ESS, ESW, ESN, EGS, EGW, EGN
Vishay Dale
www.vishay.com
126 Document Number 30203
Revision 23-Sep-02
For technical questions, contact ww2bresistors@vishay.com
Wirewound Resistors, Military/Established Reliability
MIL-PRF-39007 Qualified, Type RWR, R Level
FEATURES
• High temperature silicone coated
• Complete welded construction
•Qualified to MIL-PRF-39007
•Available in non-inductive styles (types ESN and EGN) with
Aryton-Perry winding for lowest reactive components
• “S” level failure rate available
ORDERING INFORMATION
M
FAILURE
RATE
RWR74
MILITARY
TYPE
S
TERMINAL WIRE
AND WINDING
49R9
RESISTANCE
F
TOLERANCE
STANDARD ELECTRICAL SPECIFICATIONS
MIL-PRF-39007 POWER RATING WEIGHT
P25°C(Typical)
MODEL TYPE W ± 0.1% ± 0.5 & ± 1% g
EGS-1-80 RWR81S 1 0.499 - 1k 0.1 - 1k 0.21
EGW-1 RWR81W 1 0.499 - 1k 0.1 - 1k 0.21
EGN-1-80 RWR81N 1 0.499 - 499 0.1 - 499 0.21
EGN-1-10 RWR81Z 1 0.499 - 499 0.1 - 499 0.21
EGS-2 RWR82S 1.5 0.499 - 1.3k 0.1 - 1.3k 0.23
EGW-2 RWR82W 1.5 0.499 - 1.3k 0.1 - 1.3k 0.23
EGN-2 RWR82N 1.5 0.499 - 649 0.1 - 649 0.23
EGN-2-10 RWR82Z 1.5 0.499 - 649 0.1 - 649 0.23
EGS-3-80 RWR80S 2 0.499 - 3.16k 0.1 - 3.16k 0.34
EGW-3 RWR80W 2 0.499 - 3.16k 0.1 - 3.16k 0.34
EGN-3-80 RWR80N 2 0.499 - 1.58k 0.1 - 1.58k 0.34
EGN-3-10 RWR80Z 2 0.499 - 1.58k 0.1 - 1.58k 0.34
ESS-2A RWR71S 2 0.499 - 12.1k 0.1 - 12.1k 0.90
ESW-2A RWR71W 2 0.499 - 12.1k 0.1 - 12.1k 0.90
ESN-2A RWR71N 2 0.499 - 6.04k 0.1 - 6.04k 0.90
ESN-2A-10 RWR71Z 2 0.499- 6.04k 0.1 - 6.04k 0.90
ESS-2B RWR89S 3 0.499 - 4.12k 0.1 - 4.12k 0.70
ESW-2B RWR89W 3 0.499 - 4.12k 0.1 - 4.12k 0.70
ESN-2B RWR89N 3 0.499 - 2.05k 0.1 - 2.05k 0.70
ESN-2B-10 RWR89Z 3 0.499 - 2.05k 0.1 - 2.05k 0.70
ESS-5 RWR74S 5 0.499 - 12.1k 0.1 - 12.1k 4.2
ESW-5 RWR74W 5 0.499 - 12.1k 0.1 - 12.1k 4.2
ESN-5 RWR74N 5 0.499 - 6.04k 0.1 - 6.04k 4.2
ESN-5-10 RWR74Z 5 0.499 - 6.04k 0.1 - 6.04k 4.2
EGS-10-80 RWR84S 7 0.499 - 12.4k 0.1 - 12.4k 3.6
EGW-10 RWR84W 7 0.499 - 12.4k 0.1 - 12.4k 3.6
EGN-10-80 RWR84N 7 0.499- 6.19k 0.1 - 6.19k 3.6
EGN-10-10 RWR84Z 7 0.499- 6.19k 0.1 - 6.19k 3.6
ESS-10 RWR78S 10 0.499 - 39.2k 0.1 - 39.2k 9.0
ESW-10 RWR78W 10 0.499 - 39.2k 0.1 - 39.2k 9.0
ESN-10 RWR78N 10 0.499- 19.6k 0.1 - 19.6k 9.0
ESN-10-10 RWR78Z 10 0.499- 19.6k 0.1 - 19.6k 9.0
MILITARY RANGE
Ω
www.vishay.com
127
ESS, ESW, ESN, EGS, EGW, EGN
Vishay Dale
Document Number 30203
Revision 23-Sep-02 For technical questions, contact ww2bresistors@vishay.com
DIMENSIONS
B
1.50 [38.10]*
Min.
A
C
MIL-PRF-39007
DIMENSIONS - in inches [millimeters]
MODEL A B C
RWR81 0.250 ± 0.031 .085 ± 0.020 0.020 ± 0.0015
[6.35 ± 0.787] [2.16 ± 0.508] [0.508 ± 0.038]
RWR82 0.312 ± 0.016 0.078 + 0.016 - 0.031 0.020 ± 0.0015
[7.92 ± 0.406] [1.98 + 0.406 - 0.787] [0.508 ± 0.038]
RWR80 0.406 ± 0.031 0.094 ± 0.031 0.020 ± 0.0015
[10.31 ± 0.787] [2.39 ± 0.787] [0.508 ± 0.038]
RWR71 0.812 ± 0.062 0.187 ± 0.031 0.032 ± 0.002
[20.62 ± 1.58] [4.75 ± 0.787] [0.813 ± 0.051]
RWR89 0.560 ± 0.062 0.187 ± 0.031 0.032 ± 0.002
[14.22 ± 1.58] [4.75 ± 0.787] [0.813 ± 0.051]
RWR74 0.875 ± 0.062 0.312 ± 0.031 0.040 ± 0.002
[22.23 ± 1.58] [7.92 ± 0.787] [1.02 ± 0.051]
RWR84 0.875 ± 0.062 0.312 ± 0.031 0.040 ± 0.002
[22.23 ± 1.58] [7.92 ± 0.787] [1.02 ± 0.051]
RWR78 1.780 ± 0.062 0.375 ± 0.031 0.040 ± 0.002
[45.21 ± 1.58] [9.53 ± 0.787] [1.02 ± 0.051]
MATERIAL SPECIFICATIONS
Element: Copper-nickel alloy or nickel-chrome alloy,
depending on resistance value
Core: Ceramic, Beryllium oxide, steatite or alumina,
depending on power requirement
Coating: Special high temperature silicone
Terminal and Winding: The terminal and the winding
are identified by a letter symbol in the military type
designation. Military Symbol:
S = Solderable, inductively wound
W = Weldable, inductively wound
N = Solderable, non-inductively wound
Z = Weldable, non-inductively wound
Terminals: Solderable - Tinned Copperweld®
Weldable - Bare Nickel per MIL-STD-1276, Type N-1
End Caps: Stainless Steel
Part Marking: Source Code, JAN, Military PIN,
Date/Lot Code
APPLICABLE MIL-SPECIFICATION
MIL-PRF-39007: This is the military specification
covering axial lead established reliability power
wirewound resistors.
Vishay Dale ESS, ESW, EGS, EGW, ESN and EGN
resistors meet or exceed the electrical, environmental
and dimensional requirements of this specification.
PERFORMANCE
TEST CONDITIONS OF TEST TEST LIMITS
Thermal Shock MIL-STD-2.2, Method 303 ± (0.2% + 0.005Ω) ∆R
Short Time Overload
5 x rated power (RWR71, 80, 81, 89, 82), 10 x rated power (RWR74, 78, 84) for 5 seconds
± (0.2% + 0.005Ω) ∆R
Dielectric Withstanding Voltage 500Vrms (RWR80, 81, 82), 1000Vrms (RWR71, 74, 78, 84, 89), 1 minute duration ± (0.1% + 0.005Ω) ∆R
Low Temperature Storage - 65°C for 24 hours ± (0.1% + 0.005Ω) ∆R
High Temperature Exposure 250°C for 2000 hours ± (1.0% + 0.005Ω) ∆R*
Moisture Resistance MIL-STD-202, Method 106 ± (0.2% + 0.005Ω) ∆R
Shock, Specified Pulse MIL-STD-202, Method 205, Condition C ± (0.1% + 0.005Ω) ∆R
Vibration, High Frequency MIL-STD-202, Method 204, Condition D ± (0.1% + 0.005Ω) ∆R
Load Life 2000 hours at rated power, + 25°C, 1.5 hours “ON”, 0.5 hours “OFF” ± (0.5% + 0.005Ω) ∆R
Extended Life 10,000 hours at rated power, + 25°C, 1.5 hours “ON”, 0.5 hours “OFF” ± (1.0% + 0.005Ω) ∆R
MIL-STD-202, Method 211, Condition A and C
5 pound (RWR80, 81, 82), 10 pound (RWR71, 74, 78, 84, 89)
TECHNICAL SPECIFICATIONS
PARAMETER UNIT ESS, ESW, ESN, EGS, EGW, EGN RESISTOR CHARACTERISTICS
Temperature Coefficient ppm/°C± 650 for 0.1Ω to 0.499Ω, ± 400 for 0.505Ω to 1Ω, ± 50 for 1.1Ω to 10Ω, ± 20 for 10Ω and above
Dielectric Withstanding Voltage V
AC
500 minimum for 2 watt and smaller, 1000 minimum for 3 watt and larger
Short Time Overload - 5 x rated power for 5 seconds for 3 watt size and smaller,
10 x rated power for 5 seconds for 5 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 2 watt and smaller, 10 minimum for 3 watt and larger
Solderability - Meets requirements of ANSI J-STD-002
Operating Temperature Range °C - 65/+ 250
Wirewound Resistors, Military/Established Reliability
MIL-PRF-39007 Qualified, Type RWR, R Level
*For resistance values above 100 ohms, Test Limit is ± 1.0%.
Terminal Strength ± (0.1% + 0.005Ω) ∆R
*On some standard reel pack methods, the leads may be
trimmed to a shorter length than shown.
Derating
-65-50 0 50 150 250
AMBIENT TEMPERATURE IN °C
RATED POWER IN %
25
0
20
40
60
80
100
120
