M41T256YMH7E

Real Time Clock Overview

The M41T256YMH7E is a Real-Time Clock (RTC) IC from STMicroelectronics' Timekeeper series, designed for precise timekeeping and calendar functions. It integrates a 32KB Non-Volatile Static RAM (NVSRAM) accessible via an I2C or 2-wire serial interface. The device operates on a main supply voltage of 4.5V to 5.5V with a maximum current consumption of 2.5mA at 4.5V. For battery-backed operation, it supports a voltage range of 2.5V to 3.5V. The component features leap year compensation and is housed in a 44-BSOP package (44-SOH supplier device package), measuring 8.56mm in width, requiring a SNAPHAT connector.

Real Time Clock Feature Summary

• Integrated 32KB NVSRAM for data storage alongside RTC functionality
• I2C and 2-wire serial interface compatibility
• Automatic leap year compensation up to 2100
• Dual power supply options: 4.5V–5.5V (main) and 2.5V–3.5V (battery)

Real Time Clock Applications

• Industrial systems requiring non-volatile time and data logging
• Embedded devices needing persistent calendar tracking
• Equipment utilizing SNAPHAT connector interfaces

Real Time Clock Procurement Notes

Verify the obsolete status of this component before integration into new designs. Confirm that the 44-BSOP package dimensions and SNAPHAT requirement align with existing PCB layouts. Check RoHS compliance status, as indicated by external sources, against specific project regulatory requirements.

Real Time Clock Selection Notes

Select this part when both real-time clocking and substantial non-volatile memory storage are required in a single package. Ensure the system design accommodates the 4.5V–5.5V operating range for VCC and the 2.5V–3.5V range for the backup battery. Verify that the I2C bus speed and pull-up resistors match the controller's specifications.

Real Time Clock Part Context

This component belongs to the M41T256 family of RTCs with integrated SRAM. It differs from standard EEPROMs by offering immediate read/write access without erase cycles and from basic RTCs by providing significant onboard storage. The YMH7E suffix denotes specific packaging and environmental characteristics within the STMicroelectronics portfolio.

Real Time Clock Replacement Considerations

As the part status is listed as obsolete, direct replacements may be limited. Evaluate other Timekeeper series RTCs with NVSRAM if available. Ensure any substitute matches the 44-pin BSOP footprint and SNAPHAT connector compatibility.