component
LM4873MTEX
Public Made by Adomby adom
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm4873mtex.step/lm4873mtex.glbare 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, primaryclaude-sonnet-5-5(text+vision), consensusclaude-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).
# 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](https://www.ti.com/cn/lit/gpn/lm4873) (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](docs/lm4873mtex-datasheet.pdf)