The HS3003: The part belongs to the HS300x series, a family of digital humidity and temperature sensors from Renesas Electronics.
What the ±2.5% RH accuracy means on the bench
The HS3003 outputs 14-bit humidity and temperature data over an I²C bus, with a stated accuracy of ±2.5% RH across the full 0 to 100% RH operating range. That accuracy spec covers the sensor element and on-chip calibration — no external compensation or lookup table needed in firmware. Response time is 6 seconds typical, which means the reading settles fast enough for environmental monitoring in HVAC or server-room air handling but is not intended for fast-moving air streams or condensation detection. Operating temperature spans -40°C to 125°C, so the sensor survives reflow soldering and can be placed in airflow paths that see hot exhaust or cold outdoor intake without derating.
Field-swap and integration notes
No separate analog supply pin; the sensor draws its power from the same rail as the digital interface. Surface-mount package in strip form — no socket option, so field replacement requires a hot-air station or reflow oven. The 14-bit I²C address is fixed; confirm it does not conflict with other devices on the same bus before the board spins.