ERH, ENH
Vishay Dale
Wirewound Resistors, Military/Established Reliability
MIL-PRF-39009 Qualified, Type RER, R Level
FEATURES
• Aluminum heat sink housing
• Molded construction for total environmental protection
• Qualified to MIL-PRF-39009
• Complete welded construction
• Available in non-inductive styles (type ENH) with Aryton-
Perry winding for lowest reactive components
• Mounts on chassis to utilize heat-sink effect
STANDARD ELECTRICAL SPECIFICATIONS
MODEL
MIL-PRF-39009
TYPE
MOUNTED
ENH-5
ENH-10
ENH-25
ENH-50
ERH-5
ERH-10
ERH-25
ERH-50
RER40
RER45
RER50
RER55
RER60
RER65
RER70
RER75
5
10
20
30
5
10
20
30
FREE AIR
3
6
8
10
3
6
8
10
POWER RATING
P
25
°
C
W
MILITARY
RESISTANCE RANGE
±
1%
WEIGHT
(Typical)
g
3.3
8.8
16.5
35
3
6
13
28
Ω
1 - 1.65k
1 - 2.8k
1 - 6.04k
1 - 4.99k
0.10 - 3.32k
0.10 - 5.62k
0.10 - 12.1k
0.10 - 39.2k
TECHNICAL SPECIFICATIONS
PARAMETER
Temperature Coefficient
Dielectric Withstanding Voltage
Short Time Overload
Maximum Working Voltage
Insulation Resistance
Terminal Strength
Solderability
Operating Temperature Range
UNIT
ppm/°C
V
AC
-
V
Ω
lb
-
°C
ERH, ENH RESISTOR CHARACTERISTICS
±
100 for 0.1Ω to 0.99Ω,
±
50 for 1Ω to 19.9Ω,
±
20 for 20Ω and above
1000 for ERH-5 ERH-10 and ERH-25, 2000 for ERH-50
5 x rated power for 5 seconds
(P x R)
1/2
10,000 Megohm minimum dry, 1000 Megohm minimum after moisture test
5 pull for ERH-5 and ERH-10, 10 pull for ERH-25 and ERH-50
Meets requirements of ANSI J-STD-002
- 55/+ 250
ORDERING INFORMATION
RER50
MILITARY
TYPE
F
TOLERANCE
49R9
RESISTANCE
R
FAILURE
RATE
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For technical questions, contact ww2bresistors@vishay.com
Document Number 30200
Revision 18-Oct-00
ERH, ENH
Wirewound Resistors, Military/Established, Reliability
DIMENSIONS
D
C
A
F
M
N
E
H
J
P
K
L
G
Vishay Dale
B
MODEL
ERH-5
ENH-5
ERH-10
ENH-10
ERH-25
ENH-25
ERH-50
ENH-50
A
0.444
±
0.005
[11.280
±
0.127]
0.562
±
0.005
[14.270
±
0.127]
0.719
±
0.005
[18.260
±
0.127]
1.562
±
0.005
[39.670
±
0.127]
B
0.490
±
0.005
[12.450
±
0.127]
0.625
±
0.005
[15.880
±
0.127]
0.781
±
0.005
[19.840
±
0.127]
0.844
±
0.005
[21.440
±
0.127]
C
0.600
±
0.031
[15.240
±
0.787]
0.750
±
0.031
[19.050
±
0.787]
1.062
±
0.031
[26.970
±
0.787]
1.968
±
0.031
[49.990
±
0.787]
D
1.125
±
0.062
[28.580
±
1.570]
1.375
±
0.062
[34.930
±
1.570]
1.938
±
0.062
[49.230
±
1.570]
2.781
±
0.062
[70.640
±
1.570]
E
0.334
±
0.015
[8.480
±
0.381]
0.420
±
0.015
[10.670
±
0.381]
0.550
±
0.015
[13.970
±
0.381]
0.630
±
0.015
[16.000
±
0.381]
DIMENSIONS
in inches [millimeters]
F
0.646
±
0.015
[16.410
±
0.381]
0.800
±
0.015
[20.320
±
0.381]
1.080
±
0.015
[27.430
±
0.381]
1.140
±
0.015
[28.960
±
0.381]
G
0.320
±
0.015
[8.130
±
0.381]
0.390
±
0.015
[9.910
±
0.381]
0.546
±
0.015
[13.870
±
0.381]
0.610
±
0.015
[15.490
±
0.381]
H
0.065
±
0.010
[1.650
±
0.254]
0.075
±
0.010
[1.900
±
0.254]
0.075
±
0.010
[1.900
±
0.254]
0.088
±
0.010
[2.240
±
0.254]
120
100
80
60
40
20
0
-55 -50
0
25
50
150
250
J
0.133
±
0.010
[3.380
±
0.254]
0.165
±
0.010
[4.190
±
0.254]
0.231
±
0.010
[5.870
±
0.254]
0.260
±
0.010
[6.600
±
0.254]
K
0.078
±
0.010
[1.980
±
0.254]
0.093
±
0.010
[2.360
±
0.254]
0.172
±
0.010
[4.370
±
0.254]
0.196
±
0.010
[4.980
±
0.254]
L
0.093
±
0.005
[2.360
±
0.127]
0.094
±
0.005
[2.390
±
0.127]
0.125
±
0.005
[3.180
±
0.127]
0.125
±
0.005
[3.180
±
0.127]
M
0.078
±
0.015
[1.980
±
0.381]
0.102
±
0.015
[2.590
±
0.381]
0.115
±
0.015
[2.920
±
0.381]
0.107
±
0.015
[2.720
±
0.381]
N
0.050
±
0.005
[1.270
±
0.127]
0.085
±
0.005
[2.160
±
0.127]
0.085
±
0.005
[2.160
±
0.127]
0.085
±
0.005
[2.160
±
0.127]
P
0.266
±
0.062
[6.760
±
1.570]
0.312
±
0.062
[7.920
±
1.570]
0.438
±
0.062
[11.130
±
1.570]
0.438
±
0.062
[11.130
±
1.570]
MATERIAL SPECIFICATIONS
Element:
Copper-nickel alloy or nickel-chrome alloy,
depending on resistance value
Core:
Ceramic, steatite or alumina, depending on
physical size
Encapsulant:
Silicone molded construction
Housing:
Aluminum with hard anodic coating
End Caps:
Stainless steel
Standard Terminals:
Tinned Copperweld
®
Part Marking:
Source Code, JAN, Military PIN,
Date/Lot Code
APPLICABLE MIL SPECIFICATION
MIL-PRF-39009:
This is the military specification covering
housed chassis mount established reliability power
wirewound resistors. Vishay ERH and ENH resistors are
listed as qualified on the MIL-PRF-39009 QPL.
Derating
POWER RATING
AMBIENT TEMPERATURE IN
°
C
Vishay ERH and ENH resistor wattage ratings are based on
mounting to the proper heat sink.
ERH-5 and ERH-10: 4" x 6" x 2" x 0.040" thick aluminum chassis
ERH-25 and ERH-50: 5" x7" x 2" x 0.040" thick aluminum chassis
PERFORMANCE
TEST
Low Temperature Operation
Short Time Overload
Dielectric Withstanding Voltage
Low Temperature Storage
High Temperature Exposure
Moisture Resistance
Shock, Specified Pulse
Vibration, High Frequency
Load Life
Extended Life
Terminal Strength
CONDITIONS OF TEST
Apply rated power until thermal stability, remove power subject to air
temperature of - 55°C for 15 to 30 minutes
5 x rated power for 5 seconds
1000Vrms (RER 40, 45, 50, 60, 65, 70), 2000Vrms (RER55 and 75),
one minute duration
- 55°C for 24 hours
250°C for 2000 hours
MIL-STD-202 Method 106
MIL-STD-202 Method 213, Condition 1
MIL-STD-202, Method 204, Condition D
2000 hours at rated power, + 25°C, 1.5 hours “ON”, 0.5 hours “OFF”
10,000 hours at rated power, + 25°C, 1.5 hours “ON”, 0.5 hours “OFF”
MIL-STD-202, Method 211, Condition A
5 pound (RER40, 45, 60, 65), 10 pound (RER50, 55, 70, 75)
For technical questions, contact ww2bresistors@vishay.com
TEST LIMITS
±
(0.5% + 0.01Ω)
∆R
±
(0.3% + 0.01Ω)
∆R
±
(0.2% + 0.01Ω)
∆R
±
(0.3% + 0.01Ω)
∆R
±
(1.0% + 0.01Ω)
∆R
±
(0.5% + 0.01Ω)
∆R
±
(0.2% + 0.01Ω)
∆R
±
(0.2% + 0.01Ω)
∆R
±
(1.0% + 0.01Ω)
∆R
±
(2.0% + 0.01Ω)
∆R
±
(0.2% + 0.01Ω)
∆R
Document Number 30200
Revision 18-Oct-00
www.vishay.com
139
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