1. Products
  2. Sensors and MEMS
  3. Electrochemical Sensors
  4. MAX35103


Features and Benefits

  • High Accuracy Flow Measurement for Billing and Leak Detection
    • Time-to-Digital Accuracy Down to 20ps
    • Measurement Range Up to 8ms
    • Two Channels: Single-Stop Channel
  • High Accuracy Temperature Measurement for Precise Heat and Flow Calculations
    • Up to Four 2-Wire Sensors
    • PT1000 and PT500 RTD Support
  • Maximizes Battery Life with Low Device and Overall System Power
    • Ultra-Low 5μA ToF Measurement and < 125nA Duty-Cycled Temperature Measurement
    • Event Timing Mode Reduces Host Microcontroller Overhead to Minimize System Power Consumption
    • 2.3V to 3.6V Single-Supply Operation
  • High-Integration Solution Minimizes Parts Count and Reduces BOM Cost
    • 8KB of Nonvolatile Flash Memory for Data Logging
    • Built-in Real Time Clock
    • Small, 5mm x 5mm, 32-Pin TQFP Package
    • -40°C to +85°C Operation

Product Details

The MAX35103 is a time-to-digital converter with built-in amplifier and comparator targeted as a low-cost analog front-end solution for the ultrasonic heat meter and flow meter markets. It is similar to the MAX35101, but consumes about half the average power and increases the maximum ToF measurement frequency in event timing mode from 2Hz to 16Hz.

With a time measurement accuracy of 20ps and automatic differential time-of-flight (ToF) measurement, this device makes for simplified computation of liquid flow.

Average power consumption is the lowest available with ultra-low 5.5μA ToF measurement and < 125nA duty-cycled temperature measurement.


  • Ultrasonic Gas Meters
  • Ultrasonic Heat Meters
  • Ultrasonic Water Meters

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.

Evaluation Kits (2)

Product Recommendations

MAX35103 Companion Parts

Recommended Related Parts

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.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
MAX35103EHJ+ Material Declaration Reliability Data 32-TQFP_EP-5X5X1.0
MAX35103EHJ+T Material Declaration Reliability Data 32-TQFP_EP-5X5X1.0
Wafer Fabrication Data MAX35103 Reliability Data

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Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

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.