# SP3485EEN

**UMW** · RS-485 / RS-422 ICs · SOP-8

SP3485EEN from UMW, in a SOP-8. Pinout and pin descriptions extracted from the datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | RO | output | Receiver output. When /RE is low: RO = high if (A-B) >= 200 mV, RO = low if (A-B) <= -200 mV. High-impedance when receiver is disabled. |
| 2 | /RE | input | Active-low receiver output enable. When /RE = low, receiver is enabled and RO is driven. When /RE = high, receiver output is high-impedance. If /RE = high AND DE = low, the device enters low-power shutdown mode. |
| 3 | DE | input | Driver output enable. When DE = high, driver outputs (A, B) are enabled. When DE = low, driver outputs are high-impedance. If /RE = high AND DE = low, the device enters low-power shutdown mode. |
| 4 | DI | input | Driver data input. When DE = high: DI low forces non-inverting driver output A low and inverting output B high; DI high forces A high and B low. |
| 5 | GND | power_in | Ground reference for the device. All voltages are referenced to this pin. |
| 6 | A | bidirectional | Non-inverting RS-485 bus pin: non-inverting receiver input and non-inverting driver output. Bus-side voltage tolerance -7 V to +13 V; receiver input resistance >= 96 kΩ (1/8 unit load). |
| 7 | B | bidirectional | Inverting RS-485 bus pin: inverting receiver input and inverting driver output. Bus-side voltage tolerance -7 V to +13 V; receiver input resistance >= 96 kΩ (1/8 unit load). |
| 8 | VCC | power_in | Supply voltage input, 3.0 V to 3.6 V (nominal 3.3 V). Absolute maximum 7 V. Typical supply current 520-540 µA. Bypass locally with a 0.1 µF capacitor to GND. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UMW |
| Package | SOP-8 |
| Category | Interface |
| Pins | 8 |

## Ordering variants

Same part, different packaging or reel option.

- `SP3485EEN`

## CAD (KiCad official)

- Symbol: `SP3485EEN`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `sp3485een-etched.step` / `sp3485een-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sp3485een.step` / `sp3485een.glb` are the bare package body.

## 3D model downloads

Two STEP files. Same geometry, different body top:

| File | Size | Use it when |
|---|---|---|
| [`sp3485een.step`](sp3485een.step) | 122 KB | You want the bare part, or you mark your own boards. |
| [`sp3485een-etched.step`](sp3485een-etched.step) | 2.1 MB | You want the part with `SP3485EEN` already on it. |

The marking in the etched file is real recessed geometry cut into the solid, not a
texture or a decal: 512 faces against 147 in the bare model. It
survives export, section views, and rendering in any CAD tool, and it drops straight
into KiCad or Fusion with no extra setup.

## Provenance

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

- **Datasheet:** [UMW datasheet](docs/sp3485een-datasheet.pdf) (18 pp, sha256 `06fdac69a6ccf46e`, retrieved 2026-08-17, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/sp3485een-datasheet.pdf)