Overview
The M4T28-BR12SH1 is a detachable lithium power source designed by STMicroelectronics for their serial real-time clock and non-volatile TIMEKEEPER surface-mount SOIC packages. This component is part of the SNAPHAT® family, which includes a battery and crystal, and is engineered to be snapped onto the SOIC package after it has been surface-mounted on the PCB. This two-piece solution prevents the battery and crystal from being exposed to the high temperatures associated with the surface-mount process.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Part Number | M4T28-BR12SH1 | |
| Battery Capacity | 48 mAh | mAh |
| Battery Chemistry | Lithium Carbon Monofluoride (Li(CF)) | |
| Nominal Battery Voltage | 2.8 V | V |
| Crystal Frequency | 32.768 kHz | kHz |
| Crystal Load Capacitance | 12.5 pF | pF |
| Crystal Accuracy (at 25°C) | ± 35 ppm | ppm |
| Ambient Operating Temperature | 0 to 70 °C | °C |
| Storage Temperature (VCC off, oscillator off) | –40 to 85 °C | °C |
| Package Type | SNAPHAT® | |
| RoHS Compliance Grade | Ecopack1 |
Key Features
- 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 avoids heat associated with the surface-mount process.
- Snaps directly onto surface-mounted SNAPHAT SOIC.
- Choice of battery capacities: 48 mAh (M4T28-BR12SH) and 120 mAh (M4T32-BR12SH).
- Keyed insertion to ensure proper assembly.
- Removable for replacement and proper disposal.
- Pb-free package.
- Available in Ecopack packages and tubes.
Applications
The M4T28-BR12SH1 is designed for use in various applications requiring reliable battery backup power for real-time clocks and non-volatile memory devices. These include:
- Embedded systems requiring precise timekeeping.
- Industrial control systems.
- Automotive electronics.
- Medical devices.
- Consumer electronics with real-time clock functions.
Q & A
- What is the M4T28-BR12SH1 used for?
The M4T28-BR12SH1 is used to provide battery backup power for serial real-time clocks, non-volatile TIMEKEEPER, and supervisor devices in 28- or 44-pin SNAPHAT SOIC packages.
- What is the battery capacity of the M4T28-BR12SH1?
The battery capacity of the M4T28-BR12SH1 is 48 mAh.
- What type of battery chemistry does the M4T28-BR12SH1 use?
The M4T28-BR12SH1 uses Lithium Carbon Monofluoride (Li(CF)) battery chemistry.
- How is the M4T28-BR12SH1 attached to the SOIC package?
The M4T28-BR12SH1 snaps directly onto the surface-mounted SNAPHAT SOIC package.
- Why is the battery removable?
The battery is removable to avoid heat associated with the surface-mount process and for replacement and proper disposal.
- Is the M4T28-BR12SH1 RoHS compliant?
Yes, the M4T28-BR12SH1 is RoHS compliant and available in Ecopack packages.
- What is the operating temperature range of the M4T28-BR12SH1?
The operating temperature range of the M4T28-BR12SH1 is 0 to 70 °C.
- How do I handle the SNAPHAT top during insertion and removal?
Use a DIP/IC extractor tool to remove the SNAPHAT top, and avoid applying more than 40 pounds of force during insertion to prevent damage.
- What are the environmental considerations for disposing of the M4T28-BR12SH1?
The M4T28-BR12SH1 should be recycled or disposed of according to the battery manufacturer's instructions and local/national disposal and recycling regulations.
- Is the M4T28-BR12SH1 available in different package types?
Yes, the M4T28-BR12SH1 is available in Ecopack packages and tubes.
