M48T37V-10MH1E

Real Time Clock Overview

The M48T37V-10MH1E is a 256 Kbit (32 Kbit x 8) TIMEKEEPER SRAM and real-time clock manufactured by STMicroelectronics. It integrates ultra-low power SRAM, a real-time clock, and power-fail control circuits within a 44-lead SOIC package designed for SNAPHAT battery/crystal housing attachment. Operating at 3.0 V to 3.6 V with a power-fail deselect voltage between 2.7 V and 3.0 V, it features automatic write protection, a watchdog timer, and microprocessor power-on reset functionality.

Real Time Clock Feature Summary

• Integrated 32 Kbit x 8 non-volatile static RAM with real-time clock capabilities
• 44-lead SOIC package compatible with SNAPHAT battery and crystal modules
• Automatic power-fail chip deselect and write protection at 2.7 V ≤ VPFD ≤ 3.0 V
• Includes watchdog timer, programmable alarm output, and battery low flag

Real Time Clock Applications

• Battery-backed memory solutions requiring integrated timekeeping
• Systems needing automatic data protection during power failures
• Embedded applications utilizing surface-mount assembly with post-reflow battery integration

Real Time Clock Procurement Notes

Verify the specific suffix '10MH1E' against official STMicroelectronics documentation to confirm exact speed grade and RoHS compliance status. The base device requires a separate SNAPHAT housing part number, such as M4T32-BR12SH, for complete functionality. Confirm packaging details including tape & reel or tube availability directly from authorized distributors.

Real Time Clock Selection Notes

Select this component when a combined NVRAM and RTC solution is required in a 44-lead form factor. Ensure the system operates within the 3.0 V to 3.6 V supply range. Consider the SNAPHAT mounting process if using surface-mount technology, as the battery module attaches after reflow to prevent thermal damage. Verify that the 2.7 V to 3.0 V power-fail threshold aligns with system voltage requirements.

Real Time Clock Part Context

This part belongs to the M48T37Y/V TIMEKEEPER family of battery-backed SRAMs. It shares functional similarities with the M48T37Y but differs in operating voltage specifications. The series is designed to replace standard SRAMs while providing non-volatility and timekeeping without special write timing constraints.

Real Time Clock Replacement Considerations

The M48T37Y is a pin-compatible alternative operating at 4.5 V to 5.5 V. Direct substitution requires verifying voltage level compatibility and power-fail deselect thresholds. No other direct cross-model substitutes are confirmed in public documentation.