RW, RW E, RW Ni
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Revision: 02-Jun-16 1Document Number: 21005
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Vitreous Wirewound Resistors acc. MIL-PRF-26
The RW series, with completely welded construction, is the
perfect choice for high continuous power dissipation up to
480 W with the option for adjustable (RW E) and
non-inductive types (RW Ni). The components of this series
are well suited for harsh environments and exhibit a long
lifetime. With their high pulse power capabilities and high
operating voltages, they are an ideal choice for inrush
limiters. Typical applications include but are not limited to
drive systems, frequency inverters, AC and DC filters,
HVDC, SVC, and snubber resistors. Particular requirements
can be submitted to a Vishay Draloric application engineer
specifying peak voltage, pulse shape, pulse duration, and
environmental conditions for review.
FEATURES
• Very high operating voltage
• Excellent pulse load capability
• Models acc. to MIL-PRF-26 available
• Adjustable type (E) available
• Non inductive type (Ni) available
• Non-flammable and enhanced humidity protection
• Material categorization: for definitions of compliance
please see www.vishay.com/doc?99912
APPLICATIONS
• Inrush current limiter
• Capacitor charge / discharge
• Snubber resistor
• Brake resistor
• Filter resistor
TECHNICAL SPECIFICATION
TYPE /
VARIANT
RATED
DISSIPATION
P40
RESISTANCE RANGE
(1)
TCR
-10 ppm/K to -80 ppm/K
RESISTANCE RANGE
(2)
TCR
+100 ppm/K to +180 ppm/K
RESISTANCE
TOLERANCE
OPERATING
VOLTAGE
Umax.
RW 10/44 18 W 1.0 to 3.0 3.3 to 36 k
±5 %, ±10 %
400 VRW 10/44 E 11 W 1.0 to 3.0 3.3 to 1.6 k
RW 10/44 Ni 11 W - 6.2 to 2.4 k
RW 12/25 11 W 0.39 to 1.3 1.5 to 13 k120 V
RW 12/38 15 W 1.0 to 2.7 3.0 to 33 k
350 VRW 12/38 E 14 W - 4.3 to 1.5 k
RW 12/38 Ni 14 W - 5.6 to 2.2 k
RW 12/51 25 W 1.0 to 3.9 4.3 to 56 k
600 VRW 12/51 E 17 W 1.0 to 4.3 4.7 to 2.4 k
RW 12/51 Ni 17 W - 9.1 to 3.6 k
RW 12/76 45 W 2.0 to 6.8 7.5 to 91 k
1000 V
RW 12/76 E 27 W 2.0 to 6.8 7.5 to 4.3 k
RW 12/76 Ni 27 W - 16 to 6.2 k
RW 20/76 70 W 1.0 to 11 12 to 75 k
RW 20/76 E 42 W 1.0 to 11 12 to 6.8 k
RW 20/76 Ni 42 W - 24 to 10 k
RW 20/102 90 W 3.0 to 16 18 to 110 k
1400 VRW 20/102 E 55 W 3.0 to 16 18 to 10 k
RW 20/102 Ni 55 W - 36 to 15 k
RW 30/102 130 W 7.5 to 10 2.7 to 6.8
1600 V
11 to 160 k
RW 30/102 E 80 W 7.5 to 10 2.7 to 6.8
11 to 15 k
RW, RW E, RW Ni
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Revision: 02-Jun-16 2Document Number: 21005
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Notes
• The operating temperature range for these resistors is from -55 °C up to 350 °C.
• Resistance values are to be selected for ± 10 % from the E12 series, and for ± 5 from the E24 series.
(1) Values with the TCR of -10 ppm/K to -80 ppm/K are produced with corrugated ribbon.
(2) Low ohmic values with the TCR of +100 ppm/K to +180 ppm/K are produced with corrugated ribbon.
(3) Types according to MIL-PRF-26.
RW 30/152 220 W 12 to 16 4.7 to 11
±5 %, ±10 %
2500 V
18 to 200 k
RW 30/152 E 130 W 12 to 16 4.7 to 11
18 to 24 k
RW 30/203 300 W 16 to 22 6.8 to 15
3600 V
24 to 270 k
RW 30/203 E 180 W 16 to 22 6.8 to 15
24 to 36 k
RW 30/267 400 W 24 to 30 8.2 to 22
5000 V
33 to 390 k
RW 30/267 E 240 W 24 to 30 8.2 to 22
33 to 47 k
RW 30/305 480 W 27 to 36 10 to 24
6000 V
39 to 300 k
RW 30/305 E 290 W 27 to 36 10 to 24
39 to 56 k
RW 29 (3) 11 W - 4.3 to 5.6 k
±5 %
400 V
RW 30 (3) 11 W - 3.6 to 2.7 k120 V
RW 31 (3) 14 W - 3.9 to 6.8 k350 V
RW 32 (3) 17 W - 4.3 to 10 k600 V
RW 33 (3) 26 W - 8.2 to 18 k1000 V
RW 35 (3) 55 W - 18 to 43 k1400 V
RW 36 (3) 78 W - 24 to 56 k1600 V
RW 37 (3) 113 W - 33 to 91 k2500 V
RW 38 (3) 159 W - 47 to 150 k3600 V
RW 47 (3) 210 W - 75 to 180 k5000 V
TECHNICAL SPECIFICATION
TYPE /
VARIANT
RATED
DISSIPATION
P40
RESISTANCE RANGE
(1)
TCR
-10 ppm/K to -80 ppm/K
RESISTANCE RANGE
(2)
TCR
+100 ppm/K to +180 ppm/K
RESISTANCE
TOLERANCE
OPERATING
VOLTAGE
Umax.
RW, RW E, RW Ni
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Revision: 02-Jun-16 3Document Number: 21005
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Note
(1) Types according to MIL-PRF-26.
TERMINALS
SL FST
TYPE / VARIANT Lug for soldering Fast on terminal with 6.3 mm x 0.8 mm
DIN 46244
RW 10/44
RW 10/44 E
RW 10/44 Ni
RW 29 (1)
e = 3.2 mm
e = 1.65 mm
b = 6.3 mm
RW 12/25
RW 30 (1) -
RW 12/38
RW 12/38 E
RW 12/38 Ni
RW 31 (1)
e = 1.65 mm
b = 6.3 mm
RW 12/51
RW 12/51 E
RW 12/51 Ni
RW 32 (1)
RW 12/76
RW 12/76 E
RW 12/76 Ni
RW 33 (1)
RW 20/76
RW 20/76 E
RW 20/76 Ni
e = 4.2 mm
RW 20/102
RW 20/102 E
RW 20/102 Ni
RW 35 (1)
RW 30/102
RW 30/102 E
RW 36 (1)
RW 30/152
RW 30/152 E
RW 37 (1)
RW 30/203
RW 30/203 E
RW 38 (1)
RW 30/267
RW 30/267 E
RW 47 (1)
RW 30/305
RW 30/305 E
e
e
b
RW, RW E, RW Ni
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Revision: 02-Jun-16 4Document Number: 21005
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Notes
• The products can be ordered using either the PRODUCT DESCRIPTION or the PART NUMBER.
(1) For special windings or the non-inductive (RW Ni) versions, please contact: ww1resistors@vishay.com.
PACKAGING
TYPE PACKAGING
CODE QUANTITY FORMAT DIMENSION OF PACKAGE
All LX Variable Bulk, separately packed with paper Box size selection according to quantity
and product size
PART NUMBER AND PRODUCT DESCRIPTION
Part Number: RW0104411009JLX000
MODEL SPECIAL CHARACTER VALUE TOLERANCE
CODE
PACKAGING
CODE SPECIAL
RW01044 = RW 10/44
RW01225 = RW 12/25
RW01238 = RW 12/38
RW01251 = RW 12/51
RW01276 = RW 12/76
RW02076 = RW 20/76
RW20102 = RW 20/102
RW30102 = RW 30/102
RW30152 = RW 30/152
RW30203 = RW 30/203
RW30267 = RW 30/267
RW30305 = RW 30/305
RW00029 = RW 29
RW00030 = RW 30
RW00031 = RW 31
RW00032 = RW 32
RW00033 = RW 33
RW00035 = RW 35
RW00036 = RW 36
RW00037 = RW 37
RW00038 = RW 38
RW00047 = RW 47
0 = neutral
1 = E
7 = FST
C = E FST
3 digit value
1 digit multiplier
MULTIPLIER
7 = *10-3
8 = *10-2
9 = *10-1
0 = *100
1 = *101
2 = *102
3 = *103
J = ± 5 %
K = ± 10 %
LX =
loose pack
without quantity
000 = standard
3 digit code =
customized version (1)
Product Description: RW 10/44 E 10R 5 %
RW 10/44 E 10R 5 %
TYPE VARIANT / TERMINAL RESISTANCE TOLERANCE CODE
RW10/44
RW12/35
RW12/38
RW12/51
RW12/76
RW20/76
RW20/102
RW30/102
RW30/152
RW30/203
RW30/267
RW30/305
RW29
…
RW47
Neutral
E (adjustable)
FST
E FST
R39 = 0.39
300K = 300 k
± 5 %
± 10 %
1044 1001W0 JLX 09R 00
RW, RW E, RW Ni
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Revision: 02-Jun-16 5Document Number: 21005
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DESCRIPTION
The rugged design and durable coating of Vitreous
wirewound resistors enable them to withstand extreme
environmental stress. For this reason they are well suited for
use in demanding environmental conditions. The glaze is
fired layer by layer several times at high temperatures
(> 600 °C). This vitreous coating is designed for high stability
and a long lifetime in humid environments and is resistant to
all cleaning chemicals commonly used in the electronic
industry.
Production is strictly controlled and follows an extensive set
of instructions established for reproducibility. The winding is
done with specific materials on a specially developed fine
ceramic body (Al2O3). The ceramic used meets the highest
requirements against mechanical resistance, thermal shock,
dielectric strength, and insulation resistance at high
temperatures. With different diameters and turn spacings, a
large ohmic value range can be offered.
The resistors are marked with resistance and tolerance.
The RW series meets single lot / date code packaging
requirements.
MATERIALS
Vishay acknowledges the following systems for the
regulation of hazardous substances:
• IEC 62474, Material Declaration for Products of and for the
Electrotechnical Industry, with the list of declarable
substances given therein (1)
• The Global Automotive Declarable Substance List
(GADSL) (2)
• The REACH regulation (1907/2006/EC) and the related list
of substances with very high concern (SVHC) (3) for its
supply chain
The products do not contain any of the banned substances
as per IEC 62474, GADSL, or the SVHC list, see
www.vishay.com/how/leadfree.
Hence the products fully comply with the following
directives:
• 2000/53/EC End-of-Life Vehicle Directive (ELV) and
Annex II (ELV II)
• 2011/65/EU Restriction of the Use of Hazardous
Substances Directive (RoHS) with amendment
2015/863/EU
• 2012/19/EU Waste Electrical and Electronic Equipment
Directive (WEEE)
Vishay pursues the elimination of conflict minerals from its
supply chain, see the Conflict Minerals Policy at
www.vishay.com/doc?49037.
ASSEMBLY
The resistors are available with lug style terminals for
soldering assembly processes or with fast plug terminals
(FST style) for assembly / disassembly processes. The
terminals of the resistors are completely lead (Pb)-free. The
special tin plating used provides compatibility with lead
(Pb)-free and lead-containing soldering processes.
Special lugs are available on request, please inquire at
ww1resistors@vishay.com.
3D-Models are available on request, please inquire at
ww1resistors@vishay.com.
Different mounting accessories are available, see the
datasheet: www.vishay.com/doc?21015.
The slider of the adjustable type should be only moved after
removal of voltage and sufficient loosening of the screw.
APPLICATION INFORMATION
The power dissipation of the resistor generates a
temperature rise with respect to the ambient. The
permissible dissipation is derated for temperatures above
40°C, as shown in the derating diagram, in order to avoid
overheating of the resistor. The heat dissipated from the
resistor may affect adjacent components, hence proper
clearance will be required in order to avoid overheating.
All materials used are non-flammable and inorganic.
These resistors do not feature a limited lifetime when
operated within the permissible limits. However, resistance
value drift increasing over operating time may result in
exceeding a limit acceptable to the specific application,
thereby establishing a functional lifetime.
RELATED PRODUCTS
In lower continuous power applications and less demanding
environmental conditions the cement coated alternative, like
the ZWS series might be suitable, see the datasheet:
“Cemented Wirewound Resistors with Lugs”
www.vishay.com/doc?21010
For low ohmic values and rated dissipation up to 1000 W,
there is the vitreous coated GBS series, see the datasheet:
“Vitreous Wirewound Resistors with Corrugated Ribbon”
www.vishay.com/doc?21004
For higher power dissipation and different lugs, there is the
vitreous coated GWS series, see the datasheet:
“Vitreous Wirewound Resistors with Lugs”
www.vishay.com/doc?21003
Notes
(1) The IEC 62474 list of declarable substances is maintained in a dedicated database, which is available at http://std.iec.ch/iec62474.
(2) The Global Automotive Declarable Substance List (GADSL) is maintained by the American Chemistry Council, and available at
www.gadsl.org.
(3) The SVHC list is maintained by the European Chemical Agency (ECHA) and available at http://echa.europa.eu/candidate-list-table.
RW, RW E, RW Ni
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Revision: 02-Jun-16 6Document Number: 21005
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DERATING
TEMPERATURE RISE
10
100
1000
10000
0
20
40
60
80
100
120
-100 -50 0 50 100 150 200 250 300 350
Axis Title
Transient Thermal Impedance
Transient Thermal Impedance
2nd line
Rated Dissipation (%)
Ambient Temperature (°C)
2nd line
40-55
10
100
1000
10000
0
100
200
300
400
500
0 5 10 15 20 25
Axis Title
Transient Thermal Impedance
Transient Thermal Impedance
2nd line
Temperature Rise (K)
Dissipation (W)
2nd line
RW 12/25 RW 10/44
MIL-PRF-26
Char. V
10
100
1000
10000
0
100
200
300
400
500
0 5 10 15 20 25
Axis Title
Transient Thermal Impedance
Transient Thermal Impedance
2nd line
Temperature Rise (K)
Dissipation (W)
2nd line
RW 12/38
RW 12/51
MIL-PRF-26
Char. V
RW, RW E, RW Ni
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TEMPERATURE RISE
10
100
1000
10000
0
100
200
300
400
500
0 20406080
Transient Thermal Impedance
Transient Thermal Impedance
2nd line
Temperature Rise (K)
Dissipation (W)
2nd line
RW 12/76 RW 20/76
MIL-PRF-26
Char. V
10
100
1000
10000
0
100
200
300
400
500
0 255075100125150
Transient Thermal Impedance
Transient Thermal Impedance
2nd line
Temperature Rise (K)
Dissipation (W)
2nd line
RW 20/102 RW 30/102
MIL-PRF-26
Char. V
10
100
1000
10000
0
100
200
300
400
500
0 50 100 150 200 250 300
Transient Thermal Impedance
Transient Thermal Impedance
2nd line
Temperature Rise (K)
Dissipation (W)
2nd line
RW 30/152 RW 30/203
MIL-PRF-26
Char. V
10
100
1000
10000
0
100
200
300
400
500
0 100 200 300 400 500
Transient Thermal Impedance
Transient Thermal Impedance
2nd line
Temperature Rise (K)
Dissipation (W)
2nd line
RW 30/267 RW 30/305
MIL-PRF-26
Char. V
RW, RW E, RW Ni
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Notes
(1) Numbers in (parenthesis) represent the dimension Dmax. for resistor produced with corrugated ribbon.
(2) Types according to MIL-PRF-26.
DIMENSIONS AND MASS
TYPE /
VARIANT
Dmax. (1)
(mm)
L
(mm)
a
(mm)
a1
(mm)
b
(mm)
b1
(mm)
c
(mm)
c1
(mm)
d
(mm)
e
(mm)
e1
(mm)
s
(mm)
MASS
(g)
RW 10/44
RW 10/44 E
RW 10/44 Ni
RW 29 (2)
12.7
(15.7) 44.4 ± 1.6 33.4 31.4 6.0 5.0 16.5 18.5 4.5 3.2 2.8 0.6 10
RW 12/25
RW 30 (2)
15.1
(18.1) 25.4 ± 1.6 14.4 - 6.0 - 17.5 - 5.5 3.2 - 0.6 10
RW 12/38
RW 12/38 E
RW 12/38 Ni
RW 31 (2)
15.1
(18.1) 38.1 ± 1.6 27.1 25.1 6.0 5.0 17.5 19.0 5.5 3.2 3.2 0.6 10
RW 12/51
RW 12/51 E
RW 12/51 Ni
RW 32 (2)
15.1
(18.1) 50.8 ± 1.6 39.8 37.8 6.0 5.0 17.5 19.0 5.5 3.2 3.2 0.6 15
RW 12/76
RW 12/76 E
RW 12/76 Ni
RW 33 (2)
15.1
(18.1) 76.2 ± 1.6 65.2 63.2 6.0 5.0 17.5 19.0 5.5 3.2 3.2 0.6 15
RW 20/76
RW 20/76 E
RW 20/76 Ni
23.0
(26.0) 76.2 ± 1.6 63.2 63.2 8.0 5.0 22.0 23.0 12.0 4.2 3.2 0.8 30
RW 20/102
RW 20/102 E
RW 20/102 Ni
RW 35 (2)
23.0
(26.0) 101.6 ± 1.6 88.6 88.6 8.0 5.0 22.0 23.0 12.0 4.2 3.2 0.8 62
RW 30/102
RW 30/102 E
RW 36 (2)
33.3
(36.3) 101.6 ± 1.6 88.6 88.6 8.0 8.0 31.0 27.0 18.5 4.2 4.2 0.8 136
RW 30/152
RW 30/152 E
RW 37 (2)
33.3
(36.3) 152.4 ± 1.6 139.4 139.4 8.0 8.0 31.0 27.0 18.5 4.2 4.2 0.8 200
RW 30/203
RW 30/203 E
RW 38 (2)
33.3
(36.3) 203.2 ± 1.6 190.2 190.2 8.0 8.0 31.0 27.0 18.5 4.2 4.2 0.8 260
RW 30/267
RW 30/267 E
RW 47 (2)
33.3
(36.3) 266.7 ± 1.6 253.7 253.7 8.0 8.0 31.0 27.0 18.5 4.2 4.2 0.8 330
RW 30/305
RW 30/305 E
33.3
(36.3) 304.8 ± 1.6 291.8 291.8 8.0 8.0 31.0 27.0 18.5 4.2 4.2 0.8 430
2.5
[0.098]
e
a
b
L
d
c
s
D
max.
b
1
e
1
Adjustable lug with
contact stud
2.5
[0.098]
c
1
1.65 + 0.1
[0.065 + 0.004]
6.3 + 0.1
[0.248 + 0.004]
0.8 [0.030]
thickness
4 + 0.5
[0.157 + 0.020]
8 ± 0.1
[0.310 + 0.004]
a
1
FST A 6.3 mm/DIN 46244
(at end terminals only)
Legal Disclaimer Notice
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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.
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