SIT3485ESA

@@ -0,0 +1,47 @@+# SIT3485ESA++**SIT** · RS-485 / RS-422 ICs · SOP-8++SIT3485ESA from SIT, 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. When /RE is low: if A-B >= +200 mV, RO outputs high; if A-B <= -200 mV, RO outputs low. High-Z when receiver is disabled (/RE = high). VOH >= VCC-1.5 V at IOUT = -2.5 mA; VOL <= 0.4 V at IOUT = +2.5 mA. |+| 2 | /RE | input | Receiver output enable, active-low. Low = receiver output enabled (RO active). High = receiver disabled (RO high-impedance). /RE high AND DE low places the device into low-power shutdown mode. VIH >= 2.0 V, VIL <= 0.8 V. |+| 3 | DE | input | Driver output enable, active-high. High = driver A/B outputs enabled. Low = driver outputs high-impedance. DE low AND /RE high enters low-power shutdown. VIH >= 2.0 V, VIL <= 0.8 V. |+| 4 | DI | input | Driver data input. When driver is enabled: DI low drives A low and B high; DI high drives A high and B low. VIH >= 2.0 V, VIL <= 0.8 V, input current +/-2 uA. |+| 5 | GND | power_in | Ground reference (0 V). All voltages referenced to this pin. |+| 6 | A | bidirectional | RS-485 non-inverting bus I/O. Receiver non-inverting input and driver non-inverting output. Common-mode range -7 V to +12 V; receiver input resistance >= 96 kOhm (1/8 unit load). Includes integrated transient protection. |+| 7 | B | bidirectional | RS-485 inverting bus I/O. Receiver inverting input and driver inverting output. Common-mode range -7 V to +12 V; receiver input resistance >= 96 kOhm (1/8 unit load). Includes integrated transient protection. |+| 8 | VCC | power_in | Supply voltage input. Operating range 3.0 V to 3.6 V (nominal 3.3 V). Absolute max +7 V. Typical supply current 520-540 uA active; 0.5 uA in shutdown. Decouple with a 0.1 uF ceramic capacitor to GND. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | SIT |+| Package | SOP-8 |+| Category | Interface |+| Pins | 8 |++## Ordering variants++- `SIT3485ESAESA`++## CAD (KiCad official)++- Symbol: `SIT3485ESA`+- 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:** [SIT datasheet](docs/sit3485esa-datasheet.pdf) (13 pp, sha256 `f9261a7d13245d2a`, 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/sit3485esa-datasheet.pdf)

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