Is the 4066 suitable for power switching?

galapogos a écrit :

RDSon. Read the datasheet. There are specialized power supply switches and the 4066 isn't one at all.

The 4066 has a series resistance which might be why your having problems. Maybe you could try some transistors on the output.

Regards

AJ

Thanks. I read the datasheet but no Ron was given for 3.3V. I guess I can extrapolate that from the 5V figures. Anyway, are there any generic switches that work for power switching? I don't expect anything more than 60mA.

If you're switching a 3.3V rail with a 3.3V signal and all grounds are common you can just use a PMOS FET. It's basically what you'd be getting from a specialized switch, and it's (probably) cheaper and (maybe) smaller.

If you can stand a bit of drop (less than 0.2V) you could use a PNP transistor. Zetex has some low VCEsat devices in NPNs and may have them in PNPs as well -- but why not use a FET?

You could also consider a 74ACT4066, or just a 74ACTxx buffer ('06?). These will have lower on resistances than a plain old 4066, and may be enough.

yep, but if uve only used one of the switches maybe putting them all in parallel might give you a bit more voltage.

Colin =^.^=

ll.

Hi,

I tried using a 2N930 NPN transistor with the collector wired to the oscillator ground, the emitter wired to ground, and the base wired to the control output signal from my MCU gpio pin, with a 1K series resistor. However, the io pin voltage seems to be ~3.15V no matter what I drive it with my application, and the base voltage is ~0.7V. VCE is always close to 0V, which means the oscillator is always getting full Vcc. What am I doing wrong here?

classic part for this is something like the FDG6324 or FDG6323

David