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2 parts compared · 15 differing specs across 15 total parameters.

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Specification differences for SHT21, SHT31
Parameter
Operating temperature-40°C ~ 125°C-
Supply voltage2.1V ~ 3.6V-
Case6-TDFN Exposed PadDFN-8 (SHT3x) / DFN-4 (SHT4x)
PackageTape & Reel (TR) Cut Tape (CT)-
Accuracy±2% RH-
Component Category-Humidity & Temperature Sensors
Humidity Range0 ~ 100% RH-
Market Reality-The Sensirion SHT family is the reference humidity sensor of HVAC, medical devices, weather stations and every environmental logger: four generations of the same promise - a factory-calibrated digital RH/temperature pair on I2C - with the accuracy ladder running from the SHT21 baseline to the SHT45 top grade. Across the generations nothing physical carried over: the SHT3x lives in a 2.5mm DFN-8 with an address pin and a 5V-tolerant supply, while the SHT4x generation shrank to a 1.5mm DFN-4, dropped the supply ceiling to 3.6V, fixed the address at order time and removed clock stretching. The market demand spike on the 4x generation made this page necessary: substitutions happen constantly and every one of them crosses at least one of those lines.
MountingSurface Mount-
Output12b-
Output TypeI2C-
Response Time8 s-
Role In Circuit-Original Reference Part
Sensor TypeHumidity, Temperature-
Sourcing Status-Active Shenzhen Spot Sourcing (24–48h)

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