30 W per channel into 8 Ω — the power budget for a stereo speaker pair
The TPA3118D2DAPR is a Class D stereo amplifier delivering 30 W per channel into an 8 Ω load from a supply rail up to 26 V. That 30 W x 2 figure is the maximum output power at 10 % THD+N — for a typical music signal the average power is lower, but the headroom handles transients without clipping into an 8 Ω bookshelf or ceiling speaker.
Package and thermal — the exposed pad is the heat path
The pad carries the heat from the output FETs; without a proper thermal via array under the pad, the junction temperature rises above the 85 °C ambient limit and the thermal protection (one of the listed features) will cycle the output. The differential inputs reject ground noise between the source and the amplifier — useful when the audio source is on a separate board or a remote Bluetooth module. The mute and shutdown pins let a microcontroller hold the outputs off during power-up sequencing to avoid a pop through the speaker.
The tape-and-reel packaging suits automated pick-and-place for volume builds. For prototyping or small-batch rework, the cut-tape variant is also listed — specify the exact ordering code suffix when requesting a quote.