www.vishay.com For technical questions, contact: ww2bresistors@vishay.com Document Number: 30201
166 Revision: 11-Jul-07
RH, NH
Vishay Dale
Wirewound Resistors, Military, MIL-PRF-18546 Qualified,
Type RE, Aluminum Housed, Chassis Mount
FEATURES
•Molded construction for total environmental
protection
•Complete welded construction
•Meets applicable requirements of
MIL-PRF-18546
•Available in non-inductive styles (type NH) with
Aryton-Perry winding for lowest reactive
components
•Mounts on chassis to utilize heat-sink effect
•Excellent stability in operation (< 1 % change in resistance)
Note: Figures in parentheses on RH-5 and RH-10 indicate wattage printed on parts, new construction allows these resistors to be rated at
higher wattage but will only be printed with the higher wattage on customer request.
* Pb containing terminations are not RoHS compliant, exemptions may apply
Available
Pb-free
RoHS*
COMPLIANT
e4
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL
MODEL HISTORICAL
MODEL
MIL-PRF-
18546
TYPE
POWER RATING
P
25 °C
W
RESISTANCE RANGE
MIL. RANGE SHOWN IN BOLD FACE
Ω
WEIGHT
(Typical)
g
DALE MILITARY ± 0.05 %, ± 0.1 % ± 0.25 % ± 0.5 % ± 1 %, ± 2 %, ± 5 %
RH005 RH-5
-
RE60G
7.5 (5)
5
0.5 - 6.75K
-0.1 - 8.6K
-0.05 - 8.6K
-0.02 - 24.5K
0.10 - 3.32K
3
NH005 NH-5
-
RE60N
7.5 (5)
5
0.5 - 2.32K
-0.1 - 3.27K
-0.05 - 3.27K
-0.05 - 12.75K
1.0 - 1.65K
3.3
RH010 RH-10
-
RE65G
12.5 (10)
10
0.5 - 12.7K
-0.1 - 16.69K
-0.05 - 16.69K
-0.01 - 47.1K
0.10 - 5.62K
6
NH010 NH-10
-
RE65N
12.5 (10)
10
0.5 - 4.45K
-0.1 - 5.54K
-0.05 - 5.54K
-0.05 - 23.5K
1.0 - 2.8K
8.8
RH025 RH-25
-
RE70G
25
20
0.5 - 25.7K
-0.1 - 32.99K
-0.05 - 32.99K
-0.01 - 95.2K
0.10 - 12.1K
13
NH025 NH-25
-
RE70N
25
20
0.5 - 9.09K
-0.1 - 12.8K
-0.05 - 12.8K
-0.05 - 47.6K
1.0 - 6.04K
16.5
RH050 RH-50
-
RE75G
50
30
0.5 - 73.4K
-0.1 - 96K
-0.05 - 96K
-0.01 - 273K
0 .10 - 39.2K
28
NH050 NH-50
-
RE75N
50
30
0.5 - 26K
-0.1 - 36.7K
-0.05 - 36.7K
-0.05 - 136K
1.0 - 19.6K
35
RH100 RH-100
-
RE77G
100
75
0.5 - 90K
-0.1 - 90K
-0.05 - 90K
-0.05 - 90K
0.05 - 29.4K
350
NH100 NH-100
-
RE77N
100
75
0.5 - 37.5K
-0.1 - 37.5K
-0.05 - 37.5K
-0.05 - 37.5K
1.0 - 14.7K
385
RH250 RH-250
-
RE80G
250
120
0.5 - 116K
-0.1 - 116K
-0.05 - 116K
-0.05 - 116K
0.10 - 35.7K
630
NH250 NH-250
-
RE80N
250
120
0.5 - 48.5K
-0.1 - 48.5K
-0.05 - 48.5K
-0.05 - 48.5K
1.0 - 17.4K
690
GLOBAL PART NUMBER INFORMATION
New Global Part Numbering: RH0054R125FC02 (preferred part number format)
GLOBAL MODEL RESISTANCE
VALUE
TOLERANCE
CODE PACKAGING SPECIAL
RH005
(See “Standard
Electrical
Specifications”
table above for
additional P/N’s)
L = Milliohm
R = Decimal
K = Thousand
8L000 = 0.008 Ω
15R00 = 15 Ω
A = 0.05 %
B = 0.1 %
C = 0.25 %
D = 0.5 %
F = 1.0 %
E02 = Lead (Pb)-free, Card Pack (RH005 - RH050)
E01 = Lead (Pb)-free, Skin Pack (RH100 & RH250)
Lead (Pb)-free is not available on RE military type
(Dash Number)
(up to 3 digits)
From 1 - 999
as applicable
C02 = Tin/Lead, Card Pack (RH005 - RH050)
J01 = Tin/Lead, Skin Pack (RH100 & RH250)
Historical Part Number example: RH-5 4.125 Ω1 % C02 (will continue to be accepted)
RH-5 4.125 Ω1 % C02
HISTORICAL MODEL RESISTANCE VALUE TOLERANCE CODE PACKAGING
H0054R125RFC0 2
Document Number: 30201 For technical questions, contact: ww2bresistors@vishay.com www.vishay.com
Revision: 11-Jul-07 167
RH, NH
Wirewound Resistors, Military, MIL-PRF-18546 Qualified,
Type RE, Aluminum Housed, Chassis Mount Vishay Dale
DIMENSIONS
DIMENSIONS
RH-5, -10, -25, -50
NH-5, -10, -25, -50
P
D
C
A
L
M
N
J
F
E
H
G
K
B
MODEL
DIMENSIONS in millimeters [inches]
AB
C
DEFGHJKLMNP
RH-5
NH-5
11.28
± 0.127
[0.444
± 0.005]
12.45
± 0.127
[0.490
± 0.005]
15.24
± 0.7871
[0.600
± 0.03]
28.58
± 1.57
[1.125
± 0.062]
8.48
± 0.381
[0.334
± 0.015]
16.41
± 0.381
[0.646
± 0.015]
8.13
± 0.381
[0.320
± 0.015]
1.65
± 0.254
[0.065
± 0.010]
3.38
± 0.254
[0.133
± 0.010]
1.98
± 0.254
[0.078
± 0.010]
2.36
± 0.127
[0.093
± 0.005]
1.98
± 0.381
[0.078
± 0.015]
1.27
± 0.127
[0.050
± 0.005]
6.76
± 1.57
[0.266
± 0.062]
RH-10
NH-10
14.27
± 0.127
[0.562
± 0.005]
15.88
± 0.127
[0.625
± 0.005]
19.05
± 0.787
[0.750
± 0.031]
34.93
± 1.57
[1.375
± 0.062]
10.67
± 0.381
[0.420
± 0.015]
20.32
± 0.381
[0.800
± 0.015]
9.91
± 0.381
[0.390
± 0.015]
1.91
± 0.254
[0.075
± 0.010]
4.19
± 0.254
[0.165
± 0.010]
2.36
± 0.254
[0.093
± 0.010]
2.39
± 0.127
[0.094
± 0.005]
2.59
± 0.381
[0.102
± 0.015]
2.16
± 0.127
[0.085
± 0.005]
7.92
± 1.57
[0.312
± 0.062]
RH-25
NH-25
18.26
± 0.127
[0.719
± 0.005]
19.84
± 0.127
[0.781
± 0.005]
26.97
± 0.787
[1.062
± 0.031]
49.23
± 1.57
[1.938
± 0.062]
13.97
± .381
[0.550
± 0.015]
27.43
± 0.381
[1.080
± 0.015]
13.87
± 0.381
[0.546
± 0.015]
1.91
± 0.254
[0.075
± 0.010]
5.87
± 0.254
[0.231
± 0.010]
4.37
± 0.254
[0.172
± 0.010]
3.18
± 0.127
[0.125
± 0.005]
2.92
± 0.381
[0.115
± 0.015]
2.16
± 0.127
[0.085
± 0.005]
11.13
± 1.57
[0.438
± 0.062]
RH-50
NH-50
39.67
± 0.127
[1.562
± 0.005]
21.44
± 0.127
[0.844
± 0.005]
49.99
± 0.787
[1.968
± 0.031]
70.64
± 1.57
[2.781
± 0.062]
16.00
± 0.381
[0.630
± 0.015]
28.96
± 0.381
[1.140
± 0.015]
15.49
± 0.381
[0.610
± 0.015]
2.24
± 0.254
[0.088
± 0.010]
6.60
± 0.254
[0.260
± 0.010]
4.98
± 0.254
[0.196
± 0.010]
3.18
± 0.127
[0.125
± 0.005]
2.72
± 0.381
[0.107
± 0.015]
2.16
± 0.127
[0.085
± 0.005]
11.13
± 1.57
[0.438
± 0.062]
RH-250, NH-250
RH-100, NH-100
57.15 ± 0.254
[2.25 ± 0.010]
25.12 ± 0.787
[0.989 ± 0.031]
71.42 ± 0.787
[2.812 ± 0.031]
88.90 ± 0.787
[3.50 ± 0.031]
Nickel Plated
Brass Nut
Stainless Steel Stud
28.58 ± 0.787
[1.125 ± 0.031]
4.78 ± 0.254
[0.188 ± 0.010]
Dia. Typ.
12 - 24
UNC-2A
Thd. Typ.
69.85 ± 0.254
[2.75 ± 0.010]
9.52 ± 0.787
[0.375 ± 0.031]
139.14 ± 2.36
[5.478 ± 0.093]
44.45
± 0.787
[1.75 ± 0.031]
55.58
± 0.787
[2.188 ± 0.031]
53.98
± 0.787
[2.125 ± 0.031]
6.35
± 0.787
[0.250 ± 0.031
Typ.]
114.30 ± 0.787
[4.50 ± 0.031]
63.50 ± 0.254
[2.50 ± 0.010]
177.80 ± 2.36 [7.0 ± 0.093]
22.23 ± 0.254
[0.875 ± 0.010]
76.20 ± 0.254
[3.0 ± 0.010]
98.42 ± 0.254
[3.875 ± 0.010]
19.56
± 0.381
[0.770 ± 0.015]
4.78
± 0.787
[0.188 ± 0.031]
Typ.
46.02
± 0.787
[1.812 ± 0.031]
7.92 ± 0.787
[0.312 ± 0.031]
31.75 ± 1.575
[1.25 ± 0.062]
31.75 ± 1.575
[1.25 ± 0.062]
1/4 - 20
UNC-2A Thd. Typ.
24.26
± 0.381
[0.955 ± 0.015]
76.20 ± 0.787
[3.0 ± 0.031]
Nickel Plated
Brass Nut
Stainless Steel Stud
4.78 ± 0.254
[0.188 ± 0.010]
Dia. Typ.
www.vishay.com For technical questions, contact: ww2bresistors@vishay.com Document Number: 30201
168 Revision: 11-Jul-07
RH, NH
Vishay Dale Wirewound Resistors, Military, MIL-PRF-18546 Qualified,
Type RE, Aluminum Housed, Chassis Mount
POWER RATING
Vishay RH resistor wattage ratings are based on mounting to the following heat sink:
RH-5 and RH-10: 4" × 6" × 2" × 0.040" thick aluminum chassis (129 sq. in. surface area)
RH-25: 5" × 7" × 2" × 0.040" thick aluminum chassis (167 sq. in. surface area)
RH-50: 12" × 12" × 0.059" thick aluminum panel (291 sq. in. surface area)
RH-100 and RH-250: 12" × 12" × 0.125" thick aluminum panel (294 sq. in. surface area)
AMBIENT TEMPERATURE DERATING
Derating is required for ambient temperatures above 25 °C, see the following graph.
Curves A, B, C apply to operation of unmounted resistors. Curve D applies to all types when mounted to specified heat sink.
A = RH-5 and RH-10 size resistor, unmounted
B = RH-25 size resistor, unmounted
C = RH-50, RH-100 and RH-250 size resistor, unmounted
D = All types mounted to recommended aluminum heat sink
REDUCED HEAT SINK DERATING:
Derating is also required when recommended heat sink
area is reduced.
A = RH-5 and RH-10 size resistor
B = RH-25 size resistor
C = RH-50, RH-100 and RH-250 size resistor
TECHNICAL SPECIFICATIONS
PARAMETER UNIT RH RESISTOR CHARACTERISTICS
Temperature Coefficient ppm/°C ± 100 for 0.1 Ω to 0.99 Ω, ± 50 for 1 Ω to 9.9 Ω, ± 20 for 10 Ω and above
Dielectric Withstanding Voltage VAC 1000 for RH/5, RH-10 and RH/25, 2000 for RH/50, 4500 for RH/100 and RH/250
Short Time Overload - 5 × rated power for 5 seconds
Maximum Working Voltage V (P x R)1/2
Insulation Resistance Ω10 000 MΩ minimum dry, 1000 MΩ minimum after moisture test
Terminal Strength lb 5 minimum for RH-5 and RH-10, 10 minimum for all others
Solderability - MIL-PRF-18546 Type - Meets requirements of ANSI J-STD-002
Operating Temperature Range °C - 55/+ 250
% NI R
E
W
O
P
D
ET
A
R
Derating
- 55 - 50 0 50 150 250
AMBIENT TEMPERATURE IN °C
25
120
A
C
D
B
0
20
40
60
80
100
100
90
80
70
60
50
40
30
20
10
0020406080100
% OF RECOMMENDED HEAT SINK AREA
% NI REWOP DETAR
Heat Sink Derating
A
C
B
Document Number: 30201 For technical questions, contact: ww2bresistors@vishay.com www.vishay.com
Revision: 11-Jul-07 169
RH, NH
Wirewound Resistors, Military, MIL-PRF-18546 Qualified,
Type RE, Aluminum Housed, Chassis Mount Vishay Dale
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: For RH-5 through RH-50 size terminal
finish - Tin/lead is 60/40 Sn/Pb w/Nickel underplate & Lead
(Pb)-free is Ni/Pd/Au, finish is on copper clad steel core
terminal. For RH-100 & RH-250 terminals are threaded
stainless steel.
Note: Military (RE) parts are only available with tin/lead finish
Part Marking: DALE, Model, Wattage, Value, Tolerance,
Date Code
NH 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 (NH-5, for example).
SPECIAL MODIFICATIONS
A number of special modifications to the aluminum housed
resistor style are available upon request. Special
modifications include:
•Terminal configurations and materials
•Resistance values and tolerances
•Low resistance temperature coefficient (RTC)
•Housing configuration
•Threaded mounting holes
•Preconditioning and other additional testing
APPLICABLE MIL SPECIFICATIONS
MIL-PRF-18546 is the military specification covering
aluminum housed, chassis mount, power resistors. VISHAY
RH and NH resistors are listed as qualified on the
MIL-PRF-18546 QPL.
PERFORMANCE
TEST CONDITIONS OF TEST TEST LIMITS
Thermal Shock Rated power applied until thermally stable, then a minimum of 15 minutes at - 55 °C ± (0.5 % + 0.05 Ω) ΔR
Short Time Overload 5 × rated power for 5 seconds ± (0.5 % + 0.05 Ω) ΔR
Dielectric Withstanding Voltage 1000 Vrms for RH-5, RH-10 and RH-25; 2000 Vrms for RH-50
4500 Vrms for RH-100 and RH-250; duration one minute ± (0.2 % + 0.05 Ω) ΔR
Temperature 250 °C for 2 hours ± (0.5 % + 0.05 Ω) ΔR
Moisture Resistance MIL-STD-202 Method 106, 7b not applicable ± (1.0 % + 0.05 Ω) ΔR
Shock, Specified Pulse MIL-STD-202 Method 213, 100 g's for 6 ms, 10 shocks ± (0.2 % + 0.05 Ω) ΔR
Vibration, High Frequency Frequency varied 10 to 2000 Hz, 20 g peak, 2 directions 6 hours each ± (0.2 % + 0.05 Ω) ΔR
Load Life 1000 hours at rated power, + 25 °C, 1.5 hours “ON”, 0.5 hours “OFF” ± (1.0 % + 0.05 Ω) ΔR
Terminal Strength 30 second, 5 pound pull test for RH-5 and RH-10, 10 pound pull test for other sizes,
torque test - 24 pound inch for RH-100 and 32 pound inch for RH-250 ± (0.2 % + 0.05 Ω) ΔR
Document Number: 91000 www.vishay.com
Revision: 18-Jul-08 1
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Vishay
All product specifications and data are subject to change without notice.
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(collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein
or in any other disclosure relating to any product.
Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any
information provided herein to the maximum extent permitted by law. The product specifications do not expand or
otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed
therein, which apply to these products.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this
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