Varistor Products
©2010 Littelfuse, Inc.
Revision: August 30, 2010
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.
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.
Features
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mount chip in 5
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VM(AC)RMS 14V to 275V
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reel or bulk pack
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125ºC ambient
Agency Approvals
Absolute Maximum Ratings
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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
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 (WTM) 1.0 to 8.0 J
Operating Ambient Temperature Range (TA) -55 to +125 ºC
Storage Temperature Range (TSTG) -55 to +150 ºC
Temperature Coefficient (DV) of Clamping Voltage (VC) at Specified Test Current <0.01 %/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.
AGENCY AGENCY FILE NUMBER
UL E320116
Recognized under the components program of
Underwriters Laboratories.
Varistor Products
©2010 Littelfuse, Inc.
Revision: August 30, 2010
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 VC at
Test Current (8/20μs) Typical
Capacitance
VRMS VDC
Energy
(10/1000μ s)
Peak Current
(8/20μs)
VM(AC) VM(DC) WTM ITM MIN VN(DC) MAX VCIPf=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 RATED VALUE
Figure 1
Varistor Products
©2010 Littelfuse, Inc.
Revision: August 30, 2010
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.
CH Series
100
90
50
10
O1T
T1
T2
TIME
PERCENT OF PEAK VALUE
Peak Pulse Current Test Waveform
Clamping Voltage for V120CH8 – V430CH8
Clamping Voltage for V22CH8 – V68CH8
500
400
300
200
100
90
80
70
60
50
40
30
20
10
MAXIMUM PEAK VOLTS (V)
PEAK AMPERES (A)
10-3 10 -2 10 -1 10010 110 2103
V56CH8
V47CH8
V39CH8
V33CH8
V27CH8
V22CH8
MAXIMUM CLAMPING VOLTAGE
MODEL SIZE 5 x 8mm
22 TO 56VN(DC) RATING
TA = -55oC TO 125oC
V68CH8
4,000
3,000
2,000
1,000
900
800
700
600
500
400
300
200
100
10-3 10 -2 10 -1 10010 110 210310 4
V180CH8
V150CH8
V120CH8
V430CH8
V390CH8
V360CH8
V240CH8
V220CH8
V200CH8
PEAK AMPERES (A)
MAXIMUM PEAK VOLTS (V)
MAXIMUM CLAMPING VOLTAGE
MODEL SIZE 5 x 8mm
100 TO 430VN(DC) RATING
TA = -55oC TO 125oC
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.
Surge Current Rating Curves for V22CH8 - V56CH8
500
200
50
20
10
5
2
1
0.2
0.5
100
20 100 1,000 10,000
IMPULSE DURATION
SURGE CURRENT (A)
1
2
10
102
103
104
105
106
INDEFINITE
MODEL SIZE 5 x 8mm
V22CH8 - V56CH8
(μs)
20 100 1,000 10,000
IMPULSE DURATION
2,000
1,000
500
200
100
50
20
10
5
2
1
1
2
10
102
103
104
105
INDEFINITE
MODEL SIZE 5 x 8mm
V120CH8 - V430CH8
106
SURGE CURRENT (A)
(μs)
Pulse Rating Curves
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
Surge Current Rating Curves for
V120CH8 - V430CH8
Figure 2
Figure 3 Figure 4
Figure 5 Figure 6
Varistor Products
©2010 Littelfuse, Inc.
Revision: August 30, 2010
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.
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.
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.
PREHEAT ZONE
PREHEAT DWELL
RAMP RATE
<2°C/s
MAXIMUM TEMPERATURE
230°C
TEMPERATURE °C
TIME (MINUTES)
250
200
150
100
50
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
40-80
SECONDS
ABOVE 183°C
TIME (MINUTES)
300
250
200
150
100
50
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
MAXIMUM WAVE 260°C
SECOND PREHEAT
FIRST PREHEAT
TEMPERATURE °C
MAXIMUM TEMPERATURE 260˚C,
TIME WITHIN 5˚C OF PEAK
20 SECONDS MAXIMUM
PREHEAT ZONE
RAMP RATE
<3˚C/s 60 - 150 SEC
> 217˚C
TEMPERATURE °C
TIME (MINUTES)
300
250
200
150
100
50
00 1.0 2.0 3.0 4.0 5.0 6.0 7.0
Reflow Solder Profile
Wave Solder Profile
Lead–free Re-flow Solder Profile
Figure 7
Figure 8
Figure 9
Varistor Products
©2010 Littelfuse, Inc.
Revision: August 30, 2010
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.
CH Series
Dimensions
NOTE 1
C
A
B
E
L
W
D
Symbol Inches Millimeters
Min Max Min Max
A0.402 10.210
B0.216 5.500
C0.087 2.210
D- 0.080 - 2.03
E0.016 0.050 0.41 1.27
L0.311 0.335 7.90 8.51
W0.185 0.207 4.70 5.26
PAD LAYOUT DIMENSIONS
CHIP LAYOUT DIMENSIONS
Part Numbering System
V 220 CH 8
RELATIVE SIZE INDICATOR
LITTELFUSE VARISTOR
SERIES DESIGNATOR
NOMINAL VARISTOR
VOLTAGE
PACKAGING OPTIONS
No Letter: Standard 13 Inch Reel
T: 7 Inch Reel
S: Bulk Pack
X
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.
Varistor Products
©2010 Littelfuse, Inc.
Revision: August 30, 2010
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.
Notes :
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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.
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.
Symbol Parameter Size (mm)
B0Cavity Length 8.5 -/+ 0.1
A0Cavity Width 5.5 -/+ 0.1
K0Cavity Depth 2.0 Min.
H0Ref. Plane for A0 and B0 + 0.10
0.3
- 0.05
R1, R2, R3Tape Cavity Radii 0.5 Max.
TCarrier Tape Thickness 1.0 Max.
T1Cover Tape Thickness 0.1 Max.
ESprocket Hole from Edge 1.75 -/+ 0.1
P0Sprocket Hole Pitch 4.0 -/+ 0.1
DSprocket Hole Diameter + 0.1
1.5
- 0.0
P2Hole Centre to Component Centre 2.0 -/+ 0.15
R4Min. Bending Radius 30.5 Min.
D1Ejection Hole Diameter 1.5 Min.
KOverall Thickness 3.0 Min.
PPitch Of Component 8.0 -/+ 0.1
FSprocket Hole to Ejection Hole 7.5 -/+ 0.1
WCarrier Tape Width 16.0 -/+ 0.3
B0
D
P2
P
P0
A0
D1
E
F
W
CROSS SECTION
(REF. PLANE FOR A0 & B0)
T
R1
R2
K0
A0
R3
B0
H0
K0
SECTION
THRU
CAVITY
T1
T
K
MINIMUM
BENDING
RADIUS
R4
CAVITY DETAILS
REELED RADIUS DETAILS
PLAN VIEW OF STRIP
Tape and Reel Specifications