Wirewound Resistors, Military/Established Reliability
MIL-PRF-39007 Qualified, Type RWR, R Level
ESS, ESN, EGS, EGN
Vishay Dale
www.vishay.com For technical questions, contact: ww2bresistors@vishay.com document number: 30203
158 Revision: 22-Oct-08
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
•Note: “Terminal Wire and Winding” type “W” and “Z” are
not listed below but are available upon request. Please
reference MIL-PRF-39007 QPL for approved “failure rate”
and “resistance tolerance/ranges”
Note
(1) Note that “W” and “Z” are not listed above but are available, see MIL-PRF-39007 QPL for available resistance values
STANDARD ELECTRICAL SPECIFICATIONS
MODEL MIL-PRF-39007
TYPE
POWER RATING
P25 °C W
MILITARY RESISTANCE RANGE ΩWEIGHT
(typical) g
± 0.1 % ± 0.5 % and ± 1 %
EGS-1-80 RWR81S 1 0.499 - 1K 0.1 - 1K 0.21
EGN-1-80 RWR81N 1 0.499 - 499 0.1 - 499 0.21
EGS-2 RWR82S 2 0.499 - 1.3K 0.1 - 1.3K 0.23
EGN-2 RWR82N 2 0.499 - 649 0.1 - 649 0.23
EGS-3-80 RWR80S 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
ESS-2A RWR71S 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
ESS-2B RWR89S 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
ESS-5 RWR74S 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
EGS-10-80 RWR84S 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
ESS-10 RWR78S 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
GLOBAL PART NUMBER INFORMATION
Global/Military Part Numbering: RWR74S49R9FSB12
MIL TYPE TERMINAL WIRE
AND WINDING RESISTANCE VALUE TOLERANCE
CODE FAILURE RATE PACKAGING CODE
RWR71
RWR74
RWR78
RWR80
RWR81
RWR82
RWR84
RWR89
S = Solderable, inductive
N = Solderable, noninductive
W = Weldable, inductive (1)
Z = Weldable, noninductive (1)
3 digit significant figure,
followed by a multiplier
49R9 = 49.9 Ω
1000 = 100 Ω
1001 = 1000 Ω
B = ± 0.1 %
D = ± 0.5 %
F = ± 1.0 %
M = 1.0 %/1000 h
P = 0.1 %/1000 h
R = 0.01 %/1000 h
S = 0.001 %/1000 h
B12 = Bulk pack
S70 = Tape/reel
(smaller than 5 W)
S73 = Tape/reel
(5 W and higher)
BSL = Bulk pack,
single lot date code
RSL = Tape/reel,
single lot date code
74S4 R9F9WR SB1R 2
document number: 30203 For technical questions, contact: ww2bresistors@vishay.com www.vishay.com
Revision: 22-Oct-08 159
ESS, ESN, EGS, EGN
Wirewound Resistors, Military/Established Reliability
MIL-PRF-39007 Qualified, Type RWR, R Level Vishay Dale
DIMENSIONS in inches [millimeters]
Note
(1) On some standard reel pack methods, the leads may be trimmed
to a shorter length than shown
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.
Note
• For resistance values above 100 Ω, test limit is ± 1.0 %
B
1.50 [38.10] (1)
min.
A
C
MIL-PRF-39007 DIMENSIONS
in inches [millimeters]
MODEL A B C
RWR81
0.250 ± 0.031
[6.35 ± 0.787]
0.085 ± 0.020
[2.16 ± 0.508]
0.020 ± 0.0015
[0.508 ± 0.038]
RWR82
0.312 ± 0.016
[7.92 ± 0.406]
0.078 + 0.016 - 0.031
[1.98 + 0.406 - 0.787]
0.020 ± 0.0015
[0.508 ± 0.038]
RWR80
0.406 ± 0.031
[10.31 ± 0.787]
0.094 ± 0.031
[2.39 ± 0.787]
0.020 ± 0.0015
[0.508 ± 0.038]
RWR71
0.812 ± 0.062
[20.62 ± 1.58]
0.187 ± 0.031
[4.75 ± 0.787]
0.032 ± 0.002
[0.813 ± 0.051]
RWR89
0.560 ± 0.062
[14.22 ± 1.58]
0.187 ± 0.031
[4.75 ± 0.787]
0.032 ± 0.002
[0.813 ± 0.051]
RWR74
0.875 ± 0.062
[22.23 ± 1.58]
0.312 ± 0.031
[7.92 ± 0.787]
0.040 ± 0.002
[1.02 ± 0.051]
RWR84
0.875 ± 0.062
[22.23 ± 1.58]
0.312 ± 0.031
[7.92 ± 0.787]
0.040 ± 0.002
[1.02 ± 0.051]
RWR78
1.780 ± 0.062
[45.21 ± 1.58]
0.312 ± 0.031
[7.92 ± 0.787]
0.040 ± 0.002
[1.02 ± 0.051]
Derating AMBIENT TEMPERATURE IN °C
RATED POWER IN %
25
0
20
40
60
80
100
120
- 65 - 50 0 50 150 250
TECHNICAL SPECIFICATIONS
PARAMETER UNIT RWR RESISTOR CHARACTERISTICS
Temperature Coefficient ppm/°C ± 650 for 0.1 Ω to 0.499 Ω, ± 400 for 0.505 Ω to 1 Ω, ± 50 for 1.1 Ω to 10 Ω, ± 20 for 10 Ω and above
Dielectric Withstanding Voltage VAC 500 minimum for 2 W and smaller, 1000 minimum for 3 W and larger
Short Time Overload - 5 x rated power for 5 s for 3 W size and smaller,
10 x rated power for 5 s for 5 W size and greater
Maximum Working Voltage V (P x R)1/2
Insulation Resistance . 1000 MΩ minimum dry, 100 MΩ minimum after moisture test
Terminal Strength lb 5 minimum for 2 W and smaller, 10 minimum for 3 W and larger
Solderability - Meets requirements of ANSI J-STD-002
Operating Temperature Range °C - 65 to + 250
PERFORMANCE
TEST CONDITIONS OF TEST TEST LIMITS
Thermal Shock
MIL-STD-2.2, Method 303
± (0.2 % + 0.005
Ω
)
Δ
R
Short Time Overload
5 x rated power (RWR71, 80, 81, 89, 82), 10 x rated power (RWR74, 78, 84) for 5 s
± (0.2 % + 0.005
Ω
)
Δ
R
Dielectric Withstanding
Voltage
500 Vrms (RWR80, 81, 82), 1000 Vrms (RWR71, 74, 78, 84, 89),
1 min duration
± (0.1 % + 0.005
Ω
)
Δ
R
Low Temperature Storage
- 65 °C for 24 h
± (0.1 % + 0.005
Ω
)
Δ
R
High Temperature Exposure
250 °C for 2000 h
± (1.0 % + 0.005
Ω
)
Δ
R
Moisture Resistance
MIL-STD-202, Method 106
± (0.2 % + 0.005
Ω
)
Δ
R
Shock, Specified Pulse
MIL-STD-202, Method 205, condition C
± (0.1 % + 0.005
Ω
)
Δ
R
Vibration, High Frequency
MIL-STD-202, Method 204, condition D
± (0.1 % + 0.005
Ω
)
Δ
R
Load Life
2000 h at rated power, + 25 °C, 1.5 h “ON”, 0.5 h “OFF”
± (0.5 % + 0.005
Ω
)
Δ
R
Extended Life
10 000 h at rated power, + 25 °C, 1.5 h “ON”, 0.5 h “OFF”
± (1.0 % + 0.005
Ω
)
Δ
R
Terminal Strength
MIL-STD-202, Method 211, condition A and C
5 pound (RWR80, 81, 82), 10 pound (RWR71, 74, 78, 84, 89)
± (0.1 % + 0.005
Ω
)
Δ
R
Document Number: 91000 www.vishay.com
Revision: 18-Jul-08 1
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