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
