The ARINC 429 Line Receivers translates incoming ARINC 429 data bus signals to a pair of TTL/CMOS outputs over four independent channels, and is a direct drop-in replacement for Holt and DEI quad line receivers.- Drop-in pin for pin replacement for Holt line drivers:-- HI-8444-- HI-8445- Drop-in pin for pin replacement for DEI line drivers:-- DEI-1044-- DEI-1045