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SN75ALS176B: Esd protection - crive capacitance

rama surya narasimha rao kolluru
Prodigy 10 points
Part Number: SN75ALS176B


We need to add ESD diode with capacitance of 95pF @ 1MHz on the "sn75als176b" RS 485 protection .
earlier we used ESD diode 5pF @ 1MHz. will this drive on it.

  • 0
    TI__Guru 53212 points

    Hi Rama,

    I have a few questions about the application to see if this additional diode can be used: 

    What is the data-rate you are using for the application?  If is >2Mbps can you include the diode part number so I can see its higher frequency capacitance characteristics as the fundamental frequency should be >1MHz if the data rate is >2Mbps. 

    Also how many transceivers are on the bus?

    How long is the differential bus? 

    Is the system terminated?

    Is the diode being placed between the differential outputs of from each differential output to ground? 

    Please let me know as all of these factors are going to impact whether or not this part can be used in your application.


    Best,

    Parker Dodson