AD8495ARMZ

Overview

The AD8495ARMZ is a precision instrumentation amplifier with integrated cold junction compensation, optimized for K-type thermocouples. It provides a linear output of 5 mV/°C directly from the thermocouple signal. The device operates on a single supply ranging from 2.7 V to 36 V or dual supplies of ±2.7 V to ±18 V. Key electrical specifications include an initial accuracy of ±1°C at 25°C and ambient temperature rejection of 0.025°C/°C. The quiescent current is typically 180 μA, resulting in power consumption under 1 mW at 5 V. The -3 dB bandwidth is 25 kHz, and it features high impedance differential inputs with overvoltage protection up to VS ± 25 V.

Feature Summary

• Integrated cold junction compensation eliminates external reference sensor requirements.
• Laser-wafer trimmed for precise matching to K-type thermocouple characteristics.
• High impedance differential inputs reject common-mode noise on long leads.
• Robust input protection withstands 4 kV ESD and overvoltages up to VS ± 25 V.

Applications

• J or K type thermocouple temperature measurement
• Setpoint controller applications
• White goods (oven, stovetop) temperature measurements
• Exhaust gas temperature sensing

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct packaging and tape-and-reel specifications. Confirm that the component meets RoHS compliance requirements for the intended manufacturing process. Cross-reference the part number with authorized distributors to validate authenticity and traceability before procurement.

Selection Notes

Select the AD8495ARMZ when using K-type thermocouples requiring a linear Celsius output. Ensure the ambient temperature range falls within 0°C to 50°C for optimal performance. Verify that the supply voltage accommodates the required output swing and that the load current does not exceed the short-circuit limit. Consider the MSOP-8 package size for space-constrained designs.

Part Context

This component belongs to the AD849x family of precision thermocouple amplifiers. The AD8495 variant is specifically calibrated for K-type sensors, whereas the AD8494 supports J-type. Other family members like the AD8496 and AD8497 are optimized for higher ambient temperatures. All variants share similar architectures but differ in gain and calibration ranges.

Replacement Considerations

Public confirmed substitute part numbers: AD8495ARZ, AD8495ARMZ-R7.