Is there a single component that could do the following:

1) Is switched on/off by a PIC pin output,
2) Could drive tungsten filament bulbs from 240V ac @1A,
3) Could drive an array of LEDs from 18Vdc @ 1A.

This is for a device that is configuarable - i.e. as you can gather from the
above some users will want to have a low voltage dc output, while others will
want a UK mains ac output.

There are further constraints that will probably count against the obvious
answer of a relay:

The device is expected to have a lifetime in excess of 5 years and the switching
device will perform a maximum of 3 million operations per year.


I have looked at using a MOSFET in this application, but I just run into a brick
wall when it comes to generating a gate voltage for the FET that will always be
positive relative to the source.

Alan

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