# SN65HVD31DR

**Texas Instruments** · RS-485 / RS-422 ICs · SOIC-8

SN65HVD31DR 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 | VCC | power_in | 3-V to 3.6-V supply voltage input |
| 2 | R | output | Receive data output |
| 3 | D | input | Driver data input |
| 4 | GND | power_in | Local device ground |
| 5 | Y | tri_state | Driver output (complementary to Z) |
| 6 | Z | tri_state | Driver output (complementary to Y) |
| 7 | B | input | Receiver input (complementary to A) |
| 8 | A | input | Receiver input (complementary to B) |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Interface |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `SN65HVD31DR`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `sn65hvd31dr-etched.step` / `sn65hvd31dr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn65hvd31dr.step` / `sn65hvd31dr.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/sn65hvd31.pdf) (47 pp, sha256 `4f90059e9caf3d07`, retrieved 2026-10-07, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (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/sn65hvd31dr-datasheet.pdf)