350 mW mono into 16 Ω — what that means for your load
The LM4819MM/NOPB: The headline rating is 350 mW continuous output into a 16 Ω load from a single channel. That is the power delivered to the speaker, not the supply draw. For a portable device running on a 3.7 V Li-ion cell, this is enough for a headphone driver or a small internal speaker in a handheld terminal, alarm, or IoT voice-prompt module. The 16 Ω load is typical for earbud and miniature speaker drivers — a 32 Ω headphone would pull roughly half the power, extending battery life.
Supply range and temperature — battery and environment fit
The 2 V to 5.5 V supply range covers single-cell Li-ion (3.0-4.2 V), two-cell alkaline (2.4-3.0 V), or a regulated 3.3 V or 5 V rail. No external charge pump or boost converter is needed for the audio path. The -40°C to 85°C industrial temperature grade means it works in outdoor IoT gateways, automotive cabin (not under-hood), and factory-floor HMI panels — but not in engine-bay or high-temp sensor modules without derating.
Feature set — depop, differential inputs, shutdown
The depop circuit suppresses the turn-on thump that would otherwise couple into the speaker — a real concern in battery-powered devices where the amplifier powers up from a low-impedance source. Differential inputs reject common-mode noise picked up on the audio traces between the codec and the amp, which is useful when the PCB layout forces long analog runs near a switching regulator. The shutdown pin pulls the quiescent current to near-zero, extending standby life in a product that spends most of its time listening for a wake command.
Package and footprint — 8-VSSOP, 0.65 mm pitch
The LM4819MM/NOPB comes in an 8-VSSOP (also listed as 8-TSSOP / 8-MSOP with 0.118-inch, 3.00 mm width). The 0.65 mm lead pitch is standard for this package class — two-layer boards with 6/6 mil trace/space rules fan it out without micro-vias. The exposed pad on the VSSOP variant is not a thermal pad here; the 350 mW output does not generate enough heat to need one, but the pad should still be tied to the ground plane for mechanical stability and to avoid floating-metal issues.
Sourcing and compliance
ROHS3 compliant (no exemptions) — no conflict with EU or similar regulatory markets. The part is available in Tape & Reel (TR) or Cut Tape (CT) for prototyping. For a BOM that already uses this footprint, the LM4819MM/NOPB is the direct, active-production choice. Quoted to order against your BOM quantity; availability and current pricing confirmed at RFQ time.