Datasheet

As you can see from the last two graphs, the dropout voltage of the low-current 9 V and 12 V versions
(D24V3F9 and D24V3F12) spikes as the output current nears the 300 mA limit.
LC Voltage Spikes
When connecting voltage to electronic circuits, the initial rush of current can cause voltage spikes that
are much higher than the input voltage. If these spikes exceed the regulator’s maximum voltage (42 V),
the regulator can be destroyed. In our tests with typical power leads (~30″ test clips), input voltages
above 20 V caused spikes over 42 V. If you are connecting more than 20 V or your power leads or
supply has high inductance, we recommend soldering a 33μF or larger electrolytic capacitor close to
the regulator between VIN and GND. The capacitor should be rated for at least 50 V.