# LM4906MM

**Texas Instruments** · Audio Amplifiers · VSSOP-8

LM4906MM from Texas Instruments, in a VSSOP-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 | Active-high enable input: pulling it high turns the part on and pulling it low/ground puts it in shutdown (0.1µA typ), and it should be tied to a definite voltage. |
| 2 | GND | power_in | Ground pin, tied to the internal bias and shutdown circuitry. |
| 3 | Gain Select | input | Gain select input that sets the gain to 6dB when low and 12dB when high. |
| 4 | IN- | input | Audio input through a 20kΩ input resistor, coupled via an input capacitor (C2 0.39µF in the reference design). |
| 5 | Vo1 | output | First bridged amplifier output (negative side of the BTL load), biased at half supply. |
| 6 | VDD | power_in | Positive supply, 2.6V to 5.5V operating range, bypassed with a 1µF capacitor placed close to the device. |
| 7 | GND | power_in | Ground pin, connected together with pin 2 to ground. |
| 8 | Vo2 | output | Second bridged amplifier output (positive side of the BTL load), 180° out of phase with Vo1. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `LM4906MM`
- Footprint: `Package_SO:VSSOP-8_2.3x2mm_P0.5mm`
- 3D model: VSSOP-8 (KiCad packages3D, STEP)
- 3D model files: `lm4906mm-etched.step` / `lm4906mm-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm4906mm.step` / `lm4906mm.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/lm4906) (23 pp, sha256 `29b15ecbe81a511b`, retrieved 2026-10-10, 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/lm4906mm-datasheet.pdf)