Thermocouples are very sensitive, requiring a good amplifier with a cold-compensation reference. We have a couple digital thermocouple amplifiers in the shop already from Maxim. Now we’re happy to introduce an excellent analog-output amplifier. This is a very simple sensor to use, and if your microcontroller has analog input capability, you’ll be ready to go really fast!

The AD8495 K-type thermocouple amplifier from Analog Devices is so easy to use, we documented the whole thing on the back of the tiny PCB. Power the board with 3-18VDC and measure the output voltage on theOUTpin. You can easily convert the voltage to temperature with the following equation: Temperature = (Vout – 1.25) / 0.005 V. So for example, if the voltage is 1.5VDC, the temperature is (1.5 – 1.25) / 0.005 = 50C

Each order comes with a 2 pin terminal block (for connecting to the thermocouple), a fully assembled PCB with the AD8495 + TLVH431 1.25V precision voltage reference, and pin header (to plug into any breadboard or perfboard).Not for use with any other kind of thermocouple, K type only!

• Works with any K type thermocouple
• Uses the AD8495ARMZ part number (A graded chip)
• Will not work with any other kind of thermocouple other than K type
• Easy to use analog output
• Temp range with 5V power:-250C to +750C output(0 to 5VDC) as long as the thermocouple can handle that range
• Temp range with 3.3V power:-250C to +410C output(0 to 3.3VDC) as long as the thermocouple can handle that range

Note:The terminal blocks included with your product may be blue or black.

Technical Details

• Sensing Accuracy Range: 1C around room temperature, 2C for 25C to +400C,beyond that range see the AN-1087 app note
• Supply Voltage: 3-18VDC
• AD8495 Datasheet
• EagleCAD PCB files on GitHub
• Fritzing object in Adafruit Fritzing Library

Revision History:

• As of March 15, 2024-We added a pre-soldered terminal block.
• As of May 15, 2023we’ve updated this PCB withAdafruit Pinguinto make a lovely and legible silkscreen – you may get the new PCB or the older version with vector fonts – both are identical other than the fancy silkscreen.