The CD74HC147PW is a 74HC-series priority encoder from Texas Instruments — a 10-line-to-4-line encoder that outputs the binary code of the highest-priority active input. It's a single-supply logic part running on 2V to 6V, in a 16-TSSOP surface-mount package.
The 1 x 10:4 circuit encodes nine active-low inputs into a four-bit active-low output. Output high/low current is 5.2 mA each side.
No official second-source or successor listed — if you need a dual-source hedge, the 74HC family is broadly second-sourced across TI, Nexperia, and others, but no pin-compatible alternate is named in the record.