# TPA311DR

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

TPA311DR 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 places the entire device in shutdown mode when held high (IDD = 60 µA, VDD = 5 V). |
| 2 | BYPASS | passive | BYPASS is the tap to the voltage divider for internal mid-supply bias and should be connected to a 0.1-µF to 1-µF capacitor when used as an audio amplifier. |
| 3 | SE/BTL | input | When SE/BTL is held low the TPA311 is in BTL mode, and when held high it is in SE mode. |
| 4 | IN | input | IN is the audio input terminal. |
| 5 | VO+ | output | VO+ is the positive output for BTL and SE modes. |
| 6 | VDD | power_in | VDD is the supply voltage terminal, specified from 2.5 V to 5.5 V. |
| 7 | GND | power_in | GND is the ground connection. |
| 8 | VO- | output | VO- is the negative output in BTL mode and a high-impedance output in SE mode. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `TPA311DR`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `tpa311dr-etched.step` / `tpa311dr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tpa311dr.step` / `tpa311dr.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/lit/ds/symlink/tpa311.pdf) (42 pp, sha256 `4816e4b36e799d10`, retrieved 2026-11-02, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-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/tpa311dr-datasheet.pdf)