{"title":"Adafruit Sensirion SHT45 Precision Temperature & Humidity Sensor","handle":"adafruit-sensirion-sht45-precision-temperature-humidity-sensor","url":"/products/adafruit-sensirion-sht45-precision-temperature-humidity-sensor","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. This version does not include a PTFE membrane, making it suitable for clean indoor environments where dust and water protection is not required.\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\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\nSHT45 with PTFE Membrane – Same precision sensor with dust and water protection for harsher environments\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\nIndoor data logging and weather stations\n\n\nPackage Contents\n\n1× Adafruit Sensirion SHT45 Precision Temperature & Humidity Sensor Breakout\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":true,"options":[],"variants":[{"id":1791,"title":"Default Title","sku":"AF-5665","price":26.19,"compare_at_price":0.0,"on_sale":false,"in_stock":true,"available_quantity":13,"option1":"Default Title"}]}