RMB, RMBS
Vishay Sfernice
Molded Precision Wirewound Resistors
Axial Leads
FEATURES
•
•
•
•
•
•
•
•
•
•
0.75 W to 3 W at 25 °C
NF C 83-210
CECC 40201-005
Low temperature coefficient
≤
± 50 ppm/°C
Low ohmic values 15 mΩ available
Excellent behavior against humidity
Electrical insulation
Mechanical strength
Accurate sizes
Termination = Sn/Ag/Cu or pure matte tin according to the
ohmic value
High stability and low temperature coefficient are the main features of the precision wirewound resistors type RMB RMBS models
just as maintenance parts. Their performances can be compared with those of the best film resistors but they have in addition a
greater power rating. RMBS styles meet the more severe requirements of NF C 83-210 (all RMBS styles are approved) and
characteristic U of MIL-R-26 E (approximate size of RW 70 and 79 resistors) specifications. The two models RMB and RMBS
have a similar construction. RMBS are submitted, in addition to a process which further increases the stability. On request,
non-inductive resistors are available under the reference RMB
NI.
DIMENSIONS
in millimeters
25 min.
A
25 min.
SERIES
AND STYLE
A max.
Ø B max.
E ± 0.1
RMB 0.75
RMBS 0.5
7
2.5
0.6
0.3
RMB 1.5
RMBS 1
10.2
4
0.6
0.7
RMB 3
RMBS 2
16.2
6.4
0.8
1.5
ØE
ØB
Weight in g
TECHNICAL SPECIFICATIONS
VISHAY SFERNICE SERIES AND STYLE
NF C 83-210
CECC 40201-005
Power
Rating
at 25 °C
at 70 °C
± 5 % E24
± 2 % E48
Ohmic Range
in Relation
to Tolerance
± 1 % E96
± 0.5 % E96
± 0.1 %
Qualified Ohmic Range
NF C 83-210
Limiting Element Voltage
Critical Resistance
Undergoes European Quality Insurance System (CECC)
-
Not applicable
-
120 V
RMB 0.75
-
-
0.75 W
0.6 W
0.1
Ω
2 kΩ
0.1
Ω
2 kΩ
0.1
Ω
2 kΩ
0.4
Ω
2 kΩ
RMB 1.5
-
-
1.5 W
1.2 W
0.1
Ω
6.81 kΩ
0.1
Ω
6.81 kΩ
0.1
Ω
6.81 kΩ
0.4
Ω
6.81 kΩ
RMB 3
-
-
3W
2.4 W
0.051
Ω
13 kΩ
0.08
Ω
12.3 kΩ
0.1
Ω
12.4 kΩ
0.3
Ω
12.4 kΩ
Please consult
VISHAY SFERNICE
-
200 V
1
Ω
174
Ω
not applicable
1
Ω
590
Ω
120 V
1
Ω
1.3 kΩ
200 V
RMBS 0.5
RP1
A
0.5 W
0.4 W
0.1
Ω
2 kΩ
0.1
Ω
2 kΩ
0.1
Ω
2 kΩ
0.4
Ω
2 kΩ
RMBS 1
RP2
B
1W
0.8 W
0.1
Ω
6.81 kΩ
0.1
Ω
6.81 kΩ
0.1
Ω
6.81 kΩ
0.4
Ω
6.81 kΩ
RMBS 2
RP3
C
2W
1.6 W
0.015
Ω
13 kΩ
0.078
Ω
12.4 kΩ
0.1
Ω
12.4 kΩ
0.3
Ω
12.4 kΩ
Out of nominal ohmic range
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44
For technical questions, contact: sfer@vishay.com
Document Number: 50010
Revision: 21-Jan-08
RMB, RMBS
Molded Precision Wirewound Resistors
Axial Leads
PERFORMANCE
TESTS
Dielectric W/s Voltage
Short Time Overload
Climatic Sequence
Humidity (Steady State)
Thermal Shock
CONDITIONS
500 VRMS
5 Pn at 25 °C/5 s
NF C 83-210
- 55 °C/+ 200 °C
5 cycles
NF C 83-210
56 days 95 % R.H.
Load at 100 % P followed
by cold temp. exposure
at - 55 °C
MIL-STD-202
Method 204 - Test D: 20 g
10/2000 Hz
MIL-STD-202
Method 108 Pr 2000 h
MIL-STD-202
Method 106
1000 h at + 200 °C
MIL-STD-202
100 g Method 205 Test C
REQUIREMENTS
MIL-R-26 E
± (0.1 % + 0.05
Ω)
± (0.2 % + 0.05
Ω)
-
-
± (0.2 % + 0.05
Ω)
± (0.2 % + 0.05
Ω)
± (0.5 % + 0.05
Ω)
± (0.2 % + 0.05
Ω)
Insulation resistance
> 100 MΩ
± (0.5 % + 0.05
Ω)
± (0.1 % + 0.05
Ω)
NF C 83-210
-
± 0.25 % + 0.05
Ω
TYPICAL VALUES AND DRIFTS
RMB
RMBS
± (0.05 % + 0.01
Ω)
± (0.05 % + 0.01
Ω)
± (0.1 % + 0.01
Ω)
± (0.05 % + 0.01
Ω)
Vishay Sfernice
± 0.25 % + 005
Ω
± (0.1 % + 0.01
Ω)
± (0.05 % + 0.01
Ω)
Insulation R > 100 MΩ
> 10
4
MΩ
> 10
4
MΩ
± 0.25 % + 0.05
Ω
± (0.1 % + 0.01
Ω)
± (0.05 % + 0.01
Ω)
> 10
4
MΩ
Insulation R > 100 MΩ
> 10
4
MΩ
-
± 0.25 % + 0.05
Ω
± 0.25 % + 0.05
Ω
1000 h at 25 °C
-
± 0.5 % + 0.05
Ω
Insulation R > 1 GΩ
± 0.25 % + 0.05
Ω
± (0.2 % + 0.01
Ω)
(0.1 % + 0.01
Ω)
Vibration
Load Life
Moisture Resistance
High Temperature
Shock
± (0.01 % + 0.01
Ω)
± (0.01 % + 0.01
Ω)
± (1 % + 0.01
Ω)
± (0.15 % + 0.01
Ω)
± (0.1 % + 0.01
Ω)
± (0.05 % + 0.01
Ω)
> 10
3
MΩ
> 10
3
MΩ
±1%
± 0.05 %
± 0.3 %
± 0.05 %
TEMPERATURE COEFFICIENT IN THE RANGE - 55 °C TO + 200 °C
OHMIC RANGE
REQUIREMENTS
NF C 83-210 MIL-R-26E
MIL
≤
± 100 ppm/°C
± 50 ppm/°C
1
≤
Rn < 10
Rn
≥
10
≤
± 50 ppm/°C
≤
± 25 ppm/°C
TYPICAL VALUES
SFERNICE
Rn < 1
+ 0 to - 20 ppm/°C
STABILITY AND POWER RATING
Stability changes slightly according to power rating and ambient temperature. This fact is specially important for users needing
a life drift lower than the initial resistance tolerance. Typical drifts, after 2000 h life test made under the 90’/30’ conditions and at
a 25 °C ambient temperature are:
MODEL
STYLE
Pn
1/2 Pn
RMBS
0.5
0.5 W
0.25 W
RMBS
1
1W
0.5 W
RMBS
2
2W
1W
R%
R%
0.15 %
0.075 %
MODEL
STYLE
P max.
Pn
1/3 Pn
RMB
0.75
1W
0.75 W
0.4 W
RMB
1.5
2W
1.5 W
0.75 W
RMB
3
3.5 W
3W
1.5 W
R%
R%
1%
0.5 %
0.3 %
Document Number: 50010
Revision: 21-Jan-08
For technical questions, contact: sfer@vishay.com
www.vishay.com
45
RMB, RMBS
Vishay Sfernice
POWER RATING CHART
125
Molded Precision Wirewound Resistors
Axial Leads
100
%
RATED POWER
75
50
37
25
0
0
50
100
150
200
250 275 300
350
AMBIENT TEMPERATURE IN DEGREES CELSIUS
TEMPERATURE RISE
250
HOT SPOT TEMPERATURE IN °C
BS
1
B
3
BS
RM
RM
RM
BS
0.
5
2
200
5
RM
B
5
1.
0.
7
100
50
0
0
1
2
RATED POWER IN WATTS
RM
150
B
RM
3
MARKING
SFERNICE trademark, model, style, CECC style (if applicable) nominal resistance (in
Ω),
tolerance (in %), manufacturing date.
ORDERING INFORMATION
RMB
RMBS
MODEL
1.5
0.5
STYLE
NON
INDUCTIVE
WINDING
“Ni” Optional
SPECIAL
DESIGN
Method N°
Optional
U5
22U
OHMIC VALUE
Custom items
are subject to
extra-charge
and min. order.
Please see price
list.
5%
5%
TOLERANCE
BA100NA
BA100
PACKAGING
Optional
e3 (e1: RMB3)
e1 (e3: RMBS 0.5 < 1 R
RMBS 1 < 3.52 R)
LEAD (Pb)-FREE
SAP PART NUMBERING GUIDELINES
RMB
RMBS
MODEL
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46
105
05
STYLE
R5000
22R00
OHMIC VALUE
J
J
TOLERANCE
S00
S14
PACKAGING
Document Number: 50010
Revision: 21-Jan-08
For technical questions, contact: sfer@vishay.com
Legal Disclaimer Notice
Vishay
Disclaimer
All product specifications and data are subject to change without notice.
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 herein
or in any other disclosure relating to any product.
Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any
information provided herein to the maximum extent permitted by law. The product specifications do not expand or
otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed
therein, which apply to these products.
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.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless
otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such
applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting
from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding
products designed for such applications.
Product names and markings noted herein may be trademarks of their respective owners.
Document Number: 91000
Revision: 18-Jul-08
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1
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