325 mW into 8 Ω — the output ceiling that sets the speaker load
The LM386MM-1 delivers 325 mW into an 8 Ω load from a single channel — enough to drive a small speaker or earpiece in a portable radio, intercom, or toy. That output power is specified at a 9 V supply; drop to 5 V and the available swing halves, so budget the rail voltage against the SPL you need. It is a Class AB amplifier — the output stage biases into conduction across the full waveform, so crossover distortion is low but quiescent current is higher than a pure Class D. For a battery-powered project running off a 9 V cell, the 4 mA typical idle draw is manageable; at 4 V the part still operates, though output headroom shrinks.
No last-time-buy window remains open; the part is no longer manufactured. Procurement must source from surplus or broker inventory — the independent channel is the only supply route. Because the part is obsolete, every unit on the market is new-old-stock or pulled from excess. Verify date code freshness and MSL bake requirements before reflow; older stock may have absorbed moisture beyond the rated floor life.
8-VSSOP package — reflow profile and board fit
The LM386MM-1 comes in an 8-VSSOP (also listed as 8-TSSOP, 8-MSOP) with a 3.00 mm body width. The 0.65 mm pin pitch is standard for this package family; the land pattern matches the JEDEC MO-187 footprint. No exposed pad — thermal dissipation goes through the leads alone. Do not use this part in an engine bay, outdoor enclosure, or any environment that sees sustained temperature outside that window.