M4T32-BR12SH1

Overview

The M4T32-BR12SH1 is a detachable lithium power source designed for ST’s serial real-time clock and non-volatile TIMEKEEPER surface-mount SOIC packages. It features a 120 mAh lithium coin cell battery and a high-precision crystal with a nominal frequency of 32.768 kHz. The component is engineered to snap directly onto surface-mounted SNAPHAT SOIC devices after the soldering process, preventing exposure to high temperatures. This two-piece solution ensures reliable backup power while facilitating easier design implementation and proper disposal.

Feature Summary

• Provides battery backup power for serial real-time clock, non-volatile TIMEKEEPER, and supervisor devices in 28- or 44-pin SNAPHAT SOIC packages
• Removable battery design avoids heat exposure associated with the surface-mount process
• Keyed insertion mechanism ensures correct assembly orientation

Applications

• Electric vehicle charging systems
• Point-of-sale terminals
• Medical and healthcare equipment
• Commercial HVAC systems
• Barcode scanners

Procurement Notes

Verify that the specific part number corresponds to the 120 mAh capacity variant rather than the 48 mAh version. Confirm compatibility with the target 28- or 44-pin SNAPHAT SOIC package. Ensure the procurement channel provides genuine STMicroelectronics components to guarantee performance reliability and longevity specifications.

Selection Notes

Select this component when using ST serial RTCs or TIMEKEEPER SRAM in 28- or 44-pin SOIC packages requiring external backup power. Choose the 120 mAh capacity for applications demanding extended battery life compared to the 48 mAh alternative. The detachable design is essential for protecting the battery and crystal from reflow soldering temperatures during PCB assembly.

Part Context

This component belongs to the M4Txx-BR12SH SNAPHAT series, which serves as a detachable lithium power source for ST’s serial real-time clock and non-volatile memory devices. It is specifically designed to complement the TIMEKEEPER product line, offering a robust solution for maintaining timekeeping and data integrity in surface-mount applications.

Replacement Considerations

The M4T28-BR12SH1 is a compatible substitute within the same family, differing only in battery capacity (48 mAh versus 120 mAh). Both variants share identical physical dimensions, interface compatibility, and functional characteristics suitable for SNAPHAT SOIC packages.