{"title":"Thermocouple Amplifier MAX31855 breakout board (MAX6675 upgrade)","handle":"thermocouple-amplifier-max31855-breakout-board-max6675-upgrade","url":"/products/thermocouple-amplifier-max31855-breakout-board-max6675-upgrade","description":"The MAX31855 Thermocouple Amplifier Breakout converts K-type thermocouple readings into digital data via SPI, handling cold-junction compensation automatically. It measures temperatures from −200°C to +1350°C in 0.25°C increments, making it suitable for a wide range of temperature monitoring applications.\n\nThe breakout includes the MAX31855K chip, a 3.3 V regulator with 10 µF bypass capacitors, and level-shifting circuitry for 3.3–5 V compatibility. It comes with a 2-pin terminal block for the thermocouple connection and a pin header for breadboard use.\n\nKey Features\n\n\nK-Type Thermocouple Interface – Digital SPI output with cold-junction compensation\n\nWide Temperature Range – −200°C to +1350°C in 0.25°C increments\n\n3.3–5 V Compatible – On-board regulator and level shifting for flexible logic levels\n\nSPI Interface – Requires only 3 digital I/O pins\n\nInternal Temperature Sensor – Built-in cold-junction temperature reading\n\nFully Assembled – Tested and ready to use with included terminal block and header\n\n\nSpecifications\n\n\nIC – MAX31855K (replaces discontinued MAX6675)\n\nThermocouple Type – K-type only\n\nTemperature Range – −200°C to +1350°C\n\nResolution – 0.25°C\n\nAccuracy – ±2°C to ±6°C (typical for K-type thermocouples)\n\nInterface – SPI (3 digital pins)\n\nSupply Voltage – 3.3–5 V\n\n\nIdeal For\n\nHigh-temperature monitoring (ovens, kilns, furnaces)\nIndustrial process temperature measurement\n3D printer hotend monitoring\nArduino and microcontroller temperature logging\n\n\nPackage Contents\n\n1× MAX31855 Thermocouple Amplifier Breakout (assembled and tested)\n1× 2-pin terminal block\n1× Pin header\n\n\n\nNote: The MAX31855 is not pin-compatible or code-compatible with the older MAX6675. Existing MAX6675 designs will require adjustment. A K-type thermocouple is required and sold separately.\n\n\nResources\n\nThermocouple Tutorial (with CircuitPython and Arduino libraries)\n","vendor":"Adafruit","product_type":"physical","in_stock":false,"options":[],"variants":[{"id":14006,"title":"Default Title","sku":"AF-269","price":29.55,"on_sale":false,"in_stock":false,"available_quantity":0,"option1":"Default Title"}]}