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Can be this relay and more precisely SIL03-1A72-71D variant controlled directly from RPi?

The data sheet specifies coil resistance of 500 Ohm which at 3.3 V voltage gives 6.6 mA control current, which is well within 16 mA limit.

Am I correct?

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From the datasheet I come to the same conclusion. It should work. Driving this relay from digital logic interface seems to be the intended use case.

I am however not clear if the flyback diode is included for this particular model or if it is optionally. If it is not allready include you must provide it externally otherwise damaging the GPIO pin is indeed a real danger.

  • Does it include a flyback diode internally? I didn't understand what the datasheet was saying. – joan Nov 13 '16 at 21:33
  • That is indeed a question that came to me too, @joan. – Ghanima Nov 13 '16 at 21:35
  • Those relays come in a lot of different types and options. There are versions with and without internal flyback diode. – Janka Nov 13 '16 at 22:49
  • From other data sheets of this manufacurer I learned that the last 'D' happen to mean "diode", but I won't leave it to the chance of course, and verify that by testing it with power supply. The only bothers me, how I know where is pin 1. Put it wrong way - RPi will be destroyed by short curcuit to ground, before it gets the chance to be destroyed by EMF... – Andrey Pro Nov 14 '16 at 12:47
  • @AndreyPro there's a notch in the package to indicate the orientation (presumably pin 1 though the datasheet is not clear about that). If you have the model with integrated diode the pin numbering can be easily verified. – Ghanima Nov 14 '16 at 13:07

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