Equivalent parts same LTSpice model ?

[ginetto61]

Hi ! i have a weird question
Should equivalent parts have a very similar (if not identical) LTSpice model ?
i am asking because (at least at sim) the part rh117h shows very impressive performance when used as unity gain buffer
As this part is not widely available i have tried the model of what i thought were an equivalent part, the lt317a also present in LTSpice default library
It does not work in a same circuit So my conclusion is that they are not equivalent at all
Am i correct ?
Thanks a lot and have a nice day
gino

 

[ginetto61]

i have found a working schematic I had to increase the output current but it seems to work now

 

[Ray Waters]

Should equivalent parts have a very similar (if not identical) LTSpice model ?
i am asking because (at least at sim) the part rh117h shows very impressive performance when used as unity gain buffer
As this part is not widely available i have tried the model of what i thought were an equivalent part, the lt317a also present in LTSpice default library

LTspice 24 has a built-in model for the RH117H. Attached is your original .asc file with the RH117H substituted for the LT317A. Note that the original LTspice IV did not include this model so if you are still using that old unsupported LTspice version you might want to consider upgrading.

 

[ginetto61]

Hi thank you for the very kind and valuable advice and sharing of information
I am using the latest version of Ltspice already
Fwiu a model should work just fine for a component and all its equivalents ?
I made a wrong assumption that rh117h and the lt317a were equivalent
For both there are models in the default library
Now the question is how a generic lm317 is equivalent to a lt317a
lm317 are very easily available anywhere at silly low prices