# SN75179BD

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

SN75179BD 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 | 5V power supply |
| 2 | R | output | Receiver output; high when differential A-B ≥ +0.2V, low when A-B ≤ -0.2V |
| 3 | D | input | Driver input; controls Y and Z outputs complementarily; logic high/low |
| 4 | GND | power_in | Ground reference |
| 5 | Y | output | Non-inverting driver output; high when D input high; ±60mA output capability |
| 6 | Z | output | Inverted driver output; high when D input low; ±60mA output capability |
| 7 | B | input | Inverted RS485 bus input; 12kΩ minimum input impedance; differential pair with pin 8 (A) |
| 8 | A | input | Non-inverting RS485 bus input; 12kΩ minimum input impedance; differential pair with pin 7 (B) |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `SN75179BD`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `sn75179bd-etched.step` / `sn75179bd-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn75179bd.step` / `sn75179bd.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/sn75179b) (23 pp, sha256 `68cd6a4ac24e706a`, retrieved 2026-10-07, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/sn75179bd-datasheet.pdf)