ST485BDR

@@ -0,0 +1,50 @@+# ST485BDR++**STMicroelectronics** · RS-485 / RS-422 ICs · SOIC-8++ST485BDR from STMicroelectronics, in a SOIC-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-level logic output that reflects the differential polarity of A vs B; high when (A-B) >= +0.2 V, low when (A-B) <= -0.2 V. High-impedance (tri-state) when RE is high. VOH >= 3.5 V at IO = -4 mA; VOL <= 0.4 V at IO = 4 mA. |+| 2 | RE | input | Receiver output enable (active-low). Drive low to enable the receiver output RO; drive high to place RO in high-impedance state. Input high >= 2.0 V, input low <= 0.8 V; input leakage ±2 µA. |+| 3 | DE | input | Driver output enable (active-high). Drive high to enable the differential driver outputs A/B; drive low to place A and B in high-impedance state (disables driver, allowing bus sharing). Input high >= 2.0 V, input low <= 0.8 V. |+| 4 | DI | input | Driver input. CMOS-level TTL-compatible logic input; when DE is high, DI high forces A high and B low, DI low forces A low and B high. Input high >= 2.0 V, input low <= 0.8 V; leakage ±2 µA. |+| 5 | GND | power_in | Ground / 0 V reference for the device. |+| 6 | A | bidirectional | Non-inverting differential bus pin: non-inverting receiver input and non-inverting driver output. Tolerates -7 V to +12 V common-mode; ±14 V absolute maximum. Receiver input impedance >= 24 kΩ. |+| 7 | B | bidirectional | Inverting differential bus pin: inverting receiver input and inverting driver output. Tolerates -7 V to +12 V common-mode; ±14 V absolute maximum. Receiver input impedance >= 24 kΩ. |+| 8 | VCC | power_in | Positive supply. Nominal 5 V ± 5 % (single supply). Absolute maximum 7 V. Quiescent supply current 300 µA typ. (unloaded, driver disabled). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | STMicroelectronics |+| Package | SOIC-8 |+| Category | Interface |+| Pins | 8 |++## Ordering variants++- `ST485BDRBDR`+- `ST485BDRCDR`+- `ST485BDRBN`+- `ST485BDRCN`++## CAD (KiCad official)++- Symbol: `ST485BDR`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOIC-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [STMicroelectronics datasheet](https://www.st.com/resource/en/datasheet/st485bdr.pdf) (19 pp, sha256 `16bf6365fefdf622`, retrieved 2026-08-17, tier: manufacturer)+- **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/st485bdr-datasheet.pdf)

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