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TLV3501: Hundreds of mV's of unexpected hysteresis present in the device

Part Number: TLV3501


I am trying to utilise this as a sensitive comparator for fast pulses (<50ns) in a LIDAR enviroment. However, the device seems to suffer from massive amounts of hysteresis for frequencies ranging from DC to 200MHz. The amount varies depending on the setup, but the lowest it has been is 200mV (and as large as 600mV).

In terms of setup, it is fairly straightforward, with the device soldered onto an adaptor board and the rest of the circuit on a piece of stripboard. Different circuits have been attempted, but even the simplest case modelled in the reference design, , leads to the hysteresis.

The behaviour is consistent across 3 copies of the device, at least in terms that there is severe hysteresis in all of them. Further, the circuit behaves as expected when a much slower comparator is used (though this one wouldn't work for the intended application). 

Would you be able to help me understand where this could be coming from and how I could get around it?

Many thanks,


  • Paul

    thanks for reaching out and sorry to hear about the problem you are experiencing.  Please share your exact schematic, circuit pictures, and waveforms of what you are seeing.  As the part does not have this much hysteresis, we will need to see what in the circuit could be contributing to the results you are obtaining.  This is a relatively fast comparator, so setup and using good high speed board techniques is necessary.


  • Paul

    We have not seen any new input on this post, so it will be closed.  if further support is needed, feel free to reply or open a new thread.

    Thanks for your use of the forum.