***********************************************************************
***********           PANJIT International Inc.             ***********
***********************************************************************
*Nov 22, 2019                                                         *
*                                                                     *
*This SPICE Model describes the characteristics of a typical device   *
*and does not respresent the specification. Designer should refer to  *
*the same type name data sheet for specification limits.              *
***********************************************************************
*$
.subckt BZT52-B4V7S-AU A K
.param
+vc0 = 7.166e-11	 vc1 = 4.053e-10	 vc2 = 1.000		 vc3 = 5.651e-10		 vc4 = 9.8
+tc1 = 1.362e-2		 tc2 = 1.088e-2		 tc3 = 4.936e-3		 tc4 = 1.715e-3		   
.func irpwr(v) {(vc0+vc1*v**vc2)*(1.0+tc1*(temp-25)*exp(tc2*(temp-25)))+(vc3*v^vc4)*(1.0+tc3*(temp-25)*exp(tc4*(temp-25)))}
d1 A K zener
g1 K A value = {irpwr(v(K,A))}
.model zener d
***** flag parameter ***
+level = 1   
***** dc model parameter ***
+ is = 7.594e-16	   n = 1.017		  rs = 4.523e-1		ikf = 8.678e-2
+ibv = 5e-3		 nbv = 5		  bv = 4.7
***** capacitance parameter ***
+cjo = 1.446e-10	   m = 4.052e-1		  vj = 8.936e-1
+ fc = 0.5                      
***** temperature coefficient ***
+tnom = 25		  eg = 1.160		 xti = 3
+trs1 = 8.973e-4	trs2 = 7.361e-6		tbv1 = 1.182e-5		tbv2 = -1.503e-7		tikf = 2.395e-3
.ends BZT52-B4V7S-AU
*$
