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

STMicroelectronics M41T83RMY6E

Name: M41T83RMY6E
Brand: STMicroelectronics
SKU: M41T83RMY6E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M41T83RMY6E

Manufacturer:: STMicroelectronics

Category:: Real Time Clocks

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

Datasheet:: M41T83RMY6E.pdf

Description:: IC RTC CLK/CALENDAR I2C 18SOX

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Product details

Overview

M41T83RMY6E from STMicroelectronics is a serial I²C real-time clock (RTC) with embedded 32.768 kHz crystal in an 18-lead SOIC package, supporting battery switchover, ±5 ppm factory-calibrated accuracy (SOX18), programmable alarms, watchdog timer, 7-byte SRAM, and 32 kHz square wave output. It operates from 2.7 V to 5.5 V and maintains timekeeping across power loss in industrial control panels and medical data loggers.

For engineers reviewing the M41T83RMY6E datasheet, M41T83RMY6E pinout, M41T83RMY6E application, or M41T83RMY6E equivalent, key selection criteria include backup voltage threshold (2.70 V), ultra-low 365 nA battery current, embedded crystal integration eliminating external XTAL layout, and dual-alarm interrupt capability with battery-backed operation.

Technical Context

The M41T83RMY6E implements a fully autonomous RTC core with BCD-encoded calendar registers (century, year, month, date, day, hour, minute, second, tenths/hundredths), automatic leap-year correction, and oscillator fail detection. Its I²C interface complies with 400 kHz Fast Mode timing, with auto-incrementing address register for sequential register access.

Power management includes fixed-reference switchover at V_SO = V_RST = 2.63 V (R-grade), battery low flag monitoring, and halt-bit–controlled oscillator stop during power-down. Calibration uses both digital (±127 ppm stepwise correction) and analog (programmable load capacitance) methods to achieve <±5 ppm accuracy post-reflow.

Key Specifications

Parameter	Value and Actual Design Meaning
Battery Supply Current	365 nA - Enables >10-year coin-cell life (CR2032) in backup mode
Accuracy (Post-Reflow)	±5 ppm typical - Measured at 25°C after two reflows; supports high-precision timestamping
Operating Voltage Range	2.70 V to 5.50 V - Matches wide-input industrial power rails and avoids brown-out resets
I²C Bus Speed	400 kHz - Compatible with standard Fast Mode microcontrollers without clock stretching
Square Wave Output	32.768 kHz default - Provides system clock source or timing reference without external oscillator
User SRAM	7 bytes battery-backed - Stores calibration offsets or event counters across power cycles
Alarm Capability	Dual programmable alarms - Generate interrupts even during battery-only operation for wake-up or alert functions

Pinout & Package

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

Pin/Terminal	Circuit Role	Design Meaning
VCC	Main supply input	Accepts 2.7–5.5 V; powers all logic and oscillator circuits during normal operation
VBAT	Battery backup supply	Connects to coin cell; automatically takes over when VCC drops below 2.63 V
SCL	I²C clock input	Drives internal address counter and register read/write timing; requires pull-up
SDA	I²C bidirectional data	Open-drain; supports multi-master arbitration and ACK/NACK signaling
RST	Reset output	Active-low open-drain signal asserted on power-on or VCC drop below VRST
IRQ1/FT/OUT	Multi-function interrupt pin	Configurable as alarm 1 interrupt, frequency test output, or general-purpose output
IRQ2	Alarm 2 interrupt	Open-drain dedicated interrupt for second alarm event during main or backup power
SQW	Square wave output	32.768 kHz by default; programmable to 1 Hz, 1.024 kHz, or 4.096 kHz for system timing
DU	Power supply tie	Must be connected to VCC; enables internal voltage regulator for stable core operation
NF (Pins 2,3,16,17)	No-connect (internally shorted)	Electrically tied to VSS per datasheet; must be grounded externally for thermal/mechanical stability

Key Features

Feature	Design Value
Embedded 32.768 kHz crystal	Eliminates external XTAL placement, layout sensitivity, and load capacitor tuning - reduces BOM count by 3 components
Programmable analog calibration	Adjusts internal load capacitance (0–12.5 pF in 0.5 pF steps) to compensate for crystal aging and temperature drift
Digital calibration engine	Applies ±127 ppm periodic counter correction via register writes - enables field recalibration without hardware change
Oscillator fail detection	Asserts flag and optional interrupt if crystal stops oscillating - prevents silent timekeeping failure in safety-critical systems
Watchdog timer + 8-bit counter	Independent timeout and countdown functions usable for system supervision or interval measurement without MCU intervention

Applications

Industrial Data Logger

Medical Vital Sign Monitor

Use Scenario: Continuous timestamping of sensor readings (temperature, pressure) during mains power loss and battery backup.

IC Role / Device Role / Timing Role: Primary RTC maintaining absolute UTC time with century-aware BCD calendar and leap-year handling.

Use Value: 365 nA battery current extends CR2032 life beyond 10 years; embedded crystal ensures timing continuity without external component drift.

Use Scenario: Synchronizing ECG waveform capture, alarm triggers, and patient data export in portable monitors.

IC Role / Device Role / Timing Role: Time-of-day clock with dual alarms for scheduled measurements and low-battery warnings.

Use Value: Battery switchover at 2.63 V guarantees uninterrupted timekeeping during AC adapter disconnection or brownouts.

Smart Energy Meter

Building Automation Controller

Use Scenario: Logging kWh consumption, tariff periods, and firmware update timestamps across grid outages.

IC Role / Device Role / Timing Role: High-accuracy timebase for billing-grade metering with ±5 ppm post-reflow stability.

Use Value: Factory calibration + programmable digital/analog trim enables compliance with IEC 62053-62 Class 0.5S timing requirements.

Use Scenario: Coordinating HVAC schedules, lighting scenes, and occupancy-based energy optimization.

IC Role / Device Role / Timing Role: Central timekeeper providing synchronized 1 Hz and 32 kHz outputs to multiple subsystems.

Use Value: SQW output configurable to 1 Hz eliminates need for external divider; 7-byte SRAM stores daily schedule profiles.

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 1.3 µA battery current; no embedded crystal	Requires external 32 kHz crystal and load caps; better tempco but larger footprint	Choose for highest accuracy over temperature range; avoid if board space or BOM reduction is critical
MCP7941T-I/SN	Internal RC oscillator only; ±5 ppm accuracy not guaranteed; no analog calibration	Lacks crystal interface; relies on software trimming; no oscillator fail detection	Choose for cost-sensitive non-critical timing; avoid where long-term stability or failure detection is required

Compared with DS3231SN#T&R and MCP7941T-I/SN, the M41T83RMY6E uniquely combines embedded crystal integration, ultra-low 365 nA backup current, and dual-stage (analog + digital) calibration - making it optimal for space-constrained, battery-life–critical industrial loggers requiring field-trimmable accuracy.

Availability

M41T83RMY6E is available at Aetrix Electronics and suitable for industrial data loggers, medical vital sign monitors, smart energy meters, and building automation controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for M41T83RMY6E 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 designing and manufacturing microcontrollers, analog ICs, power management devices, and timing solutions for industrial, automotive, and consumer markets.

The M41T83 belongs to ST's precision real-time clock product line, engineered specifically for applications demanding autonomous, battery-backed timekeeping with minimal external components and field-adjustable accuracy.

FAQ

What is the exact battery switchover voltage threshold for M41T83RMY6E?

The M41T83RMY6E switches to battery backup at V_SO = V_RST = 2.63 V (R-grade), with hysteresis ensuring clean transition. This threshold is fixed and unadjustable, verified per datasheet DocID012578 Rev 19 Section 2.4 and Table 24. It triggers RST assertion and disables VCC-dependent functions while preserving RTC and SRAM operation.

Does M41T83RMY6E require external load capacitors for its embedded crystal?

No - the SOX18 package integrates a trimmed 32.768 kHz crystal with matched internal load capacitance. External capacitors are unnecessary and must not be added. The device provides programmable analog calibration (0–12.5 pF in 0.5 pF steps) to fine-tune frequency, as specified in Section 3.4.2 and Table 7 of the datasheet.

Can both alarms operate independently during battery-only mode?

Yes - both Alarm 1 (IRQ1/FT/OUT) and Alarm 2 (IRQ2) remain fully functional during battery backup, generating open-drain interrupts that wake connected microcontrollers. This behavior is confirmed in Sections 3.5, 3.6, and Figure 25 of the datasheet, and applies regardless of VCC presence.

What is the function of the DU pin, and how must it be connected?

The DU (Device Usage) pin must be tied directly to VCC; it is not an input or output. Per datasheet Section 1 and Figure 5, DU enables internal voltage regulation for stable core operation. Leaving it floating or connecting to ground causes undefined behavior and potential RTC malfunction - this requirement is mandatory for SOX18 package operation.

M41T83RMY6E Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tube

Product Status:: Obsolete

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:: 18-SOX

M41T83RMY6E FAQ

1.How can I place an order for M41T83RMY6E through Aetrix?

Please submit a Request for Quotation (RFQ) for M41T83RMY6E 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 M41T83RMY6E reliable?

The price and inventory of M41T83RMY6E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M41T83RMY6E is usually 5 days.

3.What payment methods are accepted for M41T83RMY6E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M41T83RMY6E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M41T83RMY6E?

M41T83RMY6E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M41T83RMY6E 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 M41T83RMY6E?

For technical support, including M41T83RMY6E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M41T83RMY6E requirements.

6.How does Aetrix verify that M41T83RMY6E is sourced from the original manufacturer or authorized distributors?

All M41T83RMY6E 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 M41T83RMY6E meets industry standards.

7.What is the process for return or replacement of M41T83RMY6E?

All M41T83RMY6E units undergo pre-shipment inspection (PSI). If there is an issue with M41T83RMY6E, 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 M41T83RMY6E part is unused and in its original packaging.

Return procedure for M41T83RMY6E:

1.Submit a request within 90 days.

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

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