Custom mosfet model for LTSpice

Thread Starter


Joined Jun 7, 2015
Hello everyone,

In almost every electronics textbook, the drain current of a mosfet is been given by the quadratic equation


where k, W, L, Vt and Va are parameters based on the manufacturing process. The question is; how do I set these parameters in LTSpice?

It allows me to use only predetermined transistor models which don't have the parameters that I want and I am not even sure if the obey the above equation.


Joined Sep 9, 2010
Are you familiar with the LTspice group on Yahoo? A lot of experts over there. They may have the answer if you don't get it here.


Joined May 20, 2015
Model mos Level=1.
k=Kp, W=W, L=L, Vt=Vto and Va=1/Lambda.
When using four symbols NMOS4 and PMOS4 transistors can be set in their geometrical dimensions (W, L, AD, AS, PD, PS), and the multiplicity M. For example M=3, the three transistors in parallel.