Device Overview
LM4871MX/NOPB is the SOIC-8 tape-and-reel version of Texas Instruments’ LM4871 mono bridge-tied-load (BTL) Class-AB audio amplifier. Because both speaker terminals are actively driven, the BTL architecture increases the available load voltage swing and removes the need for a large series output-coupling capacitor.
Key Selection Information
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | LM4871MX/NOPB |
| Architecture | Mono BTL Class-AB audio amplifier |
| Supply range | 2.0 V to 5.5 V |
| SOIC output-power reference | 1.5 W typical at VDD = 5 V, RL = 8 Ω, THD+N = 10%, f = 1 kHz |
| Shutdown current | 0.6 µA typical |
| Gain | Externally configurable; unity-gain stable |
| Output network | No output-coupling capacitor, bootstrap capacitor, or snubber network required |
| Protection | Thermal shutdown |
| Package / packing | SOIC (D), 8 pins, large tape-and-reel |
| Operating temperature | -40 °C to +85 °C |
| Manufacturer status | Active |
Engineering Selection Notes
The 3 W family headline must not be assigned to this SOIC order code. TI reserves that higher output condition for the thermally enhanced LD/WSON version under a lower-impedance load; the other package options, including SOIC, are referenced at about 1.5 W typical at VDD = 5 V into 8 Ω with 10% THD+N at 1 kHz. Package thermal capability is therefore part of the electrical selection, not just a footprint detail.
BTL operation means neither speaker terminal is a ground reference. Connecting one side of the load to ground would defeat the intended bridge output and can stress the amplifier. PCB routing, connector wiring, and any measurement setup should preserve the floating load connection.
The 0.6 µA shutdown mode is useful for portable systems, but audible pop/click behavior still depends on input biasing, shutdown timing, and supply sequencing. The absence of an output capacitor reduces component count, yet it makes correct BTL wiring and power-up behavior more important.
Official Engineering Resources
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