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REF3333 Voltage Reference issue

Other Parts Discussed in Thread: REF3333

After review of the spec sheets available for REF3333, I have a question that you might be able to help me with.  The input voltage is specified to be 3.5V-5.5V.  Input voltage is not very well defined during all our manufacturing and calibration processes, so there are times where the component could see up to 10V.  I know this is probably bad, but what is the failure mode with the high input voltage?  I’ve only seen a handful of failures, and I would say that many more could see the 10V but not have a failure.  Is there a factor of time or some other variable involved here?  My current working theory is that we’ve damaged the components by applying too high an input voltage.

 

Here’s what I’m seeing for output on two different components:

  1. Component shows variable voltage proportional to about 80% of input voltage, up to 9V input.

  2. Component shows 1.1V output at 5V input; unknown if voltage is variable with input.

 

Any direction you could provide would be very helpful.

Gary Forgue