
REELED RADIUS DET AILS
CAVITY DETAILS
R4
Min. Bending Radius
D1
Ejection Hole Diameter
30.5 Min.
1.5 Min.
K
Overall Thickness
3.0 Min.
P
Pitch Of Component
8.0 -/+ 0.1
F
Sprocket Hole to Ejection Hole
7.5 -/+ 0.1
W
Carrier Tape Width
16.0 -/+ 0.3
Notes :
1. Conforms to EIA-481-1, Revision A
2. Can be supplied to IEC P ublication 286-3
Standard Packaging*
Special Packaging
CH Series varistors are always shipped in tape and reel.
The standard 13-inch reel utilized contains 4000 pieces.
Option 1
Note also that the CH Series receives no branding on the
chip itself.
Option 2
*NOTE: It is recommended that parts be kept in the sealed
bag provided and that parts be used as soon as possible
when removed from bags.
7-inch reels containing 1000 pieces are
available. To order 7-inch reels add a 'T' suffix to
the part number; e.g., V47CH8T.
For small quantities (less than 100 pieces) the
units are shipped bulk pack. To order, add a 'S'
suffix to the part number; e.g., V47CH8S.
Ordering Notes:
X3313: HIGH SURGE RATING OPTION -X3313-Passivative glass coating version: High
surge rated up to 600A and suitable to use for
water cleaning soldering paste Example:
Standard Model
Order As
V33CH8
V33CH8X3313
Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are
not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at www.littelfuse.com/disclaimer-electronics.
© 2020 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 02/20/20
