SIT3490EESA

@@ -0,0 +1,49 @@+# SIT3490EESA++**SIT** · RS-485 / RS-422 ICs · SOP-8++SIT3490EESA 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 | VCC | power_in | Positive supply input. Operating range 3.0V to 5.5V (absolute max +7V). Typical supply current ICC = 240µA (max 400µA). Bypass locally to GND. |+| 2 | RO | output | Receiver output (CMOS logic). RO is high when A−B ≥ +200mV and low when A−B ≤ −200mV. VOH ≥ VCC−1.5V at −4mA; VOL ≤ 0.4V at +4mA. |+| 3 | DI | input | Driver input (CMOS logic). A low on DI forces Y low and Z high; a high on DI forces Y high and Z low. VIH ≥ 2.0V, VIL ≤ 0.8V, input leakage ±2µA. |+| 4 | GND | power_in | Device ground. Reference for all voltages on the part. |+| 5 | Y | output | Non-inverting differential driver output to the RS-485/RS-422 bus. Differential swing VOD ≥ 1.5V into RL = 54Ω. ±15kV HBM ESD protected. Includes short-circuit and over-voltage protection. |+| 6 | Z | output | Inverting differential driver output to the RS-485/RS-422 bus. Complementary to Y. ±15kV HBM ESD protected; short-circuit and over-voltage protected. |+| 7 | B | input | Inverting differential receiver input from the RS-485/RS-422 bus. 1/8 unit-load, RIN ≈ 96kΩ. Common-mode range −7V to +12V. ±15kV HBM ESD. |+| 8 | A | input | Non-inverting differential receiver input from the RS-485/RS-422 bus. 1/8 unit-load, RIN ≈ 96kΩ. Common-mode range −7V to +12V. ±15kV HBM ESD. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | SIT |+| Package | SOP-8 |+| Category | Interface |+| Pins | 8 |++## Ordering variants++- `SIT3490EESAEESA`+- `SIT3490EESAEEPA`+- `SIT3490EESAEEUA`++## CAD (KiCad official)++- Symbol: `SIT3490EESA`+- 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/sit3490eesa-datasheet.pdf) (13 pp, sha256 `4e2651818bcb1ad0`, 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/sit3490eesa-datasheet.pdf)

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