I'm using an ESP8266 to control a dual relay module. As a good practice, and a longer life for the MCU, I wish to power it not using its vcc and gnd pins, but using its JDVcc.

Appreciate explanation whether a 5v input into JDVcc is valid and won't damage the module.


1 Answer 1


Using 5V as a supply to power a relay coils that are rated for 3V is not valid and it might damage the module.

  • \$\begingroup\$ A 3v coil is not suited for a 5v input. I know. But JDVcc transfers it directly as 5v? \$\endgroup\$
    – guyd
    Jan 7, 2021 at 17:47
  • \$\begingroup\$ Yes, JDVCC is directly the coil supply, so 5V is not suitable. \$\endgroup\$
    – Justme
    Jan 7, 2021 at 17:51

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