Specifications
MAX6675ISA is a cold-junction compensated K-type thermocouple-to-digital converter IC originally from Maxim Integrated (now Analog Devices). It integrates signal conditioning, cold junction compensation, 12-bit ADC and SPI serial interface, dedicated for high-temperature industrial temperature acquisition with K thermocouplesAnalog Devices.
👉 It differs from MAX6674 (T-type thermocouple) and MAX31855 with wider temperature range. This model only supports K-type probes, compact SOIC8 packaging, simple read-only SPI without complex configuration, ideal for low-cost furnace, oven and industrial heat monitoring circuits.
Key Features
- Thermocouple Measurement Core
- Only compatible with Type-K thermocouple; measuring range: 0°C ~ +1024°C
- Built-in cold-junction compensation circuit, eliminates extra ambient temperature sensor
- 12-bit ADC resolution, temperature step accuracy 0.25°C per LSB
- Measurement accuracy: ±8 LSB (±2°C) within 0~700°C working range
- Built-in open-circuit detection flag to alert MCU when thermocouple wire breaks
- SPI Serial Communication
- Standard 3-wire SPI read-only interface (CS#, SCK, SO), no write register operation
- Data frame outputs temperature value + fault status bit in one 16-bit transmission
- Compatible with all 3.3V/5V general MCUs (STM32, GD32, Arduino, ESP32)
- Simple timing logic, no complex calibration or initialization required
- Electrical Operating Specifications
- Supply voltage range: 3.0V ~ 5.5V, compatible with single lithium or 5V system rail
- Typical operating supply current: 0.7mA; max 1.5mA
- No shutdown mode, continuous temperature sampling once powered on
- Input differential circuit suppresses industrial EMC noise from thermocouple long wiring
- Package & Environmental Ratings
- Package: 8-pin narrow SOIC (3.9mm width, SOIC-8) surface mount
- Operating temperature grade: Commercial -20°C ~ +85°C
- Suffix ISA = tube packaging for small-batch production; MAX6675ISA+T is tape-and-reel lead-free version
- MSL 1 moisture sensitivity level, unlimited floor life without dry bag storage
Typical Applications
Industrial furnace, kiln, high-temperature oven temperature monitoring
3D printer hot end heating temperature closed-loop control
Reflow soldering oven and wave soldering equipment thermal detection
Industrial boiler, pipeline high-temperature sampling modules
HVAC industrial heat treatment equipment temperature acquisition
Household high-power oven, commercial barbecue temperature controllers
Laboratory high-temperature test bench data loggers
New energy battery thermal cycling aging test equipment
CNC machine tool spindle / cutting fluid temperature monitoring
Makers & embedded development board high-temperature sensor expansion
LXB Semicon supplies original Analog Devices MAX6675ISA K-type thermocouple digital converter IC
