RS, NS
Vishay Dale
www.vishay.com
116 Document Number 30204
Revision 10-Jun-02
For technical questions, contact ww2bresistors@vishay.com
FEATURES
• High temperature coating
• Complete welded construction
• Meets applicable requirements of MIL-PRF-26
• Available in non-inductive styles (type NS) with
Aryton-Perry winding for lowest reactive components
• Excellent stability in operation
Wirewound Resistors, Military, MIL-PRF-26 Qualified,
Type RW, Precision Power, Silicone Coated
PARAMETER UNIT RS RESISTOR CHARACTERISTICS
Temperature Coefficient ppm/°C± 90 for below 1Ω, ± 50 for 1Ω to 9.9Ω, ± 20 for 10Ω and above
Dielectric Withstanding Voltage VAC 500 minimum for RS-1/8 thru RS-1A, 1000 minimum for all others
Short Time Overload – 5 x rated power for 5 seconds for 3.75 watt size and smaller,
10 x rated power for 5 seconds for 4 watt size and greater
Maximum Working Voltage V (P x R)1/2
Insulation Resistance Ω1000 Megohm minimum dry, 100 Megohm minimum after moisture test
Terminal Strength lb 5 minimum for RS-1/8 thru RS-1A, 10 minimum for all others
Solderability – MIL-PRF-26 type - Meets requirements of ANSI J-STD-002
Non Mil type - Terminals are 60/40 electro tin plated to facilitate soldering
Operating Temperature Range °C Characterisitic U = - 65/+ 250, Characteristic V = - 65/+ 350
Power Rating – Characteristic U - + 250°C max. hot spot temperature, ± 0.5% max. ∆R in 2000 hr. load life
Characteristic V - + 350°C max. hot spot temperature, ± 3.0% max. ∆R in 2000 hr. load life
TECHNICAL SPECIFICATIONS
ORDERING INFORMATION
RS-1A 10Ω1.0%
MODEL RESISTANCE TOLERANCE
Ω± %
* Standard tolerance for these Mil parts is ± 5% 1Ω and above, ± 10% below 1Ω.
**Standard tolerance for these Mil parts is ± 0.5% & ± 1% for resistance values 0.1Ω and above, ± 0.1% for resistance values 0.499Ω and above.
***Vishay Dale RS models have two power ratings depending on operation temperature and stability requirements.
NOTE: Shaded area indicates most popular models.
STANDARD ELECTRICAL SPECIFICATIONS
RESISTANCE RANGE
MIL. RANGE SHOWN IN BOLD FACE
Ω
UV
± 0.05% thru ± 3% thru ± 0.5%, ± 1%
TYPE ± 5% ± 10% ± 0.05% ± 0.1% ± 0.25% ± 3%, ± 5%
± 10% g
RS-1/8 — .125 — — — — 0.1 - 950 0.15
RS-1/4 — .4 — 1 - 1k 0.499 - 1k 0.499 - 3.4k 0.1 - 3.4k 0.21
RS-1/2 — .75 — 1 - 1.3k 0.499 - 1.3k 0.499 - 4.9k 0.1 - 4.9k 0.23
RS-1A — 1.0 — 1 - 2.74k 0.499 - 2.74k 0.499 - 10.4k 0.1 - 10.4k 0.34
RS-1A-300 1.0 — —0.499 - 2.74k 0.499 - 10.4k 0.1 - 10.4k 0.34
RW70** 1.0 —0.1 - 2.74k
RS-1M — 1.0 — 1 - 1.32k 0.499 - 1.67k 0.499 - 6.85k 0.1 - 6.85k 0.30
RS-2 — 4.0 5.5 0.499 - 12.7k 0.499 - 12.7k 0.1 - 47.1k 0.1 - 47.1k 2.10
RS-2M — 3.0 — 0.499 - 4.49k 0.499 - 4.49k 0.1 - 18.74k 0.1 - 18.74k 0.65
RS-2B — 3.0 3.75 0.499 - 6.5k 0.499 - 6.5k 0.1 - 24.5k 0.1 - 24.5k 0.70
RS-2B-300 3.0 — —0.499 - 6.5k 0.1 - 24.5k 0.1 - 24.5k 0.70
RW79** 3.0 —0.1 - 6.49k
RS-2C — 2.5 3.25 0.499 - 8.6k 0.499 - 8.6k 0.1 - 32.3k 0.1 - 32.3k 1.6
RS-2C-17 — 2.5 3.25 0.499 - 6.8k 0.499 - 8.6k 0.1 - 32.3k 0.1 - 32.3k 1.6
RS-2C-23 — 3.25 ———
0.1 - 32.3k 1.6
RW69* —3.0 0.1 - 2.0k
RS-5 — 5.0 6.5 0.499 - 25.7k 0.499 - 25.7k 0.1 - 95.2k 0.1 - 95.2k 4.2
RS-5-69 5.0 — — 0.499 - 25.7k 0.1 - 95.2k 0.1 - 95.2k 4.2
RW74** 5.0 —0.1 - 24.3k
RS-5-70 — 6.5 ———
0.1 - 95.2k 4.2
RW67* —6.5 0.1 - 8.2k
RS-7 — 7.0 9.0 0.499 - 41.4k 0.499 - 41.4k 0.1 - 154k 0.1 - 154k 4.7
RS-10 — 10.0 13.0 0.499 - 73.4k 0.499 - 73.4k 0.1 - 273k 0.1 - 273k 9.0
RS-10-38 10.0 — —0.499 - 73.4k 0.1 - 273k 0.1 - 273k 9.0
RW78** 10.0 –0.1 - 71.5k
RS-10-39 — 13.0 ———
0.1 - 273k 9.0
RW68* —11.0 0.1 - 20k
POWER RATING***
P25°C
W
WEIGHT
(Typical)
MODEL MIL-PRF-26
www.vishay.com
117
RS, NS
Vishay Dale
Document Number 30204
Revision 10-Jun-02 For technical questions, contact ww2bresistors@vishay.com
DIMENSIONS
Wirewound Resistors, Military, MIL-PRF-26 Qualified,
Type RW, Precision Power, Silicone Coated
MODEL DIMENSIONS in inches [millimeters]
MATERIAL SPECIFICATIONS
Element: Copper-nickel alloy or nickel-chrome alloy,
depending on resistance value
Core: Ceramic, steatite or alumina, depending on physical
size
Coating: Special high temperature silicone
Standard Terminals: Tinned Copperweld®
End Caps: Stainless steel
Deviations for RS-1/8: Thermoset silicone molded
construction, endcaps will be nickel-silver alloy and terminals
will be tinned copper
Part Marking: DALE, Model, Wattage*, Value, Tolerance,
Date Code
C
D
A
1.50
[38.10]*
Min.
B
AB C
D
(Max.)**
RS-1/8 0.155 ± 0.015 — 0.065 ± 0.015 0.020 ± 0.002
[3.94 ± 0.381] [1.65 ± 0.381] [0.508 ± 0.051]
RS-1/4 0.250 ± 0.031 0.281 0.085 ± 0.020 0.020 ± 0.002
[6.35 ± 0.787] [7.14] [2.16 ± 0.508] [0.508 ± 0.051]
RS-1/2 0.312 ± 0.016 0.328 0.078 + 0.016 - 0.031 0.020 ± 0.002
[7.92 ± 0.406] [8.33] [1.98 + 0.406 - 0.787] [0.508 ± 0.051]
RS-1A 0.406 ± 0.031 0.437 0.094 ± 0.031 0.020 ± 0.002
RS-1A-300 [10.31 ± 0.787] [11.10] [2.39 ± 0.787] [0.508 ± 0.051]
RS-1M 0.285 ± 0.025 0.311 0.110 ± 0.015 0.020 ± 0.002
[7.24 ± 0.635] [7.90] [2.79 ± 0.381] [0.508 ± 0.051]
RS-2 0.625 ± 0.062 0.765 0.250 ± 0.031 0.040 ± 0.002
[15.88 ± 1.57] [19.43] [6.35 ± 0.787] [1.02 ± 0.051]
RS-2M 0.500 ± 0.062 0.562 0.185 ± 0.015 0.032 ± 0.002
[12.70 ± 1.57] [14.27] [4.70 ± 0.381] [0.813 ± 0.051]
RS-2B 0.560 ± 0.062 0.622 0.187 ± 0.031 0.032 ± 0.002
RS-2B-300 [14.22 ± 1.57] [15.80] [4.75 ± 0.787] [0.813 ± 0.051]
RS-2C 0.500 ± 0.062 0.593 0.218 ± 0.031 0.040 ± 0.002
[12.70 ± 1.57] [15.06] [5.54 ± 0.787] [1.02 ± 0.051]
RS-2C-17 0.500 ± 0.062 0.593 0.218 ± 0.031 0.032 ± 0.002
[12.70 ± 1.57] [15.06] [5.54 ± 0.787] [0.813 ± 0.051]
RS-2C-23 0.500 ± 0.062 0.593 0.218 ± 0.031 0.032 ± 0.002
[12.70 ± 1.57] [15.06] [5.54 ± 0.787] [0.813 ± 0.051]
RS-5 0.875 ± 0.062 1.0 0.312 ± 0.031 0.040 ± 0.002
[22.23 ± 1.57] [25.4] [7.92 ± 0.787] [1.02 ± 0.051]
RS-5-69 0.875 ± 0.062 0.937 0.312 ± 0.031 0.040 ± 0.002
[22.23 ± 1.57] [23.80] [7.92 ± 0.787] [1.02 ± 0.051]
RS-5-70 0.875 ± 0.062 1.0 0.312 ± 0.031 0.040 ± 0.002
[22.23 ± 1.57] [25.4] [7.92 ± 0.787] [1.02 ± 0.051]
RS-7 1.22 ± 0.062 1.28 0.312 ± 0.031 0.040 ± 0.002
[30.99 ± 1.57] [32.51] [7.92 ± 7.87] [1.02 ± 0.051]
RS-10 1.78 ± 0.062 1.87 0.375 ± 0.031 0.040 ± 0.002
[45.21 ± 1.57] [47.50] [9.53 ± 0.787] [1.02 ± 0.051]
RS-10-38 1.78 ± 0.062 1.84 0.375 ± 0.031 0.040 ± 0.002
[45.21 ± 1.57] [46.74] [9.53 ± 0.787] [1.02 ± 0.051]
RS-10-39 1.78 ± 0.062 1.87 0.375 ± 0.031 0.040 ± 0.002
[45.21 ± 1.57] [47.50] [9.53 ± 0.787] [1.02 ± 0.051]
*On some standard reel pack methods, the leads may be trimmed to
a shorter length than shown.
NOTE: RS-1/8 terminal length will be 1.0" [25.4mm] minimum.
**B (Max.) dimension is clean lead to clean lead.
NS NON-INDUCTIVE
Models of equivalent physical and electrical specifications are
available with non-inductive (Aryton-Perry) winding. They are
identified by substituting the letter N for R in the model
number (NS-5, for example). Two conditions apply:
1. For NS models, divide maximum resistance values by two
2. Body O.D. on NS-2C may exceed that of the RS-2C by 010"
*All ∆R figures shown are maximum, based upon testing requirements per MIL-PRF-26.
PERFORMANCE*
TEST CONDITIONS OF TEST TEST LIMITS
Characteristic U Characteristic V
Thermal Shock Rated power applied until thermally stable, then a min. of 15 minutes at - 55°C± (0.2% + 0.05Ω) ∆R± (2.0% + 0.05Ω) ∆R
Short Time Overload
5 x rated power (3.75 watt and smaller), 10 x rated power (4 watt and larger) for 5 seconds
± (0.2% + 0.05Ω) ∆R± (2.0% + 0.05Ω) ∆R
Dielectric Withstanding Voltage 500 minimum for RS-1/8 thru RS-1A, 1000 for all others, duration of 1 minute ± (0.1% + 0.05Ω) ∆R± (0.1% + 0.05Ω) ∆R
Low Temperature Storage - 65°C for 24 hours ± (0.2% + 0.05Ω) ∆R± (2.0% + 0.05Ω) ∆R
High Temperature Exposure 250 hours at: U = + 250°C, V = + 350°C± (0.5% + 0.05Ω) ∆R± (2.0% + 0.05Ω) ∆R
Moisture Resistance MIL-STD-202 Method 106, 7b not applicable ± (0.2% + 0.05Ω) ∆R± (2.0% + 0.05Ω) ∆R
Shock, Specified Pulse MIL-STD-202 Method 213, 100g's for 6 milliseconds, 10 shocks ± (0.1% + 0.05Ω) ∆R± (0.2% + 0.05Ω) ∆R
Vibration, High Frequency Frequency varied 10 to 2000Hz, 20g peak, 2 directions 6 hours each ± (0.1% + 0.05Ω) ∆R± (0.2% + 0.05Ω) ∆R
Load Life 2000 hours at rated power, + 25°C, 1.5 hours “ON”, 0.5 hours “OFF” ± (0.5% + 0.05Ω) ∆R± (3.0% + 0.05Ω) ∆R
5 to 10 sec., 5 or 10 lb pull test (depending on size),
torsion test - 3 alternating directions, 360° each
Terminal Strength ± (0.1% + 0.05Ω) ∆R± (1.0% + 0.05Ω) ∆R
*Wattage marked on part will be "U" characteristic
Derating
120
100
80
60
40
20
0
-65 -50 0 50 150 250 350
AMBIENT TEMPERATURE IN °C
RATED POWER IN %
CHAR. V
CHAR. U
25
