I tried to test the model of the TLP383 in ltspice which I downloaded from toshiba. TLP383

I added it as I always did with my models downloaded from the internet. But this time ltspice gives me the error:

Unknown SPICE device type "1" in "17f62b..."

So I wanted to ask if somebody also experienced something like this or if anybody got a working model of the TLP383?

Thank you for your help.

Best regards.

  • 1
    \$\begingroup\$ It's a PSPICE model not an LTSPICE model. Compatibility between them may be limited and may not extend to encrypted models, as "* Operation of this model has been verified only on the OrCAD." suggests. \$\endgroup\$
    – user16324
    Commented Mar 9, 2021 at 15:09
  • \$\begingroup\$ Yeah I had some PSPICE models which I still could even use with LTSPICE. This was my first with a encrypted model. I thought that "Operation of this model has been verified only on the OrCAD" means that it could also work with other SPICE programs. \$\endgroup\$
    – 3phase
    Commented Mar 9, 2021 at 15:18

1 Answer 1


You can't open a Pspice model in LTspice. I don't see any SPICE models other than the Pspice one in the linked site.

To elaborate, yes it's true that SPICE is SPICE and LTspice is perfectly fine with unencrypted models made in Pspice, but every Pspice model I've ever encountered has been encrypted. As is the case with this one--note how line 14 in the .lib reads **$ENCRYPTED_LIB.

  • \$\begingroup\$ LTspice is PSpice compatible, unless the model is encrypted (not by LTspice). \$\endgroup\$ Commented Mar 9, 2021 at 15:09
  • \$\begingroup\$ Well, yes, SPICE is SPICE, but every model I've ever seen that calls itself a "Pspice model" has been encrypted. \$\endgroup\$
    – Hearth
    Commented Mar 9, 2021 at 15:10
  • \$\begingroup\$ There are plenty Pspice models that aren't encrypted, but maybe not in this case (the page doesn't open for me). It's easy to open it up with a text editor and if it says "encrypted" (and it's not by LTspice), then it's a clear no. \$\endgroup\$ Commented Mar 9, 2021 at 15:13
  • \$\begingroup\$ Okay. Thank you for this fast answers! Now I learned something new again. \$\endgroup\$
    – 3phase
    Commented Mar 9, 2021 at 15:16
  • \$\begingroup\$ I will try to find a model which I can use as a alternative for the TLP383 to use in ltspice. \$\endgroup\$
    – 3phase
    Commented Mar 9, 2021 at 15:17

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