SIDAC LTSpice model

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busaboy

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Joined 2008
#1
Anyone have functional SIDAC spice models? The ones I have tried like below don't seem to work properly. They act similar to a bidirectional TVS diode versus a thyristor. I've tried old Intusoft and newer manufacturer models. All the DIAC models I have tried seem to work OK





**********
* Littelfuse, LP
* SIDACtor SPICE Models
* P0640SCLRP, DO-214, 64V, "C" Surge Rating,"L" ROSH,"RP" Reel Packing
*
* v1: Initial models, T. Chenoski, 10/01/2004
*
**********
**********
.SUBCKT P0640 1 2
* TERMINALS: MT2 MT1
QN1 5 4 2 NOUT OFF
QN2 8 6 7 NOUT OFF
QP1 6 8 2 POUT OFF
QP2 4 5 7 POUT OFF
DF 4 3 DZ OFF
DR 6 3 DZ OFF
RT2 1 7 0.05
RH 7 6 3
RH2 4 2 3
.MODEL DZ D (IS=321F RS=10 N=1.5 IBV=10N BV=64)
.MODEL POUT PNP (IS=321F BF=10 CJE=50P TF=0.1U)
.MODEL NOUT NPN (IS=321F BF=20 CJE=50P CJC=50P TF=0.1U)
.ENDS
**********
 
#2
See my model:

.SUBCKT P0640_AB 1 2
* TERMINALS: MT2 MT1
QN1 5 4 2 NOUT OFF
QN2 8 6 7 NOUT OFF
QP1 6 8 2 POUT OFF
QP2 4 5 7 POUT OFF
RT2 1 7 0.05
RH 7 6 3
RH2 4 2 3
.MODEL DZ D (IS=321F RS=10 N=1.5 IBV=10N BV=64)
.MODEL POUT PNP (IS=321F BF=10 CJE=50P TF=0.1U)
.MODEL NOUT NPN IS=321F BF=20 CJE=50P CJC=50P TF=0.1U
+ nBVcbo=3 BVcbo=64
.ENDS
 
#3
busaboy said:
Anyone have functional SIDAC spice models? The ones I have tried like below don't seem to work properly. They act similar to a bidirectional TVS diode versus a thyristor. I've tried old Intusoft and newer manufacturer models. All the DIAC models I have tried seem to work OK





**********
* Littelfuse, LP
* SIDACtor SPICE Models
* P0640SCLRP, DO-214, 64V, "C" Surge Rating,"L" ROSH,"RP" Reel Packing
*
* v1: Initial models, T. Chenoski, 10/01/2004
*
**********
**********
.SUBCKT P0640 1 2
* TERMINALS: MT2 MT1
QN1 5 4 2 NOUT OFF
QN2 8 6 7 NOUT OFF
QP1 6 8 2 POUT OFF
QP2 4 5 7 POUT OFF
DF 4 3 DZ OFF
DR 6 3 DZ OFF
RT2 1 7 0.05
RH 7 6 3
RH2 4 2 3
.MODEL DZ D (IS=321F RS=10 N=1.5 IBV=10N BV=64)
.MODEL POUT PNP (IS=321F BF=10 CJE=50P TF=0.1U)
.MODEL NOUT NPN (IS=321F BF=20 CJE=50P CJC=50P TF=0.1U)
.ENDS
**********
Click to expand...

These models do work for me. Are you sure the minimum hold current is observed in your circuit?

Jan
 
#4
jan.didden said:
These models do work for me. Are you sure the minimum hold current is observed in your circuit?

Jan
Click to expand...


I believe I am meeting the minimum current requirements. I have a thread over on the LTSpice site and Bordodynov agreed that the models don't work properly. I just tried his "new" model and it seems to work. I will breadboard up a test circuit and confirm.

Below is one of my comments:

"I have been designing with SIDACs since the 90's. I primarily use them in Datacom surge protectors, CAT5 etc. We normally tested the surge protectors using a curve tracer. There is no way the source Z of the curve tracer is low. The series R is >10K Ohms."
 
#5
bordodynov said:
See my model:

.SUBCKT P0640_AB 1 2
* TERMINALS: MT2 MT1
QN1 5 4 2 NOUT OFF
QN2 8 6 7 NOUT OFF
QP1 6 8 2 POUT OFF
QP2 4 5 7 POUT OFF
RT2 1 7 0.05
RH 7 6 3
RH2 4 2 3
.MODEL DZ D (IS=321F RS=10 N=1.5 IBV=10N BV=64)
.MODEL POUT PNP (IS=321F BF=10 CJE=50P TF=0.1U)
.MODEL NOUT NPN IS=321F BF=20 CJE=50P CJC=50P TF=0.1U
+ nBVcbo=3 BVcbo=64
.ENDS
Click to expand...

Thank you.. thank you. This is a much more promising model. Thanks for also cross posting on the LTSpice site.

I don't understand how these models persisted all this time. They date back to the 90's from Intusoft. I haven't used Intusoft Spice since the late 80's or early 90's. Waay too long to remember....
 
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