Current controlled fet?

[Jon Slaughter]

We have IGBT's but what about the reverse? A mosfet like device who's gate
is current controlled? This might not seem very useful but they would remove
the need for special drivers?

 

[Tim Williams]

Or if you want another 4-layer structure, they make SCRs, and complementary
to IGBTs, they also make IG SCRs (I forget the proper acronym).

Structurally, a BJT is indeed analogous. That reminds me, I need to find a
four-lead MOSFET and see if I can use its substrate as base of an NPN. I'm
guessing beta is poor, but might be equal in both directions.

Tim

 

[[email protected]]

Tim - looking for an isolation transistor for a "wired-or" bus? If so,
look at some of the 2 transistor 6 pin devices from Rohm & ? & ? - don't
rember the names. Both way gain isn't shown in the specs & you'll need
to get them and measure for that spec. The ones I've seen were quite
effective on a 5v bus.

Hul

Or if you want another 4-layer structure, they make SCRs, and complementary
to IGBTs, they also make IG SCRs (I forget the proper acronym).