Cold-junction compensated thermocouple digitizer in an 8-SOIC
The Analog Devices MAX31855KASA+ is a thermocouple-to-digital converter that directly digitizes the signal from a thermocouple, performing cold-junction compensation and linearization internally. It accepts multiple thermocouple types, outputs the temperature reading in digital format, and draws 900 µA from the supply. The device operates across the full -40°C to 125°C temperature range, making it suitable for industrial process control, engine monitoring, and HVAC equipment where the converter sits on the same board as the hot junction.
Supply current and temperature range — what they mean for the BOM
The 900 µA supply current is the total device draw including the internal cold-junction compensation and conversion logic.
Package and mounting — footprint and handling
Housed in an 8-SOIC package with a 0.154-inch body width (3.90 mm), the MAX31855KASA+ is a surface-mount device. The SOIC-8 footprint is a standard, low-cost layout that routes easily on two-layer boards.
Lifecycle and compliance — active production, no end-of-life watch
The MAX31855KASA+ carries an Active product status with ROHS3 compliance. For BOM planning, the active status means no forced redesign from obsolescence in the near term, and the ROHS3 declaration covers EU and global regulatory requirements without an exemption expiry date.