Alternative Parts

  • AD8479

    2x wider Common-mode range, higher input impedance, lower voltage drift and gain error, with R-R Output


Features and Benefits

  • Improved replacement for: INA117P and INA117KU
  • ±270 V common-mode voltage range
  • Input protection to
    ±500 V common mode
    ±500 V differential mode
    Wide power supply range (±2.5 V to ±18 V)
    ±10 V output swing on ±12 V supply
    1 mA maximum power supply current
    3 ppm maximum gain nonlinearity (AD629B)
    20 μV/°C maximum offset drift (AD629A)
    10 μV/°C maximum offset drift (AD629B)
    10 ppm/°C maximum gain drift
    77 dB minimum CMRR @ 500 Hz (AD629A)
    86 dB minimum CMRR @ 500 Hz (AD629B)
    500 kHz bandwidth

Product Details

The AD629 is a difference amplifier with a very high input, common-mode voltage range. It is a precision device that allows the user to accurately measure differential signals in the presence of high common-mode voltages up to ±270 V. 

The AD629 can replace costly isolation amplifiers in applications that do not require galvanic isolation. The device operates over a ±270 V common-mode voltage range and has inputs that are protected from common-mode or differential mode transients up to ±500 V.

The AD629 has low offset, low offset drift, low gain error drift, low common-mode rejection drift, and excellent CMRR over a wide frequency range.

The AD629 is available in low cost, 8-lead PDIP and 8-lead SOIC packages. For all packages (including die) and grades, performance is guaranteed over the industrial temperature range of −40°C to +85°C.


  • High voltage current sensing
  • Battery cell voltage monitors
  • Power supply current monitors
  • Motor controls
  • Isolation

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Tools & Simulations

Design Tools

ADIsimPE Linear and Mixed-Signal Circuit Simulator – Personal Edition

ADIsimPE, which is powered by SIMetrix/SIMPLIS, is a circuit simulation suite optimized for the design and development of analog and mixed signal circuits. SIMetrix mode is ideal for the simulation of general non-switching circuits. It provides full Pspice compatibility for use with industry-standard SPICE models. SIMPLIS (SIMulation Piecewise-Linear System) mode simulates the operation of switching circuits with vastly improved robustness, speed, and accuracy compared to standard SPICE. It is particularly useful for switching power supply, PLLs, and ADC/DAC applications.

Reference Designs (1)

Design Resources

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.

PCN-PDN Information


AD629 Discussions

AD629 Didn't find what you were looking for? Ask the Analog community »

Sample & Buy

Sample & Buy functionality exists in desktop site
Check Inventory

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