Identifying The Pins

[Ron Hubbard]

I bought a SCR from Mouser that didn't have any pin-out. Are all SCRs
the same in terms of where the gate and the other pins are located or
do they vary from SCR to SCR?

Ron

 

[Noway2]

Does the part have a datasheet that would show you the pins? Also,
look on the manufacturer's web site for an additional document such as
packaging information. I have come across a couple of parts like this,
where the pin information wasn't clear. If all else fails, call the
manufacturer tech support. Also, sometimes the pin information is
contained in very small print on the bottom corner of the last page or
some equally apparent location.

 

[Ron Hubbard]

No joy with a datasheet, and nothing in the packaging, but beside one
pin is A4 and beside the other pin is 43-- any significance?

Ron

 

[ehsjr]

No joy with a datasheet, and nothing in the packaging, but beside one
pin is A4 and beside the other pin is 43-- any significance?

Ron

It might help if you posted the Mouser part number.
We don't even know which package style you've got.

You can test the thing to find out which pins are which.

Wire up this circuit:

+12 ---+---[LED]---[470R]------A
| __
+-------[470R]---o o---G

/
Gnd --------------------o o---C

When the SCR is connected Anode to A, Cathode to C, and Gate to G,
it will behave as an SCR should. You will not hurt it if you
mis-connect it.
Ed

 

[Noway2]

Unfortunately the designations don't strike any bells with me. I also
ran this by one of my co-workers who has worked with a lot of different
SCRs and they didn't seem to mean anything to him either.

Since you bought it from mouser, do you have the manufacturer and
manufacturer's part number?

 

[bg]

Use an ohm meter - with the cathode negative and the gate positive it
measures like a forward biased diode. All other combinations are infinate.
bg
Ron Hubbard wrote in message

 

[Ron Hubbard]

Let's see; the part number is 511- TYN408G and the mfg. P/N isn't much
different, it's TYN408GRG.

Ron

 

[Ron Hubbard]

Thanks, Ed.

Ron

 

[Ron Hubbard]

It's been so long since I've used a SCR in a project, I forgot about
that. Thank's for the reminder.

Ron

 

[Noway2]

This part doesn't even show up on the manufacturers site!

I did locate this link, however.
www.st.com/stonline/products/literature/ds/3219/tyn410.htm

It will take you to the datasheet for ST's standard SCRs. I came
across this when I made the search more generic and found a TYN410.

It is possible that part of the problem is that the tyn408g has been
made obsolete.

 

[ehsjr]

Let's see; the part number is 511- TYN408G and the mfg. P/N isn't much
different, it's TYN408GRG.

Ron

 

[Ron Hubbard]

Thanks for all the help, folks.

Ron