Path: ...!news.misty.com!weretis.net!feeder9.news.weretis.net!panix!.POSTED.2602:f977:0:1::3!not-for-mail From: Hul Tytus 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 Message-ID: References: Injection-Date: Sat, 18 May 2024 19:27:12 -0000 (UTC) Injection-Info: reader1.panix.com; posting-host="2602:f977:0:1::3"; logging-data="8664"; mail-complaints-to="abuse@panix.com" Bytes: 2186 Lines: 37 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 wrote: > On Fri, 17 May 2024 10:58:28 -0700, Don Y > 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?