Will a power spike travel to parallel circuits?

I'm powering a relay and a device with an IC from the same power supply (12VDC), and they are wired in parallel. Will the spike caused by the coil when the relay activates potentially result in a spike in the parallel circuit? I know that if the relay was actually wired in series with an IC or transistor, I... show more I'm powering a relay and a device with an IC from the same power supply (12VDC), and they are wired in parallel. Will the spike caused by the coil when the relay activates potentially result in a spike in the parallel circuit?

I know that if the relay was actually wired in series with an IC or transistor, I would need to put a diode backwards across the coil leads, but is this necessary when there is nothing wired in series with the relay that could be damaged?
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