MRA
www.vishay.com
Vishay Mills
Wirewound Resistors, Non-Magnetic,
Non-Inductive, Axial Lead
FEATURES
• High temperature coating (> 350 °C)
• Non-magnetic and all welded constructions
greatly
enhance
frequency
response.
Combined with non-inductive Ayrton-Perry
winding the inductive reactance and signal loss
are almost totally eliminated.
• Ideal for Audio Industry
• Material categorization: For definitions of
compliance please see
www.vishay.com/doc?99912
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL
MODEL
MRA-05
MRA-10
HISTORICAL
MODEL
MRA05
MRA10
POWER RATING
(1)
POWER RATING
(1)
TOLERANCE
(2)
P
25 °C
W
P
25 °C
W
%
CHARACTERISTIC U + 250 °C CHARACTERISTIC V + 350 °C
4.0
7.0
5.0
10.0
1, 5, 10
1, 5, 10
RESISTANCE
RANGE
0.01 to 15.0K
0.05 to 35.0K
WEIGHT
(typical)
g
1.00
3.87
5.02
MRA-12
MRA12
10.0
12.0
1, 5, 10
0.05 to 85.0K
Notes
(1)
Vishay Mills MRA models have two power ratings depending on the operation temperature and stability requirements.
(2)
Other tolerances may be available, contact factory
TECHNICAL SPECIFICATIONS
PARAMETER
Temperature Coefficient
Terminal Strength
Dielectric Withstanding Voltage
Operating Temperature Range
Maximum Working Voltage
UNIT
ppm/°C
lb
V
AC
°C
V
MRA RESISTOR CHARACTERISTICS
± 30 for 10
and above; ± 50 for 1.0
to 9.9
;
± 90 for 0.5
to 0.99
10 minimum
500 for MRA-05 and 1000 for MRA-10 and MRA-12
Characteristic U = - 65 to + 250, Characteristic V = - 65 to + 350
(P x
R)
1/2
GLOBAL PART NUMBER INFORMATION
Global Part Numbering example: MRA-1225R00JE12
(visit
www.vishay.net
Vishay Dale parts numbering manual for all options)
M
R
A
-
1
2
2
5
R
0
0
J
E
1
2
SPECIAL
(up to 2 digits)
(Dash Number)
From
1
to
99
as applicable
GLOBAL MODEL
(6 digits)
(See Standard Electrical
Specifications Global
Model column
for options)
VALUE
(5 digits)
R
= Decimal
K
= Thousand
1R500
= 1.5
1K500
= 1.5 k
TOLERANCE
(1 digit)
F
= ± 1.0 %
J
= ± 5.0 %
K
= ± 10.0 %
PACKAGING CODE
(3 digits)
E07
= Tape/reel (MRA-10, MRA-12)
E48
= Tape/reel (MRA-05)
E12
= Bulk, up to 100 pc boxes
Historical Part Number example: MRA12W25R0J
MRA12
HISTORICAL MODEL
W = STANDARD
TC
25
RESISTANCE VALUE
5%
TOLERANCE
Revision: 02-May-12
Document Number: 31801
1
For technical questions, contact:
ww2aresistors@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
MRA
www.vishay.com
DIMENSIONS
in inches [millimeters]
1.50 [38.10]
min.
L
D
LD
Vishay Mills
L
1
DIMENSIONS
in inches [millimeters]
MODEL
MRA-05
MRA-10
MRA-12
L
± 0.062 [1.57]
0.562 [14.27]
0.875 [22.22]
1.188 [30.18]
L
1
Max.
0.650 [16.51]
0.975 [24.76]
1.280 [32.51]
D
± 0.031 [0.79]
0.167 [4.24]
0.312 [7.92]
0.312 [7.92]
LD
± 0.002 [0.051]
0.032 [0.813]
0.040 [1.016]
0.040 [1.016]
MATERIAL SPECIFICATIONS
Element:
Copper-nickel alloy or nickel-chrome alloy,
depending on resistance value
Core:
Ceramic: Alumina
Coating:
Special high temperature silicone
Standard Terminals:
Tinned copper
End Caps:
Copper alloy
Part Marking:
MILLS, model, value, tolerance, date code
DERATING
RATED POWER IN %
120
100
80
60
40
20
0
- 50
- 65
0
25
Characteristic V
Characteristic U
50
150
250
350
AMBIENT TEMPERATURE IN °C
PERFORMANCE
TEST
Dielectric Withstanding
Voltage
High Frequency
Vibration
High Temperature
Exposure
Load Life
Low Temperature
Storage
Moisture Resistance
Shock, Specified Pulse
Thermal Shock
Short Time Overload
Terminal Strength
CONDITIONS OF TEST
1000 V
RMS
, 1 min
Frequency varied 10 Hz to 2000 Hz, 20
g
peak,
2 directions 6 h each
250 h at + 250 °C for U Characteristic,
+ 350 °C for V Characteristic
2000 h at rated power, + 25 °C, 1.5 h “ON”, 0.5 h “OFF”
- 65 °C for 24 h
MIL-STD 202 Method 106
MIL-STD 202 Method 213, 100
g’s
for 6 ms, 10 shocks
Rated power applied until thermally stable,
then 15 min at - 55 °C
5 x rated power (5 W smaller),
10 x rated power (7 W and larger) for 5 s
5 s to 10 s 10 pound pull test;
torsion test - 3 alternating directions, 360 ° each
TEST LIMITS
(CHARACTERISTIC U)
± (0.1 % + 0.05
) R
± (0.1 % + 0.05
) R
± (0.5 % + 0.05
) R
± (0.5 % + 0.05
) R
± (0.2 % + 0.05
) R
± (0.2 % + 0.05
) R
± (0.1 % + 0.05
) R
± (0.2 % + 0.05
) R
± (0.2 % + 0.05
) R
± (0.1 % + 0.05
) R
(CHARACTERISTIC V)
± (0.1 % + 0.05
) R
± (0.2 % + 0.05
) R
± (4.0 % + 0.05
) R
± (3.0 % + 0.05
) R
± (2.0 % + 0.05
) R
± (2.0 % + 0.05
) R
± (0.2 % + 0.05
) R
± (2.0 % + 0.05
) R
± (2.0 % + 0.05
) R
± (1.0 % + 0.05
) R
Revision: 02-May-12
Document Number: 31801
2
For technical questions, contact:
ww2aresistors@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
Legal Disclaimer Notice
www.vishay.com
Vishay
Disclaimer
ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE
RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE.
Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively,
“Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other
disclosure relating to any product.
Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or
the continuing production of any product. To the maximum extent permitted by applicable law, Vishay disclaims (i) any and all
liability arising out of the application or use of any product, (ii) any and all liability, including without limitation special,
consequential or incidental damages, and (iii) any and all implied warranties, including warranties of fitness for particular
purpose, non-infringement and merchantability.
Statements regarding the suitability of products for certain types of applications are based on Vishay’s knowledge of
typical requirements that are often placed on Vishay products in generic applications. Such statements are not binding
statements about the suitability of products for a particular application. It is the customer’s responsibility to validate that a
particular product with the properties described in the product specification is suitable for use in a particular application.
Parameters provided in datasheets and / or specifications may vary in different applications and performance may vary over
time. All operating parameters, including typical parameters, must be validated for each customer application by the customer’s
technical experts. Product specifications do not expand or otherwise modify Vishay’s terms and conditions of purchase,
including but not limited to the warranty expressed therein.
Except as expressly indicated in writing, Vishay products are not designed for use in medical, life-saving, or life-sustaining
applications or for any other application in which the failure of the Vishay product could result in personal injury or death.
Customers using or selling Vishay products not expressly indicated for use in such applications do so at their own risk.
Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for
such applications.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document
or by any conduct of Vishay. Product names and markings noted herein may be trademarks of their respective owners.
© 2017 VISHAY INTERTECHNOLOGY, INC. ALL RIGHTS RESERVED
Revision: 08-Feb-17
1
Document Number: 91000
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