Document Number: 50010
Revision 19-Mar-02
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44
RMB, RMBS
Vishay Sfernice
For technical questions, contact sfer@vishay.com
Moulded Precision Wirewound Resistors
Axial Leads
FEATURES
• 0.75 Watt to 3 Watt at 25°C
• NF C 83-210
• CECC 40201-005
• Low temperature coeffi cient
• Low ohmic values
• Excellent behavior against humidity
• Electrical insulation
• Mechanical strength
• Accurate sizes
RMB 0.75
RMBS 0.5
0.6
7
2.5
SERIES
AND STYLE
A max.
Ø B max.
Ø E ± 0.1
0.3
RMB 1.5
RMBS 1
0.6
10.2
4
0.7
RMB 3
RMBS 2
0.8
16.2
6.4
1.5
Weight in g
VISHAY SFERNICE SERIES AND STYLE
NF C 83-210
CECC 40201-005
at 25°C
at 70°C
± 5% E24
± 2% E48
Power
Rating
Ohmic Range
in Relation
to Tolerance
Qualified Ohmic Range
NF C 83-210
Limiting Element Voltage
Critical Resistance
RMB 0.75
–
–
0.75W
0.6W
0.1Ω
2kΩ
0.1Ω
2kΩ
–
not applicable 120V
out of nominal ohmic range
± 1% E96 0.1Ω
2kΩ
± 0.5% E96 0.4Ω
2kΩ
RMB 1.5
–
–
1.5W
1.2W
0.1Ω
6.81kΩ
0.1Ω
6.81kΩ
–
0.1Ω
6.81kΩ
0.4Ω
6.81kΩ
200V
RMB 3
–
–
3W
2.4W
0.051Ω
13kΩ
0.08Ω
12.3kΩ
–
0.1Ω
12.4kΩ
0.3Ω
12.4kΩ
not applicable
RP1
A
0.5W
0.4W
0.1Ω
2kΩ
0.1Ω
2kΩ
1Ω
174Ω
0.1Ω
2kΩ
0.4Ω
2kΩ
± 0.1% Please consult
VISHAY SFERNICE
RMBS 0.5
120V
RP2
B
1W
0.8W
0.1Ω
6.81kΩ
0.1Ω
6.81kΩ
1Ω
590Ω
0.1Ω
6.81kΩ
0.4Ω
6.81kΩ
RMBS 1
200V
RP3
C
2W
1.6W
0.015Ω
13kΩ
0.078Ω
12.4kΩ
1Ω
1.3kΩ
0.1Ω
12.4kΩ
0.3Ω
12.4kΩ
RMBS 2
Undergoes European Quality Insurance System (CECC)
TECHNICAL SPECIFICATIONS
RMB, RMBS
25 min. 25 min.
A
Ø B
Ø E
High stability and low temperature coeffi cient 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 fi lm 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) specifi cations. 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
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RMB, RMBS
Vishay Sfernice
Document Number: 50010
Revision 19-Mar-02 For technical questions, contact sfer@vishay.com
≤ ± 50ppm/°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 2000h life test made under the 90’/30’ conditions and
at a 25°C ambient temperature are:
OHMIC RANGE REQUIREMENTS
NF C 83-210 MIL-R-26E
≤ ±100ppm/°C
≤ ± 25ppm/°C+ 0 to – 20ppm/°C
TYPICAL VALUES
SFERNICE
± 50ppm/°C
Rn < 1
1 ≤ Rn < 10
Rn ≥ 10
TESTS
Dielectric W/s Voltage
Short Time Overload
Climatic Sequence
Humidity (Steady State)
Thermal Shock
Vibration
Load Life
Moisture Resistance
High Temperature
Shock
700VRMS ± (0.1% + 0.05Ω)–
± 0.25% + 0.05Ω
± 0.25% + 005Ω
I
nsulation R >100MΩ
± 0.25% + 0.05Ω
I
nsulation R > 100MΩ
–
± (0.2% + 0.05Ω)
–
–
± (0.2% + 0.05Ω)
± (0.2% + 0.05Ω)± 0.25% + 0.05Ω
± 0.25% + 0.05Ω
1000h at 25°C
± (0.5% + 0.05Ω)
± (0.2% + 0.05Ω)
Insulation resistance
>100MΩ–
± (0.5% + 0.05Ω)
± (0.1% + 0.05Ω)
± 0.5% + 0.05Ω
Insulation R > 1GΩ
± 0.25% + 0.05Ω
± (0.05% + 0.01Ω)
± (0.1% + 0.01Ω)
± (0.1% + 0.01Ω)
>104MΩ
± (0.1% + 0.01Ω)
>104MΩ
± (0.2% + 0.01Ω)
± (0.01% + 0.01Ω)
± (1% + 0.01Ω)
± (0.1% + 0.01Ω)
>103MΩ
± 1%
± 0.05%
± (0.05% + 0.01Ω)
± (0.05% + 0.01Ω)
± (0.05% + 0.01Ω)
>104MΩ
± (0.05% + 0.01Ω)
>104MΩ
± (0.1% + 0.01Ω)
± (0.01% + 0.01Ω)
± (0.15% + 0.01Ω)
± (0.05% + 0.01Ω)
>103MΩ
± 0.3%
± 0.05%
5Pn at 25°C/5s
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: 20g
10/2000Hz
MIL-STD-202
Method 108 Pr 2000 h
MIL-STD-202
Method 106
1000h at + 200°C
MIL-STD-202
100g Method 205 Test C
CONDITIONS REQUIREMENTS
MIL-R-26 E NF C 83-210 TYPICAL VALUES AND DRIFTS
RMB RMBS
PERFORMANCE
MODEL
STYLE
Pn
1/2 Pn
0.5W
0.25W
1W
0.5W
2W
1W
0.15%
0.075%
P max.
Pn
1/3 Pn
1W
0.75W
0.4W
2W
1.5W
0.75W
3.5W
3W
1.5W
1%
0.5%
0.3%
RMBS
0.5 RMBS
1RMBS
2 R %
R % MODEL
STYLE RMB
0.75 RMB
1.5 RMB
3 R %
R %
TEMPERATURE COEFFICIENT IN THE RANGE - 55° + 200°C
Moulded Precision Wirewound
Axial Leads
Document Number: 50010
Revision 19-Mar-02
www.vishay.com
46
RMB, RMBS
Vishay Sfernice
For technical questions, contact sfer@vishay.com
POWER RATING CHART
AMBIENT TEMPERATURE IN DEGREES CELSIUS
% RATED POWER
125
100
75
50
37
25
0
0 50 100 150 200 250 275 300 350
TEMPERATURE RISE
RATED POWER IN WATTS
HOT SPOT TEMPERATURE IN °C
250
200
150
100
50
0 0 1 2 3
RMB 0.75 RMBS 0.5
RMB 1.5 RMBS 1
RMB 3 RMBS 2
MARKING
SFERNICE trademark, model, style, CECC style (if applicable)
nominal resistance (in Ω), tolerance (in %), manufacturing date.
3
NON INDUCTIVE
WINDING
STYLE SPECIAL
DESIGN
NI
MODEL
RMB or
RMBS
TOLERANCE
± 0.5%
PACKAGING
Optional
Method N°
Optional
Optional
OHMIC VALUE
10kΩ
ORDERING INFORMATION
Custom items are subject to
extra-charge and min. order.
Please see price list.
Moulded Precision Wirewound
Axial Leads
Legal Disclaimer Notice
Vishay
Document Number: 91000 www.vishay.com
Revision: 08-Apr-05 1
Notice
Specifications of the products displayed herein are subject to change without notice. Vishay Intertechnology, Inc.,
or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies.
Information contained herein is intended to provide a product description only. No license, express or implied, by
estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Vishay's
terms and conditions of sale for such products, Vishay assumes no liability whatsoever, and disclaims any express
or implied warranty, relating to sale and/or use of Vishay products including liability or warranties relating to fitness
for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications.
Customers using or selling these products for use in such applications do so at their own risk and agree to fully
indemnify Vishay for any damages resulting from such improper use or sale.
