I am reading [BC817 datasheet](https://assets.nexperia.com/documents/data-sheet/BC817-25QA_40QA.pdf). According to the datasheet, maximum collector-emitter voltage at open base condition is 45 V. In typical applications we don't use open base configuration. My question is that how can I find maximum collector-emitter voltage when the base is biased. I could not find relevant information in the datasheet (Maybe I have not enough knowledge about it). Many thanks for your time.