M48T37V-10MH1F

Real Time Clock Overview

The M48T37V-10MH1F is a 256 Kbit (32 Kbit x 8) non-volatile static RAM and real-time clock IC from the STMicroelectronics Timekeeper series. It operates on a 3.0 V to 3.6 V supply with a maximum current consumption of 2 mA. The device integrates an ultra-low power SRAM, RTC, power-fail control circuit, watchdog timer, and programmable alarm output. It features automatic power-fail chip deselect and write protection, with a power-fail deselect voltage range of 2.7 V to 3.0 V for the V variant. The component is housed in a 44-lead SOIC package designed for direct connection to a SNAPHAT housing containing the battery and crystal.

Real Time Clock Feature Summary

• Integrated 32 Kbit x 8 non-volatile SRAM with real-time clock functionality
• Supports 3.0 V to 3.6 V supply voltage with 2 mA maximum current draw
• Includes power-fail control circuit with automatic chip deselect and write protection
• Features watchdog timer and programmable alarm output active in battery backup mode

Real Time Clock Applications

• Industrial systems requiring precise timekeeping and data retention
• Embedded controllers needing non-volatile memory with integrated clock
• Battery-backed memory solutions where surface-mount assembly precedes battery installation

Real Time Clock Procurement Notes

Verify that the specific suffix MH1F corresponds to the required tape and reel packaging configuration. Confirm compatibility with the designated SNAPHAT housing part numbers, such as M4T28-BR12SH or M4T32-BR12SH, which must be ordered separately. Ensure the design accommodates the 44-lead SOIC footprint and the physical clearance for the top-mounted battery/crystal module.

Real Time Clock Selection Notes

Select this model when a parallel interface is required alongside RTC capabilities. The V suffix indicates operation within the 3.0 V to 3.6 V range; verify against system voltage rails. Consider the 44-lead SOIC package size relative to board space constraints. Ensure the application benefits from the integrated power-fail protection and watchdog timer rather than implementing these functions externally.

Real Time Clock Part Context

This component belongs to the M48T37 TIMEKEEPER family, which provides highly integrated battery-backed memory and real-time clock solutions. The unique design allows the SNAPHAT housing to be mounted after reflow, protecting the battery and crystal from high temperatures during surface-mount processing. This distinguishes it from DIP packages like the M48T02 which house components internally.

Real Time Clock Replacement Considerations

Direct pin-compatible replacements within the same family include the M48T37Y, which operates at 4.5 V to 5.5 V. For lower capacity needs, the M48T35 series offers smaller memory sizes but similar integration. Verify that any substitute maintains the 44-lead SOIC form factor and SNAPHAT compatibility.