component
ST485ERBDR
Public Unreviewedby Ray
STMicroelectronics RS-485 / RS-422 ICs, SO-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownST485ERBDR
STMicroelectronics · RS-485 / RS-422 ICs · SO-8
ST485ERBDR from STMicroelectronics, in a SO-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. CMOS logic-level output representing the received differential state on A/B. High-impedance when RE is high (receiver disabled). VOH ≥ 3.5 V @ IO = -4 mA; VOL ≤ 0.4 V @ IO = 4 mA. |
| 2 | ~RE | input | Receiver output enable (active-low). Drive low to enable RO; drive high to place RO in high-impedance. Logic input: VIH ≥ 2.0 V, VIL ≤ 0.8 V, IIN ≈ ±2 µA. |
| 3 | DE | input | Driver output enable (active-high). Drive high to enable the A/B differential driver outputs; drive low to place the driver outputs in high-impedance (3-state). Logic input: VIH ≥ 2.0 V, VIL ≤ 0.8 V. |
| 4 | DI | input | Driver input. CMOS logic-level input; when DE is high, DI = H drives B low and A high, DI = L drives B high and A low. VIH ≥ 2.0 V, VIL ≤ 0.8 V. |
| 5 | GND | power_in | Ground reference (0 V) for supply and all signal levels. |
| 6 | A | bidirectional | Non-inverting receiver input and non-inverting driver output of the RS-485/RS-422 differential bus. Withstands ±15 kV HBM / ±8 kV IEC-1000-4-2 ESD and -7 V to +12 V common-mode bus voltage. Receiver threshold VTH ±0.2 V referenced to B; input resistance ≥ 24 kΩ. |
| 7 | B | bidirectional | Inverting receiver input and inverting driver output of the RS-485/RS-422 differential bus. Withstands ±15 kV HBM / ±8 kV IEC-1000-4-2 ESD and -7 V to +12 V common-mode bus voltage. Complementary to A. |
| 8 | VCC | power_in | Supply voltage input, nominal 5 V (absolute maximum 7 V). Decouple locally to GND. Typical no-load supply current 300 µA (VDE = 0 V). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SO-8 |
| Category | Interface |
| Pins | 8 |
Ordering variants
Same part, different packaging or reel option.
ST485ERBDR
CAD (KiCad official)
- Symbol:
ST485ERBDR - Footprint:
Package_SO:TI_SO-PowerPAD-8 - 3D model: SO-8 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: STMicroelectronics datasheet (19 pp, sha256
6a5826d2bdc7896c, 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).