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

STMicroelectronics M41T83SMY6F

Name: M41T83SMY6F
Brand: STMicroelectronics
SKU: M41T83SMY6F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M41T83SMY6F

Manufacturer:: STMicroelectronics

Category:: Real Time Clocks

Package:: 18-SOX, 18-SOIC with Crystal (7.5mm Width)

Datasheet:: M41T83SMY6F.pdf

Description:: IC RTC CLK/CALENDAR I2C 18SOX

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Product details

Overview

M41T83SMY6F from STMicroelectronics is a serial I²C real-time clock (RTC) with embedded 32.768 kHz crystal in SOX18 package, providing battery-backed timekeeping, dual alarms, watchdog timer, 8-bit counter/timer, and 7-byte SRAM. It operates from 2.38 V to 5.50 V, achieves ±5 ppm factory-calibrated accuracy after two reflows, and consumes only 365 nA in battery backup mode. Used in industrial control panels requiring long-term timestamping during mains loss.

For engineers reviewing the M41T83SMY6F datasheet, M41T83SMY6F pinout, M41T83SMY6F application, or M41T83SMY6F equivalent, key selection criteria include embedded crystal integration, ultra-low backup current, programmable analog/digital calibration, and dual-alarm interrupt capability under VBAT operation.

Technical Context

The M41T83SMY6F implements a fully autonomous RTC subsystem with integrated oscillator circuitry - the SOX18 package embeds a precision 32.768 kHz crystal, eliminating external load capacitor requirements and layout sensitivity. Its I²C interface supports 400 kHz protocol with automatic address incrementing across 32 registers.

It features dual independent alarm comparators (A1IE/A2IE), a watchdog timer with configurable timeout, and a programmable 8-bit countdown timer with interrupt enable (TIE). The device includes oscillator fail detection, battery low flag, and power-on reset (RST) output with fixed 2.93 V switchover threshold for the 'S' variant.

Key Specifications

Parameter	Value and Actual Design Meaning
Backup Current	365 nA - enables >10-year coin-cell battery life in backup mode
Accuracy	±5 ppm typical after 2 reflows - stable timekeeping without post-assembly recalibration
Operating Voltage	2.38 V to 5.50 V - supports wide-input industrial power rails and brownout resilience
I²C Speed	400 kHz - compatible with standard fast-mode microcontroller peripherals
SRAM Size	7 bytes battery-backed - retains critical state or calibration data during power loss
Alarm Count	2 programmable alarms - enables dual-event scheduling (e.g., wake + log)
Timer Resolution	244.1 µs to 4.25 hrs - selectable via 4-bit prescaler for flexible timing intervals
Temp Range	–40 °C to +85 °C - qualified for extended industrial ambient conditions

Pinout & Package

Package: SOX18 (18-lead plastic small outline, 300 mil, embedded crystal, 11.61 mm × 7.62 mm).

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 16, 17, 18	NF (No Connect)	Internally unused; must be tied to VSS per datasheet
4	SQW	Programmable square wave output; defaults to 32 kHz on power-up
5	NC	No internal connection; left floating or grounded
6	RST	Open-drain power-on reset output; active-low, 2.93 V threshold
7	IRQ2	Open-drain interrupt output for Alarm 2
8	SCL	I²C clock input; requires pull-up to VCC
9	SDA	I²C bidirectional data line; requires pull-up to VCC
10	VSS	Digital ground reference
11	VBAT	Battery supply input; powers RTC during main power loss
12	VCC	Main supply voltage (2.38–5.50 V)
13	IRQ1/FT/OUT	Open-drain multifunction pin: Alarm 1 interrupt, frequency test, or general-purpose output
14, 15	NC	No internal connection; left floating or grounded

Key Features

Feature	Design Value
Embedded Crystal	SOX18 package integrates factory-trimmed 32.768 kHz crystal - eliminates external component count and layout tuning
Dual Alarm System	Two independent BCD-compare alarms with separate interrupt outputs (IRQ1/IRQ2) - enables concurrent event triggers
Calibration Flexibility	Combined analog (load capacitance adjustment) and digital (periodic counter correction) calibration - supports field accuracy optimization
Power Switchover Logic	Fixed 2.93 V VSO threshold with automatic VBAT takeover - ensures seamless timekeeping during brownout
Oscillator Fail Detection	Dedicated circuit monitors crystal oscillation and asserts flag/interrupt - prevents silent time drift failure
OTP Memory	8 bits of one-time-programmable memory - stores unique device identifiers or calibration offsets

Applications

Industrial Data Logger

Smart Energy Meter

Use Scenario: Records sensor readings with precise timestamps during grid outages using coin-cell backup.

IC Role / Device Role / Timing Role: Primary RTC with battery-switchover and oscillator fail detection ensures timestamp integrity.

Use Value: 365 nA backup current extends 12-month CR2032 life beyond 10 years; embedded crystal avoids aging-induced drift.

Use Scenario: Maintains billing calendar and tariff schedule across daily power cycles and seasonal firmware updates.

IC Role / Device Role / Timing Role: Time-of-day/calendar engine with century-bit support and leap-year correction.

Use Value: ±5 ppm accuracy minimizes cumulative error to <1.6 seconds/month; dual alarms trigger tariff switches and diagnostics.

Medical Infusion Pump

Railway Signaling Controller

Use Scenario: Tracks therapy duration and logs dose events with audit-trail timestamps compliant with IEC 62304.

IC Role / Device Role / Timing Role: Safety-critical timekeeper with watchdog timer and battery-low warning.

Use Value: Watchdog timeout resets MCU on firmware hang; RST output synchronizes system reset with clock domain.

Use Scenario: Synchronizes interlocking logic and event logging across distributed trackside cabinets operating at –40 °C.

IC Role / Device Role / Timing Role: Industrial-grade RTC with extended temperature qualification and ESD-hardened I²C pins.

Use Value: –40 °C to +85 °C operation ensures reliability in unheated enclosures; open-drain IRQ pins interface directly with 24 V PLC inputs.

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	±2 ppm accuracy, integrated TCXO, higher 1.3 µA backup current	Higher precision required; less sensitive to temperature variation	Select for sub-second monthly drift; avoid if coin-cell lifetime >10 years is mandatory
PCF8563T/2,118	300 nA backup current, no embedded crystal, ±20 ppm accuracy	Cost-sensitive designs accepting lower accuracy; external crystal layout acceptable	Select when BOM cost reduction outweighs crystal placement complexity and calibration effort

Compared with DS3231SN#T&R, M41T83SMY6F trades absolute accuracy for ultra-low power and embedded simplicity; versus PCF8563T/2,118, it delivers superior stability and eliminates crystal matching risk at modest cost premium.

Availability

M41T83SMY6F is available at Aetrix Electronics and suitable for industrial data loggers, smart energy meters, medical infusion pumps, and railway signaling controllers requiring stable component supply across extended product lifecycles.

Supply support for M41T83SMY6F 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, designing and manufacturing microcontrollers, power ICs, sensors, and timing solutions for industrial, automotive, and consumer markets.

The M41T8x series targets industrial and infrastructure applications demanding high reliability, long-term timekeeping autonomy, and minimal external component count - especially where embedded crystal integration reduces design risk.

FAQ

What is the function of the DU pin on M41T83SMY6F?

The DU (Don't Use) pin (Pin 3) must be tied to VCC and has no internal function. Leaving it unconnected violates the SOX18 package specification and may cause undefined behavior during power transitions. This requirement is explicitly stated in the datasheet's pin description table and hardware hookup diagrams.

Does M41T83SMY6F support I²C clock stretching?

Yes - the M41T83SMY6F supports I²C clock stretching during register read/write operations. When internal processing (e.g., BCD-to-binary conversion or alarm comparison) is ongoing, the device holds SCL low until ready, ensuring data coherency without host-side timing assumptions.

How is the century bit implemented in the M41T83SMY6F calendar?

The M41T83SMY6F uses two dedicated bits (CB1:CB0) in the century register to encode years 2000–2099 (00), 2100–2199 (01), 2200–2299 (10), and 2300–2399 (11). These bits auto-advance with year rollover and are accessible via register address 0x04, enabling unambiguous Y2K+ compliance without software workarounds.

Can the SQW output be disabled or repurposed?

Yes - the SQW output is controlled by the SQWE (Square Wave Enable) bit in the control register (address 0x0E). Clearing SQWE disables the output driver, placing SQW in high-impedance state. It cannot be reassigned to other functions; its sole purpose is 32.768 kHz or divided-frequency waveform generation.

M41T83SMY6F Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 18-SOX, 18-SOIC with Crystal (7.5mm Width)

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:: 3V ~ 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:: 18-SOX

M41T83SMY6F FAQ

1.How can I place an order for M41T83SMY6F through Aetrix?

Please submit a Request for Quotation (RFQ) for M41T83SMY6F 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 M41T83SMY6F reliable?

The price and inventory of M41T83SMY6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M41T83SMY6F is usually 5 days.

3.What payment methods are accepted for M41T83SMY6F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M41T83SMY6F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M41T83SMY6F?

M41T83SMY6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M41T83SMY6F 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 M41T83SMY6F?

For technical support, including M41T83SMY6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M41T83SMY6F requirements.

6.How does Aetrix verify that M41T83SMY6F is sourced from the original manufacturer or authorized distributors?

All M41T83SMY6F 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 M41T83SMY6F meets industry standards.

7.What is the process for return or replacement of M41T83SMY6F?

All M41T83SMY6F units undergo pre-shipment inspection (PSI). If there is an issue with M41T83SMY6F, 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 M41T83SMY6F part is unused and in its original packaging.

Return procedure for M41T83SMY6F:

1.Submit a request within 90 days.

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

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