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From: Hul Tytus <ht@panix.com>
Newsgroups: sci.electronics.design
Subject: Re: ac138
Date: Sat, 18 May 2024 19:27:12 -0000 (UTC)
Organization: PANIX Public Access Internet and UNIX, NYC
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Probably driving valves on & off but a couple other applications are hoovering
close by. As piglet mentioned, there is only one on at a time.
 
Hul

John Larkin <jjSNIPlarkin@highnonolandtechnology.com> wrote:
> On Fri, 17 May 2024 10:58:28 -0700, Don Y
> <blockedofcourse@foo.invalid> wrote:

> >On 5/17/2024 8:15 AM, Hul Tytus wrote:
> >> Anyone know of an ic similar to the hc/ac138/238 (16 pin,
> >> 1 input to 8 output multiplexer) but with outputs of the
> >> open collector/drain style that can handle 2 amps at
> >> 12 volts?
> >
> >The '138 is a decoder (demultiplexer).  What you are looking
> >for is more likely considered a hammer driver.  The two
> >functions tend not to coexist; if you wanted a low-side
> >driver that could handle 8 loads, you would likely be looking
> >to drive any *combination* of those loads... an "octal
> >driver".
> >
> >You can probably find something automotive that would give you
> >8 such outputs in a package (though 8@2A would likely be
> >pushing the power dissipation of a normal package) -- but it
> >would likely have an I2C or SPI interface, requiring you
> >to do the "decoding"/selection elsewhere.
> >

> There are lots of SPI power drivers, like TPIC6595, but not 6 pins.
> Somebody makes a higher-current 4-channel part.

> Some logic chip could drive a power buffer, like ULN2003. But 8 loads
> at 2 amps each is extreme. Discrete fets make more sense at these
> currents.

> What's the load?