SN74CB3Q3257: SN74CB3Q3257PWR

IEC 60950-1 is a system-level standard, i.e., it applies to the complete device. A chip alone cannot be certified. (And a simple switch like the SN74CB3Q3257 does not provide galvanic isolation and cannot handle high voltages, so it is usually not relevant for such certification.)

See ti.com/quality-reliability-packaging-download/report?opn=SN74CB3Q3257PWR.