On Sat, 13 Sep 2014 10:21:49 -0700, John Larkin
wrote:
On Fri, 12 Sep 2014 22:52:21 -0400, wrote:
On Fri, 12 Sep 2014 10:58:49 -0700, Jim Thompson
wrote:
I need a rail-to-rail I/O OpAmp, 5V Vcc is fine, slow speed setting a
current mirror.
What specs?
What would you guys in the discrete world recommend as being
well-behaved, no peculiarities, etc? (And readily available ;-)
I've been using the MicroChip MCP6294, mainly because they're cheap
but the specs matter.
That looks OK for non-critical stuff. The single MCP6291 in SOT23 is
around 40 cents in quantity. (I like singles, usually.) Somewhere
there ought to be a really cheap workhorse opamp, ten cents maybe.
I'm paying less than that for the quad. Less than half for the single
(though I haven't used any). Yeah, it's a general purpose opamp with
nothing special going for it except its cost. It is R-R I/O, which
command a premium over others. I can get non R-R opamps from NJR for
well under $.10 but they're pretty old-school bipolars. I'm trying to
keep my analog rail under 5V, which kinda dictates R-R.