Re: ac138

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?