# THVD1449DR

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

THVD1449DR 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 | R | output | Receiver data output. |
| 2 | RE | input | Receiver enable, active low, with 2 MΩ internal pull-up. |
| 3 | DE | input | Driver enable, active high. |
| 4 | D | input | Driver data input. |
| 5 | GND | power_in | Device ground. |
| 6 | A | bidirectional | Bus I/O port A (complementary to B); absolute maximum bus voltage range is -15 V to 15 V. |
| 7 | B | bidirectional | Bus I/O port B (complementary to A); absolute maximum bus voltage range is -15 V to 15 V. |
| 8 | VCC | power_in | 3.3-V to 5-V supply for the device; absolute maximum is 7 V. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `THVD1449DR`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `thvd1449dr-etched.step` / `thvd1449dr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `thvd1449dr.step` / `thvd1449dr.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/thvd1449.pdf) (30 pp, sha256 `f5c3d3d8a4ebdcfc`, retrieved 2026-10-03, 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/thvd1449dr-datasheet.pdf)