Key ratings and what they mean for the BOM
The LM4861MX/NOPB: The 1.5W into 8Ω rating is the headline figure — it tells you the amplifier can drive a small speaker to reasonable volume without clipping. At lower supply voltages (say 3V) the output power drops, but the part still delivers useful audio for voice prompts or alert tones. The 2V minimum supply means it can run from a nearly depleted battery, extending runtime in portable gear. Shutdown and thermal protection are built in: the shutdown pin lets a microcontroller put the amp into a low-power idle, and the thermal protection prevents die damage if the speaker is shorted or the ambient temperature spikes. The 8-SOIC package is a standard footprint; no board respin needed if you're replacing an older 8-pin audio amp.
Lifecycle and sourcing note
The LM4861MX/NOPB is listed as Active with ROHS3 compliance. No end-of-life notice or last-time-buy window is on record, so it remains a safe choice for new designs and production replenishment. The part is sourced through independent distribution and quoted to order against an RFQ — availability and current pricing are confirmed at quote time, not on this page.