In need of a component

Question

I need a Programmable Unijunction Transistor to build a circuit for school and I can't find one. Please help!

Answer 1

Try these from my  Version 10 Database:
.SUBCKT 2N6027 1 2 3
*      Model Generated by CZ LAB     *
*           April 20, 2001           *
*   Copyright(c) On Semiconductor    *
*         All Rights Reserved        *
*Commercial Use or Resale Restricted *
*Programable Unijunction Transistor
*MODEL FORMAT: PSpice
*       anode  gate  cathode
*node:    1      2      3
Q1 2 4 3 NMOD
Q2 4 2 1 PMOD
.MODEL NMOD NPN(IS=5E-15 VAF=100 IKF=0.3 ISE=1.85E-12
+ NE=1.45 RE=0.15 RC=0.15 CJE=7E-10 TF=0.6E-8
+ CJC=2.2E-10 TR=4.76E-8 XTB=3)
.MODEL PMOD PNP(IS=2E-15 VAF=100 IKF=0.3 ISE=1.90E-12
+ NE=1.5 RE=0.15 RC=0.15 CJE=7E-10 TF=1.6E-8
+ CJC=2.2E-10 TR=5.1E-8 XTB=3)
.ENDS
.SUBCKT 2N6028 1 2 3
*      Model Generated by CZ LAB     *
*           April 20, 2001           *
*   Copyright(c) On Semiconductor    *
*         All Rights Reserved        *
*Commercial Use or Resale Restricted *
*Programable Unijunction Transistor
*MODEL FORMAT: PSpice
*       anode  gate  cathode
*node:    1      2      3
Q1 2 4 3 NMOD
Q2 4 2 1 PMOD
.MODEL NMOD NPN(IS=2E-15 VAF=100 IKF=0.3 ISE=2.5E-12
+ NE=1.6 RE=0.15 RC=0.15 CJE=7E-10 TF=0.6E-8
+ CJC=2.2E-10 TR=4.76E-8 XTB=3)
.MODEL PMOD PNP(IS=22E-15 VAF=100 IKF=0.3 ISE=1E-12
+ NE=1.7 RE=0.15 RC=0.15 CJE=7E-10 TF=1.6E-8
+ CJC=2.2E-10 TR=5.1E-8 XTB=3)
.ENDS
You might want to look to see if these components are already in your database. Look under TRANSISTORS in the database. These are the only 2 in mine.
http://www.duncanamps.com/spicemiscsemi.html also has these same 2 but there are from different manufacturers. You can look at these also if you want.
Kittmaster's Component Database
http://ni.kittmaster.com
Have a Nice Day