High current, low henry inductors (surface mount)

Hello
We need to filter output ripple at frequency 3MHz from the output of a VTM power module. Its 65A output (1V5).
We need inductors of 20nH and less.
Do you know of people that make these and have off the shelf?…but maybe we need bits of flat copper braid soldered though torroid rings. (it must be surface mount)

A 20nH 65A inductor is basically a two inch piece of 6awg wire in free space. Are you sure you're not off by an order of magnitude?

Coilcraft makes many smt inductors with very high Irms, but not below 80nH.

thanks, when you say "2 inch" do you mean go and return form say the outside of a 2inch circumference of a circular shape...or go and return are 2 inches side by side?
...ie what is the area in between go and return of that 2 inches?

I meant a straight wire in free space, with no return path. The point is, that sort of inductance is easily formed by interconnects between components. A power component large enough to carry that much current is going to have nearly that much inductance even without a coil or a core. It's a strange request for the same reason a 1pF capacitor would be a strange request (for a power electronics application).

I presume the post is about building a real output filter. There won't be a problem of putting in a higher choke inductance than calculated, as long you don't run into resonance problems. So you'll primarily look for high current chokes suited for 65 A and the lowest aviaiable Rdc value.

A "flat copper braid soldered though toroid rings" would only work with a very low µr material, e.g. powder core. Better go for ferrite choke with air gap.

Thanks, I appreciate that the inductor value is small, but if you look at the schematic on page 9 of the attached document, it shows a 100nH inductor doing output LC filtering at the output of a 200W SMPS.
I actually ran this on the bench with vin=48vdc and vout=36vdc and 100w load and the ripple voltage upstream of this inductor is 700mV pkpk and just 30mV pkpk downstream of this inductor….which shows that for high frequency SMPS like this, very low inductor values have their merits.

The SMPS of the attached page 9 runs at 1MHz, but the one that we are wanting to filter now, has a 3MHz output ripple frequency, and is a vicor VTM module with vin=36vdc and vout =1v5 and iout=65A.....so i was thinking of a very low henry value inductor.

Page 5-2 of the following has a formula for PCB trace inductance, and it comes out very low for say a 30mm long trace of width 10mm and PCB thickness of 1600um. (over a ground plane & 140um thick copper)
https://www.ti.com/lit/ml/slyp173/slyp173.pdf

..Trace inductance comes out at less than 0.97nH for that....

..This corresonds with what you get from this PCB trace inductance calculator...
https://technick.net/tools/inductance-calculator/wide-trace-over-ground-plane/

..though in truth, the exact geometry should really be considered, as those calculators seem to presume an infinite ground plane