Molded Precision Wirewound Resistors
Axial Leads
www.vishay.com For technical questions, contact: sfer@vishay.com Document Number: 50010
44 Revision: 21-Jan-08
RMB, RMBS
Vishay Sfernice
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
Undergoes European Quality Insurance System (CECC)
25 min.25 min.
A
Ø B
Ø E
SERIES
AND STYLE
RMB 0.75
RMBS 0.5
RMB 1.5
RMBS 1
RMB 3
RMBS 2
A max. 7 10.2 16.2
Ø B max. 2.5 4 6.4
E ± 0.1 0.6 0.6 0.8
Weight in g 0.3 0.7 1.5
TECHNICAL SPECIFICATIONS
VISHAY SFERNICE SERIES AND STYLE RMB 0.75 RMB 1.5 RMB 3 RMBS 0.5 RMBS 1 RMBS 2
NF C 83-210 - - - RP1 RP2 RP3
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
2 k
Ω
0.1
Ω
6.81 k
Ω
0.051
Ω
13 k
Ω
0.1
Ω
2 k
Ω
0.1
Ω
6.81 k
Ω
0.015
Ω
13 k
Ω
± 2 % E48 0.1
Ω
2 k
Ω
0.1
Ω
6.81 k
Ω
0.08
Ω
12.3 k
Ω
0.1
Ω
2 k
Ω
0.1
Ω
6.81 k
Ω
0.078
Ω
12.4 k
Ω
± 1 % E96 0.1
Ω
2 k
Ω
0.1
Ω
6.81 k
Ω
0.1
Ω
12.4 k
Ω
0.1
Ω
2 k
Ω
0.1
Ω
6.81 k
Ω
0.1
Ω
12.4 k
Ω
± 0.5 % E96 0.4
Ω
2 k
Ω
0.4
Ω
6.81 k
Ω
0.3
Ω
12.4 k
Ω
0.4
Ω
2 k
Ω
0.4
Ω
6.81 k
Ω
0.3
Ω
12.4 k
Ω
± 0.1 % Please consult
VISHAY SFERNICE
Qualified Ohmic Range
NF C 83-210 ---
1
Ω
174
Ω
1
Ω
590
Ω
1
Ω
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
RMB, RMBS
Molded Precision Wirewound Resistors
Axial Leads Vishay Sfernice
Document Number: 50010 For technical questions, contact: sfer@vishay.com www.vishay.com
Revision: 21-Jan-08 45
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 % R.H. -± 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 to - 20 ppm/°C
MODEL
STYLE
RMBS
0.5
RMBS
1
RMBS
2
R %
R %
MODEL
STYLE
RMB
0.75
RMB
1.5
RMB
3
R %
R %
Pn 0.5 W 1 W 2 W 0.15 % P max. 1 W 2 W 3.5 W 1 %
1/2 Pn 0.25 W 0.5 W 1 W 0.075 % Pn 0.75 W 1.5 W 3 W 0.5 %
1/3 Pn 0.4 W 0.75 W 1.5 W 0.3 %
www.vishay.com For technical questions, contact: sfer@vishay.com Document Number: 50010
46 Revision: 21-Jan-08
RMB, RMBS
Vishay Sfernice Molded Precision Wirewound Resistors
Axial Leads
POWER RATING CHART
TEMPERATURE RISE
MARKING
SFERNICE trademark, model, style, CECC style (if applicable) nominal resistance (in Ω), tolerance (in %), manufacturing date.
ORDERING INFORMATION
RMB 1.5 U5 5 % BA100NA e3 (e1: RMB3)
RMBS 0.5 22U 5 % BA100 e1 (e3: RMBS 0.5 < 1 R
RMBS 1 < 3.52 R)
MODEL STYLE NON
INDUCTIVE
WINDING
“Ni” Optional
SPECIAL
DESIGN
Method N°
Optional
OHMIC VALUE
Custom items
are subject to
extra-charge
and min. order.
Please see price
list.
TOLERANCE PACKAGING
Optional
LEAD (Pb)-FREE
SAP PART NUMBERING GUIDELINES
RMB 105 R5000 J S00
RMBS 05 22R00 J S14
MODEL STYLE OHMIC VALUE TOLERANCE PACKAGING
AMBIENT TEMPERATURE IN DEGREES CELSIUS
REWOP DETAR %
125
100
75
50
37
25
0
0 50 100 150 200 250 275 300 350
RATED POWER IN WATTS
N I E
R U T A R E P M E T
T O
P S T O
H ° C
250
200
150
100
50
0
0 1 2 3
M R B 5 7
.
0 M R
0 S B .
5
B
M R M R
5 . 1 1 S B
2
S
B
M R
3
B M R
Document Number: 91000 www.vishay.com
Revision: 18-Jul-08 1
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All product specifications and data are subject to change without notice.
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