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Path: ...!Xl.tags.giganews.com!local-2.nntp.ord.giganews.com!nntp.supernews.com!news.supernews.com.POSTED!not-for-mail NNTP-Posting-Date: Fri, 17 May 2024 19:01:42 +0000 From: John Larkin <jjSNIPlarkin@highNONOlandtechnology.com> Newsgroups: sci.electronics.design Subject: Re: ac138 Date: Fri, 17 May 2024 11:59:47 -0700 Organization: Highland Tech Reply-To: xx@yy.com Message-ID: <fr9f4jtdqtoge7jivttb7h0kd5om1dio4k@4ax.com> References: <v27sad$fuo$1@reader1.panix.com> <v285sd$2a7cm$1@dont-email.me> X-Newsreader: Forte Agent 3.1/32.783 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 32 X-Trace: sv3-atg4CiGRrjYyHmeDG91VyOgFedb6yUiYkdt8su18v42SoQmOtsA0NBahDUQYVZ/Dh0DlDydLn1yuj3q!Aor1GtfleHlcZrZ1u/f66gHfXQoi/oDgcsvop9VMnHoxoQUf5jMOr7O5iO8Ac8/XDJzU+xgZvPfG!q9Xoqw== X-Complaints-To: www.supernews.com/docs/abuse.html X-DMCA-Complaints-To: www.supernews.com/docs/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Bytes: 2323 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?