I've been looking for a solid state relay that can switch 240V from a 3.3V signal.

Looking at DigiKey, with a very large selection, I'm not sure how to filter my search (screenshot attached). How do I interpret the "Voltage Input" and "Voltage Load" criteria compared to the coil and switching voltage for regular relay ? (screenshot attached)

The names seem pretty self explanatory but I'm surprised there aren't any 3V DC controlled SSRs - hence the uncertainty

enter image description here

  • \$\begingroup\$ It looks to me that most or perhaps all of the ones that your search would yield will switch 240 V with a 3.3V signal. Pick one or several, download the spec sheets and see how the input voltage specification is described. \$\endgroup\$
    – user80875
    Aug 5, 2020 at 20:21

1 Answer 1


3-32 is a very common input range, which means it will work with 3.3V drive.

If I search on "In stock", output type: AC, AC-DC or AC zero cross, and all with minimum input voltage up to 3V, and "output current" min 5A max 35A I get 122 results.

  • \$\begingroup\$ thanks ! when you say 3-32, is that the same as 3 ~ 32 DC ? \$\endgroup\$
    – kmn
    Aug 5, 2020 at 20:46
  • \$\begingroup\$ Yes, my tilda was temporarily out of service. \$\endgroup\$ Aug 5, 2020 at 20:50
  • \$\begingroup\$ No worries thanks ! I misread the ~ myself... even on the data sheet and the component itself it is 3-32 so you were right \$\endgroup\$
    – kmn
    Aug 5, 2020 at 20:51
  • \$\begingroup\$ found this one thanks to you : digikey.fr/product-detail/fr/sensata-crydom/D2W203F/CC1118-ND/… Looks like a good candidate \$\endgroup\$
    – kmn
    Aug 5, 2020 at 20:56

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