MOS - Width and Lenght dimensions in Spice Simulation

[tonyoxy]

Hi everyone,

I'm trying to simulate a simple electric circuit using spice with a common MOS insite (i.e. ZVN4424Z - SOT89 N-CHANNEL ENHANCEMENT MODE VERTICAL DMOS FET).
The supplier Zetex (https://www.diodes.com/) give as the MOS spice model.
The question is:

I'm quite sure (see in the follow) that the model doesn't consider the actual size of the MOS (i.e. the width W and the lenght L).

Is it possible to derive these parameters from the datasheet? any suggestions?

Here I report the Spice Model suggested from ZETEX. In my opinion it is evidente that the dimension W and L are not considered into the model.

Marco


*
*Zetex ZVN4424Z Spice Model v1 Last Revised 28/7/08
*
.SUBCKT ZVN4424Z 3 4 5
*------connections-------D-G-S
M1 6 2 8 8 N4424AM
M2 6 2 8 8 N4424AMS
RG 4 2 35
RD 3 6 3.6
RS 8 5 0.15
RL 3 5 240E6
D1 5 3 N4424AD
Egs2 13 8 2 8 1
Eds1 14 8 6 8 1
C1 2 8 145E-12
C2 2 3 11E-12
C3 15 14 235E-12
C4 16 8 226E-12
S1 2 15 14 13 SMOD1
S2 13 15 14 13 SMOD2
S3 16 13 13 8 SMOD3
S4 16 2 13 8 SMOD4
.MODEL SMOD1 VSWITCH RON=.001 ROFF=100 VON=1 VOFF=2
.MODEL SMOD2 VSWITCH RON=.001 ROFF=100 VON=2 VOFF=1
.MODEL SMOD3 VSWITCH RON=.001 ROFF=100 VON=-3 VOFF=-4
.MODEL SMOD4 VSWITCH RON=.001 ROFF=100 VON=-4 VOFF=-3
.MODEL N4424AM NMOS VTO=1.3 IS=1E-15 KP=0.85
+CBD=66.2E-12 PB=1
.MODEL N4424AMS NMOS VTO=.86 IS=1E-15 KP=0.0085
+CBD=.66E-12 PB=1
.MODEL N4424AD D IS=5.516E-13 RS=.2084 N=1.0078
.ENDS ZVN4424Z