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I want to design Sourcing Type Digital Inputs with ISO1228,it can protect against surges of 1 kV/42 Ω,
but there have no parameters above 500V surge level in the datesheet。
only can find this。 can somebody provide relevant parameter about this?
Rsurge =1k respond to surge 1kv from the datasheet. there only have 500Ω in source mode
Hello Meng,
Thank you for your question.
I believe that the RTHR value is not dependent in choosing the RSurge value. The RTHR value is dependent on the RILIM value. To choose the RTHR value, please look at the RILIM values in the table.
For example, if you want RILIM of 0 ohms with a type 1 input in source mode, the RTHR would be 1500 ohms.
Regards,
Aaditya Vittal