I've been using the LM1921, LM1950, and LM1951 High Side
Switch IC's to drive solenoids for the past couple of
years.  These have the advantage that they take a CMOS/TTL
logic input, handle flyback voltage spikes without external
components, and have digital thermal shutdown/overvoltage
logic-level status pins that are uP readable.

National Semiconductor has now stopped manufacturing *all*
of these parts , which completely mystifies me, seeing as
the big automotive companies use these parts in ABS braking systems.
At the time of obsolescence, National had something like
a million parts in inventory with their three primary distributors.
It should tell you something that two months later, there was
nary a part to be found, and I'm now stuck supporting current
and future boards without any parts.

So, in short, I'm in desparate need of a single-chip TTL/CMOS solenoid
driver that can handle a 1A load at 27v.

Here's the weenie: for most of the boards, I'm dealing with a
24v DC solenoid, triggered by TTL.  This is split into + and
- 13.8 v, with the driver part itself grounded to common, and the low side
of the switch connected to -13.8v.  This all works just fine,
as long as the internal Zener of the switching part is rated for
at least 14v.  I can't, for the life of me, find a single
chip solution that will work as a replacement.

Anybody have any suggestions for a *minimal component count* solution
that I might be able to brew up and cobble into the existing
boards?

Thanks,

-Will
"Life is a meritocracy"