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LM350K-STEEL unstable

Mike Foster
Prodigy 40 points

 We have been using LM350K-STEEL regulators set up as a stable fixed 10V supply since 1990ish.  Now the new ones that we are receiving are unstable and cause significant ripple in the 60 to 120kHz range.  Has anyone else experienced this issue?  Does anyone know if National (prior to buy-out by TI) or TI has changed the internals for the regulator that might be the cause of this issue?

  • 0
    TI__Mastermind 22610 points

    A preliminary check shows that there have been zero changes to LM350K-STEEL at the silicon level.

    Queries have been sent out, but due to time zone differences it will be several hours, at least, before I would expect any responses back.

    Knowing the exact markings on the package would be helpful.

  • 0
    TI__Mastermind 22610 points

    Only two minor changes made at assembly: one is procedural (wash); the other replaces material that is going obsolete. 

    At this point we need to know the specific device marking (i.e. three lines below the logo) to go any further. This is needed so we can attempt trace this specific lot through the process to determine where there might be variance from normal. Any other information that the vendor may have included in the shipping information could be helpful as well.