SIT490EESA

@@ -0,0 +1,50 @@+# SIT490EESA++**SIT** · RS-485 / RS-422 ICs · SOP-8++SIT490EESA 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, 4.5 V ≤ VCC ≤ 5.5 V (absolute max +7 V). Typical supply current ICC = 220 µA (max 400 µA) with DI = 0 or VCC. |+| 2 | RO | output | Receiver output. Outputs logic high when the differential receiver input (A−B) ≥ −10 mV, and logic low when (A−B) ≤ −200 mV. Fail-safe high when inputs are open or shorted. VOH ≥ VCC−1.5 V at IOUT = −4 mA; VOL ≤ 0.4 V at IOUT = +4 mA. |+| 3 | DI | input | Driver data input. A logic low on DI forces Y low and Z high; a logic high on DI forces Y high and Z low. VIH ≥ 2.0 V, VIL ≤ 0.8 V, input leakage ±2 µA. |+| 4 | GND | power_in | Device ground reference. All voltages are referenced to this pin. |+| 5 | Y | output | Non-inverting (in-phase) driver output for the RS-485/RS-422 bus. Differential output magnitude 1.5-VCC V into a 27 Ω load (2.0-VCC V into 50 Ω). Short-circuit protected 35-250 mA. ±15 kV HBM ESD protection. |+| 6 | Z | output | Inverting driver output for the RS-485/RS-422 bus. Complementary to Y. Short-circuit protected 35-250 mA. ±15 kV HBM ESD protection. |+| 7 | B | input | Inverting receiver differential input from the RS-485/RS-422 bus. Common-mode range −7 V to +12 V, 1/8-unit-load input impedance (RIN ≥ 96 kΩ). Absolute max −8 V to +13 V. ±15 kV HBM ESD protection. |+| 8 | A | input | Non-inverting receiver differential input from the RS-485/RS-422 bus. Common-mode range −7 V to +12 V, 1/8-unit-load input impedance (RIN ≥ 96 kΩ). Absolute max −8 V to +13 V. ±15 kV HBM ESD protection. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | SIT |+| Package | SOP-8 |+| Category | Interface |+| Pins | 8 |++## Ordering variants++- `SIT490EESAESA`+- `SIT490EESAEPA`+- `SIT490EESAEUA`++## CAD (KiCad official)++- Symbol: `SIT490EESA`+- 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/sit490eesa-datasheet.pdf) (9 pp, sha256 `a23c5cb34e7cf8bc`, retrieved 2026-08-17, tier: lcsc)+- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.+- **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/sit490eesa-datasheet.pdf)

@@ -0,0 +1,34 @@+{+  "slug": "sit490eesa",+  "version": "0.1.0",+  "type": "component",+  "description": "SIT RS-485 / RS-422 ICs, SOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.",+  "tags": [+    "component",+    "interface",+    "sit490eesa"+  ],+  "dependencies": {},+  "hero": {+    "type": "image",+    "path": "docs/hero.png"+  },+  "files": [+    "page.json",+    "README.md",+    "sit490eesa.kicad_sym",+    "sit490eesa.kicad_mod",+    "sit490eesa.glb",+    "sit490eesa.step",+    "sit490eesa.lbr",+    "docs/hero.png",+    "docs/sit490eesa-datasheet.pdf",+    "viewers/symbol.html",+    "viewers/footprint.html"+  ],+  "visibility": "public",+  "author": {+    "name": "Ray",+    "email": "[email protected]"+  }+}\ No newline at end of file