3.17 W into 4 Ω — the headline rating that defines the BOM fit
The Analog Devices SSM2377ACBZ-R7 is a Class D mono audio amplifier delivering 3.17 W into a 4 Ω load from a single supply. That output level suits a single speaker in a portable speaker, a tablet, or a small soundbar where board area is tight and efficiency matters.
Package and mounting
Depop circuitry suppresses the pop on power-up and shutdown, which saves a design cycle adding an external mute transistor. Differential inputs reject ground noise on long input traces — useful when the audio source is a codec on a separate board. Short-circuit and thermal protection let the amp survive a speaker-wire short or a stalled fan without latching up. The shutdown pin lets the system microcontroller cut supply current to near zero during idle.
9-WLCSP — tiny footprint, handle with care
It saves board area but demands a clean solder-paste stencil and a reflow profile matched to the 0.4 mm pitch. Store the reels dry — MSL 1 is typical for this package family, but the bag seal date matters. The small footprint also means the PCB layout must keep the output filter and decoupling capacitors close to the bumps; long traces add parasitic inductance that can degrade EMI.
ROHS3 compliant, so it clears European and Asian environmental requirements without an exemption.