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Which are the parameters I should looking for when picking a flyback diode to be placed across a generic coil, such as a relay? That is: a coil with plain on/off functionality, for example a 24VDC ...
#3: Post edited
by
Lorenzo Donati
·
2023-08-09T21:39:22Z (over 1 year ago)
Retagged.
#2: Post edited
by
Lorenzo Donati
·
2023-08-09T21:37:33Z (over 1 year ago)
Retagged.
#1: Initial revision
by
Lundin
·
2021-01-11T11:25:56Z (almost 4 years ago)
What should be considered when picking a flyback diode?
Which are the parameters I should looking for when picking a flyback diode to be placed across a generic coil, such as a relay? That is: a coil with plain on/off functionality, for example a 24VDC relay coil with 700mW max coil power. I assume that these are the important ones: - *Power dissipation*. According to [this](https://electronics.stackexchange.com/a/320542/6102) - together with the total resistance across the coil. - *Reverse voltage*. Ensuring that that it can handle the input voltage to the coil. - *Repetitive peak forward current*. I assume this is what's relevant the for EMF current, rather than continuous forward current. Q1: Is the above correct? Anything missing? Q2: What about using TVS diodes as flyback? They are a bit more expensive, but multi-purpose since they could also help with other EMI not related to the coil EMF. Any technical drawbacks?