openSDA USB connection

[ankan_creatara]

Hello everyone,

I am back with some other doubts. Kindly take out some time to help me out.

I am attaching the screenshot of the opensda schematic input via USB. I have the following doubts:
1. What are these L1 and L2? I believe these are inductors. If yes, then why is its value in OHMS?
2. Why are these L1 and L2 used and connected? I understand the use of bypass capacitors along with the power source; but I couldnot figure out the use of these L1 and L2.
3. Also, kindly help me out in figuring the use of D17, D18 and D19 in the circuit.

ankan_creatara_0-1665569076916.png
Kindly help me out in understanding the schematic.

Thank you for your time.

[davidtosenovjan]

1) L1 and L2 are ferrite beads and 330Ohm is an impedance at 100MHz. If you want to see specific type, for instance following:
MPZ1608S331A

2) https://en.wikipedia.org/wiki/Ferrite_bead

3) It is ESD protection diode.

https://www.nexperia.com/products/esd-protection-tvs-filtering-and-signal-conditioning/esd-protectio...