LTSpice

SCR and TRIAC are in the symbol (*.asy) libraries. The others may exist but I couldn't find them in a quick eyeball scan.

But you can draw your own symbols, and Spice models are easy enough to find by surfing the web. ...Jim Thompson

By the way: there is a very well supported LTSpice-Group at yahoo! snipped-for-privacy@yahoogroups.com

peter

Did you look through the 100+MB of Alex Bordodynov's models?

I only could download one set, not the larger set, so couldn't peruse.

I've seen that name on the LTspice list. Do you have a link to his site?

As for models, I have 6.88 GB (227,943 files) of models, about 80% foundry device-level stuff, the rest discrete components and manufacturer's chip models ;-)

Unijunction transistors are in low usage. I don't know of a good model. ...Jim Thompson

Yep. Good group. ...Jim Thompson

-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

His models usually are accurate and have conversion speed enhancements. He supplied two links, circa July 5, 2013, posted to the LTspice group, which I trashed after downloading each. Big mistake!

LTspiceIV.zip is 37MB of 'tiny' little .asc files so you have an idea how many models are in there. LTSPICE.DOC is 67MB and dialup download took HOURS!!! only to find out today that when unzipping, comes up 'corrupted' download again!

Thanks. That will allow me to find it. As you know, I keep a record of everything... even an LTspice list directory "Pre_2013" ;-)

Found it. How do I download, it's all in Russian, and I can't get the download to start :-( ...Jim Thompson

Here you go...

Kill the pop-up on the lower left, then you can download. ...Jim Thompson

Wow! What a collection! ...Jim Thompson

That's the SMALLEST one! Did you find the larger one?

No. Do you have that link?

I didn't see the .DOC file. What does it have in it? ...Jim Thompson

Now if I can just download that cake !!

Thank you for sharing Jim. Here's a more Anglo friendly link.

Here's something to fret over, compare Unijunction models, wonder which is real...

...Jim Thompson

Probably neither--this is SPICE we're talking about. ;0

I've used PUTs (2N6028) in laser interlocks, where I needed to be sure that there wouldn't be any weird behaviour on power-up or with transients.

BTW kudos for working to pass stuff along to the next generation. Now all you have to do is start writing for real.

Cheers

Phil Hobbs

I suspect the MicroSim/Motorola/THYRYSTR.lib is pretty close. It's certainly complex enough ;-) ...Jim Thompson

After some more head-scratching, and dumping the ancient single junction (Unijunction) device and looking only at the "PUT" (4-layer device), the _only_ two transistor model makes sense...

• .SUBCKT 2N6027DK 1 2 3 .SUBCKT 2N6027DK 2 1 3 ; B2 E B1

• RB=10 RE=0.5 RC=0.5 CJE=3.5E-11 VJE=0.75 CJC=1.1E-11 VJC=0.75 TR=4.76E-8
• TF=16N VJS=0.75 ) .MODEL PMOD PNP(IS=2E-15 VAF=100 IKF=0.005 ISE=1.9E-12 RB=10 RE=0.5
• RC=0.5 CJE=3.5E-11 VJE=0.75 TF=1.6E-8 CJC=1.1E-11 VJC=0.75 TR=5.1E-8
• TF=16N VJS=0.75 ) .ENDS 2N6027DK

What caught my eye was unusually low IKF (50x smaller than a 2N2222) for a discrete bipolar device... and unusually high ISE (10x that of a

My bet is I will be able to relate those parameters to peak, valley and hold-off currents.

So a "PUT" amounts to a special case of an SCR structure

Fun stuff!. ...Jim Thompson

IIRC the gate is opposite polarity to an SCR, but then it's over 15 years since I used one.

Cheers

Phil Hobbs