MAX31855RASA+

Sensor And Detector Interfaces Overview

The MAX31855RASA+ is a cold-junction compensated thermocouple-to-digital converter optimized for R-type sensors. It digitizes signals from K, J, N, T, S, R, or E-type thermocouples using an internal 14-bit ADC with 0.25°C resolution. The device operates on a 3.0V to 3.6V supply and features an SPI-compatible interface. It provides ±2°C accuracy for R-type inputs between -50°C and +700°C, extending to ±6°C across the full range of -50°C to +1768°C. Operating temperature spans -40°C to +125°C in an 8-SOIC package.

Sensor And Detector Interfaces Feature Summary

• Integrated cold-junction compensation eliminates external reference sensor requirements
• Built-in fault detection identifies open circuits and shorts to VCC or GND
• SPI-compatible read-only serial interface simplifies microcontroller integration

Sensor And Detector Interfaces Applications

• Industrial process control systems
• HVAC monitoring equipment
• Appliance temperature sensing

Sensor And Detector Interfaces Procurement Notes

Verify the specific suffix against official documentation to confirm the R-type thermocouple optimization. Confirm RoHS compliance status and lead-free packaging details directly with the manufacturer or authorized distributors before procurement.

Sensor And Detector Interfaces Selection Notes

Select this variant specifically for R-type platinum/rhodium thermocouple applications requiring high-temperature stability. Ensure the system voltage remains within the 3.0V to 3.6V operational range and that the PCB layout accommodates the 8-SOIC footprint.

Sensor And Detector Interfaces Part Context

This component belongs to the MAX31855 family of thermocouple signal conditioners. Variants are distinguished by suffixes indicating the supported thermocouple type (e.g., K, J, R) and packaging format. The RASA+ designation specifies the R-type calibration and SOIC package configuration.

Sensor And Detector Interfaces Replacement Considerations

Direct functional substitutes include other MAX31855 variants such as MAX31855KASA+ or MAX31855JASA+. Verify thermocouple type compatibility when substituting, as internal calibration tables differ significantly between types.