Stackpole’s RNCU1206 provides tolerances as low as 0.1% and TCR’s as low as 10ppm along with a 1W power.
Vishay Intertechnology's VCNL36828P combines a photodiode, application-specific integrated circuit (ASIC), 16-bit ADC, and smart dual I²C slave address in a 2.0mm by 1.0mm by 0.5mm surface-mount package.
Würth Elektronik's MEMS (Micro-Electro-Mechanical System) sensor measures with a precision of ±1.8% RH in the 20% to 80% relative humidity range.