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By 3.3-V bus voltage, do you mean this is the pull-up voltage for CANH? If so, may I ask why would you want this? There are 3.3-V powered discrete transceivers available, but these are typically used in applications where a 5-V supply is not available (while the lower-voltage transceivers maintain compatibility with 5-V devices, they often cannot meet ISO 11898-2 physical layer requirements across all operating conditions). Since the TCAN4550 integrates a 5-V LDO, though, rail availability wouldn't be a concern.
