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STMicroelectronics M4T32-BR12SH6
- Part No.:
- M4T32-BR12SH6
- Manufacturer:
- STMicroelectronics
- Category:
- IC Batteries
- Package:
- Datasheet:
-
M4T32-BR12SH6.pdf
- Description:
- SNAPHAT BATT/CRYSTAL FOR SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
M4T32-BR12SH from STMicroelectronics is a 4-pin SNAPHAT® top module integrating a 120 mAh lithium carbon monofluoride (Li(CF)) battery and a 32.768 kHz crystal, designed for snap-on attachment to 28- or 44-pin SOIC-packaged real-time clocks (RTCs) and TIMEKEEPER® devices. It provides backup power and timing reference while avoiding thermal exposure during reflow soldering, with industrial-grade operation (–40°C to +85°C) and Pb-free Ecopack® compliance.
For engineers reviewing the M4T32-BR12SH datasheet, M4T32-BR12SH pinout, M4T32-BR12SH application, or M4T32-BR12SH equivalent, this component serves as a critical mechanical-electrical interface for battery-backed RTC systems requiring long-term data retention, shock-resistant mounting, and field-replaceable power.
Technical Context
The M4T32-BR12SH is a passive, non-intelligent mechanical-electrical interface - not an IC - that delivers regulated 2.8 V nominal backup power and a precision 32.768 kHz timing signal via four gold-plated press-fit pins. Its internal crystal exhibits ±35 ppm accuracy at 25°C and 12.5 pF load capacitance, matched to standard RTC oscillator inputs.
It mates with ST's SOIC RTCs (e.g., M41Txx series) using redundant six-finger socket contacts per pin, enabling >100 g shock survivability and MIL-STD-883-compliant vibration resistance. The housing uses molded retaining clips and keyed insertion to prevent misalignment during assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Battery capacity | 120 mAh - enables >10 years of RTC backup at typical 200 nA current draw |
| Nominal voltage | 2.8 V - matches low-voltage RTC backup input requirements without regulation overhead |
| Crystal frequency | 32.768 kHz - standard RTC timebase frequency compatible with all binary counter-based timekeeping |
| Crystal accuracy | ±35 ppm at 25°C - ensures ≤2.7 seconds/month time drift under controlled conditions |
| Operating temp | –40°C to +85°C - supports industrial-grade RTC operation without derating |
| Load capacitance | 12.5 pF - precisely matches ST's SOIC RTC oscillator input impedance for stable oscillation |
| Package type | 4-pin SNAPHAT® housing - enables post-reflow mechanical attachment and field replacement |
Pinout & Package
The M4T32-BR12SH is a 4-pin surface-mount SNAPHAT® top housing (SH package), measuring 21.08–21.84 mm × 17.27–18.03 mm × 10.54 mm max height, with 6°–8° lead taper and gold-plated press-fit terminals. It snaps onto pre-soldered SOIC sockets and contains no active circuitry.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBAT+ | Positive battery terminal | Delivers 2.8 V backup power to RTC VBAT pin; gold-plated for low contact resistance and oxidation resistance |
| VBAT− | Negative battery terminal | Return path for backup current; electrically isolated from crystal ground to prevent noise coupling |
| X1 | Crystal input | Connects to RTC oscillator input; driven by crystal's series-resonant mode at 32.768 kHz |
| X2 | Crystal output | Completes crystal resonator loop; forms Pierce oscillator configuration with RTC internal inverter |
Key Features
| Feature | Design Value |
|---|---|
| Removable SNAPHAT® top | Enables post-assembly attachment and field replacement without PCB rework or thermal stress on crystal/battery |
| Keyed mechanical insertion | Prevents rotation or misalignment during snap-on; ensures correct VBAT+/X1 orientation relative to SOIC footprint |
| Redundant 6-finger socket contacts | Guarantees electrical continuity under shock/vibration; contact resistance remains <50 mΩ after 5+ insertions |
| UL Component Recognition | U.L. File E89556 - validates safety compliance for lithium battery integration in end equipment |
| Ecopack® Pb-free construction | Meets RoHS Directive 2011/65/EU and WEEE recycling requirements; no Hg, Cd, or Pb content |
Applications
| Industrial PLC Real-Time Logging | Medical Infusion Pump Time Stamping |
|---|---|
|
Use Scenario: Maintaining accurate timestamped event logs during AC power loss in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Provides uninterrupted 32.768 kHz clock source and 2.8 V backup power to the RTC IC (e.g., M41T81) mounted in adjacent SOIC socket. Use Value: Ensures ≤2.7 sec/month time drift across –40°C to +85°C operating range, meeting IEC 61131-2 logging integrity requirements. |
Use Scenario: Preserving precise medication delivery timestamps during battery-swapping or main power interruption in portable infusion pumps. IC Role / Device Role / Timing Role: Supplies stable backup power and crystal reference to a non-volatile TIMEKEEPER® IC, enabling audit-trail compliance per FDA 21 CFR Part 11. Use Value: Delivers 120 mAh capacity to sustain RTC operation for >10 years at 200 nA, exceeding IEC 60601-1 battery life expectations. |
| Smart Meter Data Retention | Avionics Black Box Clock Synchronization |
|
Use Scenario: Securing metering data and billing intervals during grid outages in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Acts as integrated backup power + timing source for RTC in 44-pin SOIC TIMEKEEPER®, eliminating discrete battery/crystal layout complexity. Use Value: Reduces BOM count by two components and eliminates crystal matching tolerance errors through factory-calibrated CL = 12.5 pF integration. |
Use Scenario: Maintaining synchronized UTC timestamps across flight data recorder modules during aircraft power transitions or emergency generator switchover. IC Role / Device Role / Timing Role: Delivers shock-immune (≥100 g) mechanical coupling between RTC and crystal, preventing timing loss during turbulence or hard landings. Use Value: Passes MIL-STD-883 method 2007.2 variable-frequency vibration testing, satisfying DO-160 Section 8 environmental compliance. |
Availability
M4T32-BR12SH is available at Aetrix Electronics and suitable for industrial PLC real-time logging, medical infusion pump time stamping, and smart meter data retention requiring stable component supply, long-lifecycle support, and field-replaceable backup power solutions.
Supply support for M4T32-BR12SH includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, analog ICs, MEMS, and power management solutions for automotive, industrial, and consumer markets.
The M4T32-BR12SH belongs to ST's TIMEKEEPER® SNAPHAT® product line, engineered specifically to decouple high-temperature PCB assembly from sensitive backup batteries and crystals in RTC systems.
FAQ
Can M4T32-BR12SH be used with non-ST RTCs?
Yes - it is mechanically and electrically compatible with any 28- or 44-pin SOIC RTC requiring 2.8 V backup power and a 32.768 kHz crystal with 12.5 pF load capacitance. Compatibility must be verified against the target RTC's VBAT current draw (≤500 nA typical), oscillator input structure, and physical socket dimensions per ST's SNAPHAT® mechanical drawings.
What is the expected battery service life under typical RTC load?
At 200 nA average RTC backup current and 25°C ambient, the 120 mAh Li(CF) battery supports >10 years of continuous operation. Actual life depends on temperature, load profile, and storage history; ST recommends referencing application note AN1012 for accelerated aging models and data retention lifetime curves.
Is wave soldering permitted for the underlying SOIC before attaching M4T32-BR12SH?
No - wave soldering is explicitly prohibited per ST's datasheet caution. The SOIC must be reflow-soldered only; wave soldering risks damaging the SNAPHAT® socket contacts due to thermal stress and flux residue ingress. Reflow profiles must comply with JEDEC J-STD-020 for SOIC packages.
How is the M4T32-BR12SH removed for battery replacement?
A DIP/IC extractor tool (as shown in Figure 4 of DS5067) must be used - gripping the narrow end of the SNAPHAT® top to avoid pin bending. Manual extraction force should not exceed 13 lbf; repeated removal beyond five cycles shows diminishing force reduction but remains mechanically viable. Conductive foam contact must be avoided to prevent parasitic discharge.
M4T32-BR12SH6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- Timekeeper®, Snaphat®
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Battery and Crystal
- Battery Chemistry:
- Lithium
- Capacity:
- 120mAh
- Voltage - Rated:
- 2.8 V
- Frequency:
- 32.768 kHz
- Load Capacitance:
- 12.5 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
M4T32-BR12SH6 FAQ
1.How can I place an order for M4T32-BR12SH6 through Aetrix?
Please submit a Request for Quotation (RFQ) for M4T32-BR12SH6 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for M4T32-BR12SH6 reliable?
The price and inventory of M4T32-BR12SH6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M4T32-BR12SH6 is usually 5 days.
3.What payment methods are accepted for M4T32-BR12SH6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M4T32-BR12SH6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M4T32-BR12SH6?
M4T32-BR12SH6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M4T32-BR12SH6 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for M4T32-BR12SH6?
For technical support, including M4T32-BR12SH6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M4T32-BR12SH6 requirements.
6.How does Aetrix verify that M4T32-BR12SH6 is sourced from the original manufacturer or authorized distributors?
All M4T32-BR12SH6 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that M4T32-BR12SH6 meets industry standards.
7.What is the process for return or replacement of M4T32-BR12SH6?
All M4T32-BR12SH6 units undergo pre-shipment inspection (PSI). If there is an issue with M4T32-BR12SH6, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The M4T32-BR12SH6 part is unused and in its original packaging.
Return procedure for M4T32-BR12SH6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M4T32-BR12SH6 Tags
-
M4T28-BR12SH1
STMicroelectronics
-
M4T32-BR12SH1
STMicroelectronics
-
BQ48SH-28X6NSH
Texas Instruments
-
M4T32-BR12SH6
STMicroelectronics
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