THERMAL BARRIER FOR DOWNHOLE FLASKED ELECTRONICS

Apparatus including an assembly associated with a downhole tool and configured to thermally isolate a thermally sensitive component. Components of the assembly include a thermal housing; a chassis interior to the thermal housing; at least one thermally sensitive component mounted on the chassis; and a thermal isolation support connecting the chassis to the tool. The thermal isolation support comprises an elongated thermal isolator having a first end and a second end opposite the first end, the thermal isolator connected to the tool at the first end and connected to the chassis at the second end, and a heat sink thermally coupled to the elongated thermal isolator at the second end. The second end of the elongated thermal isolator may comprise the only points of thermal coupling between the heat sink and the components other than the heat sink.