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Temperature time constant of chip capsule epoxy?

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MT:
Whats the temperature time constant of chip capsule epoxy? Particularly SOT323 and SC70 ie SOT23-6?

Circlotron:
"Time constant" is not the right term. Doesn't make sense. Can you describe it differently?

MT:
Updated!  :)

DaJMasta:
Thermal conductivity/resistance?  Dielectric constant?

If it's the thermal resistance, such as junction to ambient, it's usually specified in the chip's datasheet, as it will differ somewhat with the die and construction - TI's app note SLVA937 outlines how differing internal constructions can play a big difference in effective heat dissipation.

If it's dielectric constant, this is already factored into the specifications of the device and only very rarely has significant interactions with external parts, but there are some guidelines floating around for approximate/likely values.  Perhaps another free reference available online (which also addresses some thermal resistance properties of materials used) is Intel's "Physical Constants of IC Package Materials" which is chapter 5 of the 2000 Intel Packaging Databook.

T3sl4co1l:
Ballpark 10s to 1000s of milliseconds.  Yup, see the thermal transient response curves. :)

Tim

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