[Milsurplus] [Boatanchors] Two 400 Volt MOSFETs Equal...

[Peter Gottlieb]

Yes and no.

What if there is a delay in turning one or the other on or off? Then you could 
get the full voltage across one of them.  And you have to deal with isolation, 
separate gate drivers, etc.

High voltage parts are getting inexpensive.  Here's an example of a 1000 volt 
part, about $6:

http://www.richardsonrfpd.com/Pages/Product-Details.aspx?productId=729045

I don't know your needs but they have a selection page where you can filter for 
characteristics.

Peter




On 11/22/2013 7:27 PM, Ian Wilson wrote:
> The voltages across the two series devices will split according to the
> ratio of the leakage currents through each device. So if the devices
> are well-matched* then you can double the standoff voltage of a single
> device. Prudence would suggest a 50% derating, so you could stand
> off 600V with two 400V devices in series.
>
> 73, ian K3IMW
>
> * well-matched = not an eBay "matched pair" :)
>
>
>
> On Fri, Nov 22, 2013 at 4:03 PM, David Stinson <arc5 at ix.netcom.com> wrote:
>
>> If I put two 400-Volt D-S MOSFETS in series,
>> do I get a MOSFET good for 800 Volts D-S?
>> Driving the gates with seperate buffers.
>>
>>
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