SparkFun will be closing early at 3:30 Friday 5/27 and remain closed Monday for Memorial Day (5/30). Orders placed after 2pm MT on Friday (5/27) will process and ship out on Tuesday (5/31).

Member #428383

Member Since: April 12, 2013

Country: United States

  • The junctions in TECs are of Fe strips soldered on the opposite ends of the semiconductor cubes and are held in place by the ceramic plates.

    The Thermal expansion becomes a major factor when you try to maintain large temperature differences. The Junctions of cold side shrink and the junctions of hot side expand. The unit will suffer a mechanical failure way before T(hot) reaches the melting point of the semiconductor.

    Since it’s a series of diodes by definition (mostly 127), a single failed junction renders the TEC unit useless.

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