Littelfuse RA Varistor Series - Manual

© 2013 Littelfuse, Inc. 193
Revised: May 8, 2013
Varistor Products
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 Series
RA Varistor Series
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
M(AC)RMS
, and energy levels up to 140J. These varistors are
used in automotive, motor-control, telecommunication, and
military applications.
See RA Series Device Ratings and Specifications Table for
part number and brand information.
Features
Agency Approvals
Absolute Maximum Ratings
• For ratings of individual members of a series, see Device Ratings and Specifications chart
Agency Agency File Number
E320116
LR91788
Continuous RA8 Series RA16 Series RA22 Series Units
Steady State Applied Voltage:
AC Voltage Range (V
M(AC)RMS
) 4 to 275 10 to 275 4 to 275 V
DC Voltage Range (V
M(DC)
) 5.5 to 369 14 to 369 18 to 369 V
Transients:
Peak Pulse Current (I
TM
)
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
TM
) 0.4 to 23 3.5 to 75 70 to 160 J
Operating Ambient Temperature Range (T
A
) -55 to +125 -55 to +125 -55 to +125 ºC
Storage Temperature Range (T
STG
) -55 to +150 -55 to +150 -55 to +150 ºC
Temperature Coefficient (a V ) of Clamping Voltage (V
C
) at Specified Test Current <0.01 <0.01 <0.01 %/ºC
Hi-Pot Encapsulation (COATING Isolation Voltage Capability)
(Delectric must withstand indicated DC voltage for one minute per MIL-STD 202, Method 301)
5000 5000 5000 V
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.
RoHS
• 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
: 4 – 275V
V
M(DC): 5.5 – 369V
• High energy absorption
capability W
TM
up to 140J
• 3 model sizes available
A8, RA16, and RA22