component
LM4871MX
Public Unreviewedby Ray
Texas Instruments Audio Power OpAmps, SOIC-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownLM4871MX
Texas Instruments · Audio Power OpAmps · SOIC-8
LM4871MX from Texas Instruments, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | SHUTDOWN | input | Micropower shutdown control. Pulling this pin to VDD activates shutdown mode (IQ = 0.6 µA typ); tie low (via RPU pull-up to VDD with switch to GND, or drive logic-low) for normal operation. |
| 2 | BYPASS | passive | Half-supply (VDD/2) bypass node from the internal 100 kΩ/100 kΩ divider. Connect an external bypass capacitor CB (typ 1.0 µF) to GND for PSRR and click/pop suppression. |
| 3 | +IN | input | Non-inverting input of the first amplifier stage. Typically tied to the BYPASS (VDD/2) reference through the internal biasing shown in the typical application. |
| 4 | -IN | input | Inverting input of the first amplifier stage. Audio input is AC-coupled through Ci (typ 0.39 µF) and Ri (typ 20 kΩ); closed-loop gain set by Rf/Ri (Av = -2·Rf/Ri for BTL). |
| 5 | Vo1 | output | First bridged output. Connects to one side of the 8Ω speaker load; the pair Vo1/Vo2 form a BTL output capable of 1.5 W (typ) into 8Ω at 10% THD, 5V supply. |
| 6 | VDD | power_in | Positive supply, 2.0 V to 5.5 V (6.0 V absolute max). Bypass with CS (typ 1.0 µF tantalum) to GND close to the pin. |
| 7 | GND | power_in | Device ground return. All signal and supply references measured with respect to this pin. |
| 8 | Vo2 | output | Second bridged output (internal Av = -1 inverter of Vo1). Connects to the opposite side of the speaker from Vo1 to form the BTL drive. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Op-amp/Cmp |
| Pins | 8 |
Ordering variants
Same part, different packaging or reel option.
LM4871MXMLM4871MXLM4871MXMMLM4871MXMMXLM4871MXNLM4871MXLDLM4871MXLDX
CAD (KiCad official)
- Symbol:
LM4871MX - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (24 pp, sha256
6a0761fa3d77aa82, retrieved 2026-08-17, tier: manufacturer) - Extractor:
ds2sf(Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate. - CAD: KiCad official libraries (CC-BY-SA 4.0).