MRA Datasheet

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
POWER RATING (1)
POWER RATING (1)
TOLERANCE (2)
P25 °C W
P25 °C W
%
CHARACTERISTIC U + 250 °C CHARACTERISTIC V + 350 °C
RESISTANCE
RANGE

WEIGHT
(typical)
g
1, 5, 10
0.01 to 15.0K
1.00
1, 5, 10
0.05 to 35.0K
3.87
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
5.02
GLOBAL
MODEL
HISTORICAL
MODEL
MRA-05
MRA05
4.0
5.0
MRA-10
MRA10
7.0
10.0
TECHNICAL SPECIFICATIONS
PARAMETER
Temperature Coefficient
UNIT
MRA RESISTOR CHARACTERISTICS
ppm/°C
± 30 for 10  and above; ± 50 for 1.0  to 9.9 ; ± 90 for 0.5  to 0.99 
Terminal Strength
lb
10 minimum
Dielectric Withstanding Voltage
VAC
500 for MRA-05 and 1000 for MRA-10 and MRA-12
Operating Temperature Range
°C
Characteristic U = - 65 to + 250, Characteristic V = - 65 to + 350
Maximum Working Voltage
V
(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
GLOBAL MODEL
(6 digits)
VALUE
(5 digits)
TOLERANCE
(1 digit)
PACKAGING CODE
(3 digits)
SPECIAL
(up to 2 digits)
(See Standard Electrical
Specifications Global
Model column
for options)
R = Decimal
K = Thousand
1R500 = 1.5 
1K500 = 1.5 k
F = ± 1.0 %
J = ± 5.0 %
K = ± 10.0 %
E07 = Tape/reel (MRA-10, MRA-12)
E48 = Tape/reel (MRA-05)
E12 = Bulk, up to 100 pc boxes
(Dash Number)
From 1 to 99
as applicable
Historical Part Number example: MRA12W25R0J
MRA12
W = STANDARD
25 
5%
HISTORICAL MODEL
TC
RESISTANCE VALUE
TOLERANCE
Revision: 02-May-12
Document Number: 31801
1
For technical questions, contact: [email protected]
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
Vishay Mills
DIMENSIONS in inches [millimeters]
1.50 [38.10]
min.
D
L
LD
L1
DIMENSIONS in inches [millimeters]
MODEL
L
± 0.062 [1.57]
L1 Max.
D
± 0.031 [0.79]
LD
± 0.002 [0.051]
MRA-05
0.562 [14.27]
0.650 [16.51]
0.167 [4.24]
0.032 [0.813]
MRA-10
0.875 [22.22]
0.975 [24.76]
0.312 [7.92]
0.040 [1.016]
MRA-12
1.188 [30.18]
1.280 [32.51]
0.312 [7.92]
0.040 [1.016]
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
RATED POWER IN %
DERATING
MATERIAL SPECIFICATIONS
Part Marking: MILLS, model, value, tolerance, date code
120
100
80
Characteristic V
60
40
Characteristic U
20
0
- 50
- 65
0
50
25
150
250
350
AMBIENT TEMPERATURE IN °C
PERFORMANCE
TEST
CONDITIONS OF TEST
TEST LIMITS
(CHARACTERISTIC U)
(CHARACTERISTIC V)
Dielectric Withstanding
Voltage
1000 VRMS, 1 min
± (0.1 % + 0.05 ) R
± (0.1 % + 0.05 ) R
High Frequency
Vibration
Frequency varied 10 Hz to 2000 Hz, 20 g peak,
2 directions 6 h each
± (0.1 % + 0.05 ) R
± (0.2 % + 0.05 ) R
High Temperature
Exposure
250 h at + 250 °C for U Characteristic,
+ 350 °C for V Characteristic
± (0.5 % + 0.05 ) R
± (4.0 % + 0.05 ) R
Load Life
2000 h at rated power, + 25 °C, 1.5 h “ON”, 0.5 h “OFF”
± (0.5 % + 0.05 ) R
± (3.0 % + 0.05 ) R
Low Temperature
Storage
- 65 °C for 24 h
± (0.2 % + 0.05 ) R
± (2.0 % + 0.05 ) R
Moisture Resistance
MIL-STD 202 Method 106
± (0.2 % + 0.05 ) R
± (2.0 % + 0.05 ) R
Shock, Specified Pulse
MIL-STD 202 Method 213, 100 g’s for 6 ms, 10 shocks
± (0.1 % + 0.05 ) R
± (0.2 % + 0.05 ) R
Thermal Shock
Rated power applied until thermally stable,
then 15 min at - 55 °C
± (0.2 % + 0.05 ) R
± (2.0 % + 0.05 ) R
Short Time Overload
5 x rated power (5 W smaller),
10 x rated power (7 W and larger) for 5 s
± (0.2 % + 0.05 ) R
± (2.0 % + 0.05 ) R
Terminal Strength
5 s to 10 s 10 pound pull test;
torsion test - 3 alternating directions, 360 ° each
± (0.1 % + 0.05 ) R
± (1.0 % + 0.05 ) R
Revision: 02-May-12
Document Number: 31801
2
For technical questions, contact: [email protected]
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.
Material Category Policy
Vishay Intertechnology, Inc. hereby certifies that all its products that are identified as RoHS-Compliant fulfill the
definitions and restrictions defined under Directive 2011/65/EU of The European Parliament and of the Council
of June 8, 2011 on the restriction of the use of certain hazardous substances in electrical and electronic equipment
(EEE) - recast, unless otherwise specified as non-compliant.
Please note that some Vishay documentation may still make reference to RoHS Directive 2002/95/EC. We confirm that
all the products identified as being compliant to Directive 2002/95/EC conform to Directive 2011/65/EU.
Vishay Intertechnology, Inc. hereby certifies that all its products that are identified as Halogen-Free follow Halogen-Free
requirements as per JEDEC JS709A standards. Please note that some Vishay documentation may still make reference
to the IEC 61249-2-21 definition. We confirm that all the products identified as being compliant to IEC 61249-2-21
conform to JEDEC JS709A standards.
Revision: 02-Oct-12
1
Document Number: 91000