# SN75C189AD

**Texas Instruments** · RS232 ICs · SOIC-14

SN75C189AD from Texas Instruments, in a SOIC-14. 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 | 1A | input | Receiver 1 input; accepts RS-232 signals from -25 V to +25 V with on-chip 1 µs noise filter |
| 2 | 1 CONT | input | Receiver 1 response-control terminal for input threshold voltage adjustment (±1 mA) |
| 3 | 1Y | output | Receiver 1 push-pull output; logic high when input open or shorted to ground |
| 4 | 2A | input | Receiver 2 input; accepts RS-232 signals from -25 V to +25 V with on-chip 1 µs noise filter |
| 5 | 2 CONT | input | Receiver 2 response-control terminal for input threshold voltage adjustment (±1 mA) |
| 6 | 2Y | output | Receiver 2 push-pull output; logic high when input open or shorted to ground |
| 7 | GND | power_in | Ground reference (0 V) |
| 8 | 3Y | output | Receiver 3 push-pull output; logic high when input open or shorted to ground |
| 9 | 3 CONT | input | Receiver 3 response-control terminal for input threshold voltage adjustment (±1 mA) |
| 10 | 3A | input | Receiver 3 input; accepts RS-232 signals from -25 V to +25 V with on-chip 1 µs noise filter |
| 11 | 4Y | output | Receiver 4 push-pull output; logic high when input open or shorted to ground |
| 12 | 4 CONT | input | Receiver 4 response-control terminal for input threshold voltage adjustment (±1 mA) |
| 13 | 4A | input | Receiver 4 input; accepts RS-232 signals from -25 V to +25 V with on-chip 1 µs noise filter |
| 14 | VCC | power_in | Supply voltage; 5 V nominal with 4.5 V to 6 V operating range |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-14 |
| Category | Interface |
| Pins | 14 |

## CAD (KiCad official)

- Symbol: `SN75C189AD`
- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`
- 3D model: SOIC-14 (KiCad packages3D, STEP)
- 3D model files: `sn75c189ad-etched.step` / `sn75c189ad-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn75c189ad.step` / `sn75c189ad.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/cn/lit/ds/symlink/sn75c189a.pdf) (24 pp, sha256 `4d415b3c312c0209`, retrieved 2026-10-05, tier: lcsc)
- **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/sn75c189ad-datasheet.pdf)