Thermal cycle detectors

A thermal cycle detector, comprising:

• a first temperature reservoir including a plurality of transistors;
• a second temperature reservoir including a plurality of transistors;
• a first thermal barrier disposed between the first temperature reservoir and the second temperature reservoir;
• and
• a second thermal barrier disposed between the first temperature reservoir and a temperature sensing location.

An assembly, comprising:

• a package;
• and
• a thermal cycle detector at least partially within the package, including:
• a first temperature reservoir including a first transistor,
• a second temperature reservoir including a second transistor,
• a first thermal barrier disposed between the first temperature reservoir and the second temperature reservoir, and
• a plurality of first electrical conductors spanning the first thermal barrier.