.MODEL RB521S-40 D
+ IS=899.28E-9
+ N=1.0463
+ RS=.82562
+ IKF=18.583
+ XTI=2
+ EG=.69
+ CJO=27.136E-12
+ M=.483
+ VJ=.40883
+ BV=40
+ IBV=30E-6
+ TT=9.8103E-9