TS3A27518E: Difference between TS3A27518E and TMUX1574

Hi Danny,

There are some specification differences that affect price:

1. Channel Count  - the TS3A27518E has six channels compared to TMUX1574's 4.

2. Supply Current - The TS3A27518E has lower typical supply current across usage (max is 3uA compared to typical 7.5uA standby current for TMUX1574)

3. Charge Injection - Switching will cause a larger error on the output for the TMUX1574 which has a charge injection of 3.5pC with a 1nF load and the TS3A device only has a charge injection of 0.47pC with a 100pF load capacitance.

4. Turn On/ Turn Off Time - This is the microsecond range for the TMUX1574 and in the nanosecond range for the TS3A device.

Now that being said - parameters aren't the only thing driving price; it is also manufacturing costs and typically older processes can be a bit more expensive, especially if they have more precision specs (like low charge injection). The TS3A device is originally from 2009 whereas the TMUX1574 is from 2018. 

Now if comes down which part to choose it really comes down to application:

I'd choose the TS3A if:

1. Supply Current is A Large Concern in the Design

2. The designer wants to minimize large overshoots/undershoots during switching of the mux

3. Designer need a device that will enable and disable quicker than a few microseconds

4. Designer has 6 Channels and need a single chip solution 

5.  Bandwidth Needs are <240MHz and one of the above 4 options is met

If none of these use cases fit - I'd  suggest the TMUX1574 because it is a good part at a lower price that performs well in a lot of areas but the TS3A does have some performance benefits depending on the application.

Please let me know if you have any other questions!

Best,

Parker Dodson