Document Number: 50010 For technical questions, contact: sfer@vishay.com www.vishay.com
Revision: 16-Feb-10 95
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
•Compliant to RoHS directive 2002/95/EC
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.
Note
• Undergoes European Quality Insurance System (CECC)
DIMENSIONS in millimeters
SERIES
AND
STYLE
A
max.
Ø B
max. E ± 0.1 WEIGHT
g
RMB0.75
RMBS0.5 7 2.5 0.6 0.3
RMB1.5
RMBS1 10.2 4 0.6 0.7
RMB3
RMBS2 16.2 6.4 0.8 1.5
25 min. 25 min.
A
Ø B
Ø E
TECHNICAL SPECIFICATIONS
VISHAY SFERNICE SERIES AND STYLE RMB0.75 RMB1.5 RMB3 RMBS0.5 RMBS1 RMBS 2
NF C 83-210 ---RP1RP2RP3
CECC 40201-005 --- A BC
Power
Rating
at 25 °C 0.75 W 1.5 W 3 W 0.5 W 1 W 2 W
at 70 °C 0.6 W 1.2 W 2.4 W 0.4 W 0.8 W 1.6 W
Ohmic Range
in Relation
to Tolerance
± 5 % E24 0.1
Ω
to
2 k
Ω
0.1
Ω
to
6.81 k
Ω
0.051
Ω
to
13 k
Ω
0.1
Ω
to
2 k
Ω
0.1
Ω
to
6.81 k
Ω
0.015
Ω
to
13 k
Ω
± 2 % E48 0.1
Ω
to
2 k
Ω
0.1
Ω
to
6.81 k
Ω
0.08
Ω
to
12.3 k
Ω
0.1
Ω
to
2 k
Ω
0.1
Ω
to
6.81 k
Ω
0.078
Ω
to
12.4 k
Ω
± 1 % E96 0.1
Ω
to
2 k
Ω
0.1
Ω
to
6.81 k
Ω
0.1
Ω
to
12.4 k
Ω
0.1
Ω
to
2 k
Ω
0.1
Ω
to
6.81 k
Ω
0.1
Ω
to
12.4 k
Ω
± 0.5 % E96 0.4
Ω
to
2 k
Ω
0.4
Ω
to
6.81 k
Ω
0.3
Ω
to
12.4 k
Ω
0.4
Ω
to
2 k
Ω
0.4
Ω
to
6.81 k
Ω
0.3
Ω
to
12.4 k
Ω
± 0.1 % Please consult
Vishay Sfernice
Qualified Ohmic Range
NF C 83-210 ---
1
Ω
to
174
Ω
1
Ω
to
590
Ω
1
Ω
to
1.3 k
Ω
Limiting Element Voltage Not applicable 120 V 200 V Not applicable 120 V 200 V
Critical Resistance Out of nominal ohmic range
www.vishay.com For technical questions, contact: sfer@vishay.com Document Number: 50010
96 Revision: 16-Feb-10
RMB, RMBS
Vishay Sfernice Molded Precision Wirewound Resistors
Axial Leads
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:
PERFORMANCE
TESTS CONDITIONS REQUIREMENTS TYPICAL VALUES AND DRIFTS
MIL-R-26 E NF C 83-210 RMB RMBS
Dielectric W/s Voltage 500 VRMS ± (0.1 % + 0.05 Ω) - ± (0.05 % + 0.01 Ω) ± (0.05 % + 0.01 Ω)
Short Time Overload 5 Pn at 25 °C/5 s ± (0.2 % + 0.05 Ω) ± 0.25 % + 0.05 Ω± (0.1 % + 0.01 Ω) ± (0.05 % + 0.01 Ω)
Climatic Sequence
NF C 83-210
- 55 °C/+ 200 °C
5 cycles
-± 0.25 % + 005 Ω
Insulation R > 100 MΩ
± (0.1 % + 0.01 Ω)
> 104 MΩ
± (0.05 % + 0.01 Ω)
> 104 MΩ
Humidity (Steady State) NF C 83-210
56 days 95 % RH -± 0.25 % + 0.05 Ω
Insulation R > 100 MΩ
± (0.1 % + 0.01 Ω)
> 104 MΩ
± (0.05 % + 0.01 Ω)
> 104 MΩ
Thermal Shock
Load at 100 % P followed
by cold temp. exposure
at - 55 °C
± (0.2 % + 0.05 Ω) - ± (0.2 % + 0.01 Ω) (0.1 % + 0.01 Ω)
Vibration
MIL-STD-202
Method 204 - Test D: 20 g
10/2000 Hz
± (0.2 % + 0.05 Ω) ± 0.25 % + 0.05 Ω± (0.01 % + 0.01 Ω) ± (0.01 % + 0.01 Ω)
Load Life MIL-STD-202
Method 108 Pr 2000 h ± (0.5 % + 0.05 Ω)± 0.25 % + 0.05 Ω
1000 h at 25 °C ± (1 % + 0.01 Ω) ± (0.15 % + 0.01 Ω)
Moisture Resistance MIL-STD-202
Method 106
± (0.2 % + 0.05 Ω)
Insulation resistance
> 100 MΩ
-± (0.1 % + 0.01 Ω)
> 103 MΩ
± (0.05 % + 0.01 Ω)
> 103 MΩ
High Temperature 1000 h at + 200 °C ± (0.5 % + 0.05 Ω)± 0.5 % + 0.05 Ω
Insulation R > 1 GΩ± 1 % ± 0.3 %
Shock MIL-STD-202
100 g Method 205 Test C ± (0.1 % + 0.05 Ω) ± 0.25 % + 0.05 Ω ± 0.05 % ± 0.05 %
TEMPERATURE COEFFICIENT IN THE RANGE - 55 °C TO + 200 °C
OHMIC RANGE REQUIREMENTS
NF C 83-210 MIL-R-26E
TYPICAL VALUES
SFERNICE
MIL
Rn < 1
≤
± 100 ppm/°C ± 50 ppm/°C
1
≤
Rn < 10
≤
± 50 ppm/°C
Rn
≥
10
≤
± 25 ppm/°C + 0 °C to - 20 ppm/°C
MODEL
STYLE
RMBS
0.5
RMBS
1
RMBS
2R %/R % MODEL
STYLE
RMB
0.75
RMB
1.5
RMB
3R %/R %
Pn0.5 W 1 W 2 W 0.15 % Pmax. 1 W 2 W 3.5 W 1 %
1/2 Pn0.25 W 0.5 W 1 W 0.075 % Pn0.75 W 1.5 W 3 W 0.5 %
1/3 Pn0.4 W 0.75 W 1.5 W 0.3 %
RMB, RMBS
Molded Precision Wirewound Resistors
Axial Leads Vishay Sfernice
Document Number: 50010 For technical questions, contact: sfer@vishay.com www.vishay.com
Revision: 16-Feb-10 97
POWER RATING TEMPERATURE RISE
MARKING
Vishay Sfernice trademark, model, style, CECC style (if applicable) nominal resistance (in Ω), tolerance (in %), manufacturing
date.
AMBIENT TEMPERATURE IN °C
125
100
75
50
37
25
0
0 50 100 150 200 250 275 300 350
RATED POWER IN %
RATED POWER IN W
250
200
150
100
50
0 0 1 2 3
HOT SPOT TEMPERATURE IN°C
RMB0.75 RMBS0.5
RMB1.5 RMBS1
RMB3 RMBS2
ORDERING INFORMATION
RMB 105 R5000 J S00
RMBS 05 22R00 J S14
MODEL STYLE OHMIC VALUE TOLERANCE PACKAGING
GLOBAL PART NUMBER INFORMATION
GLOBAL
MODEL SIZE OPTION OHMIC VALUE TOLERANCE PACKAGING SPECIAL
RMB
RMBS
RMB:
075
105
300
RMBS:
05
10
20
N = Non
inductive
winding
The first four digits are
significant figures and the
last digit specifies the
number of zeros to follow.
R designates decimal point.
300R0 = 300 Ω
680R0 = 680 Ω
20301 = 20.3 kΩ
88R88 = 88.88 Ω
...
F = 1 %
J = 5 %
Standard Packaging:
RMB:
Size 075 and 105: S14 = Bag, 100 pieces
Size 300: S09 = Bag, 50 pieces
RMBS:
Size 05 and 10: S14 = Bag, 100 pieces
Size 20: S09 = Bag, 50 pieces
Other packagings available
As applicable
Ex = MEX
05300R0 SB 1M J00R
Document Number: 91000 www.vishay.com
Revision: 18-Jul-08 1
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Vishay
All product specifications and data are subject to change without notice.
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(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.
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