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LM158QML: Literature Number SNAA175 – this is a test report on single event transients (SET) for 5962R8771003VxA

Robert Eschbach
Expert 6675 points
Part Number: LM158QML
Other Parts Discussed in Thread: LM158, LM124

From my customer-

I am preparing a radiation analysis of a transducer for an aerospace customer and I have a couple of questions for you on regarding TI Literature Number SNAA175 – this is a test report on single event transients (SET) for the LM158AxRLQMLV / 5962R8771003VxA product line.

First of all, would it be possible to get a brief description of the SET mechanism / cause in these devices?

Secondly, do you have an estimate for the linear energy threshold and proton energy thresholds to generate a SET on these devices? It looks like the lowest LET tested was 3.49 MEV-cm^2/mg which was able to produce SETs.

Finally, a graph of cross section compared to LET for ions is provided on page 3. Can you provide any information regarded saturated cross-section with respect to protons?

  • 0
    TI__Genius 17085 points

    Hello Robert,

    The most important thing to remember on SETs for a linear device is that the probability, duration and amplitude are highly dependent upon operating conditions.  SETs might be totally mitigated under the certain operating conditions.

    We did not do enough testing on the LM158 to find the LET threshold.   Under certain operating conditinos, I would speculate it could be under 2 MeV-cm2/mg while under other operating conditions it could be much higher.   As far as correlation between proton energy and heavy ion LET threshold, that is still up for debate.   A general rule of thumb is that if SEEs are seen below 14 MeV-cm^2/mg than it might be necessary to test with protons.  But, we have seen products that have SEEs below 3 MeV-cm^2/mg but do not exhibit any SEEs with 200 MeV protons.

    The LM158 is the dual version of the quad LM124.   The design and layout of the channels are basically the same.   The LM124 is probably the radiation tested device of all time and there are many papers with in depth discussions on the SET mechanisms.  A good starting point may be to check out references [1], [12], [14], [15] and [17] of the following paper:

    www.ti.com/.../snaa172.pdf