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TS3A5223: Lower Con drop in Replacement

Sepeedah Zadeh
Expert 3150 points
Part Number: TS3A5223
Other Parts Discussed in Thread: TS5A23159, TS5A23157, TMUX1136, TMUX154E

Hello team, 

Customer is using TS3A5223 on a production project, interfacing a 3MHz clock. There is some unusual behavior being observed on the board and after probing the signal out of the mux, we believe the high CON of TS3A5223 is deforming the clock signal. With further test, we think 50pF or less should help to get this resolved. so we need to find lower con p2p option for TS3A5223. The options I'm finding are below, but none are p2p drop in. Can you please verify and let me know in case we may have another p2p option we can recommend? Thanks!

- TS5A23159 - Con = 55pF, a step improvement from TS3A5223, not p2p drop in. 

- TS5A23157 - Con = 17.5pF, at the cost of increased leakage current , not p2p drop in

  • 0
    TI__Mastermind 35638 points

    Hello Sepeedah,

    What's the end product here? You're correct in your assessment that there are no P2P drop in replacements for the TS3A5223.
    To shed further light on the bandwidth behavior, these devices bandwidths are spec'ed at given conditions (usually 50ohms and some variable cap in the 5-35pF range). The bandwidth in the system environment will be highly dependent on the load of the actual system. So the route you've taken in varying the capacitance to see how much room you have to work with is a good way to determine the Con limitations of the system itself and how much room you have to work with.

    So knowing that you have approx. 50pF max of cap before you're seeing a problem we can narrow this down using the TI.com search tool and filtering and sorting the On-capacitance column which can be toggled on and off on the far left side of the searching page.


    I've narrowed down some choices based on the TS3A5223 first selected but knowing more of the customer key concerns can help make a definite call on what the best pick for a replacement would  be. 

    The TMUX1136 is a low R-on device as well with an Con of only 20pF. It's a really good device for digital applications. It comes in the USON package (1x2.5mm^2) so there isn't added size compared to the 5223 (1.8*1.4mm^2 = 2.52mm^2). This is a 5V device so it should be able to handle the voltage range requirements seeing as the 5223 supported up to 3.6V. TMUX1136 will also win in the leakage current category. If they can work with the logic levels, this would be the recommended selection.

    The TS3DS26227 is another good option. Low Ron, only 10pF Con. Half the on state leakage as the 5223 device as well. It supports up to 3.6V supply as well.

    Another option would be the TMUX154E. It's not a drop in replacement but it comes in the same 1.8x1.4mm^2 UQFN package. Still a low On resistance part with a low 7.5pF Con. This device has a powered off protection feature that allows for protection of down stream devices by putting the supply pins in HI-Z when the devices is powered off (Vcc = 0V).

    Let me know if any of these meet the criteria that the customer is looking for and if any of these devices end up being selected as a replacement. If there are any key concerns that we've missed here and I can help with any further questions!

    Thanks,
    Rami Mooti