RH005 Datasheet, PDF (4/5 Pages) Vishay Siliconix – Wirewound Resistors, Military, MIL-PRF-18546 Qualified, Type RE, Aluminum Housed, Chassis Mount

Wirewound Resistors, Military, MIL-PRF-18546 Qualified,
Type RE, Aluminum Housed, Chassis Mount
RH, NH
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 and
Lead (Pb)-free is Ni/Pd/Au, finish is on copper clad steel core
terminal. For RH-100 and 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
Thermal Shock
Short Time Overload
Dielectric Withstanding
Voltage
Temperature
Moisture Resistance
Shock, Specified Pulse
Vibration, High Frequency
Load Life
Terminal Strength
CONDITIONS OF TEST
Rated power applied until thermally stable, then a minimum of 15 min at - 55 °C
5 x rated power for 5 s
1000 V_rms for RH-5, RH-10 and RH-25; 2000 V_rms for RH-50
4500 V_rms for RH-100 and RH-250; duration 1 min
250 °C for 2 h
MIL-STD-202 Method 106, 7b not applicable
MIL-STD-202 Method 213, 100 g's for 6 ms, 10 shocks
Frequency varied 10 to 2000 Hz, 20 g peak, 2 directions 6 h each
1000 h at rated power, + 25 °C, 1.5 h “ON”, 0.5 h “OFF”
30 s, 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
TEST LIMITS
± (0.5 % + 0.05 Ω) ΔR
± (0.5 % + 0.05 Ω) ΔR
± (0.2 % + 0.05 Ω) ΔR
± (0.5 % + 0.05 Ω) ΔR
± (1.0 % + 0.05 Ω) ΔR
± (0.2 % + 0.05 Ω) ΔR
± (0.2 % + 0.05 Ω) ΔR
± (1.0 % + 0.05 Ω) ΔR
± (0.2 % + 0.05 Ω) ΔR
Document Number: 30201
Revision: 11-Jul-07
For technical questions, contact: [e-mail]
www.vishay.com
157