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Varistor Products
©2009 Littelfuse, Inc.
Revision: November 11, 2009
RA Varistor Series
Low Profile / Application Specific Varistors > RA Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ra.html for current information.
RA S
eries
Part
Number
Brand
Maximum Rating (125°C)
Specifications (25°C)
Continuous
Transient
Varistor Voltage at 1mA
DC Test Current
Max Clamping
Volt V
C
at 2.0A
(8/20s)
Typical
Capacitance
V
RMS
V
DC
Energy
(10/1000s)
Peak
Current
(8/20s)
V
M(AC)
V
M(DC)
W
TM
I
TM
Min
V
N(DC)
Max
V
C
I
p
f = 1MHz
(mm)
(V)
(V)
(J)
(A) (V)
(V)
(V)
(V)
(A)
(pF)
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
RA22 Series
V24RA22
24R22
14
18
(Note 3)
100.0
(Note 2)
2000
19.2
24
(Note 4)
26
43
20
18000
V36RA22
36R22
23
31
160.0
(Note 2)
2000
32
36
(Note 4)
40
63
20
12000
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
RA Series Ratings & Specifications
NOTES:
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.
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.
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 aver-
age power dissipation.
Power Dissipation Ratings
100
90
50
10
O
1
T
T
1
T
2
TIME
Peak Pulse Current Test Waveform
0
1
= Virtual Origin of Wave
T = Time from 10% to 90% of Peak
T
1
= Rise Time = 1.25 x T
T
2
= Decay Time
Example - For an 8/20 s Current Waveform:
8s = T
1
= Rise Time
20s = T
2
= Decay Time
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 (
o
C)
PERCENT OF R
A
TED
V
ALUE
Figure 1
Figure 2
Summary :
RA S eries Part Number Brand Maximum Rating (125°C) Specifications (25°C) Continuous Transient Varistor Voltage at 1mA DC Test Current Max Clamping Volt V C at 2.0A (8/20s) Typical Capacitance V RMS V DC Energy (10/1000s) Peak Current (8/20s) V M(AC) V M(DC) W TM I TM Min V N(DC) Max V C I p f = 1MHz (mm) (V) (V) (J) (A) (V) (V) (V) (V) (A) (pF) 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 RA22 Series V24RA22 24R22 14 18 (Note 3) 100.0 (Note 2) 2000 19.2 24 (Note 4) 26 43 20 18000 V36RA22 36R22 23 31 160.0 (Note 2) 2000 32 36 (Note 4) 40 63 20 12000 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 RA Series Ratings &
Tags :
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