SHT21S is a humidity and temperature sensor launched by Sensirion. It is fully calibrated, with SDM interface convertible to analog output, low power consumption, excellent long term stability, and DFN type package which is reflow solderable.
The SHT21S is a 3 × 3 mm DFN humidity and temperature sensor from Sensirion. It provides calibrated, linearized signals in an analog Sigma‑Delta Modulated (SDM) format and is supplied in tape‑and‑reel packaging.
The document details electrical specifications, mechanical dimensions, soldering guidelines, storage conditions, and re‑conditioning procedures, along with conversion formulas for humidity and temperature outputs.
| Resolution (Humidity) | 10 bit |
|---|---|
| Resolution (Temperature) | 12 bit |
| Typical Accuracy (Humidity) | ±2.0 %RH |
| Typical Accuracy (Temperature) | ±0.3 °C |
| Operating Relative Humidity Range | 0 %RH – 100 %RH |
| Power Dissipation | 0.48 mW |
It is supplied in a DFN (Dual Flat No‑leads) package.
Bake at 100‑105 °C at <5 %RH for 10 h, then re‑hydrate at 20‑30 °C at ~75 %RH for 12 h.