# SN75ALS191P

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

SN75ALS191P from Texas Instruments, in a PDIP-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 | 5 V power supply positive terminal; recommended supply is 4.75 V to 5.25 V (5 V nominal) with an absolute maximum of 7 V. |
| 2 | 1A | input | Single-ended data input for channel 1, TTL and CMOS compatible, with VIH of at least 2 V and VIL of at most 0.8 V. |
| 3 | 2A | input | Single-ended data input for channel 2, TTL and CMOS compatible, with VIH of at least 2 V and VIL of at most 0.8 V. |
| 4 | GND | power_in | Device ground terminal; all voltages are referenced to network ground. |
| 5 | 2Z | output | Inverting differential driver output for channel 2; it is low when input 2A is high and high when 2A is low, per the function table. |
| 6 | 2Y | output | Non-inverting differential driver output for channel 2; it follows input 2A (high when 2A is high, low when 2A is low) per the function table. |
| 7 | 1Z | output | Inverting differential driver output for channel 1; it is low when input 1A is high and high when 1A is low, per the function table. |
| 8 | 1Y | output | Non-inverting differential driver output for channel 1; it follows input 1A (high when 1A is high, low when 1A is low) per the function table. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `SN75ALS191P`
- Footprint: `Package_DIP:DIP-8_W7.62mm`
- 3D model: PDIP-8 (KiCad packages3D, STEP)
- 3D model files: `sn75als191p-etched.step` / `sn75als191p-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn75als191p.step` / `sn75als191p.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/sn75als191) (20 pp, sha256 `5f3d52313d5ecc3b`, 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-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/sn75als191p-datasheet.pdf)