***********************************************************************
***********           PANJIT International Inc.             ***********
***********************************************************************
*Apr 23, 2021                                                         *
*                                                                     *
*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-B4V3-AU A K 
.param
+vc0 = 3.346e-12		vc1 = 7.516e-10		vc2 = 1.400			vc3 = 2.585e-9		vc4 = 9.775
+tc1 = 7.681e-3		tc2 = 5.721e-3		tc3 = 4.881e-3		tc4 = 1.321e-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 = 3.085e-15		   n = 1.072		  rs = 4.427e-1
+ibv = 1.0e-3			 nbv = 4.0			  bv = 4.3
+ikf = 1.414e-1
***** capacitance parameter *****
+cjo = 1.549e-10		   m = 3.878e-1		  vj = 8.568e-1 
+ fc = 0.5
***** temperature coefficient *****
+tnom = 25			  eg = 1.134		 xti = 3
+trs1 = 9.525e-4		trs2 = 7.085e-6		tikf = 6e-3
+tbv1 = -2.059e-4		tbv2 = -9.152e-9	
.ends BZT52-B4V3-AU
*$
