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LM4873MTEX

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Texas Instruments Audio Amplifiers, HTSSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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LM4873MTEX

Texas Instruments · Audio Amplifiers · HTSSOP-20

LM4873MTEX from Texas Instruments, in a HTSSOP-20. 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 Applying VDD activates micro-power shutdown (logic threshold typically VDD/2, 0.7 µA typ shutdown current), logic low gives normal operation.
2 GND power_in Ground pin; all voltages are measured with respect to the GND pins.
3 +OUT A output Channel A non-inverting bridge output; the speaker load is connected between -OUT A and +OUT A.
4 VDD power_in Positive supply, 2.0V to 5.5V operating range, bypassed with a local 1.0 µF tantalum capacitor to ground.
5 -OUT A output Channel A inverting bridge output (Amp1A output); also the headphone drive output in single-ended mode.
6 -IN A input Channel A inverting input for stereo input 1 (selected when MUX CTRL is low), with Ri and Rf setting the gain.
7 GND power_in Ground pin; all voltages are measured with respect to the GND pins.
8 +IN A input Channel A non-inverting input.
9 -IN A2 input Channel A inverting input for stereo input 2, selected when MUX CTRL is high.
10 MUX CTRL input Selects stereo input 1 when low or stereo input 2 when high (can be tied to HP-IN to switch gain with headphone insertion).
11 -IN B2 input Channel B inverting input for stereo input 2, selected when MUX CTRL is high.
12 NC unconnected No connection.
13 +IN B input Channel B non-inverting input.
14 BYPASS passive Half-supply bias node; a 1 µF capacitor CB to ground improves PSRR and sets turn-on time and click and pop performance.
15 -IN B input Channel B inverting input for stereo input 1 (selected when MUX CTRL is low), with Ri and Rf setting the gain.
16 -OUT B output Channel B inverting bridge output; the speaker load is connected between -OUT B and +OUT B.
17 VDD power_in Positive supply, 2.0V to 5.5V operating range, bypassed with a local 1.0 µF tantalum capacitor to ground.
18 +OUT B output Channel B non-inverting bridge output.
19 GND power_in Ground pin; all voltages are measured with respect to the GND pins.
20 HP-IN input Headphone control; a voltage between 4V and VDD turns off Amp2A/Amp2B for single-ended headphone mode, 0.8V max keeps bridged mode.
21 EP passive Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package HTSSOP-20
Category Amplifiers/Comparators
Pins 21

CAD (KiCad official)

  • Symbol: LM4873MTEX
  • Footprint: Package_SO:TSSOP-20-1EP_4.4x6.5mm_P0.65mm_EP2.15x3.35mm
  • 3D model: HTSSOP-20, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 1.2 mm nominal TSSOP height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
  • 3D model files: lm4873mtex-etched.step / lm4873mtex-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm4873mtex.step / lm4873mtex.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (33 pp, sha256 3aa470069c66c77f, retrieved 2026-10-08, 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