M41T93RQA6F

Real Time Clock Overview

The M41T93RQA6F is a low-power serial SPI bus real-time clock (RTC) manufactured by STMicroelectronics. It features an embedded 32.768 kHz crystal oscillator and operates within a voltage range of 2.0 V to 5.5 V. The device provides non-volatile timekeeping with automatic calendar corrections for leap years and varying month lengths. Key specifications include a typical factory-calibrated accuracy of ±5 ppm after two reflows, ultra-low battery supply current of 365 nA, and integrated power-failure detection with automatic switchover to backup battery supply.

Real Time Clock Feature Summary

• SPI Bus Interface: Serial communication compatible with standard SPI protocols for address and data transfer.
• Embedded Oscillator: Includes an embedded 32.768 kHz crystal, eliminating the need for external components in this package variant.
• Automatic Calendar Logic: Hardware handles corrections for 28, 29 (leap year), 30, and 31-day months automatically.
• Low Power Consumption: Ultra-low battery supply current of 365 nA ensures extended backup operation.

Real Time Clock Applications

• Industrial control systems requiring precise timekeeping.
• Consumer electronics with battery-backed memory requirements.
• Data logging devices needing non-volatile timestamping.
• Telecommunications equipment synchronized via RTC functions.

Real Time Clock Procurement Notes

Verify the specific suffix 'RQA6F' against the official STMicroelectronics datasheet to confirm package type and tape/reel specifications. Ensure compatibility with the target system's SPI voltage levels and pinout configuration before procurement.

Real Time Clock Selection Notes

Select this component when an embedded crystal is required to reduce board space and BOM complexity. The ±5 ppm accuracy is suitable for applications not requiring high-precision external references. Verify that the SPI interface speed matches the host microcontroller's capabilities.

Real Time Clock Part Context

The M41T93 belongs to the M41T series of real-time clocks from STMicroelectronics. This series is designed for low-power applications where non-volatile timekeeping and minimal external component count are critical design constraints.

Real Time Clock Replacement Considerations

Direct replacements may include other M41T93 variants with different suffixes indicating package or reel options. Cross-reference with M41T93Q6F or similar if package differences exist. No alternative part numbers are confirmed as direct substitutes without verifying pin compatibility and electrical parameters.

Real Time Clock FAQ

Does the M41T93RQA6F require an external crystal?

No, this specific package variant includes an embedded 32.768 kHz crystal, reducing the need for external components.

How does the device handle power failures?

It features a built-in power sense circuit that automatically switches to the backup battery supply upon detecting a main power failure.

What is the typical accuracy of the RTC?

The factory-calibrated accuracy is typically ±5 ppm after two reflow soldering cycles.