M4T28-BR12SH1

Overview

The M4T28-BR12SH1 is a detachable lithium power source module designed for STMicroelectronics serial real-time clock and non-volatile TIMEKEEPER surface-mount SOIC packages. It features a 48 mAh lithium coin cell battery and a crystal, housed in a SNAPHAT top assembly. The unit snaps directly onto the surface-mounted SOIC after soldering, preventing exposure to high temperatures during the surface-mount process. It provides battery backup power for compatible devices in 28- or 44-pin SNAPHAT SOIC packages.

Feature Summary

• Provides battery backup power for serial real-time clock and non-volatile TIMEKEEPER devices
• Removable design avoids heat exposure associated with surface-mount processes
• Snaps directly onto surface-mounted SNAPHAT SOIC packages
• Keyed insertion ensures proper assembly orientation

Applications

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

Procurement Notes

Verify compatibility with specific serial RTC or supervisor devices in 28- or 44-pin SNAPHAT SOIC packages before procurement. Confirm that the application requires a detachable battery solution to protect components from surface-mount thermal stress. Ensure the selected base IC supports the SNAPHAT interface standard. Check for availability of replacement batteries if long-term maintenance is required.

Selection Notes

Select this module when a two-piece solution is needed to isolate the battery and crystal from reflow soldering temperatures. Choose based on the requirement for a 48 mAh capacity; the M4T32 variant offers 120 mAh if higher capacity is needed. Ensure the primary device uses a compatible serial interface such as I2C or SPI within the supported package types.

Part Context

This component belongs to the SNAPHAT family of detachable power sources. It is specifically engineered to complement ST's serial real-time clock and non-volatile memory devices. The module allows for flexible design by separating the power source from the main integrated circuit until after the board assembly phase.

Replacement Considerations

M4T32-BR12SH1 offers a 120 mAh capacity instead of 48 mAh.