±0.25°C Accurate, 16-Bit Digital I2C Temperature Sensor

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Product Details

The ADT7420 is a high accuracy digital temperature sensor offering breakthrough performance over a wide industrial range, housed in a 4 mm × 4 mm LFCSP package. It contains an internal band gap reference, a temperature sensor, and a 16-bit ADC to monitor and digitize the temperature to 0.0078°C resolution. The ADC resolution, by default, is set to 13 bits (0.0625°C). The ADC resolution is a user programmable mode that can be changed through the serial interface.

The ADT7420 is guaranteed to operate over supply voltages from 2.7 V to 5.5 V. Operating at 3.3 V, the average supply current is typi-cally 210 μA. The ADT7420 has a shutdown mode that powers down the device and offers a shutdown current of typically 2.0 μA at 3.3 V. The ADT7420 is rated for operation over the −40°C to +150°C temperature range.

Pin A0 and Pin A1 are available for address selection, giving the ADT7420 four possible I2C addresses. The CT pin is an open-drain output that becomes active when the temperature exceeds a programmable critical temperature limit. The INT pin is also an open-drain output that becomes active when the tempera-ture exceeds a programmable limit. The INT pin and CT pin can operate in comparator and interrupt event modes.

Product Highlights
  1. Ease of use, no calibration or correction required by the user.
  2. Low power consumption.
  3. Excellent long-term stability and reliability.
  4. High accuracy for industrial, instrumentation, and medical applications.
  5. Packaged in a 16-lead, 4 mm × 4 mm LFCSP RoHS-compliant package.

      • RTD and thermistor replacement
      • Cold junction compensation
      • Medical equipment
      • Industrial control and test
      • Food transportation and storage
      • Environmental monitoring and HVAC
      • Laser diode temperature control

Product Lifecycle

checked Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits


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EVAL-ADT7420 Circuit Diagram

Product Details

The ADT7X20 evaluation board allows designers to easily evaluate all features of the ADT7420 and ADT7320 high accuracy temperature sensor. There are two boards - the main evaluation board and the secondary evaluation board. The secondary board can be used to measure temperatures that are remote from the main board.

The ADT7320FBZ and ADT7420FBZ are flex boards that can be attached to the evaluation board via the breakout port or used as a standalone slave device. Both of the boards are optional extras to the standard evaluation kit.

Please note: This Evaluation software does not run on Windows 8 or Windows 10 (USB driver is non-compliant with OS >Windows 7).


EVAL-ADT7420-PMDZ Circuit Diagram

Product Details

The PMOD compatible evaluation/prototyping board is a small form factor, low cost ambient temperature sensor measurement board. When prototyping, this board is used in conjunction with the ADICUP360 or the ADICUP3029 development platform. Direct electrical and physical connection will enable you to get started quickly with hardware and software, to help develop your solution.

I2C PMOD peripheral connectors can also be found on many 3rd party MCU or FPGA development boards, where the EVAL-ADT7420-PMDZ can be connected directly into those systems, and you can develop your own code using our reference code below.

Tools & Simulations

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Design Resources

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

ADT7420 Material Declaration
PCN-PDN Information Quality And Reliability Symbols and Footprints



Sample & Buy

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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

Price Table Help

Evaluation Boards Pricing displayed is based on 1-piece.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.