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Specifically, I do not understand how to use the graph on the right. The full datasheet can be found here


1 Answer 1


The graph on left is showing you power dissipation as a function of load current for different duty cycles; full-on and 50%. The right hand graph is showing you for different thermal resistances (each line) what Tcase_max will be for a given ambient temperature. The datasheet is somewhat ambiguous on how those thermal resistance characteristics were determined, I imagine it depends on the heatsink you use, with 6C/W being no heatsink.

  • \$\begingroup\$ What is Tcase_max? \$\endgroup\$
    – wesanyer
    Aug 26, 2016 at 14:27
  • \$\begingroup\$ @wesanyer Max case temperature of the SSR. \$\endgroup\$ Aug 26, 2016 at 14:28
  • \$\begingroup\$ Max allowable or max temperature it will reach? \$\endgroup\$
    – wesanyer
    Aug 26, 2016 at 14:47
  • \$\begingroup\$ I believe max it will reach. The datasheet does clearly state that the max temperature is 100C. \$\endgroup\$ Aug 26, 2016 at 14:47

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