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Hermetically Sealed Precision Wirewound Resistors
(HR Series)


Hermetically Sealed Wirewound ResistorsThe HR Series Hermetically Sealed Precision Wirewound Resistors were designed for applications requiring the highest resistance stability possible. By combining the inherent stability of the wirewound construction with extensive stabilization and a total moisture seal, the HR series offers a 3 year long term stability specification of .0025% maximum. HR-Series resistors are typically used in high accuracy instrumentation and as resistance standards.

FEATURES

  • Resistance Range: 1Ω to maximum listed (see chart).
  • Standard Tolerances: ±.1%, ±.05%, ±.02%, ±.01%, ±.005%;. Available to ±.0025%.
  • Std Temperature Coefficient: ±5 PPM/°C. Available to ±1 PPM/°C over limited temperature ranges and for values over 100Ω.
  • Ratio Matches: TC Matching to ±1 PPM/°C and/or Tolerance Matching to ±.002% are available.
  • Operating Temperature Range: -55°C to ±145°C.
  • Environmental Specification: Meets or exceeds the applicable requirements of Mil-R-93 and Mil-R-39005. Markings meet Mil-Std-130.
  • Lead Material: Standard leads are solder plated copper weld above 25Ω , solder plated copper for 25Ω and lower.
  • RoHS compliant, Pb-Free construction available
  • End Seals: Pyrex disks chemically bonded to metal flanges. Disks are silicone treated to provide resistance to environmental characteristics.
  • Case: Electro-plated brass tubing with support rings. Outer insulation protection available.
  • Long Term Operating Stability: ±.001% for 1 year: ±.0025% over 3 years, when operated within the wattage and ambient temperature limits of the .0025% derating curve.
diagram of HR resistors Derating Chart
HR-500 SERIES HRK-300
HRK-300 Diagram

(click graph to enlarge)

 
PRINTED CIRCUIT RESISTORS --- HR SERIES
STYLE WATTS MAX VOLTS MAX
RES.
" L "
MAX
" D "
 ±.010"
" H "
MAX
LEAD
AWG
HR-534 .065 100 150K .500 .200 - - - - - 22
HR-538 .125 250 500K .600 .250 - - - - - 22
HR-540 .250 300 1 MEG .660 .312 - - - - - 20
HR-560 .350 400 1.5 MEG .660 .406 - - - - - 20
HR-575 .600 500 2 MEG 1.100 .406 - - - - - 20
HR-585 1.000 600 3 MEG 1.600 .500 - - - - - 20
HR-590 1.500 850 4 MEG 2.200 .500 - - - - - 20
HRK-300 .100 200 500K .450 .200 .450 22
 
 

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