K-type thermocouple front-end with cold-junction compensation on-chip
The MAX6675ISA+T from Maxim Integrated is a complete thermocouple-to-digital converter that accepts a K-type thermocouple input and outputs a digital SPI-compatible signal. It includes cold-junction compensation inside the package, so you don't need an external reference junction or amplifier — just connect the thermocouple wires to the input pins, power it at 1.5 mA, and read temperature data over SPI. The part is housed in an 8-SOIC package and rated for the -20°C to +85°C ambient range, making it suitable for industrial control panels, oven controllers, and HVAC sensor modules where the chip itself stays away from the hot junction.
1.5 mA supply — fits into a microcontroller's 3.3 V rail without a separate regulator
The supply current is 1.5 mA typical. That's low enough to run off a microcontroller's regulated output pin or a small LDO, which simplifies the BOM for isolated or battery-backed designs. No need for a separate power supply branch — just one decoupling cap on the VCC pin.
Active lifecycle — no obsolescence risk for production BOMs
The MAX6675ISA+T has an Active lifecycle status. No last-time-buy or end-of-life notice is on record.