The Radiation Hardened HS-139RH, HS-139EH consists of four independent single or dual supply voltage comparators on a single monolithic substrate. The common mode input voltage range includes ground, even when operated from a single supply and the low supply current makes these comparators suitable for low power applications. These types were designed to directly interface with TTL and CMOS. The HS-139RH, HS-139EH are fabricated on our dielectrically isolated Rad Hard Silicon Gate (RSG) process, which provides an immunity to Single Event Latch-up and the capability of highly reliable performance in any radiation environment. Specifications for Rad Hard QML devices are controlled by the Defense Logistics Agency Land and Maritime (DLA). The SMD numbers listed below must be used when ordering. Detailed Electrical Specifications for the HS-139RH, HS-139EH are contained in SMD 5962-98613.


  • QML qualified per MIL-PRF-38535 requirements
  • Radiation environment
  • Latch-up free under any conditions
  • Total dose (Max): 3 x 105 RAD(Si)
  • SEU LET threshold: 20MeV/cm2/mg
  • Low dose rate effects immunity
  • 100V output voltage withstand capability
  • ESD protection to >3000V
  • Differential input voltage range equal to the supply voltage
  • Input offset voltage (VIO): 2mV (Max)
  • Quiescent supply current: 2mA (Max)
  • Pb-Free (RoHS Compliant)




  • Pulse generators
  • Timing circuitry
  • Level shifting
  • Analog-to-digital conversion


Design & Development