Can R-783.3-0.5 DC-DC converter be used with 5V input?
The input rating of the R-783.3-0.5 is 4.75V up to 32V.
So yes.

However, transient response from/to 100% &lt;-> 50% and 10% load will not meet the given specification of ±75mV and ±100mV. For this 5.5V is required.

In other words, you might shortly get less than 3.2V or more than 3.4V if you have large load steps when Vin is below 5.5V.



If the 5V is from USB, I'd recommend not using this converter, since USB is allowed to go as low as 4.40V within spec.