Re: Switching transistor question

default wrote:
The short idea:

What I want to do is switch ~1/2 amp with no more than .2 volts drop
(would be happier with .15) . . . all this on a 3 volt supply,
burning no more than about 150 milliwatts, and with no moving parts.

Any other ways to skin this animal?

The application:
I'm building a time-lapse camera using an el-cheapo 1.3 megapixel
electronic camera.

The camera is happy with about 2.2 volts at ~500 ma when fully turned
on - providing the source impedance is low and is designed for a pair
of AAA cells.

Take a look at this high current, high gain, low saturation voltage transistor:
http://www.zetex.com/3.0/pdf/ZTX1047A.pdf

It will drop about .05 volts with 500 mA collector current and 2 mA base current.
.