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Jameco Part Number 1763587
Varistor Products
Surface Mount Varistors > CH Series
RoHS
CH Varistor Series
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 23J.
See the Littelfuse Multilayer Suppressor Series also.
Agency Approvals
Recognized under the components program of
Underwriters Laboratories.
Features
t -FBE'SFF
AGENCY
AGENCY FILE NUMBER
t -FBEMFTT4VSGBDF
Mount Chip in
5 x 8mm Size
UL E75961/E135010
t 4VQQMJFEJO5BQFBOE
Reel or Bulk Pack
t /P%FSBUJOHVQUP
125ºC Ambient
t 7PMUBHF3BUJOHT
VM(AC)RMS 14V to 275V
Absolute Maximum Ratings
t'PSSBUJOHTPGJOEJWJEVBMNFNCFSTPGBTFSJFTTFF%FWJDF3BUJOHTBOE4QFDJmDBUJPOTDIBSU
Continuous
Steady State Applied Voltage:
AC Voltage Range (VM(AC)RMS)
DC Voltage Range (VM(DC))
CH Series
Units
14 to 275
18 to 369
V
V
UP
A
UP
-55 to + 125
UP
J
C
O
C
OC
Transient:
Peak Pulse Current (ITM)
'PS˜T$VSSFOU4FF'JHVSF
Single Pulse Energy Range
'PS˜T$VSSFOU8BWF8TM)
Operating Ambient Temperature Range (TA)
Storage Temperature Range (TSTG)
Temperature Coefficient (αV) of Clamping Voltage (VC) at Specified Test Current
O
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.
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/CH.html for current information.
169
Revision: April 29, 2008
CH Varistor Series
Varistor Products
Surface Mount Varistors > CH Series
Device Ratings and Specifications
Maximum Ratings (125ºC)
Continuous
Part
Number
Specifications (25ºC)
Varistor Voltage at 1 mA Dc Max Clamping Volt VC at
Test Current (8/20μs)
Test Current
Transient
Typical
Capacitance
VRMS
VDC
VM(AC)
VM(DC)
Energy
(10/1000μs)
WTM
Peak Current
(8/20μs)
ITM
(V)
(V)
(J)
MIN
V/%$
MAX
VC
IP
f=1MHz
(A)
(V)
(V)
(V)
(V)
(A)
(pF)
V22CH8
14
/PUF
/PUF
18.7
47
5
V27CH8
17
22
31.1
57
5
V33CH8
26
29.5
36.5
68
5
V39CH8
25
31
79
5
V47CH8
38
1.2
92
5
V56CH8
35
45
1.4
5
V68CH8
56
1.5
127
7$)
75
† 7$)
95
127
† 7$)
115
153
295
† 7$)
175
† 7$)
† 7$)
395
† 7$)
595
† 7$)
† 7$)
275
369
/05&4
1PXFSEJTTJQBUJPOPGUSBOTJFOUTOPUUPFYDFFE8
&OFSHZSBUJOHGPSJNQVMTFEVSBUJPOPGNTNJOJNVNUPPOFIBMGPGQFBLDVSSFOUWBMVF
3. Also rated to withstand 24V for 5 minutes.
p77$)7BSJTUPSTBSFSFDPHOJ[FEVOEFS6-mMF&BTBSFDPHOJ[FEDPNQPOFOU
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
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the operating values need to be derated at high tempera
UVSFTBTTIPXOJO'JHVSF#FDBVTFWBSJTUPSTDBOPOMZ
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
PERCENT OF RATED VALUE
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)
170
Revision: April 29, 2008
©2008 Littelfuse, Inc.
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
PERCENT OF PEAK VALUE
Peak Pulse Current Test Waveform
100
17JSUVBM0SJHJOPG8BWF
55JNFGSPNUPPG1FBL
T17JSUVBM'SPOU5JNFYU
T2 = Virtual Time to Half Value (Impulse Duration)
90
50
Example 'PSBOçT$VSSFOU8BWFGPSN
8 s = T17JSUVBM'SPOU5JNF
T52 = Virtual Time to Half Value
10
O1
T
TIME
T1
T2
Clamping Voltage for V22CH8 – V68CH8
4,000
MAXIMUM CLAMPING VOLTAGE
MODEL SIZE 5 x 8mm
22 TO 56VN(DC) RATING
TA = -55oC TO 125 oC
200
100
90
80
70
60
50
40
V68CH8
V56CH8
V47CH8
V39CH8
V33CH8
V27CH8
V22CH8
30
20
10
10 -3
10 -2
10 -1
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)
MAXIMUM PEAK VOLTS (V)
500
400
300
Clamping Voltage for V120CH8 – V430CH8
10 1
10 2
2,000
1,000
900
800
700
600
500
400
V240CH8
V220CH8
V200CH8
300
200 V180CH8
V150CH8
V120CH8
100
10 -3
10 3
V430CH8
V390CH8
V360CH8
10 -2
10 -1
PEAK AMPERES (A)
10 0
10 1
10 2
PEAK AMPERES (A)
10 3
10 4
Pulse Rating Curves
Surge Current Rating Curves For
V120CH8 - V430CH8
Surge Current Rating Curves for V22CH8 - V56CH8
1
200
2
100
10
50
10 2
20
2,000
MODEL SIZE 5 x 8mm
V22CH8 - V56CH8
10
5
2
1
500
10 4
10 5
10 6
10 3
MODEL SIZE 5 x 8mm
V120CH8 - V430CH8
1,000
SURGE CURRENT (A)
SURGE CURRENT (A)
500
INDEFINITE
1
10
100
50
20
10
10 6
5
INDEFINITE
0.5
0.2
20
10 2
10 3
10 4
10 5
2
200
2
100
1,000
IMPULSE DURATION (μs)
1
10,000
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 published specifications, but it does not prevent the device from continuing to function, and to provide ample protection.
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/CH.html for current information.
171
Revision: April 29, 2008
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 &
8BWFTPMEFSJOH5ZQJDBMQSPmMFTBSFTIPXOPOUIFSJHIU
Reflow Solder Profile
250
The recommended solder for the CH suppressor is
B4O1C"H
4O1C
PS4O1C
Littelfuse also recommends an RMA solder flux.
MAXIMUM TEMPERATURE
230°C
TEMPERATURE °C
200
8BWFTPMEFSJOHJTUIFNPTUTUSFOVPVTPGUIFQSPDFTTFT
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.
40-80
SECONDS
ABOVE 183°C
150
RAMP RATE
<2°C/s
100
PREHEAT DWELL
50
0
8IFOVTJOHBSFnPXQSPDFTTDBSFTIPVMECFUBLFOUP
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
QSPDFTTQSFIFBUJOHUPXJUIJOEFHSFFTPGUIFTPMEFSÓT
peak temperature is essential to minimize thermal shock.
PREHEAT ZONE
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
TIME (MINUTES)
Wave Solder Profile
300
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
UPMFTTUIBO„$CFGPSFDMFBOJOH
MAXIMUM WAVE 260°C
TEMPERATURE °C
250
200
150
SECOND PREHEAT
100
FIRST PREHEAT
50
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
TIME (MINUTES)
3.5
4.0
4.5
Lead-free (Pb-free) Soldering Recommendations
5IFQSFGFSSFETPMEFSJT4O"H$V
XJUIBO
RMA flux, but there is a wide selection of pastes &
fluxes available with which the nickel barrier parts should
be compatible.
Lead-free Re-flow Solder Profile
300
MAXIMUM TEMPERATURE 250˚C,
TIME WITHIN 5˚C OF PEAK
20 SECONDS MAXIMUM
250
TEMPERATURE °C
The reflow profile must be constrained by the maximums
JOUIF-FBEGSFF3FnPX1SPmMF'PS1CGSFF8BWFTPMEFSJOH
UIF8BWF4PMEFS1SPmMFTUJMMBQQMJFT
/PUFUIF1CGSFFQBTUFnVYQSPmMFXFSFVTFEGPS
evaluation purposes by Littelfuse, based upon industry
standards & 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.
RAMP RATE
<3˚C/s
200
60 - 150 SEC
> 217˚C
150
100
PREHEAT ZONE
50
0
0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
TIME (MINUTES)
CH Varistor Series
172
Revision: April 29, 2008
©2008 Littelfuse, Inc.
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
Part Numbering System
V
220
CH
8
X
LITTELFUSE VARISTOR TECHNOLOGY
PACKAGING OPTIONS
No Letter: Standard 13 Inch Reel
T: 7 Inch Reel
S: Bulk Pack
NOMINAL VARISTOR VOLTAGE
SERIES DESIGNATOR
RELATIVE SIZE INDICATOR
Dimensions
1"%-":065%&.&/4*0/4
C
NOTE 1
Symbol
B
Inches
Min
Max
B
C
$)*1-":065%*.&/4*0/4
Min
A
D
A
Millimeters
Max
-
-
E
œ
L
œ
8
œ
/05&"WPJENFUBMSVOTJOUIJTBSFB4PMEFSJOHSFDPNNFOEBUJPOT.BUFSJBM4O1C
"HPSFRVJWBMFOU5FNQFSBUVSFo$.BYT.BY'MVY3."
E
L
D
W
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/CH.html for current information.
173
Revision: April 29, 2008
CH Varistor Series
Varistor Products
Surface Mount Varistors > 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
CROSS SECTION
(REF. PLANE FOR A 0 & B0)
H0 B0
R1
R2
K0
R3
A0
B
Cavity Length
œ
$BWJUZ8JEUI
œ
K
Cavity Depth
.JO
H
3FG1MBOFGPS"BOE#
R1, R2, R3
T
T
T
R4
CAVITY DETAILS
Tape Cavity Radii
.BY
Carrier Tape Thickness
.BY
T1
Cover Tape Thickness
.BY
E
Sprocket Hole from Edge
œ
P
Sprocket Hole Pitch
D
Sprocket Hole Diameter
P2
Hole Centre to Component Centre
œ
R4
Min. Bending Radius
.JO
MINIMUM
BENDING
RADIUS
REELED RADIUS DETAILS
Size (mm)
A
T1
K
Parameter
œ
1.5
D1
Ejection Hole Diameter
1.5 Min.
K
Overall Thickness
.JO
P
Pitch Of Component
œ
'
Sprocket Hole to Ejection Hole
œ
8
$BSSJFS5BQF8JEUI
œ
/PUFT
t$POGPSNTUP&*"3FWJTJPO"
t$BOCFTVQQMJFEUP*&$QVCMJDBUJPO
Standard Packaging
Special Packaging
CH Series varistors are always shipped in tape and reel.The
TUBOEBSEJOSFFMVUJMJ[FEDPOUBJOTQJFDFT
Option 1JODISFFMTDPOUBJOJOHQJFDFTBSFBWBJMBCMF
To order 7in reels add a T suffix to the part
number; e.g., V47CH8T.
Option 2'PSTNBMMRVBOUJUJFTMFTTUIBOQJFDFT
UIF
units are shipped bulk pack. To order, add a S
suffix to the part number; e.g., V47CH8S.
/PUFBMTPUIBUUIF$)4FSJFTSFDFJWFTOPCSBOEJOHPOUIF
chip itself.
CH Varistor Series
174
Revision: April 29, 2008
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/CH.html for current information.