Supply voltage and bus margin
If your board runs a 5 V rail from a buck converter, keep the output setpoint above 4.75 V to hold margin through load transients. Below 4.5 V the transceiver may not drive the recessive/dominant levels correctly, so a separate 5 V LDO for the CAN transceiver is common in mixed-voltage designs.
That covers cold-crank at -40°C and the junction temperature inside a sealed ECU near the engine. For industrial applications, the same range handles outdoor enclosures in direct sun or near a motor drive. The 8-SOIC package with 3.90 mm width fits standard footprints, and the surface-mount assembly is straightforward for reflow.
The base product number TCAN1042 covers multiple variants (different temperature grades and wake features), but the HGD suffix specifically denotes the 8-SOIC package and the extended temperature range.