RH, NH
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Revision: 22-Jun-12 1Document Number: 30201
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Wirewound Resistors, Industrial Power,
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
Ayrton-Perry winding for lowest reactive
components
• Mounts on chassis to utilize heat-sink effect
• Excellent stability in operation (< 1 % change in
resistance)
• MIL-PRF-18546 qualified, type RE resistors can
be found at: www.vishay.com/doc?30282
• Material categorization: For definitions of
compliance please see www.vishay.com/doc?99912
Note
*Lead (Pb)-containing terminations are not RoHS-compliant. Exemptions may apply.
Note
• RH005 and NH005 printed with 5 W power rating. RH010 and NH010 printed with 10 W power rating. New construction allows these
resistors to be rated at higher wattage but will only be printed with the higher wattage upon customer request
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL
MODEL
HISTORICAL
MODEL
POWER
RATING
P25 °C W
RESISTANCE
RANGE
RESISTANCE
RANGE
RESISTANCE
RANGE
RESISTANCE
RANGE
WEIGHT
(typical)
g
± 0.05 %, ± 0.1 % ± 0.25 % ± 0.5 % ± 1 %, ± 3 %, ± 5 %
RH005 RH-5 7.5 0.5 to 6.75K 0.1 to 8.6K 0.05 to 8.6K 0.02 to 24.5K 3
NH005 NH-5 7.5 0.5 to 2.32K 0.1 to 3.27K 0.05 to 3.27K 0.05 to 12.75K 3
RH010 RH-10 12.5 0.5 to 12.7K 0.1 to 16.69K 0.05 to 16.69K 0.01 to 47.1K 5
NH010 NH-10 12.5 0.5 to 4.45K 0.1 to 5.54K 0.05 to 5.54K 0.05 to 23.5K 5
RH025 RH-25 25 0.5 to 25.7K 0.1 to 32.99K 0.05 to 32.99K 0.01 to 95.2K 12
NH025 NH-25 25 0.5 to 9.09K 0.1 to 12.8K 0.05 to 12.8K 0.05 to 47.6K 12
RH050 RH-50 50 0.5 to 73.4K 0.1 to 96K 0.05 to 96K 0.01 to 273K 28
NH050 NH-50 50 0.5 to 26K 0.1 to 36.7K 0.05 to 36.7K 0.05 to 136K 28
RH100 RH-100 100 0.5 to 90K 0.1 to 90K 0.05 to 90K 0.05 to 90K 353
NH100 NH-100 100 0.5 to 37.5K 0.1 to 37.5K 0.05 to 37.5K 0.05 to 37.5K 353
RH250 RH-250 250 0.5 to 116K 0.1 to 116K 0.05 to 116K 0.05 to 116K 637
NH250 NH-250 250 0.5 to 48.5K 0.1 to 48.5K 0.05 to 48.5K 0.05 to 48.5K 637
TECHNICAL SPECIFICATIONS
PARAMETER UNIT RH RESISTOR CHARACTERISTICS
Temperature Coefficient ppm/°C ± 20 for 10 and above; ± 50 for 1 to 9.9 , ± 100 for 0.1 to 0.99
Maximum Working Voltage V (P x R)1/2
Insulation Resistance 10 000 M minimum dry, 1000 M minimum after moisture test
Solderability - Meets requirements of ANSI J-STD-002
Operating Temperature Range °C - 55 to + 250
GLOBAL PART NUMBER INFORMATION
Global Part Numbering example: RH0054R125FC02
GLOBAL MODEL RESISTANCE VALUE TOLERANCE CODE PACKAGING SPECIAL
RH005
(See Standard
Electrical
Specifications
Global Model
column for
options)
R = Decimal
K = Thousand
15R00 = 15
10K00 = 10 k
A = 0.05 %
B = 0.1 %
C = 0.25 %
D = 0.5 %
F = 1.0 %
H = 3.0 %
J = 5.0 %
E02 = Lead (Pb)-free, card pack (RH005 - RH050)
E01 = Lead (Pb)-free, skin pack (RH100 and RH250)
(Dash Number)
(up to 3 digits)
From 1 to 999
as applicable
C02 = Tin/lead, card pack (RH005 - RH050)
J01 = Tin/lead, skin pack (RH100 and RH250)
Historical Part Numbering example: RH-5 4.125 1 % C02
RH-5 4.125 1 % C02
HISTORICAL MODEL RESISTANCE VALUE TOLERANCE CODE PACKAGING
RH0054R125FC02
RH, NH
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Revision: 22-Jun-12 2Document Number: 30201
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ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
DIMENSIONS in inches [millimeters]
DIMENSIONS in inches [millimeters]
GLOBAL
MODEL
DIMENSIONS in inches [millimeters]
ABCDEFGHJKLMNP
RH005
NH005
0.444
± 0.005
[11.28
± 0.127]
0.490
± 0.005
[12.45
± 0.127]
0.600
± 0.030
[15.24
± 0.787]
1.125
± 0.062
[28.58
± 1.57]
0.334
± 0.015
[8.48
± 0.381]
0.646
± 0.015
[16.41
± 0.381]
0.320
± 0.015
[8.13
± 0.381]
0.065
± 0.010
[1.65
± 0.254]
0.133
± 0.010
[3.38
± 0.254]
0.078
± 0.010
[1.98
± 0.254]
0.093
± 0.005
[2.36
± 0.127]
0.078
± 0.015
[1.98
± 0.381]
0.050
± 0.005
[1.27
± 0.127]
0.266
± 0.062
[6.76
± 1.57]
RH010
NH010
0.562
± 0.005
[14.27
± 0.127]
0.625
± 0.005
[15.88
± 0.127]
0.750
± 0.031
[19.05
± 0.787]
1.375
± 0.062
[34.93
± 1.57]
0.420
± 0.015
[10.67
± 0.381]
0.800
± 0.015
[20.32
± 0.381]
0.390
± 0.015
[9.91
± 0.381]
0.075
± 0.010
[1.91
± 0.254]
0.165
± 0.010
[4.19
± 0.254]
0.093
± 0.010
[2.36
± 0.254]
0.094
± 0.005
[2.39
± 0.127]
0.102
± 0.015
[2.59
± 0.381]
0.085
± 0.005
[2.16
± 0.127]
0.312
± 0.062
[7.92
± 1.57]
RH025
NH025
0.719
± 0.005
[18.26
± 0.127]
0.781
± 0.005
[19.84
± 0.127]
1.062
± 0.031
[26.97
± 0.787]
1.938
± 0.062
[49.23
± 1.57]
0.550
± 0.015
[13.97
± 0.381]
1.080
± 0.015
[27.43
± 0.381]
0.546
± 0.015
[13.87
± 0.381]
0.075
± 0.010
[1.91
± 0.254]
0.231
± 0.010
[5.87
± 0.254]
0.172
± 0.010
[4.37
± 0.254]
0.125
± 0.005
[3.18
± 0.127]
0.115
± 0.015
[2.92
± 0.381]
0.085
± 0.005
[2.16
± 0.127]
0.438
± 0.062
[11.13
± 1.57]
RH050
NH050
1.562
± 0.005
[39.67
± 0.127]
0.844
± 0.005
[21.44
± 0.127]
1.968
± 0.031
[49.99
± 0.787]
2.781
± 0.062
[70.64
± 1.57]
0.630
± 0.015
[16.00
± 0.381]
1.140
± 0.015
[28.96
± 0.381]
0.610
± 0.015
[15.49
± 0.381]
0.088
± 0.010
[2.24
± 0.254]
0.260
± 0.010
[6.60
± 0.254]
0.196
± 0.010
[4.98
± 0.254]
0.125
± 0.005
[3.18
± 0.127]
0.107
± 0.015
[2.72
± 0.381]
0.085
± 0.005
[2.16
± 0.127]
0.438
± 0.062
[11.13
± 1.57]
RH005, 010, 025, 050
NH005, 010, 025, 050
P
D
C
A
L
M
N
J
F
E
H
G
K
B
RH250, NH250
RH100, NH100
2.25 ± 0.010
[57.15 ± 0.254]
0.989 ± 0.031
[25.12 ± 0.787]
2.812 ± 0.031
[71.42 ± 0.787]
3.50 ± 0.031
[88.90 ± 0.787]
Nickel plated
brass nut
stainless steel stud
1.125 ± 0.031
[28.58 ± 0.787]
0.188 ± 0.010
[4.78 ± 0.254]
Dia. typ.
12 - 24
UNC-2A
Thd. typ. 2.75 ± 0.010
[69.85 ± 0.254]
0.375 ± 0.031
[9.52 ± 0.787]
5.478 ± 0.093
[139.14 ± 2.36]
1.75 ± 0.031
[44.45 ± 0.787]
2.188 ± 0.031
[55.58 ± 0.787]
2.125 ± 0.031
[53.98 ± 0.787]
0.250 ± 0.031
[6.35 ± 0.787]
typ.
4.50 ± 0.031
[114.30 ± 0.787]
2.50 ± 0.010
[63.50 ± 0.254]
7.0 ± 0.093 [177.80 ± 2.36]
0.875 ± 0.010
[22.23 ± 0.254]
3.0 ± 0.010
[76.20 ± 0.254]
3.875 ± 0.010
[98.42 ± 0.254]
0.770 ± 0.015
[19.56 ± 0.381]
0.188 ± 0.031
[4.78 ± 0.787]
typ.
1.812 ± 0.031
[46.02 ± 0.787]
0.312 ± 0.031
[7.92 ± 0.787]
1.25 ± 0.062
[31.75 ± 1.575]
1.25 ± 0.062
[31.75 ± 1.575]
1/4 - 20
UNC-2A thd. typ.
0.955 ± 0.015
[24.26 ± 0.381]
3.0 ± 0.031
[76.20 ± 0.787]
Nickel plated
brass nut
stainless steel stud
0.188 ± 0.010
[4.78 ± 0.254]
Dia. typ.
RH, NH
www.vishay.com Vishay Dale
Revision: 22-Jun-12 3Document Number: 30201
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THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
POWER RATING
Vishay RH resistor wattage ratings are based on mounting to the following heat sink:
RH005 and RH010: 4" x 6" x 2" x 0.040" thick aluminum chassis (129 sq. in. surface area)
RH025: 5" x 7" x 2" x 0.040" thick aluminum chassis (167 sq. in. surface area)
RH050: 12" x 12" x 0.059" thick aluminum panel (291 sq. in. surface area)
RH100 and RH250: 12" x 12" x 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 = RH005 and RH010 size resistor, unmounted
B = RH025 size resistor, unmounted
C = RH050, RH100 and RH250 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 = RH005 and RH010 size resistor
B = RH025 size resistor
C = RH050, RH100 and RH250 size resistor
FREE AIR POWER RATING
GLOBAL
MODEL
RH005
NH005
RH010
NH010
RH025
NH025
RH050
NH050
RH100
NH100
RH250
NH250
W at 25 °C
4.5 7.5 12.5 20 40 100
RATED POWER IN %
AMBIENT TEMPERATURE IN °C
25
120
A
C
D
B
0
20
40
60
80
100
- 55 - 50 0 50 150 250
0 10080604020
0
100
90
80
70
60
50
40
30
20
10
% OF RECOMMENDED HEAT SINK AREA
RATED POWER IN %
C
B
A
RH, NH
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Revision: 22-Jun-12 4Document Number: 30201
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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 RH005 through RH050 size
terminal finish - Tin/lead is 60/40 Sn/Pb w/Nickel underplate
and Lead (Pb)-free is Ni/Pd/Au, finish is on copper clad
steel core terminal. For RH100 and RH250 terminals are
threaded stainless steel.
Part Marking: Dale, model, wattage, value, tolerance, date
code
NH NON-INDUCTIVE
Models of equivalent physical and electrical specifications
are available with non-inductive (Ayrton-Perry) winding.
They are identified by substituting the letter N for R in the
model number (NH005, 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
Vishay RH and NH resistors are listed as qualified on the
MIL-PRF-18546 QPL. MIL-PRF-18546 qualified, type RE
resistors can be found at: www.vishay.com/doc?30282
PERFORMANCE
TEST CONDITIONS OF TEST TEST LIMITS
Thermal Shock Rated power applied until thermally stable, then a minimum of 15 min at - 55 °C ± (0.5 % + 0.05 ) R
Short Time Overload 5 x rated power for 5 s ± (0.5 % + 0.05 ) R
Dielectric Withstanding
Voltage
1000 Vrms for RH005, RH010 and RH025; 2000 Vrms for RH050;
4500 Vrms for RH100 and RH250; duration 1 min ± (0.2 % + 0.05 ) R
Temperature 250 °C for 2 h ± (0.5 % + 0.05 ) R
Moisture Resistance MIL-STD-202 Method 106, 7b not applicable ± (1.0 % + 0.05 ) R
Shock, Specified Pulse MIL-STD-202 Method 213, 100 g’s for 6 ms, 10 shocks ± (0.2 % + 0.05 ) R
Vibration, High Frequency Frequency varied 10 Hz to 2000 Hz, 20 g peak, 2 directions 6 h each ± (0.2 % + 0.05 ) R
Load Life 1000 h at rated power, + 25 °C, 1.5 h “ON”, 0.5 h “OFF” ± (1.0 % + 0.05 ) R
Terminal Strength 30 s, 5 pound pull test for RH005 and RH010, 10 pound pull test for other sizes;
torque test - 24 pound inch for RH100 and 32 pound inch for RH250 ± (0.2 % + 0.05 ) R
Legal Disclaimer Notice
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Revision: 12-Mar-12 1Document Number: 91000
Disclaimer
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