3-to-8 decoder in the LS family
The SN74LS137D is a 3-to-8 line decoder from the LS (Low-Power Schottky) series, designed to demultiplex or decode three binary inputs into one of eight active-low outputs. Supplied in a Bulk package, this order code is the standard through-hole or surface-mount variant depending on the suffix — the D indicates a SOIC footprint, which is the common choice for PCB integration in control logic and address decoding applications.