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'[EE:] Looking for SCR...'
2003\09\02@112707 by Jim Tellier

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Hi all...
 Since I've rarely needed to use an SCR in a design, I'm not saavy re:
which parts are
the most-commonly-available (i.e. easiest to find) "standards".  Perhaps
someone could
suggest a device that can handle 300mA continuous, 500mA peak current, @5V.
I'd hope to find something like this in a TO-92 pkg, but I could go larger
if need be.
Thanks for any ideas!
Jim

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2003\09\02@182544 by Kevinhoward

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Hi Jim,
      you could try the 2N5060 Rated at 30v  0.8A RMS 200ua gate current or
the 2N5061 which is higher voltage (60V)

Regards,

Kev

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2003\09\03@172911 by Jim Tellier

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> Kev wrote:
>        you could try the 2N5060 Rated at 30v  0.8A RMS 200ua gate current
or
> the 2N5061 which is higher voltage (60V)
>
I just found an NTE5400 which has same spec as 2N5060...  tried it in my
design,
but unfortunately I think I may have smoked a couple of them!   I misread
the 200uA
gate current spec (thought I was seeing mA :^(  ... so didn't use any
current limiting
resistor on the gate.   With 0.25V+ on the gate, I'd have expected to be
able to cause
the device to "latch", but I'm not seeing any current at all.  Would you
agree, "it's
dead, Jim!"?  BTW, I'm using these in a pure DC context, to programmatically
latch an LCD backlight "ON".   (Since I couldn't *dedicate* a port pin to
that function,
I'm just combining some pins' modality to determine when the backlight
should be
On or Off).
Thanks for your suggestion!
Jim
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2003\09\03@174629 by Spehro Pefhany

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At 02:29 PM 9/3/2003 -0700, you wrote:
> > Kev wrote:
> >        you could try the 2N5060 Rated at 30v  0.8A RMS 200ua gate current
>or
> > the 2N5061 which is higher voltage (60V)
> >
>I just found an NTE5400 which has same spec as 2N5060...  tried it in my
>design,
>but unfortunately I think I may have smoked a couple of them!   I misread
>the 200uA
>gate current spec (thought I was seeing mA :^(  ... so didn't use any
>current limiting
>resistor on the gate.   With 0.25V+ on the gate, I'd have expected to be
>able to cause
>the device to "latch", but I'm not seeing any current at all.  Would you
>agree, "it's

No, you'll need more like 1V to get any current to flow into the gate,
more at lower temperatures (roughly a diode drop). Of course you've got
to reduce the anode current down fairly low (maybe 1mA, look at the
datasheet) to get it to turn off.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speffspamspam_OUTinterlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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2003\09\03@193314 by Kevinhoward

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Hi Jim,
            Depending on the manufacturer/grade/type  the gate trigger
current will vary so you could try a 47k pot in series with the gate and adjust for
reliable trigger{10k?} (For the 2N5060/1 You will need approx 0.8V-1.2V at
the gate assuming cathode is at 0Volts with respect to the trigger voltage to
reliably trigger the SCR)


Ideally consult the manufacturers data sheet for full specs! (anti flame
line!)

I will send you the 2n5060/1 data sheet off list which I hope you find
useful.

best regards,

Kev



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2003\09\03@193318 by Jim Tellier

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Spehro Pefhany wrote:
> No, you'll need more like 1V to get any current to flow into the gate,
> more at lower temperatures (roughly a diode drop). Of course you've got
> to reduce the anode current down fairly low (maybe 1mA, look at the
> datasheet) to get it to turn off.
You know, after I wrote that last post, the thought did occur to me that I
might need to pop up over the ~0.7V "diode breakdown" threshold to get
the "gate to open"... but when I noted that the MAX Gate Trigger voltage
spec is 0.8V (and there is no Min value spec'd) I guess I assumed that
*any* +V > 0 would do it.  I'll go back and characterize it a bit, and see
what I can find!  Thanks!
Jim
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