LT3045 radiation exposure

We are designing a circuit board that may be exposed to significant levels of ionizing radiation in a nuclear physics research experiment.  The crucial components of the board are all rad hard.  A test portion of this circuit will be operational only when the board is not exposed to radiation.  (The main use of the test circuitry is during board commissioning, and this is done with no radiation exposure.)  The LT3045 linear regulator is a nice fit to power this test circuitry.  Can we reduce radiation damage and thus increase the lifetime of the LT3045 if we remove input power from it while it is exposed to radiation?  

   

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    •  Analog Employees 
    on Oct 1, 2021 4:36 PM

    My guess is that the LT3045 will have the same reliability whether it is powered or not when exposed to radiation.  I took a quick look at the SEE report for the RH3080, and I could not see any extreme behavior for that part that occurred during the radiation testing so the LT3045 might behave the same.  Why don't you use a radiation tested part?

  • Thanks for taking the time to answer my question.  I once read something about a space application (maybe old) where they duplicated the electronics for the mission.  The second set was left powered off until the first set began to show signs of failure.  Then it was switched on.  So there was evidence that powered and non-powered components experience different radiation damage.  But I don't know if it applies to modern components.

    I did not do an exhaustive search for possible rad hard components to replace the LT3045.  The rad hard linear regulators I saw mostly had packages that were too big and didn't have the voltages (in/out) that I needed.  And I heard stories of how they are hard to get.  But  I probably should look more carefully.