Varistor Products
Low Profile / Application Specific Varistors > RA Series
RA Varistor Series
Agency Approvals
Agency Agency File Number
E320116
LR91788
RoHS
Description
The RA Series transient surge suppressors are varistors
(MOVs) supplied in a low-profile box that features a precise
seating plane to increase mechanical stability for secure
circuit-board mounting. This feature makes these devices
suitable for industrial applications critical to vibration. Their
construction permits operation up to 125ºC (ambient)
without derating.
The RA Series are available in voltage ratings up to 275V
V
, and energy levels up to 140J. These varistors are
M(AC)RMS
used in automotive, motor-control, telecommunication, and
military applications.
See RA Series Device Ratings and Specifications Table for
part number and brand information.
Features
• Lead–free/RoHS
compliant parts
available (add
suffix "x2749")
• Low profile outline with
precise seating plane
• No derating up to
125ºC ambient
• In-line leads
• Wide operating
voltage range:
V
M(AC)RMS
V
M(DC):
: 4 – 275V
5.5 – 369V
• High energy absorption
capability W
TM
up to 140J
• 3 model sizes available
A8, RA16, and RA22
Absolute Maximum Ratings
• For ratings of individual members of a series, see Device Ratings and Specifications chart
Continuous RA8 Series RA16 Series RA22 Series Units
Steady State Applied Voltage:
AC Voltage Range (V
DC Voltage Range (V
Transients:
Peak Pulse Current (ITM)
For 8/20μs Current Wave (See Figure 2) 100 to 1200 1000 to 4500 2000 to 6500 A
Single Pulse Energy Range (Note 1)
For 10/1000μs Current Wave (W
Operating Ambient Temperature Range (T
Storage Temperature Range (T
Temperature Coefficient (a
Hi-Pot Encapsulation (COATING Isolation Voltage Capability)
(Delectric must withstand indicated DC voltage for one minute per MIL-STD 202, Method 301)
COATING Insulation Resistance 1000 1000 1000 MΩ
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 -55 to +150 -55 to +150 ºC
STG
V
) of Clamping Voltage (VC) at Specified Test Current <0.01 <0.01 <0.01 %/ºC
) 4 to 275 10 to 275 4 to 275 V
M(AC)RMS
) 5.5 to 369 14 to 369 18 to 369 V
M(DC)
) 0.4 to 23 3.5 to 75 70 to 160 J
) -55 to +125 -55 to +125 -55 to +125 ºC
A
TM
5000 5000 5000 V
RA Series
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ra.html for current information.
193
Revised: May 8, 2013
RA Varistor Series
Varistor Products
Low Profile / Application Specific Varistors > RA Series
RA Series Ratings & Specifications
Maximum Rating (125°C) Specifications (25°C)
Continuous Transient
Part
Number
Brand
Energy
(10/1000μs)
WTM I
V
V
M(DC)
DC
V
RMS
V
M(AC)
Peak
Current
(8/20μs)
TM
Varistor Voltage at 1mA
DC Test Current
Min V
N(DC)
Max V
(mm) (V) (V) (J) (A) (V) (V) (V) (V) (A) (pF)
† RA8 Series
V8RA8 8R 4 5.5 0.4 150 6 8.2 11.2 22 5 3000
V12RA8 12R 6 8 0.6 150 9 12 16 34 5 2500
V18RA8 18R 10 14 0.8 250 14.4 18 21.6 42 5 2000
V22RA8 22R 14
18
(Note 3)
10
(Note 2)
250 18.7 22 26 47 5 1600
V27RA8 27R 17 22 1.0 250 23 27 31.1 57 5 1300
V33RA8 33R 20 26 1.2 250 29.5 33 36.5 68 5 1100
V39RA8 39R 25 31 1.5 250 35 39 43 79 5 900
V47RA8 47R 30 38 1.8 250 42 47 52 92 5 800
V56RA8 56R 35 45 2.3 250 50 56 62 107 5 700
V68RA8 68R 40 56 3.0 250 61 68 75 127 5 600
V82RA8 82R 50 66 4.0 1200 74 82 91 135 10 500
V100RA8 100R 60 81 5.0 1200 90 100 110 165 10 400
V120RA8 120R 75 102 6.0 1200 108 120 132 205 10 300
V150RA8 150R 95 127 8.0 1200 135 150 165 250 10 250
V180RA8 180R 115 153 10.0 1200 162 180 198 295 10 200
V200RA8 200R 130 175 11.0 1200 184 200 228 340 10 180
† V220RA8 220R 140 180 12.0 1200 198 220 242 360 10 160
† V240RA8 240R 150 200 13.0 1200 212 240 268 395 10 150
† V270RA8 270R 175 225 15.0 1200 247 270 303 455 10 130
† V360RA8 360R 230 300 20.0 1200 324 360 396 595 10 100
† V390RA8 390R 250 330 21.0 1200 354 390 429 650 10 90
† V430RA8 430R 275 369 23.0 1200 389 430 473 710 10 80
Max Clamping
Volt V
at 2.0A
C
(8/20μs)
C
I
p
Typical
Capacitance
f = 1MHz
† RA16 Series
V18RA16 18R16 10 14 3.5 1000 14.4 18 21.6 39 10 11000
V22RA16 22R16 14 18 (Note 3) 50 (Note 2) 1000 18.7 22 26 43 10 9000
V27RA16 27R16 17 22 5.0 1000 23 27 31.1 53 10 7000
V33RA16 33R16 20 26 6.0 1000 29.5 33 36.5 64 10 6000
V39RA16 39R16 25 31 7.2 1000 35 39 43 76 10 5000
V47RA16 47R16 30 38 8.8 1000 42 47 52 89 10 4500
V56RA16 56R16 35 45 10.0 1000 50 56 62 103 10 3900
V68RA16 68R16 40 56 13.0 1000 61 68 75 123 10 3300
V82RA16 82R16 50 66 15.0 4500 74 82 91 145 50 2500
V100RA16 100R16 60 81 20.0 4500 90 100 110 175 50 2000
V120RA16 120R16 75 102 22.0 4500 108 120 132 205 50 1700
V150RA16 150R16 95 127 30.0 4500 135 150 165 255 50 1400
V180RA16 180R16 115 153 35.0 4500 162 180 198 300 50 1100
V200RA16 200R16 130 175 38.0 4500 184 200 228 340 50 1000
† V220RA16 220R16 140 180 42.0 4500 198 220 242 360 50 900
† V240RA16 240R16 150 200 45.0 4500 212 240 268 395 50 800
† V270RA16 270R16 175 225 55.0 4500 247 270 303 455 50 700
† V360RA16 360R16 230 300 70.0 4500 324 360 396 595 50 550
† V390RA16 390R16 250 330 72.0 4500 354 390 429 650 50 500
† V430RA16 430R16 275 369 75.0 4500 389 430 473 710 50 450
RA Varistor Series
194
Revised: May 8, 2013
Please refer to www.littelfuse.com/series/ra.html for current information.
Specifications are subject to change without notice.
© 2013 Littelfuse, Inc.
Varistor Products
Low Profile / Application Specific Varistors > RA Series
RA Series Ratings & Specifications
Maximum Rating (125°C) Specifications (25°C)
Continuous Transient
Part
Number
Brand
V
RMS
V
M(AC)
V
DC
V
M(DC)
Energy
(10/1000μs)
WTM I
Peak
Current
(8/20μs)
TM
Varistor Voltage at 1mA
DC Test Current
Min V
N(DC)
Max V
(mm) (V) (V) (J) (A) (V) (V) (V) (V) (A) (pF)
† RA22 Series
V24RA22 24R22 14
18
(Note 3)
V36RA22 36R22 23 31
100.0
(Note 2)
160.0
(Note 2)
2000 19.2
2000 32
24
(Note 4)
36
(Note 4)
† V200RA22 200R22 130 175 70.0 6500 184 200 228 340 100 1900
† V240RA22 240R22 150 200 80.0 6500 212 240 268 395 100 1600
† V270RA22 270R22 175 225 90.0 6500 247 270 303 455 100 1400
† V390RA22 390R22 250 330 130.0 6500 354 390 429 650 100 1000
† V430RA22 430R22 275 369 140.0 6500 389 430 473 710 100 900
1. Average power dissipation of transients not to exceed 0.25W for RA8 Series, 0.60W for RA16 Series, or 1.0W for RA22 Series.
NOTES:
2. Energy ratings for impulse duration of 30ms minimum to one half of peak current value.
3. Also rated to withstand 24V for 5 minutes.
4. 10mA DC Test Current.
† Under UL File No. E320116 as a recognized component. CSA approved File No. LR91788.
Max Clamping
Volt V
at 2.0A
C
(8/20μs)
C
I
p
Typical
Capacitance
f = 1MHz
26 43 20 18000
40 63 20 12000
Power Dissipation Ratings
100
90
80
70
60
50
40
30
20
PERCENT OF RATED VALUE
10
0
Figure 1
-55 50 60 70 80 90 10 0 110 120 130 140 150
AMBIENT TEMPERATURE (
Should transients occur in rapid succession, 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 temperatures as
shown above. 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.
o
C)
Peak Pulse Current Test Waveform
100
90
50
10
1
Figure 2
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:
T
T
1
T
2
8μs = T1 = Rise Time
20μs = T2 = Decay Time
TIME
RA Series
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ra.html for current information.
195
Revised: May 8, 2013
RA Varistor Series
Varistor Products
)
4,000
0
Low Profile / Application Specific Varistors > RA Series
Maximum Clamping Voltage for 8mm Parts
V8RA8 - V68RA8
600
MAXIMUM CLAMPING VOLTAGE
500
400
300
200
100
MAXIMUM PEAK VOLTS (V)
Figure 3
V82RA8 - V430RA8
3,000
2,000
1,000
900
800
700
600
500
400
300
200
100
Figure 4
10
68V
8 T
T
= -55oC TO 125oC
A
90
V68RA8
80
V56RA8
70
60
V47RA8
50
V39RA8
V33RA8
40
V27RA8
30
V22RA8
V18RA8
20
V12RA8
V8RA8
10
-3
10
MAXIMUM CLAMPING VOLTAGE
MODEL SIZE 5 x 8mm
82 TO 430V
T
= -55oC TO 125oC
A
V360RA8
V270RA8
V180RA8
V150RA8
V120RA8
V100RA8
-3
RATING
O
N(DC)
-1
10-210
PEAK AMPERES (A)
RATING
N(DC)
V430RA8
V390RA8
-210-1100101
10
PEAK AMPERES (A
10010110210
V240RA8
V220RA8
V200RA8
V82RA8
10210
Repetitive Surge Capability for 8mm Parts
V8RA8 - V12RA8
200
1
100
10
50
2
10
20
3
10
10
4
2
10
5
10
10
5
2
SURGE CURRENT (A)
1
INDEFINITE
0.5
0.2
3
Figure 5
20 100 1,000 10,000
IMPULSE DURATION
V18RA8 - V68RA8
500
1
200
100
10
2
10
50
3
10
20
2
10
5
SURGE CURRENT (A)
2
INDEFINITE
1
0.5
3
1
Figure 6
0.2
20 100 1,000 10,000
IMPULSE DURATION (μs)
4
10
10
6
5
6
10
V8RA8 - V12RA8
(μs)
V18RA8 - V68RA8
RA Varistor Series
V82RA8 - V430RA8
2,000
1
1,000
2
500
10
200
2
10
100
50
20
10
SURGE CURRENT (A)
INDEFINITE
5
2
1
20 100 1,000 10,000
Figure 7
196
Revised: May 8, 2013
IMPULSE DURATION (μs)
Please refer to www.littelfuse.com/series/ra.html for current information.
Specifications are subject to change without notice.
V82RA8 - V430RA8
3
10
4
10
5
10
6
10
© 2013 Littelfuse, Inc.
Varistor Products
Low Profile / Application Specific Varistors > RA Series
Maximum Clamping Voltage for 16mm Parts
V18RA16 - V68RA16
600
MAXIMUM CLAMPING VOLTAGE
500
18 TO 68V
400
T
= -55oC TO 125oC
A
300
200
100
90
V68RA16
80
V56RA16
70
60
V47RA16
50
V39RA16
V33RA16
40
MAXIMUM PEAK VOLTS (V)
V27RA16
30
V22RA16
V18RA16
20
-3
10
Figure 8
V82RA16 - V430RA16
4,000
MAXIMUM CLAMPING VOLTAGE
MODEL SIZE 5 x 8mm
3,000
82 TO 430V
T
A
2,000
1,000
900
800
700
600
500
V360RA16
400
V270RA16
300
MAXIMUM PEAK VOLTS (V)
V180RA16
200
V150RA16
V120RA16
V100RA16
100
-3
10
Figure 9
= -55oC TO 125oC
RATING
N(DC)
-2
-1
10
10
PEAK AMPERES (A)
RATING
N(DC)
V430RA16
V390RA16
-2
10-110010110210
10
0
10
PEAK AMPERES (A)
10
V240RA16
V220RA8
V200RA8
V82RA16
1
Repetitive Surge Capability for 16mm Parts
V18RA16 - V68RA16
1,000
500
200
100
SURGE CURRENT (A)
2
10
3
10
Figure 10
V82RA16 - V430RA16
5,000
2,000
1,000
SURGE CURRENT (A)
3
4
10
Figure 11
1
2
10
2
10
50
20
10
INDEFINITE
5
2
1
20 100 1,000 10,000
1
2
10
500
200
100
50
20
INDEFINITE
10
5
2
20 100 1,000 10,000
10
IMPULSE DURATION
IMPULSE DURATION
3
4
10
5
10
6
10
(μs)
V82RA16 - V430RA16
2
10
3
10
4
10
10
(μs)
V18RA16 - V68RA16
5
6
10
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ra.html for current information.
197
Revised: May 8, 2013
RA Series
RA Varistor Series
Varistor Products
10,000
2,000
200
100
50
20
10
5
2
500
20 100 1,000 10,000
IMPULSE DURATION
SURGE CURRENT (A)
5,000
1
(μs)
Low Profile / Application Specific Varistors > RA Series
Maximum Clamping Voltage for 22mm Parts
V24RA22 - V36RA22
300
MAXIMUM CLAMPING VOLTAGE
24 TO 36V
200
T
= -55oC TO 125oC
A
100
90
80
70
60
50
40
MAXIMUM PEAK VOLTS (V)
30
20
-3
10
Figure 12
V200RA22 - V430RA22
4,000
MAXIMUM CLAMPING VOLTAGE
3,000
200 TO 430V
T
= -55oC TO 125oC
A
2,000
1,000
900
800
700
600
500
400
300
MAXIMUM PEAK VOLTS (V)
200
100
-3
10
Figure 13
RATING
N(DC)
V36RA22
V24RA22
-2
10-110010110210
10
10
PEAK AMPERES (A)
RATING
N(DC)
V430RA22
V390RA22
V270RA22
V240RA22
V200RA22
-2
10-110010110210
PEAK AMPERES (A)
Repetitive Surge Capability for 22mm Parts
V24RA22 - V36RA22
2,000
1,000
500
200
100
SURGE CURRENT (A)
3
4
10
Figure 14
V200RA22 - V430RA22
1,000
3
4
10
Figure 15
1
2
10
2
10
3
10
4
10
5
10
50
20
10
INDEFINITE
5
2
20 100 1,000 10,000
1
INDEFINITE
IMPULSE DURATION
2
10
V24RA22 - V36RA22
10
(μs)
V200RA22 - V430RA22
2
10
3
10
4
10
5
10
6
10
6
NOTE: If pulse ratings are exceeded, a shift of
±10% could result. This type of shift, which normally results in a decrease of
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.
RA Varistor Series
V
(at specified current) of more than
N(DC)
V
N(DC)
, may
198
Revised: May 8, 2013
Please refer to www.littelfuse.com/series/ra.html for current information.
Specifications are subject to change without notice.
© 2013 Littelfuse, Inc.
Varistor Products
TEMPERATURE
(
C)
TEMPERATURE
(ºC)
Low Profile / Application Specific Varistors > RA Series
Wave Solder Profile
Reflow Condition Pb – Free assembly
- Temperature Min (Ts(min)) 150°C
Pre Heat
- Temperature Max (Ts(max)) 200°C
- Time (min to max) (ts) 60 – 180 secs
Average ramp–up rate (Liquidus Temp (TL)
to peak
5°C/second max
TS(max) to TL - Ramp-up Rate 5°C/second max
Reflow
- Temperature (TL) (Liquidus) 217°C
- Temperature (tL) 60 – 150 seconds
Peak Temperature (TP) 250+0/-5°C
Time within 5°C of actual peak
Temperature (tp)
20 – 40 seconds
Ramp-down Rate 5°C/second max
Time 25°C to peak Temperature (TP) 8 minutes Max.
Do not exceed 260°C
Lead–free Profile
300
250
200
150
100
50
0
00.5 11.522.533.54
Figure 16
Non Lead–free Profile
300
250
º
200
150
100
Maximum Wave 260C
TIME(MINUTES)
Maximum Wave 240C
Environmental Specifications
Operating/Storage
Temperature
Humidity Aging
Thermal Shock
Solvent Resistance MIL–STD–202, Method 215F
Moisture Sensitivity Level 1, J–STD–020C
-55°C to +125°C / -55°C to +150°C
+85°C, 85% RH, 1000 hours
+/-10% Voltage
+85°C to -40°C 10 times
+/-10% Voltage
50
0
00.5 11.5 22.5 33.5 4
Figure 17
TIME(MINUTES)
Physical Specifications
Lead Material Tin–Coated Copper
Soldering
Characteristics
Insulating Material
Device Labeling
Solderability per MIL–STD–202,
Method 208E
Cured, flame retardant epoxy polymer
meets UL94V–0 requirements.
Marked with LF, voltage, amperage rating,
and date code.
RA Series
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ra.html for current information.
199
Revised: May 8, 2013
RA Varistor Series
Product Dimensions (mm)
Varistor Products
Low Profile / Application Specific Varistors > RA Series
n
MIN
Øb
0.05
( 0.002)
E
MAX
Y
X
D MAX
e
1.0
( 0.039)
SEATING
PLANE
(0.197 MIN)
Z MIN
A MAX
5.0 MIN
0.5 MAX
OFFSET
(0.020 MAX)
SYMBOL
A (max.)
D (max.)
e
E (max.)
n (max.)
Øb
Weight
(typical)
X
RA8
Series
8.85
(0.348)
11.45
(0.450)
5
(0.197)
5.2
(0.205)
0.7
(0.027)
0.635
(0.025)
1 Gram 3.4 Grams 4.4 Grams
2.2
(0.087)
3.1 -/+ 0.5
Y
(0.122 -/+
0.02)
Z (min.)
NOTES: Dimensions are in mm, with dimensions in inches in parentheses.
Inches for reference only.
0.4
(0.015)
RA16
Series
15.1
(0.594)
19.7
(0.776)
7. 5
(0.295)
6.3
(0.248)
0.7
(0.027)
0.81
(0.032)
2.2
(0.087)
6 -/+ 1
(0.236 -/+
0.04)
0.8
(0.031)
(0.35 -/+ 0.04)
RA22
Series
19.1
(0.752)
25.5
(1.004)
7. 5
(0.295)
6.3
(0.248)
0.7
(0.027)
0.81
(0.032)
4.4
(0.173)
8.9 -/+ 1
0.8
(0.031)
Part Numbering System
The RA Series is supplied in bulk pack.
V 200 RA 16
Littelfuse
Varistor
Nominal
Varistor Voltage
X2749
OPTIONAL SUFFIX:
X2749: Lead-Free and
RoHS Compliant Option
Device Size
Series Designator
RA Varistor Series
200
Revised: May 8, 2013
Please refer to www.littelfuse.com/series/ra.html for current information.
Specifications are subject to change without notice.
© 2013 Littelfuse, Inc.
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