CD54HC251, CD74HC251, CD54HCT251, CD74HCT251 SCHS1.
Texas Instruments
CD74HCT251E - 8-Input Multiplexer
CD54HC251, CD74HC251, CD54HCT251, CD74HCT251 SCHS169D – NOVEMBER 1998 – REVISED MARCH 2022 CDx4HC251, CDx4HCT251 High-Speed CMOS Logic 8-Input Multipl.