The Texas Instruments OPA1644AIPW is a quad-channel audio operational amplifier from the SoundPlus™ series. It delivers an 11 MHz gain-bandwidth product and a 20 V/µs slew rate.
Key ratings and what they mean for a field swap or BOM line
The 20 V/µs slew rate and 11 MHz GBW suit audio-band signals. The quad draws 1.8 mA per channel.
That means a field-service tech needs a fine-tip iron or hot-air station, and a steady hand — this is not a socketed DIP you can swap in a parking lot.
There is no NRND or EOL notice, so it is safe to qualify into a new BOM or specify as a spare.