# ST4485EBDR

**STMicroelectronics** · RS-485 / RS-422 ICs · SO-8

ST4485EBDR from STMicroelectronics, in a SO-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 | RO | tri_state | Receiver output; high when differential input A-B > 200 mV, low when A-B < -200 mV, high impedance when RE is high. |
| 2 | RE | input | Receiver enable (active low); enables receiver output when low, device enters shutdown when high with DE low. |
| 3 | DE | input | Driver enable (active high); enables driver outputs when high, device enters shutdown when low with RE high. |
| 4 | DI | input | Driver input; low forces A low and B high, high forces A high and B low; voltage range -0.3 to 7 V. |
| 5 | GND | power_in | Ground; 0 V reference. |
| 6 | A | bidirectional | Non-inverting driver output and receiver input; ±14 V rated, common mode input range -7 to 12 V. |
| 7 | B | bidirectional | Inverting driver output and receiver input; ±14 V rated, common mode input range -7 to 12 V. |
| 8 | VCC | power_in | Power supply; operating range 3.0 to 3.6 V, absolute maximum 7 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SO-8 |
| Category | Interface |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `ST4485EBDR`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SO-8 (KiCad packages3D, STEP)
- 3D model files: `st4485ebdr-etched.step` / `st4485ebdr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `st4485ebdr.step` / `st4485ebdr.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [STMicroelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589943742560821248) (18 pp, sha256 `25a825ddfb7c7a4b`, 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/st4485ebdr-datasheet.pdf)