SKU: TH2059
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Adafruit AD8495 Analog Output K-Type Thermocouple Amplifier makes it easy to read high-temperature measurements from a K-type thermocouple using a microcontroller with an analog input. The breakout is built around the AD8495ARMZ thermocouple amplifier and includes a 1.25V precision reference for cold-junction compensation.
Just power the board from 3V to 18V DC, connect your K-type thermocouple to the screw terminal, and measure the voltage on the OUT pin. The output follows a simple conversion formula: Temperature = (Vout - 1.25) / 0.005 V, giving a straightforward analog interface for Arduino, SAMD boards, and other MCUs with ADC inputs.
Important: this breakout works with K-type thermocouples only. It is not compatible with J-type, T-type, or other thermocouple types. For small temperature changes, a higher-resolution ADC is recommended because the output sensitivity is 5 mV/°C.
Technical details for the AD8495 thermocouple amplifier breakout.
| Brand | Adafruit |
|---|---|
| Model | AD8495 Analog Output K-Type Thermocouple Amplifier Breakout |
| Amplifier IC | AD8495ARMZ (A graded chip) |
| Supply Voltage | 3V to 18V DC |
| Output Type | Analog voltage output |
| Transfer Function | 5 mV/°C, Temperature = (Vout - 1.25) / 0.005 V |
| Temperature Range at 5V | -250°C to +750°C output (0 to 5V), subject to thermocouple capability |
| Temperature Range at 3.3V | -250°C to +410°C output (0 to 3.3V), subject to thermocouple capability |
| Reference | TLVH431 1.25V precision voltage reference |
| Thermocouple Compatibility | K-type only |
| Included Hardware | Fully assembled PCB, 2-pin terminal block, pin header |
Note: the included terminal block may be blue or black.
Pin configuration for connecting power, analog output, and the thermocouple.
| Pin | Name | Function |
|---|---|---|
| 1 | V+ | Power input for the breakout; supports 3.3V and 5V operation, and can be powered from 3V to 18V DC |
| 2 | GND | Common ground |
| 3 | OUT | Analog voltage output to a microcontroller ADC pin |
| 4 | RED- | Negative thermocouple connection |
| 5 | YLW+ | Positive thermocouple connection |
A simple hookup looks like this: connect V+ to your board’s 3.3V or 5V rail, GND to ground, and OUT to an analog input such as A0 or A1. Then connect the thermocouple’s red wire to RED- and yellow wire to YLW+.
This breakout is designed for K-type thermocouples only. It will not work with J-type or other thermocouple types.
Connect V+ to your board supply, GND to common ground, and OUT to an analog input pin. The thermocouple connects to the screw terminal with red to RED- and yellow to YLW+.
The breakout can be powered from 3V to 18V DC, and it is commonly used with 3.3V or 5V microcontroller systems. The measurable output range depends on the supply voltage used.
With 5V power, the analog output covers about -250°C to +750°C. With 3.3V power, it covers about -250°C to +410°C, assuming the connected K-type thermocouple itself supports that range.
Use the formula: Temperature = (Vout - 1.25) / 0.005, with Vout in volts and temperature in °C. For example, 1.5V at the OUT pin corresponds to 50°C.
The product includes a fully assembled PCB, a 2-pin terminal block for the thermocouple connection, and pin headers for breadboard or perfboard use. A K-type thermocouple is not included.
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