GX18B20S

@@ -0,0 +1,44 @@+# GX18B20S++**GXCAS** · Temperature and Humidity Sensor · TO-92S++GX18B20S from GXCAS, in a TO-92S. 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 | GND | power_in | Ground reference for the device. Must be tied to system ground; when the device operates in parasite-power mode the VDD pin must also be tied to GND. |+| 2 | DQ | bidirectional | 1-Wire data input/output. Open-drain bidirectional data line; requires an external ~5 kΩ (typ. shown as 1 kΩ in strong-pullup examples) pull-up to VDD. Also supplies power to the device when used in parasite-power mode (charging the internal CPP capacitor while the bus is high). |+| 3 | VDD | power_in | Optional external supply pin, 2.5 V to 5.5 V. Provides local power to the device; must be grounded when operating in parasite-power mode (device is powered from the DQ line instead). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | GXCAS |+| Package | TO-92S |+| Category | Sensor |+| Pins | 3 |++## Ordering variants++- `GX18B20SS`+- `GX18B20SWS`+- `GX18B20SA`++## CAD (KiCad official)++- Symbol: `GX18B20S`+- Footprint: `Package_TO_SOT_THT:TO-92_Inline`+- 3D model: TO-92S (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [GXCAS datasheet](docs/gx18b20s-datasheet.pdf) (33 pp, sha256 `5ccf9b30c1910e5c`, 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/gx18b20s-datasheet.pdf)

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