# SP485EN

**UMW** · RS-485 / RS-422 ICs · SOP-8

SP485EN from UMW, in a SOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | RO | output | Receiver Output. Logic-level output of the differential receiver. When RE is low and (A-B) > +0.2V, RO=1; when (A-B) < -0.2V, RO=0. VOH >= 3.5V at IO=-4mA; VOL <= 0.4V at IO=4mA. Enters high-impedance state when RE is high. |
| 2 | RE | input | Receiver Output Enable (active-low). When RE=0, the receiver output RO is enabled; when RE=1, RO is placed in a high-impedance (tri-state) condition. VIH >= 2V, VIL <= 0.8V, input current +/-2 uA max. |
| 3 | DE | input | Driver Output Enable (active-high). When DE=1, the differential driver outputs A and B are enabled; when DE=0, both A and B are placed in a high-impedance state. VIH >= 2V, VIL <= 0.8V. |
| 4 | DI | input | Driver Input. Logic-level input that drives the differential bus outputs. When DE=1 and DI=1, A=1 and B=0; when DE=1 and DI=0, A=0 and B=1. VIH >= 2V, VIL <= 0.8V, input current +/-2 uA max. |
| 5 | GND | power_in | Ground reference (0V) for both the logic and the differential bus interface. |
| 6 | A | bidirectional | Non-inverting driver output / non-inverting receiver input (RS-485/RS-422 bus line A). Withstands -7V to +13V common-mode. Receiver threshold VTH = -0.2V to +0.2V (differential A-B). Input resistance >= 12 kOhm. Driver differential output >= 1.5V into a 27 Ohm load. |
| 7 | B | bidirectional | Inverting driver output / inverting receiver input (RS-485/RS-422 bus line B). Withstands -7V to +13V common-mode. Complementary to line A. Input resistance >= 12 kOhm. |
| 8 | VCC | power_in | Positive supply input. Single 5V supply (4.75V to 5.25V, +/-5%). Absolute maximum 7V. Quiescent supply current typically 900 uA (max). |

## Key specifications

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

## Ordering variants

Same part, different packaging or reel option.

- `SP485EN`

## CAD (KiCad official)

- Symbol: `SP485EN`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `sp485en-etched.step` / `sp485en-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sp485en.step` / `sp485en.glb` are the bare package body.

## 3D model downloads

Two STEP files. Same geometry, different body top:

| File | Size | Use it when |
|---|---|---|
| [`sp485en.step`](sp485en.step) | 122 KB | You want the bare part, or you mark your own boards. |
| [`sp485en-etched.step`](sp485en-etched.step) | 1.7 MB | You want the part with `SP485EN` already on it. |

The marking in the etched file is real recessed geometry cut into the solid, not a
texture or a decal: 424 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/sp485en-datasheet.pdf) (9 pp, sha256 `ff31376d6581230b`, 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/sp485en-datasheet.pdf)