# LM4890MM

**Texas Instruments** · Audio Power OpAmps · VSSOP-8

LM4890MM 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-low shutdown input; logic low (below 0.4V max) turns off the bias circuitry for about 0.1µA typical shutdown current, and logic high (1.2V min) enables the amplifier. |
| 2 | BYPASS | passive | Half-supply bypass pin that needs an external capacitor (1.0µF recommended) for half-supply filtering, PSRR and turn-on click and pop performance. |
| 3 | +IN | input | Non-inverting input of the first amplifier. |
| 4 | -IN | input | Inverting input of the first amplifier, driven through RIN, which sets the gain with Rf as AVD = 2*(Rf/RIN) and forms a high-pass filter with CIN. |
| 5 | Vo1 | output | Output of the first amplifier, one side of the bridged (BTL) load, in antiphase with Vo2 and biased at half-supply. |
| 6 | VDD | power_in | Positive supply, operating range 2.2V to 5.5V, bypassed with a capacitor placed close to the pin. |
| 7 | GND | power_in | Ground pin. |
| 8 | Vo2 | output | Output of the second amplifier, the other side of the bridged (BTL) load, a unity-gain inversion of Vo1 biased at half-supply. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VSSOP-8 |
| Category | Operational Amplifier/Comparator |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `LM4890MM`
- Footprint: `Package_SO:VSSOP-8_2.3x2mm_P0.5mm`
- 3D model: VSSOP-8 (KiCad packages3D, STEP)
- 3D model files: `lm4890mm-etched.step` / `lm4890mm-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm4890mm.step` / `lm4890mm.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/lm4890) (40 pp, sha256 `13ec1db10db71b3a`, 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/lm4890mm-datasheet.pdf)