HTS221 is in the process of being terminated and is not recommended for new design. The candidate replacement is SHT40-AD1B from Sensirion. A deep-dive transition guide, technical note TN1426, is available on www.st.com, providing a high-level reference to guide the user in replacing STMicroelectronics HTS221 sensor with the SHT4x sensor family from Sensirion as a high-quality alternative. The HTS221 is an ultracompact sensor for relative humidity and temperature. It includes a sensing element and a mixed signal ASIC to provide the measurement information through digital serial interfaces. The sensing element consists of a polymer dielectric planar capacitor structure capable of detecting relative humidity variations and is manufactured using a dedicated ST process. The HTS221 is available in a small top-holed cap land grid array (HLGA) package guaranteed to operate over a temperature range from -40 °C to +120 °C.
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