[avant,acorde] I want to know the detailed model name of the IC used in the PHX400 interface circuit.

The detailed model numbers of the ICs listed in the interface circuit type in the manual are as follows.

7SZ125:TC7SZ125FU,LJ(TOSHIBA)
VHC125:TC74VHC125FT(TOSHIBA)
LVC244:TC74LCX244FT(TOSHIBA)
Transistor for /TRES,WDT output:MMBTA06LT1G(ON Semiconductor)