Low-Current, Real-Time Clock with I2C Interface

World's smallest RTC in WLP

Please check latest availability status for a specific part variant.


The MAX31342 low-current, real-time clock (RTC) is a time-keeping device that provides an extremely low time-keeping current, permitting longer life from a power supply. The MAX31342 supports 6pF high-ESR crystals, which broaden the pool of usable crystals for the devices. This device is accessed through an I2C serial interface. An integrated power-on reset function ensures deterministic default register status upon power-up.

Other features include two time-of-day alarms, interrupt outputs, a programmable square-wave output, and a serial bus timeout mechanism. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in 24-hour mode. The MAX31342 also includes an input for synchronization. When a reference clock (e.g., 32kHz, 50Hz/60Hz Power Line, GPS 1PPS) is present at the CLKIN pin and the enable external clock input bit (ECLK) is set to 1, the MAX31342 RTC is frequency-locked to the external clock and the clock accuracy is determined by the external source.

The device is available in lead(Pb)-free/RoHS-compliant, 8-pin wafer-level package (WLP) 1mm x 2mm package with 0.5mm pitch. The device supports the -40°C to +85°C extended temperature range.

MAX31342: Functional Diagram MAX31342: Functional Diagram Enlarge+

Key Features

  • Increases Battery Life
    • 150nA Timekeeping Current
    • Wide Range of External Crystals with CL = 6pF and ESR up to 100kΩ for Minimal Current Draw
  • Provides Flexible Configurability
    • Programmable Square Wave Output for Clock Monitoring
  • Saves Board Space
    • Integrated Load Capacitors for Crystal Oscillator
    • 1mm x 2mm, 8-Bump WLP with 0.5mm Pitch
  • Value Add Features for Ease of Use
    • +1.6V to +3.6V Operating Voltage Range
    • Countdown Timer with Repeat Function
  • Integrated Protection
    • Power-On Reset for Default Configuration
    • Lockup-Free Operation with Bus Timeout


  • Medical
  • Point-of-Sale (POS)
  • Portable Audio
  • Portable Instruments
  • Power Meters
  • Telematics
  • Wearables
Part NumberInterfaceVSUPPLY
Time Keeping Current
Time of Day AlarmsFunctionsPackage/PinsBudgetary
typSee Notes
MAX31342 I2C
$0.60 @1k
See All Timekeeping & Real-Time Clocks (77)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX31342SHLD: Evaluation Kit for the MAX31342

Technical Documents

Tutorial 6863 The What, Why, When, Where and How of Real-Time Clocks (RTCs)

Quality and Environmental Data

Request Reliability Report for: MAX31342 
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

How to Use the MAX31342SHLD Evaluation Kit

CAD Symbols and Footprints

  • MAX31342EWA+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >


    Related Resources

    Low-Current, Real-Time Clock with I2C Interface and Power Management

    • Increases Battery Life
    • Provides Flexible Configurability
    • Saves Board Space

    Belle Isle 2020
    05/29/2020 - 05/31/2020, Detroit, MI
    2020 Detroit Grand Prix - Chevrolet Detroit Grand Prix presented by Lear Fast Facts The Chevrolet Detroit Grand Prix presented by Lear was hosted on Belle Isle, May 29 - 30 2020. The event featured the cars of the NTT IndyCar Series, the IMSA WeatherTech SportsCar Championship and the Trans Am Series presented by Pirelli. The weekend is collectively referred to as the Chevrolet Detroit Grand Prix presented by Lear and it once again featured the Chevrolet Dual in Detroit IndyCar doubleheader.