# GX18B20

**GXCAS** · Temperature Sensors · TO-92

GX18B20 from GXCAS, in a TO-92. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | GND | power_in | Ground pin for the device. |
| 2 | DQ | bidirectional | Data input/output and open-drain 1-Wire interface pin; it also supplies power to the device in parasite power mode. |
| 3 | VDD | power_in | Optional supply pin; VDD must be grounded for operation in parasite power mode, and the supply voltage range is 2.5V to 5.5V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | GXCAS |
| Package | TO-92 |
| Category | Sensors |
| Pins | 3 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| supply voltage | VDD | 2.5 |  | 5.5 | V | local power supply | 22 |
| Pull up supply voltage | VPU | 2.5 |  | 5.5 | V | parasitic power supply | 22 |
| Pull up supply voltage | VPU | 2.5 |  |  | V | local power | 22 |
| temperature error | tERR | -0.4 |  | 0.4 | ℃ | -10℃~+85℃ | 22 |
| temperature error | tERR | -1.2 |  | 1.2 | ℃ | -55℃~+125℃ | 22 |
| input logic low | VIL | -0.3 |  | 0.8 | V |  | 22 |
| input logic high | VIH | 2.2 |  |  | V | local power | 22 |
| input logic high | VIH | 2.5 |  |  | V | parasitic power | 22 |
| stand-by current | IDDS |  | 750 | 1000 | nA |  | 22 |
| Working current | IDD |  | 1 | 1.5 | mA | VDD = 5V | 22 |
| Drift |  | -0.2 |  | 0.2 | ℃ | 1000-hour stress test at +125°C with VDD = 5.5V | 22 |
| NV Write Cycle Time | tWR |  | 8 | 12 | ms |  | 23 |
| Time to Strong Pullup On | tSPON |  |  | 10 | µs | Start Convert T command issued | 23 |
| Time Slot | tSLOT | 60 |  | 120 | µs |  | 23 |
| Write 0 Low Time | tLOW0 | 60 |  | 120 | µs |  | 23 |
| Write 1 Low Time | tLOW1 | 1 |  | 15 | µs |  | 23 |
| Presence-Detect High | tPDHIGH | 15 |  | 60 | µs |  | 23 |
| Presence-Detect Low | tPDLOW | 60 |  | 240 | µs |  | 23 |
| Temperature Conversion Time | tCONV |  |  | 750 | ms | 12-bit resolution | 23 |
| Voltage Range on Any Pin Relative to Ground |  | -0.5 |  | 6 | V |  | 22 |
| Operating Temperature Range |  | -55 |  | 125 | °C |  | 22 |
| Storage Temperature Range |  | -55 |  | 125 | °C |  | 22 |

## CAD (KiCad official)

- Symbol: `GX18B20`
- Footprint: `Package_TO_SOT_THT:TO-92_Inline`
- 3D model: TO-92 (KiCad packages3D, STEP)
- 3D model files: `gx18b20-etched.step` / `gx18b20-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `gx18b20.step` / `gx18b20.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [GXCAS datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588888403966906368) (33 pp, sha256 `5ccf9b30c1910e5c`, retrieved 2026-10-19, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/gx18b20-datasheet.pdf)