HT3485ARZ

@@ -0,0 +1,47 @@+# HT3485ARZ++**HTCSEMI** · RS-485 / RS-422 ICs · SOP-8++HT3485ARZ from HTCSEMI, 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. CMOS logic-level output driven from the differential receiver comparing A vs B (threshold ±0.2 V). High-Z (OFF state) when RE is deasserted (high). |+| 2 | RE | input | Receiver output enable pin (active-low, /RE). Drive low to enable the receiver output RO; drive high to place RO in the high-impedance state. With RE high and DE low the part enters shutdown mode. |+| 3 | DE | input | Driver (transmitter) output enable pin (active-high). Drive high to enable the differential driver outputs A/B; drive low to tri-state (OFF state) the driver outputs. |+| 4 | DI | input | Transmitter (driver) input. CMOS logic-level input that sets the differential state of the A/B bus lines when DE is high. VIL ≤ 0.8 V, VIH ≥ 2.0 V. |+| 5 | GND | power_in | Ground / common reference pin (0 V). Return for supply current and reference for all logic-level inputs and outputs. |+| 6 | A | bidirectional | Non-inverting (uncomplemented) RS-485/RS-422 differential I/O line. Serves as driver output when DE=H and as receiver input when RE=L. Withstands -7 V to +12 V bus voltage. |+| 7 | B | bidirectional | Inverting (complemented, /B) RS-485/RS-422 differential I/O line. Serves as driver output when DE=H and as receiver input when RE=L. Withstands -7 V to +12 V bus voltage. |+| 8 | VCC | power_in | Positive supply pin. Recommended operating range 3.0-3.6 V (absolute max 7.0 V). Decouple to GND with a local bypass capacitor. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | HTCSEMI |+| Package | SOP-8 |+| Category | Interface |+| Pins | 8 |++## Ordering variants++- `HT3485ARZARZ`++## CAD (KiCad official)++- Symbol: `HT3485ARZ`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [HTCSEMI datasheet](docs/ht3485arz-datasheet.pdf) (11 pp, sha256 `7ee4385f61d7225d`, 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/ht3485arz-datasheet.pdf)

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