{"title":"Adafruit Sensirion SHT45 Precision Temp & Humidity with PTFE","handle":"adafruit-sensirion-sht45-precision-temp-humidity-with-ptfe-ada6174","url":"/products/adafruit-sensirion-sht45-precision-temp-humidity-with-ptfe-ada6174","description":"The Adafruit Sensirion SHT45 is the highest-accuracy sensor in the SHT4x family, delivering ±1.0% typical relative humidity accuracy and ±0.1 °C typical temperature accuracy. Featuring a PTFE membrane for protection against dust and water ingress, it's built for demanding environments and precision applications.\n\nThe breakout includes a voltage regulator and level shifting, making it compatible with both 3.3 V and 5 V systems. STEMMA QT / Qwiic connectors allow solderless hookup, and Arduino and CircuitPython libraries are available for quick integration.\n\nKey Features\n\n\nRelative Humidity Accuracy – ±1.0% RH typical (25–75% RH) — best in the SHT4x family\n\nTemperature Accuracy – ±0.1 °C typical (0–75 °C) — best in the SHT4x family\n\nPTFE Membrane – Protects the sensor against dust and water while allowing accurate humidity measurement\n\nTrue I2C Interface – Address 0x44, fast mode plus with CRC checksum\n\nUltra-Low Power – Ideal for battery-powered applications\n\nVariable Power Heater – Built-in heater for defogging and self-testing\n\n3.3 V / 5 V Compatible – Onboard voltage regulator and level shifting\n\nSTEMMA QT / Qwiic Connectors – Solderless I2C connection and daisy-chaining\n\n\nAlso Consider\n\n\nSHT41 Sensor – Mid-range option with ±1.8% RH typical accuracy at lower cost\n\nSHT40 Sensor – Budget-friendly option with similar typical accuracy at 25–75% RH\n\n\nIdeal For\n\nPrecision environmental monitoring and calibration\nScientific research and laboratory instruments\nHVAC and climate control systems requiring high accuracy\nOutdoor and industrial applications (PTFE protected)\n\n\nPackage Contents\n\n1× Adafruit Sensirion SHT45 Precision Temperature & Humidity Sensor Breakout with PTFE\n1× Header strip (soldering required for breadboard use)\n\n\n\nNote: STEMMA QT / Qwiic cable is not included. Use a compatible JST SH cable for solderless connection, or solder directly to the header pads.\n\n\nResources\n\nAdafruit SHT4x Guide (Arduino & CircuitPython)\n","vendor":"Adafruit","product_type":"physical","in_stock":false,"options":[],"variants":[{"id":656,"title":"Default Title","sku":"AF-6174","mpn":"ADA6174","price":26.51,"compare_at_price":0.0,"on_sale":false,"in_stock":false,"available_quantity":0,"option1":"Default Title"}]}