# SN75ALS174ADWR

**Texas Instruments** · RS-485 / RS-422 ICs · SOIC-20-300mil

SN75ALS174ADWR from Texas Instruments, in a SOIC-20-300mil. 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 | Driver 1 logic input; high level 2 V to VCC, low level 0 to 0.8 V. |
| 2 | 1Y | tri_state | Driver 1 non-inverting differential output, high-impedance when 1,2EN is low. |
| 3 | NC | unconnected | No internal connection. |
| 4 | 1Z | tri_state | Driver 1 inverting differential output, high-impedance when 1,2EN is low. |
| 5 | 1,2EN | input | Active-high enable for drivers 1 and 2; low puts outputs 1Y/1Z/2Y/2Z in high impedance. |
| 6 | 2Z | tri_state | Driver 2 inverting differential output, high-impedance when 1,2EN is low. |
| 7 | NC | unconnected | No internal connection. |
| 8 | 2Y | tri_state | Driver 2 non-inverting differential output, high-impedance when 1,2EN is low. |
| 9 | 2A | input | Driver 2 logic input; high level 2 V to VCC, low level 0 to 0.8 V. |
| 10 | GND | power_in | Ground; all voltage values are referenced to network GND. |
| 11 | 3A | input | Driver 3 logic input; high level 2 V to VCC, low level 0 to 0.8 V. |
| 12 | 3Y | tri_state | Driver 3 non-inverting differential output, high-impedance when 3,4EN is low. |
| 13 | NC | unconnected | No internal connection. |
| 14 | 3Z | tri_state | Driver 3 inverting differential output, high-impedance when 3,4EN is low. |
| 15 | 3,4EN | input | Active-high enable for drivers 3 and 4; low puts outputs 3Y/3Z/4Y/4Z in high impedance. |
| 16 | 4Z | tri_state | Driver 4 inverting differential output, high-impedance when 3,4EN is low. |
| 17 | NC | unconnected | No internal connection. |
| 18 | 4Y | tri_state | Driver 4 non-inverting differential output, high-impedance when 3,4EN is low. |
| 19 | 4A | input | Driver 4 logic input; high level 2 V to VCC, low level 0 to 0.8 V. |
| 20 | VCC | power_in | Supply voltage, 4.75 V to 5.25 V recommended (absolute maximum 7 V). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-20-300mil |
| Category | Interface |
| Pins | 20 |

## CAD (KiCad official)

- Symbol: `SN75ALS174ADWR`
- Footprint: `Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm`
- 3D model: SOIC-20-300mil (KiCad packages3D, STEP)
- 3D model files: `sn75als174adwr-etched.step` / `sn75als174adwr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn75als174adwr.step` / `sn75als174adwr.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/sn75als174a) (22 pp, sha256 `ec23df57df066878`, retrieved 2026-10-08, 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/sn75als174adwr-datasheet.pdf)