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LM4991MAX

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Texas Instruments Audio Amplifiers, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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LM4991MAX

Texas Instruments · Audio Amplifiers · SOIC-8

LM4991MAX from Texas Instruments, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 SHUTDOWN input Shutdown control input that turns off the amplifier bias circuitry when VDD (logic high) is applied, giving about 0.1µA typical shutdown current; it should be tied to a definite voltage.
2 BYPASS passive Half-supply bypass pin for the bias voltage, where an external capacitor CB (1.0µF recommended) to ground improves PSRR and click-and-pop performance.
3 +IN input Non-inverting amplifier input.
4 -IN input Inverting amplifier input, where the input resistor Ri and feedback resistor Rf set the gain (AVD = 2*(Rf/Ri)).
5 Vo1 output Bridged amplifier output 1, driven by the first amplifier and biased at VDD/2 with no output coupling capacitor required.
6 VDD power_in Positive supply input, with an operating range of 2.2V to 5.5V (6.0V absolute maximum) that needs a nearby bypass capacitor.
7 GND power_in Ground connection.
8 Vo2 output Bridged amplifier output 2, driven by the second amplifier (unity-gain inverting), 180° out of phase with Vo1.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-8
Category Amplifiers/Comparators
Pins 8

CAD (KiCad official)

  • Symbol: LM4991MAX
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)
  • 3D model files: lm4991max-etched.step / lm4991max-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm4991max.step / lm4991max.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (27 pp, sha256 69de3029d691cac1, retrieved 2026-10-07, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF