>Hi Technetters

>I sent this a couple of weeks ago and had no responses, so after the
>previous few days of technet I thought I'd try again.
>
>Previous message


>Has anyone experienced any failures of TL783 series voltage regulators
>manufactured by Texas Instruments?  I have come across a number of devices
>that have shut down unexpectedly.  Failure analysis has indicated a higher
>than normal contact resistance within one area of the internal circuit that
>causes the spurious shutdown to occur.  Once shut down, devices will remain
>in this condition indefinitely, whether powered or not, at least until the
>junction temperature is raised above 60-70F for a period of time. i.e.
>failure occurs when the temperature drops. After recovery, the devices
>appear to function correctly and do not shut down if the temperature is
>reduced again.
>
>I have found it possible to keep failures in the "failed state" but only
>with the use of cold conditions!!!
>
>NB Failures do occurabove the minimum specified operating temperature of
>the
>device.
>
>Any information on similar failures or faults would be appreciated.
>
Best Regards
>
>Ian Boyton
>
>
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