dIGIKEY HAS


1500v MOSFETS TFV3N150, TFV4N150  about  $3

IGBT, 1700V IXGH32N170A ~=3D $15

Bipolar BUX48A  1000V TO3 15A! $5.59/1
Darlington STP03D200 1200V TO220 100mA  $6.47/1

The MOSFETS look al;most useable - but Digikey sell in 1000 lot and
have no stock

Farnell UK and Mouser claim stock and sell in 1's.
Element 14 has none, Farnell UK notwithstanding.

Datasheet

   http://www.st.com/stonline/products/literature/ds/13102.pdf

N Channel - a P Channel would probably have been better - but less availabl=
e.

You can use it high side if you can supply gate drive (5V Vgth.).
Optocoupler with 9V battery should give you years between battery changes :=
-).

Isolated from tab to3500V. Useful.






On 28 October 2010 23:24, Matt Rhys-Roberts <matt@nu-ins.com> wrote:
> We need to switch a single attenuated ADC between a number of high
> voltage (+/-1Kv) sources. Some kind of solid state relay or multiplexer
> appears to be necessary. The switching element would only need to pass
> well below 1mA.
>
> Can anyone here suggest such a semiconductor device that would withstand
> +/-1kv, at load currents well below 1mA? Ideally PCB mounted, as small
> as possible, and controllable by TTL logic levels.
>
> I've been avoiding using reed relays so far, for fear of them wearing
> out prematurely (looks like they may last for around 10 million or so
> cycles). However if nothing solid state can beat them, then I may employ
> them and assert that they only be operated sparingly!
>
> Don't flame me if I've overlooked the obvious...
>
> Best regards,
> Matt
> --
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