You cannot use the SN76176 chip as a replacement. The 75176 is a unit load comm chip with no overvoltage protection. We use the LT1785 because it is a 1/4 load and is protected against up to 60V on the data wires. We used to use the 75176 years ago, but changed because the LT1785 is more robust and allows more controllers or stations on a network.
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