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gx18b20u

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by Ray

GXCAS Temperature and Humidity Sensor, MSOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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README

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GX18B20U

GXCAS · Temperature and Humidity Sensor · MSOP-8

GX18B20U from GXCAS, 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 DQ bidirectional Data Input/Output. Open-drain 1-Wire interface pin (requires ~1kΩ external pull-up to VPU). Also supplies parasite power to the device (2.5V-5.5V) when VDD is tied to GND. VIL max 0.8V; VIH min 2.2V (local power) / 2.5V (parasite).
2 N.C. unconnected No Connection. Leave floating or tie according to board practice.
3 N.C. unconnected No Connection.
4 GND power_in Ground reference for the device (0V). All voltages are referenced to this pin.
5 N.C. unconnected No Connection.
6 N.C. unconnected No Connection.
7 N.C. unconnected No Connection.
8 VDD power_in Optional external power supply input, 2.5V to 5.5V. When operating in parasite-power mode (power derived from DQ), VDD MUST be tied to GND. Absolute max voltage on any pin is -0.5V to +6.0V.

Key specifications

Parameter Value
Manufacturer GXCAS
Package MSOP-8
Category Sensor
Pins 8

Ordering variants

  • GX18B20U-T&R
  • GX18B20UH-T&R
  • GX18B20UP-T&R
  • GX18B20UGX18B20Z-T&R
  • GX18B20UGX18B20ZH-T&R
  • GX18B20UGX18B20ZP-T&R
  • GX18B20UGX18B20-Bu
  • GX18B20UGX18B20H
  • GX18B20UGX18B20S-Bu
  • GX18B20UGX18B20WS-Bu
  • GX18B20UGX18B20WSH-Bu
  • GX18B20UGX1820T-Bu
  • GX18B20UGX18B20W-Bu
  • GX18B20UGX18B20WH-Bu

CAD (KiCad official)

  • Symbol: GX18B20U
  • 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: GXCAS datasheet (None 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

Symbol & Footprint

Schematic Symbol

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PCB Footprint

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