What this part is and where it fits
The LM1875T/LF05 is a Class AB mono audio amplifier IC from Texas Instruments, delivering 25W into an 8Ω load from a single or split supply rail. It's built for audio output stages in powered speakers, stereo receivers, instrument amplifiers, and general-purpose line drivers where a single-channel, through-hole TO-220-5 package is preferred. The wide supply range — 16V to 60V single or ±8V to ±30V dual — means it can sit on a variety of existing rail architectures without a custom supply design.
25W into 8Ω — what that means for your BOM
The 25W rating into 8Ω is the continuous output per channel; this part is a single-channel (mono) device, so a stereo design needs two. The TO-220-5 package with formed leads suits through-hole assembly and moderate heatsinking — plan for a heatsink rated to handle the thermal dissipation at your target output level. The short-circuit and thermal protection built in means you can skip external clamp or crowbar circuits in most consumer and pro-audio builds, saving board space and BOM cost.
Sourcing and lifecycle — still in active production
The LM1875T/LF05 is listed as Active on the manufacturer's lifecycle record, with ROHS3 compliance. No last-time-buy or end-of-life notice is in effect. This part is sourced through independent distribution; availability and current pricing are confirmed at quote time.
Mounting and thermal considerations
Through-hole TO-220-5 package with formed leads. The tab is the output-stage ground — electrically connected to the negative rail in split-supply configurations, so the heatsink must be isolated or the mounting hardware must insulate the tab. Operating temperature range is 0°C to 70°C ambient, which covers indoor audio equipment but not automotive or outdoor enclosures without derating.