Dave,

Were they getting hotter than expected?

Sean


On Tue, Jan 3, 2017 at 12:35 PM, Van Horn, David <
david.vanhorn@backcountryaccess.com> wrote:

> Maybe.
>
> I had a case where mosfets in an SMPS were failing.  Fastest scope we had
> indicated 52V across a 60V part.  Vendor said they tested the transistors
> to 70V.
> However...  When I changed out the mosfet for a 100V part the transient
> significantly exceeded the 70V number.
> The transistor was going into avalanche so fast that I couldn't scope it.
>
> Absence of evidence is not evidence of absence.
>
>
>
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