Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Topology | Mono bridged-tied-load analog audio amplifier |
| Supply | 2.0 V to 5.5 V |
| Exact SOIC Output | 1.5 W typical into 8 Ω at 10% THD stated for non-WSON package conditions |
| Shutdown | 0.6 µA typical shutdown current |
| Gain | Externally configurable; unity-gain stable |
| External Parts | No output coupling capacitors, bootstrap capacitors or snubber required |
| Protection | Thermal shutdown |
| Exact Package / Packing | SOIC (D), 8 pins; 2500-piece large reel; −40°C to +85°C; marking 4871 |
Product Overview
LM4871MX/NOPB is a low-voltage bridge amplifier that drives the speaker differentially, doubling available signal swing relative to a single-ended output and eliminating the large output coupling capacitor.
The family is often advertised as a 3-W amplifier, but that 3-W figure belongs to the thermally enhanced WSON/LD package under a 3-Ω load. TI states about 1.5 W typical into 8 Ω at 10% THD for the other package options, including this exact SOIC order code.
The 0.6-µA-class shutdown current suits portable equipment. The exact package distinction is important because thermal resistance directly limits how much BTL output power can be sustained.
For related devices, see HKEQGOO’s Audio Amplifiers category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | LM4871MX/NOPB |
| Topology | Mono bridged-tied-load analog audio amplifier |
| Supply | 2.0 V to 5.5 V |
| Exact SOIC Output | 1.5 W typical into 8 Ω at 10% THD stated for non-WSON package conditions |
| Shutdown | 0.6 µA typical shutdown current |
| Gain | Externally configurable; unity-gain stable |
| External Parts | No output coupling capacitors, bootstrap capacitors or snubber required |
| Protection | Thermal shutdown |
| Exact Package / Packing | SOIC (D), 8 pins; 2500-piece large reel; −40°C to +85°C; marking 4871 |
| Manufacturer Status | Active / Production |
| Part Marking | 4871 |
Functional Highlights
BTL output eliminates a series speaker capacitor
Both speaker terminals are actively driven, improving low-frequency response and voltage swing at low supply voltage.
Exact package sets realistic output power
Using the WSON 3-W headline for the SOIC part would overstate the thermal/output capability of LM4871MX/NOPB.
Design Considerations
- Use the SOIC-specific power condition in thermal and speaker-SPL calculations.
- Keep both speaker terminals floating from ground because the load is bridge driven.
- Set shutdown and input bias states to minimize pops during power sequencing.
Product Status and Exact Order Code
Texas Instruments lists LM4871MX/NOPB as Active / Production; SOIC (D), 8 pins; 2500-piece large tape and reel; −40°C to +85°C; marking 4871.
Related Engineering Resources
Quality & Verification Support
Third-party inspection or testing can be arranged according to customer requirements. Testing fees are borne by the buyer. Additional verification requirements can be discussed before shipment. After an order is placed, physical product, label, packaging, and Date Code photos may be provided where appropriate.
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