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** ZENER DIODE ** 
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*** You may change the Zener breakdown voltage by editing the parameter bv

.model zener1 diode
+ bv = 5.0
+ cj = 9.353E-14
+ level=1
+ is=1e-20 n=0.2118 ibv=1e-3
+ rs=10 tcv=-1.600e-03 eg=0.1 xti=0 
+ mj=0.3552 pb=0.8144
*