Thin traces can be used on the input due to the low current logic that is typically used to drive the TXH0137D-Q1. Take care to separate the input channels as much as possible to eliminate cross-talk. Thick traces are recommended for the output to drive high currents that may be needed. Wire thickness can be determined by the trace material's current density and desired drive current.

Since all of the channels currents return to a common ground, it is best to size that trace width to be very wide. The V_CC pin only draws up to 30 µA and thick traces may not be necessary.