extreme low power transistor?

[Bob Morein]

Can anyone point me in the direction of devices/manufacturers/data sheets
for a transistor capable of operating with extreme low power?

 

[Stepan Novotill]

On Sat, 20 Sep 2003 17:09:01 -0400, "Bob Morein" <nowhere@nowhere.com>
wrote:

Can anyone point me in the direction of devices/manufacturers/data sheets
for a transistor capable of operating with extreme low power?

Something with a small die. 2N5210 maybe?

http://www.fairchildsemi.com/ds/2N/2N5210.pdf
However most of the power dissipation is in the way the circuit is
designed. In the 70s, most smoke detectors were made using discretes,
either bipolar or the CMOS 4007 chip, and the batteries still lasted a
long time. I have schematics for a number of these and will post some
day.
You can use diodes as pullup resistors too. see:
http://members.shaw.ca/novotill/SolarPoweredMotor/index.htm
for an example of this.

 

[Flyking]

Point out you desired detail specification


flyking

"Bob Morein" <nowhere@nowhere.com> wrote in message
news:jomdnbiQF5NzXPGiXTWJhQ@comcast.com...

Can anyone point me in the direction of devices/manufacturers/data sheets
for a transistor capable of operating with extreme low power?

 

[Bob Morein]

"Flyking" <flyking@mail.com> wrote in message
news:bkj7a0$4l72@imsp212.netvigator.com...

Point out you desired detail specification


flyking

"Bob Morein" <nowhere@nowhere.com> wrote in message
news:jomdnbiQF5NzXPGiXTWJhQ@comcast.com...
Can anyone point me in the direction of devices/manufacturers/data
sheets
for a transistor capable of operating with extreme low power?

I cannot, because I want the absolute lowest.

I have no spec.
Any info appreciated.

 

[Bob Morein]

"Stepan Novotill" <snovotill@hotmail.com> wrote in message
news:eh7qmvogb9hgmdmfkv6k2vd49c17pj9gm3@4ax.com...

On Sat, 20 Sep 2003 17:09:01 -0400, "Bob Morein" <nowhere@nowhere.com
wrote:

Can anyone point me in the direction of devices/manufacturers/data sheets
for a transistor capable of operating with extreme low power?

Something with a small die. 2N5210 maybe?
http://www.fairchildsemi.com/ds/2N/2N5210.pdf
However most of the power dissipation is in the way the circuit is
designed. In the 70s, most smoke detectors were made using discretes,
either bipolar or the CMOS 4007 chip, and the batteries still lasted a
long time. I have schematics for a number of these and will post some
day.
You can use diodes as pullup resistors too. see:
http://members.shaw.ca/novotill/SolarPoweredMotor/index.htm
for an example of this.

Judging by the maximum power dissipation of 600 mw, it would seem an even

smaller die is possible.
I'm interested in operation approaching the nanowatt level.
Possible?

 

[Stepan Novotill]

On Sun, 21 Sep 2003 01:36:02 -0400, "Bob Morein" <nowhere@nowhere.com>
wrote:

"Stepan Novotill" <snovotill@hotmail.com> wrote in message
news:eh7qmvogb9hgmdmfkv6k2vd49c17pj9gm3@4ax.com...
On Sat, 20 Sep 2003 17:09:01 -0400, "Bob Morein" <nowhere@nowhere.com
wrote:

Can anyone point me in the direction of devices/manufacturers/data sheets
for a transistor capable of operating with extreme low power?

Something with a small die. 2N5210 maybe?
http://www.fairchildsemi.com/ds/2N/2N5210.pdf
However most of the power dissipation is in the way the circuit is
designed. In the 70s, most smoke detectors were made using discretes,
either bipolar or the CMOS 4007 chip, and the batteries still lasted a
long time. I have schematics for a number of these and will post some
day.
You can use diodes as pullup resistors too. see:
http://members.shaw.ca/novotill/SolarPoweredMotor/index.htm
for an example of this.

Judging by the maximum power dissipation of 600 mw, it would seem an even
smaller die is possible.
I'm interested in operation approaching the nanowatt level.
Possible?

2N5210 has a very high hfe; I think you might need that when operating

at rediculously low collector currents and low collector voltages. It
is a fairly low power device to boot, and it's very easy to buy one.
I'm no expert though.

The circuit I linked to (above) runs on a few nA if a low leakage cap
is used, yet it uses very ordinary transistors, so yes it can be done.