C&H Technology ENH User Manual
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
POWER RATING
P
MODEL
ENH-5 RER40 5 3 1 - 1.65K 3.3
ENH-10 RER45 10 6 1 - 2.8K 8.8
ENH-25 RER50 20 8 1 - 6.04K 16.5
ENH-50 RER55 30 10 1 - 4.99K 35
ERH-5 RER60 5 3 0.10 - 3.32K 3
ERH-10 RER65 10 6 0.10 - 5.62K 6
ERH-25 RER70 20 8 0.10 - 12.1K 13
ERH-50 RER75 30 10 0.10 - 39.2K 28
MIL-PRF-39009
TYPE
MOUNTED FREE AIR
25 °C
W
MILITARY
RESISTANCE RANGE
± 1 %
Ω
WEIGHT
(typical)
g
TECHNICAL SPECIFICATIONS
PARAMETER UNIT ERH, ENH RESISTOR CHARACTERISTICS
Temperature Coefficient ppm/°C ± 100 for 0.1 Ω to 0.99 Ω, ± 50 for 1 Ω to 19.9 Ω, ± 20 for 20 Ω and above
Dielectric Withstanding Voltage V
Short Time Overload - 5 x rated power for 5 s
Maximum Working Voltage V
Insulation Resistance Ω 10 000 MΩ minimum dry, 1000 MΩ minimum after moisture test
Terminal Strength lb 5 pull for ERH-5 and ERH-10, 10 pull for ERH-25 and ERH-50
Solderability - Meets requirements of ANSI J-STD-002
Operating Temperature Range °C - 55 to + 250
AC
1000 for ERH-5, ERH-10 and ERH-25, 2000 for ERH-50
1/2
(P x R)
GLOBAL PART NUMBER INFORMATION
Global/Military Part Numbering: RER65F1001RC02
65F1 01R0ER C02R
MIL TYPE TOLERANCE CODE RESISTANCE VALUE FAILURE RATE PACKAGING CODE
RER40
RER45
RER50
RER55
RER60
RER65
RER70
RER75
www.vishay.com For technical questions, contact: ww2bresistors@vishay.com
160 Revision: 29-May-08
F = ± 1.0 % 3 digit significant figure,
followed by a multiplier
49R9 = 49.9 Ω
1000 = 100 Ω
1001 = 1000 Ω
M = 1.0 %/1000 h
P = 0.1 %/1000 h
R = 0.01 %/1000 h
C02 = Tin/lead,
CSL = Tin/lead, card pack,
card pack
single lot date code
Document Number: 30200
ERH, ENH
Wirewound Resistors, Military/Established Reliability
MIL-PRF-39009 Qualified, Type RER, R Level
DIMENSIONS
B
MODEL
ERH-5
ENH-5
ERH-10
ENH-10
ERH-25
ENH-25
ERH-50
ENH-50
ABCD E F GH J K L MN P
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]
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]
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]
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]
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
POWER RATING
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" x 7" x 2" x 0.040" thick aluminum
chassis
K
± 0.015
± 0.381]
± 0.015
[10.670
± 0.381]
± 0.015
[13.970
± 0.381]
± 0.015
[16.000
± 0.381]
®
D
C
A
P
L
DIMENSIONS in inches [millimeters]
0.334
[8.480
0.420
0.550
0.630
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]
Vishay Dale
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]
- 50
F
E
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]
25
H
G
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]
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]
AMBIENT TEMPERATURE IN °C
M
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]
N
J
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
RATED POWER IN %
20
0
- 55 0 50 100 150 200 250
Derating
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.
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]
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]
PERFORMANCE
TEST CONDITIONS OF TEST TEST LIMITS
Low Temperature Operation
Short Time Overload 5 x rated power for 5 s ± (0.3 % + 0.01 Ω) ΔR
Dielectric Withstanding Voltage
Low Temperature Storage - 55 °C for 24 h ± (0.3 % + 0.01 Ω) ΔR
High Temperature Exposure 250 °C for 2000 h ± (1.0 % + 0.01 Ω) ΔR
Moisture Resistance MIL-STD-202, Method 106 ± (0.5 % + 0.01 Ω) ΔR
Shock, Specified Pulse MIL-STD-202, Method 213, condition 1 ± (0.2 % + 0.01 Ω) ΔR
Vibration, High Frequency MIL-STD-202, Method 204, condition D ± (0.2 % + 0.01 Ω) ΔR
Load Life 2000 h at rated power, + 25 °C, 1.5 h “ON”, 0.5 h “OFF” ± (1.0 % + 0.01 Ω) ΔR
Extended Life 10 000 h at rated power, + 25 °C, 1.5 h “ON”, 0.5 h “OFF” ± (2.0 % + 0.01 Ω) ΔR
Terminal Strength
Document Number: 30200 For technical questions, contact: ww2bresistors@vishay.com
Revision: 29-May-08 161
Apply rated power until thermal stability, remove power subject to air
temperature of - 55 °C for 15 to 30 min
1000 V
1 min duration
MIL-STD-202, Method 211, condition A
5 pound (RER40, 45, 60, 65), 10 pound (RER50, 55, 70, 75)
(RER 40, 45, 50, 60, 65, 70), 2000 V
rms
(RER55 and 75),
rms
± (0.5 % + 0.01 Ω) ΔR
± (0.2 % + 0.01 Ω) ΔR
± (0.2 % + 0.01 Ω) ΔR
www.vishay.com
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