Hi Matt,

I don't have a particular number for you right now but do have a lame 
answer: it depends.

One of the specs of most of the Microchip amps is fairly low supply 
voltage, say, 2.2 to 5.5 or so.  If this works for you, great.  If you 
need up to say 12 or so, Microchip has much less to offer.

Second, make sure to check what the output does when sourcing or sinking 
current.  Some amps suddenly develop inability to get to within 500mV or 
more of the rails if asked for as little as a half milliamp.

Probably next on my list of specs to be aware of is speed.  Many low 
power rail-rail amps poop out at a few 100kHz of gbw.  And so it goes.

Good luck!

Matthew Miller wrote:
> Hi Everyone,
> 
> Since beginning work with op-amps, I've found rail-to-rail op-amps very
> useful for battery powered applications. I bet you folks have a favorite in
> this area, but what brand op-amps have the lowest cost?
> 
> I've recently tried the Microchip op-amps and they are pretty good. For some
> of them the offset voltages are awful though, but there not too bad,
> considering the cost.
> 
> Can anyone recommend a line of good rail-to-rail, single supply op-amps? I'm
> asking here since the Digikey catalog has become too think to thumb
> through. (If my postman wasn't such a nice guy he would hate me for
> receiving Digikey catalogs...)
> 
> Thanks. :)
> 

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