M41T83ZQA6F

Real Time Clock Overview

The M41T83ZQA6F is a low-power serial I2C real-time clock (RTC) manufactured by STMicroelectronics. It operates within a supply voltage range of 2.38 V to 5.5 V and supports an industrial temperature range of -40°C to +85°C. The device features an I2C bus interface with a maximum protocol speed of 400 kHz. Key electrical parameters include a typical ultra-low battery supply current of 365 nA and a maximum operating current of 10 µA at 5.5 V. It integrates a 32.768 kHz external crystal-controlled oscillator, automatic power failure switchover, and a watchdog timer.

Real Time Clock Feature Summary

• Ultra-low battery supply current of 365 nA typical
• Factory-calibrated accuracy of ±5 ppm typical after two reflows
• Built-in programmable analog and digital calibration circuits for enhanced precision
• Automatic switchover and reset output circuitry with fixed reference

Real Time Clock Applications

• Smart grid distribution systems
• Smart meters
• Industrial monitoring equipment

Real Time Clock Procurement Notes

Verify the specific suffix 'ZQA6F' against the official STMicroelectronics datasheet to confirm package type (16-VQFN), pinout configuration, and compliance status. Ensure that the ordering suffix does not imply functional differences from the base M41T83Z model unless explicitly documented in the manufacturer's product selection guide or change notices.

Real Time Clock Selection Notes

Select this component when a low-voltage operation down to 2.38 V is required, distinguishing it from higher-voltage variants like the M41T83S (3.0 V min). Consider the 16-VQFN package constraints for PCB layout. Verify if the factory-calibrated ±5 ppm accuracy meets system timing requirements without additional external calibration, as other packages may offer different baseline accuracies.

Real Time Clock Part Context

This part belongs to the M41T83 family of serial I2C real-time clocks. It shares core functionalities such as calendar counters, alarm interrupts, and SRAM with siblings like the M41T83ZMY6F. The primary distinctions lie in the supply voltage minimum (2.38 V for the Z series) and the physical packaging (VQFN16 vs. SOIC/SOX options).

Real Time Clock Replacement Considerations

Direct substitutes within the same family include M41T83ZMY6F, provided the package difference (SOX18 vs. QFN16) is accommodated mechanically. Cross-family replacements require verification of I2C compatibility and voltage levels.