SIT3490EEUA

@@ -0,0 +1,49 @@+# SIT3490EEUA++**SIT** · RS-485 / RS-422 ICs · MSOP-8++SIT3490EEUA from SIT, in a MSOP-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, 3.0 V to 5.5 V nominal (absolute max +7 V). Bypass locally with a 0.1 uF ceramic capacitor to GND. |+| 2 | RO | output | Receiver output (CMOS logic). RO is high when A-B >= +200 mV and low when A-B <= -200 mV. Drives VOH >= VCC-1.5 V at IOUT = -4 mA and VOL <= 0.4 V at IOUT = +4 mA. |+| 3 | DI | input | Driver input (CMOS logic, VIH >= 2.0 V, VIL <= 0.8 V). A low on DI forces output Y low and Z high; a high on DI forces Y high and Z low. |+| 4 | GND | power_in | Ground reference for supply and all signals. |+| 5 | Y | output | Non-inverting driver output. Connect to the RS-485/RS-422 differential bus. Driver has short-circuit current limiting (35 mA to 250 mA to 0-12 V and -35 mA to -250 mA to -7-0 V) and ±15 kV HBM ESD protection. |+| 6 | Z | output | Inverting driver output. Connect to the RS-485/RS-422 differential bus opposite polarity from Y. ±15 kV HBM ESD protected. |+| 7 | B | input | Inverting receiver input from the RS-485/RS-422 differential bus. 1/8 unit-load (RIN >= 96 kΩ); tolerates -7 V to +12 V common-mode. ±15 kV HBM ESD protected. |+| 8 | A | input | Non-inverting receiver input from the RS-485/RS-422 differential bus. 1/8 unit-load (RIN >= 96 kΩ); tolerates -7 V to +12 V common-mode. ±15 kV HBM ESD protected. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | SIT |+| Package | MSOP-8 |+| Category | Interface |+| Pins | 8 |++## Ordering variants++- `SIT3490EEUAEEUA`+- `SIT3490EEUAEESA`+- `SIT3490EEUAEEPA`++## CAD (KiCad official)++- Symbol: `SIT3490EEUA`+- Footprint: `Package_SO:MSOP-8_3x3mm_P0.65mm`+- 3D model: MSOP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [SIT datasheet](docs/sit3490eeua-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/sit3490eeua-datasheet.pdf)

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