Thanks all for your replies. Every post is being very useful for me.
Ok. I'll add the capacitor to the input, thanks for your explanations. But should this capacitor resolve the problem? What I need to get is my circuit to support this inductance value at the input. I clear up this question answering to FvM post:
Hi FvM:
The diode is a simple reverse power voltage protection. The inductance is not really part of my circuit. The first problem appeared when I was doing some conducted emissions tests. I had the circuit connected to the LISN and after some attempts the circuit started to fail (communications). At the end the circuit failed completed. The reason, it was cooked (every IC was damage). As you all will know, the LISN has an output impedance of 50ohms+50uH. So I started to investigate around this inductance value. I decied to include this in my circuit looking for the same effect and I found it. So now, how can my circuit accept this inductance to the input? I've tried with a de-coupling capacitor (47uF) but the problem continues.
Orson, thanks for your advice. In the complete circuit I've a varistor of 33V from V+ to gnd before the diode as main protection.
Lurchman, very interesting comments. I didn't know about this behaviour of the 7805. I'll take into account, although I suspect that my current problem is not related with this issue.
Brian, thanks for explanations about what important are the capacitors for the regulator.
Regards.