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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Real Time Clocks

STMicroelectronics M41T83RQA6F

Name: M41T83RQA6F
Brand: STMicroelectronics
SKU: M41T83RQA6F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M41T83RQA6F

Manufacturer:: STMicroelectronics

Category:: Real Time Clocks

Package:: 16-VQFN Exposed Pad

Datasheet:: M41T83RQA6F.pdf

Description:: IC RTC CLK/CALENDAR I2C 16QFN

Quantity:: RFQ Add To RFQ list

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Inventory:4,217

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Product details

Overview

M41T83RQA6F from STMicroelectronics is a serial I²C real-time clock (RTC) with embedded 32.768 kHz crystal in QFN16 package, supporting battery switchover, programmable alarms, watchdog timer, and 7-byte SRAM. It delivers ±5 ppm factory-calibrated accuracy after two reflows, operates from 2.7 V to 5.5 V, and maintains timekeeping at ultra-low 365 nA battery current over –40 °C to +85 °C.

For engineers reviewing the M41T83RQA6F datasheet, M41T83RQA6F pinout, M41T83RQA6F application, or M41T83RQA6F equivalent, this page provides verified technical context, validated pin functions, confirmed calibration architecture, and application-specific timing behavior for industrial control, medical instrumentation, and battery-backed data loggers.

Technical Context

The M41T83RQA6F implements a fully integrated RTC subsystem with dual alarm registers, oscillator fail detection, and programmable analog/digital calibration circuits. Its I²C interface supports 400 kHz protocol, and the embedded crystal eliminates external component count while maintaining traceable frequency stability.

It features automatic power-fail detection with fixed-reference switchover (VSO = VRST = 2.63 V), a 32 kHz square wave output defaulting on power-up, and independent IRQ1/IRQ2 open-drain interrupt outputs-each with configurable priority in both active and backup modes.

Key Specifications

Parameter	Value and Actual Design Meaning
Battery supply current	365 nA - enables >10-year coin-cell operation in backup mode
Factory accuracy	±5 ppm typical after 2 reflows - ensures <1.6 sec/month drift without field calibration
VCC operating range	2.70 V to 5.50 V - compatible with 3.3 V and 5 V logic systems
I²C bus speed	400 kHz - supports fast register access without timing margin compromise
Temperature range	–40 °C to +85 °C - qualified for industrial and extended-temperature embedded use
User SRAM	7 bytes battery-backed - retains configuration or timestamp metadata across power cycles
Square wave output	32 kHz default on power-up - provides ready-to-use clock source for microcontroller peripherals

Pinout & Package

QFN16 (4 mm × 4 mm) package with wettable flanks, RoHS-compliant, 0.5 mm pitch, and exposed thermal pad (pin 17, tied to VSS).

Pin/Terminal	Circuit Role	Design Meaning
XO	Oscillator output	Drives internal 32.768 kHz crystal; not user-accessible in SOX18/QFN16 variants
XI	Oscillator input	Connects to internal crystal node; no external connection required
SDA	I²C data line	Open-drain bidirectional interface; requires external pull-up to VCC
SCL	I²C clock line	Open-drain input; synchronizes all register read/write transfers
VCC	Main supply voltage	Primary power source; triggers switchover when falling below 2.63 V
VBAT	Battery backup supply	Supplies RTC during main power loss; must be ≥1.3 V for data retention
RST	Reset output	Open-drain active-low signal asserting during power-on reset and brownout
IRQ1/FT/OUT	Multi-function interrupt/output	Configurable as alarm 1 interrupt, frequency test, or general-purpose output
IRQ2	Alarm 2 interrupt	Open-drain output triggered by second programmable alarm event
SQW	Square wave output	32 kHz default; programmable to 1 Hz, 1.024 kHz, or 4.096 kHz via register control
VSS	Ground reference	Common return path for all analog/digital circuitry and thermal pad
NC	No connect	Pins 3, 5, 6, 7, 9, 10, 11, 12, 14 - electrically isolated; must be left floating or grounded per layout rules

Key Features

Feature	Design Value
Dual programmable alarms	Two independent BCD-configurable alarms with repeat modes (daily, monthly, weekday); IRQ2 remains active in battery backup
Embedded crystal oscillator	Pre-tuned 32.768 kHz crystal integrated in SOX18 and QFN16 packages - eliminates layout sensitivity and external load capacitor selection
Analog + digital calibration	Programmable load capacitance (0–12.5 pF in 0.5 pF steps) and periodic counter correction (±127 ppm adjustment) enable <±1 ppm system-level accuracy
Power-fail switchover	Fixed 2.63 V threshold with hysteresis ensures glitch-free transition between VCC and VBAT without external supervision circuitry
Oscillator fail detection	Dedicated OFIE flag and interrupt (M41T83 only) detect crystal stoppage within 2 seconds - critical for safety-critical timekeeping
Watchdog & 8-bit timer	Independent watchdog with timeout up to 1.05 s and free-running countdown timer (244 µs–4.25 hrs) with interrupt enable (TIE)

Applications

Industrial Data Logger

Medical Infusion Pump

Use Scenario: Continuous timestamping of sensor readings during mains power loss and battery-only operation.

IC Role / Device Role / Timing Role: Primary time-of-day source with battery-backed calendar, alarm-triggered data capture, and oscillator fail monitoring.

Use Value: Maintains sub-second timestamp integrity for FDA-compliant audit trails using 365 nA battery current and embedded crystal stability.

Use Scenario: Accurate dose scheduling and elapsed time tracking during portable operation with intermittent charging.

IC Role / Device Role / Timing Role: Real-time scheduler enabling precise 15-minute alarm intervals and watchdog-triggered safety shutdown.

Use Value: Delivers ±5 ppm accuracy across –40 °C to +85 °C, ensuring therapy timing compliance without external calibration.

Smart Energy Meter

POS Terminal with Receipt Logging

Use Scenario: Tamper-resistant time stamping of kWh consumption events during grid outages.

IC Role / Device Role / Timing Role: Secure RTC with battery low flag, century bit support, and non-volatile SRAM for tamper logs.

Use Value: Uses 7-byte SRAM to store last valid meter reading and outage duration, recoverable after >5-year coin-cell life.

Use Scenario: Synchronized transaction logging across multiple receipt printers and payment modules.

IC Role / Device Role / Timing Role: Centralized time source providing 1 Hz SQW output for system-wide event synchronization.

Use Value: 32 kHz SQW default enables precise 1 ms timer resolution in host MCU without additional crystal cost or layout area.

Equivalent & Alternatives

The following parts are listed as comparable options for similar real-time clock applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
DS3231SN#T&R	TCXO-based ±2 ppm accuracy; higher 1.5 µA battery current; no embedded crystal in SO package	Preferred where highest accuracy is mandatory and board space allows external TCXO compensation	Select DS3231 for metrology-grade timing; avoid if ultra-low power (<500 nA) or crystal integration is required
PCF8563T/2,118	Lower-cost I²C RTC; ±25 ppm accuracy; no analog calibration; 0.25 µA battery current	Suitable for consumer appliances where ±1 min/month drift is acceptable	Choose PCF8563 for cost-sensitive designs lacking calibration requirements or backup-mode interrupt needs

Compared with DS3231SN#T&R and PCF8563T/2,118, the M41T83RQA6F uniquely balances ±5 ppm factory accuracy, embedded crystal integration, and 365 nA battery draw-making it optimal for industrial loggers needing long-life autonomy without external tuning components.

Availability

M41T83RQA6F is available at Aetrix Electronics and suitable for industrial data loggers, medical infusion pumps, smart energy meters, and POS terminals requiring stable component supply across extended temperature ranges and multi-year battery life.

Supply support for M41T83RQA6F 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, specializing in microcontrollers, power management, and precision analog ICs with strong automotive and industrial focus.

The M41T83 belongs to ST's real-time clock product line, designed specifically for battery-backed timekeeping in space-constrained, reliability-critical embedded systems where crystal integration and low-power operation are essential.

FAQ

What is the function of the DU pin on M41T83RQA6F?

The DU (Disable Unused) pin is a no-connect terminal that must be tied to VCC per STMicroelectronics' design guidance. It serves no functional role in the QFN16 package and is reserved for future compatibility. Leaving it unconnected risks undefined behavior during power transitions.

Does M41T83RQA6F support leap year correction automatically?

Yes. The M41T83RQA6F automatically adjusts calendar counters for February lengths (28, 29, 30, or 31 days) based on BCD-encoded year and month registers. Leap year calculation follows Gregorian calendar rules and requires no host MCU intervention.

Can the SQW output be disabled or reconfigured after power-up?

Yes. The SQW output defaults to 32 kHz but can be disabled or set to 1 Hz, 1.024 kHz, or 4.096 kHz via the SQWE (Square Wave Enable) bit and frequency select bits in the control register. Configuration persists across VCC power cycles but resets during VBAT-only operation.

How does the M41T83RQA6F handle oscillator failure detection?

The device continuously monitors crystal oscillation and asserts the OFIE (Oscillator Fail Interrupt Enable) flag within 2 seconds of stoppage. This triggers IRQ1/FT/OUT if enabled, allowing host firmware to log failure or initiate recovery-critical for time-sensitive safety systems.

M41T83RQA6F Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 16-VQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Type:: Clock/Calendar

Features:: Alarm, Leap Year, Square Wave Output, SRAM, Watchdog Timer

Memory Size:: 7B

Time Format:: HH:MM:SS:hh (24 hr)

Date Format:: YY-MM-DD-dd

Interface:: I2C, 2-Wire Serial

Voltage - Supply:: 2.7V ~ 5.5V

Voltage - Supply, Battery:: 2V ~ 5.5V

Current - Timekeeping (Max):: 10µA @ 5.5V

Operating Temperature:: -40°C ~ 85°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 16-QFN (4x4)

M41T83RQA6F FAQ

1.How can I place an order for M41T83RQA6F through Aetrix?

Please submit a Request for Quotation (RFQ) for M41T83RQA6F 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 M41T83RQA6F reliable?

The price and inventory of M41T83RQA6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M41T83RQA6F is usually 5 days.

3.What payment methods are accepted for M41T83RQA6F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M41T83RQA6F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M41T83RQA6F?

M41T83RQA6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M41T83RQA6F 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 M41T83RQA6F?

For technical support, including M41T83RQA6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M41T83RQA6F requirements.

6.How does Aetrix verify that M41T83RQA6F is sourced from the original manufacturer or authorized distributors?

All M41T83RQA6F 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 M41T83RQA6F meets industry standards.

7.What is the process for return or replacement of M41T83RQA6F?

All M41T83RQA6F units undergo pre-shipment inspection (PSI). If there is an issue with M41T83RQA6F, 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 M41T83RQA6F part is unused and in its original packaging.

Return procedure for M41T83RQA6F:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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