GB490H

@@ -0,0 +1,44 @@+# GB490H++**GEC** · RS-485 / RS-422 ICs · SOP-8++GB490H from GEC, 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, 3.0 V to 5.25 V (3.3 V/5 V nominal). Bypass to GND with a 0.1 µF ceramic capacitor. Quiescent supply current ICC ≈ 0.35 mA typ, 1 mA max. |+| 2 | RO | output | Receiver output (CMOS). Drives high when V(A)-V(B) ≥ -50 mV and low when V(A)-V(B) ≤ -200 mV. Fail-safe: outputs high when receiver inputs are open or shorted. VOH ≥ VCC-0.6 V at -4 mA; VOL ≤ 0.4 V at 4 mA. |+| 3 | DI | input | Driver input (CMOS logic). DI=high forces Y high and Z low; DI=low forces Y low and Z high. VIH ≥ 2.0 V, VIL ≤ 0.8 V, 100 mV hysteresis, ±1 µA input leakage. |+| 4 | GND | power_in | Device ground reference. All voltages are referenced to this pin. |+| 5 | Y | output | RS-422/RS-485 differential bus non-inverting driver output. Follows DI (Y=DI). Supports ±15 kV HBM and ±12 kV IEC 61000-4-2 contact-discharge ESD. Absolute bus voltage rating -8 V to +13 V. |+| 6 | Z | output | RS-422/RS-485 differential bus inverting driver output. Complement of Y (Z = /DI). Supports ±15 kV HBM and ±12 kV IEC 61000-4-2 contact-discharge ESD. Absolute bus voltage rating -8 V to +13 V. |+| 7 | B | input | RS-422/RS-485 differential bus receiver inverting input. Input impedance 96 kΩ min (1/8 unit load), allowing up to 256 nodes on the bus. Common-mode range -7 V to +12 V. Supports ±15 kV HBM ESD. |+| 8 | A | input | RS-422/RS-485 differential bus receiver non-inverting input. Input impedance 96 kΩ min (1/8 unit load). Common-mode range -7 V to +12 V. Receiver threshold VTH = -200 mV to -50 mV. Supports ±15 kV HBM ESD. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | GEC |+| Package | SOP-8 |+| Category | Interface |+| Pins | 8 |++## CAD (KiCad official)++- Symbol: `GB490H`+- 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:** [GEC datasheet](docs/gb490h-datasheet.pdf) (9 pp, sha256 `79b49ce9d1da54d4`, 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/gb490h-datasheet.pdf)

@@ -0,0 +1,34 @@+{+  "slug": "gb490h",+  "version": "0.1.0",+  "type": "component",+  "description": "GEC RS-485 / RS-422 ICs, SOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.",+  "tags": [+    "component",+    "interface",+    "gb490h"+  ],+  "dependencies": {},+  "hero": {+    "type": "image",+    "path": "docs/hero.png"+  },+  "files": [+    "page.json",+    "README.md",+    "gb490h.kicad_sym",+    "gb490h.kicad_mod",+    "gb490h.glb",+    "gb490h.step",+    "gb490h.lbr",+    "docs/hero.png",+    "docs/gb490h-datasheet.pdf",+    "viewers/symbol.html",+    "viewers/footprint.html"+  ],+  "visibility": "public",+  "author": {+    "name": "Ray",+    "email": "[email protected]"+  }+}\ No newline at end of file