I'm adding a diode model, SMS7621-079, to the LT Spice standard.dio file. My diode data sheet shows Spice parameter Cjo = 0.1 pF, but the parts have a typical capacitance of 0.22 pF. I assume the extra capacitance is the package, which wouldn't behave like Cjo.
I don't see an obvious place, in the model script, for the package c. There are some "sidewall" params, but I don't know how they behave. I guess I could add discrete caps to my schematic, but that's inelegant.
There appears to be no way to specify diode inductance! I'd have to do that outboard, too.
(I'm designing a diode 2-input AND gate! I never took any digital design courses, but I recall seeing a diode AND on a blackboard as I walked pass the class in the hallway. I'd use the Hittite part, but it's almost $600.)