Varistor Products
Surface Mount Varistors > CH Series
CH Varistor Series
Agency Approvals
Recognized under the components program of
Underwriters Laboratories.
AGENCY AGENCY FILE NUMBER
UL E320116
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 (V
), and energy ratings up to 8J.
M(AC)RMS
See the Littelfuse Multilayer Suppressor Series also.
Features
• Lead–free
• Leadless, surface
mount chip in 5
x 8mm Size
• Supplied in tape and
reel or bulk pack
• No derating up to
125ºC ambient
• Voltage ratings
M(AC)RMS
14V to 275V
V
CH Series
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 (V
DC Voltage Range (V
Transient:
Peak Pulse Current (ITM)
For 8/20μs Current (See Figure 2) 100 to 250 A
Single Pulse Energy Range
For 10/1000μs Current Wave (W
Operating Ambient Temperature Range (T
Storage Temperature Range (T
Temperature Coefficient (DV) of Clamping Voltage (V
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.
) -55 to +150 ºC
STG
) 14 to 275 V
M(AC)RMS
) 18 to 369 V
M(DC)
) 1.0 to 8.0 J
) -55 to +125 ºC
A
TM
) at Specified Test Current
C
<0.01 %/ºC
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/CH.html for current information.
69
Revised: May 8, 2013
CH Varistor Series
Varistor Products
Surface Mount Varistors > CH Series
Device Ratings and Specifications
Maximum Ratings (125ºC) Specifications (25ºC)
Varistor Voltage at 1 mA DC
Test Current
MIN V
N(DC)
Part
Number
Continuous Transient
V
RMS
V
M(AC)
V
V
M(DC)
DC
Energy
(10/1000μ s)
W
TM
Peak Current
(8/20μs)
I
TM
(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
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
Max Clamping Volt V
Test Current (8/20μs)
MAX V
at
C
Capacitance
C
I
P
f=1MHz
Typical
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.
CH Varistor Series
Figure 1
70
Revised: May 8, 2013
100
90
80
70
60
50
40
30
20
PERCENT OF RATED VALUE
10
0
-55 50 60 70 80 90 100 110 120 130 140 150
AMBIENT TEMPERATURE (
Please refer to www.littelfuse.com/series/CH.html for current information.
Specifications are subject to change without notice.
o
C)
© 2013 Littelfuse, Inc.
Varistor Products
Surface Mount Varistors > CH Series
Peak Pulse Current Test Waveform
100
90
50
PERCENT OF PEAK VALUE
10
Figure 2
O
1
T
T
1
T
2
TIME
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
CH Series
Clamping Voltage for V22CH8 – V68CH8
500
400
MAXIMUM CLAMPING VOLTAGE
MODEL SIZE 5 x 8mm
300
22 TO 56V
200
= -55oC TO 125oC
T
A
100
90
V68CH8
80
V56CH8
70
V47CH8
60
V39CH8
50
V33CH8
40
V27CH8
30
V22CH8
MAXIMUM PEAK VOLTS (V)
20
10
-3
10
Figure 3 Figure 4
RATING
N(DC)
10-210
-1
0
10
PEAK AMPERES (A)
1
10
10210
3
Clamping Voltage for V120CH8 – V430CH8
Pulse Rating Curves
Surge Current Rating Curves for V22CH8 - V56CH8
500
1
200
2
10
100
2
10
50
3
10
20
10
5
INDEFINITE
2
SURGE CURRENT (A)
1
0.5
0.2
Figure 5 Figure 6
20 100 1,000 10,00 0
IMPULSE DURATION
MODEL SIZE 5 x 8mm
V22CH8 - V56CH8
4
10
5
10
6
10
(μs)
Surge Current Rating Curves for
4,000
MAXIMUM CLAMPING VOLTAGE
3,000
MODEL SIZE 5 x 8mm
100 TO 430V
= -55oC TO 125oC
T
2,000
A
1,000
900
800
700
600
500
400
300
MAXIMUM PEAK VOLTS (V)
V180CH8
200
V150CH8
V120CH8
100
-310-210-1100
10
N(DC)
V240CH8
V220CH8
V200CH8
RATING
V430CH8
V390CH8
V360CH8
PEAK AMPERES (A)
10
1
2
10
V120CH8 - V430CH8
2,000
1,000
1
500
2
200
10
100
50
20
6
10
10
SURGE CURRENT (A)
5
INDEFINITE
2
1
20 100 1,00 0 10,00 0
IMPULSE DURATION
MODEL SIZE 5 x 8mm
V120CH8 - V430CH8
2
10
3
10
4
10
5
10
(μs)
10310
4
NOTE: If pulse ratings are exceeded, a shift of V
the device not meeting the original published specifications, but it does not prevent the device from continuing to function, and to provide ample protection.
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/CH.html for current information.
(at specified current) of more than +/-10% could result. This type of shift, which normally results in a decrease of V
N(DC)
71
Revised: May 8, 2013
, may result in
N(DC)
CH Varistor Series
Varistor Products
Surface Mount Varistors > CH Series
Lead (Pb) Soldering Recommendations
The principal techniques used for the soldering of
components in surface mount technology are IR Re-flow
and Wave soldering. Typical profiles are shown on the right.
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.
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.
Reflow Solder Profile
250
200
150
100
TEMPERATURE °C
50
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
PREHEAT DWELL
PREHEAT ZONE
Figure 7
Wave Solder Profile
300
250
200
150
100
TEMPERATURE °C
50
MAXIMUM TEMPERATURE
230°C
RAMP RATE
<2°C/s
MAXIMUM WAVE 260°C
SECOND PREHEAT
FIRST PREHEAT
40-80
SECONDS
ABOVE 183°C
Lead–free (Pb-free) Soldering Recommendations
CH series devices have silver-platinum terminals (Ag/Pt),
and the recommended Lead-free solder is 96.5/3.0/0.5
(SnAgCu) with an RMA flux, though there is a wide
selection of pastes and fluxes available that should be
compatible.
The reflow profile must be constrained by the maximums
in the Lead–free Reflow Profile. For Lead–free Wave
soldering, the Wave Solder Profile still applies.
Note: the Lead–free paste, flux and profile were used for
evaluation purposes by Littelfuse, based upon industry
standards and practices. There are multiple choices of all
three available, it is advised that the customer explores the
optimum combination for their process as processes vary
considerably from site to site.
CH Varistor Series
Figure 8
Lead–free Re-flow Solder Profile
Figure 9
72
Revised: May 8, 2013
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
300
250
200
150
100
TEMPERATURE °C
MAXIMUM TEMPERATURE 260˚C,
TIME WITHIN 5˚C OF PEAK
20 SECONDS MAXIMUM
PREHEAT ZONE
50
0
0 1.0 2.0 3.0 4.0 5.0 6.0 7.0
Please refer to www.littelfuse.com/series/CH.html for current information.
TIME (MINUTES)
RAMP RATE
<3˚C/s
TIME (MINUTES)
Specifications are subject to change without notice.
60 - 150 SEC
> 217˚C
© 2013 Littelfuse, Inc.
Varistor Products
Surface Mount Varistors > CH Series
Part Numbering System
LITTELFUSE VARISTOR
NOMINAL VARISTOR
VO LTAGE
SERIES DESIGNATOR
Dimensions
PAD LAYOUT DIMENSIONS
CHIP LAYOUT DIMENSIONS
V 220 CH 8
NOTE 1
A
X
PACKAGING OPTIONS
No Letter: Standard 13 Inch Reel
T: 7 Inch Reel
S: Bulk Pack
RELATIVE SIZE INDICATOR
C
B
Symbol
Inches Millimeters
Min Max Min Max
A 0.402 10.210
B 0.216 5.500
C 0.087 2.210
D - 0.080 -
E 0.016 0.050 0.41
L 0.311 0.335 7.90
W 0.185 0.207 4.70
NOTE: Avoid metal runs in this area. Soldering recommendations: Material - 62/36/2 Sn/Pb/
Ag or equivalent.Temperature – 230ºC Max., 5s. Max. Flux - R.M.A.
2.03
1.27
8.51
5.26
CH Series
E
D
W
L
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/CH.html for current information.
73
Revised: May 8, 2013
CH Varistor Series
Tape and Reel Specifications
Varistor Products
Surface Mount Varistors > CH Series
E
F
W
PLAN VIEW OF STRIP
T
CROSS SECTION
(REF. PLANE FOR A
R
1
R
2
K
0
CAVITY DETAILS
K
P
0
P
A
0
D
P
2
B
0
D
1
0
SECTION
THRU
CAVITY
B
A
K
H
Cavity Length 8.5 -/+ 0.1
0
Cavity Width 5.5 -/+ 0.1
0
Cavity Depth 2.0 Min.
0
Ref. Plane for A0 and B0 + 0.10
0
0.3
- 0.05
T
1
T
K
R1, R2, R3Tape Cavity Radii 0.5 Max.
T Carrier Tape Thickness 1.0 Max.
T
Cover Tape Thickness 0.1 Max.
1
E Sprocket Hole from Edge 1.75 -/+ 0.1
Symbol Parameter Size (mm)
& B0)
0
B0H
0
R
3
A
0
REELED RADIUS DETAILS
R
4
MINIMUM
BENDING
RADIUS
P
D Sprocket Hole Diameter
P
R
D
Sprocket Hole Pitch 4.0 -/+ 0.1
0
Hole Centre to Component Centre 2.0 -/+ 0.15
2
Min. Bending Radius 30.5 Min.
4
Ejection Hole Diameter 1.5 Min.
1
+ 0.1
1.5
- 0.0
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 :
• Conforms to EIA-481-1, Revision A
• Can be supplied to IEC P ublication 286-3
Standard Packaging*
CH Series varistors are always shipped in tape and reel.
The standard 13-inch reel utilized contains 4000 pieces.
Note also that the CH Series receives no branding on the
chip itself.
*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.
CH Varistor Series
Revised: May 8, 2013
Special Packaging
Option 1 7-inch reels containing 1000 pieces are
available. To order 7-inch reels add a 'T' suffix to
the part number; e.g., V47CH8T.
Option 2 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.
74
Please refer to www.littelfuse.com/series/CH.html for current information.
Specifications are subject to change without notice.
© 2013 Littelfuse, Inc.
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