RH, NH
www.vishay.com
Vishay Dale
Revision: 23-Jun-16
4
Document Number: 30201
For technical questions, contact: ww2aresistors@vishay.com
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
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 5x rated power for 5 s ± (0.5 % + 0.05 ) R
Dielectric Withstanding
Voltage
1000 V
RMS
for RH005, RH010 and RH025; 2000 V
RMS
for RH050;
4500 V
RMS
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
