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

STMicroelectronics M41T00SC64MY6E

Name: M41T00SC64MY6E
Brand: STMicroelectronics
SKU: M41T00SC64MY6E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M41T00SC64MY6E

Manufacturer:: STMicroelectronics

Category:: Real Time Clocks

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

Datasheet:: M41T00SC64MY6E.pdf

Description:: IC RTC CLK/CALENDAR I2C 18SOX

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Product details

Overview

M41T00SC64MY6E from STMicroelectronics is a monolithic integrated circuit combining a serial real-time clock (RTC) with embedded 32.768 kHz crystal and a 64 Kbit (8192 × 8) I²C EEPROM in a single 18-pin SOIC package. It provides BCD-formatted timekeeping (seconds to century), automatic leap-year compensation, battery-backed operation with 600 nA typical V_BAT current, and supports 400 kHz I²C protocol for both RTC and EEPROM functions.

For engineers reviewing the M41T00SC64MY6E datasheet, M41T00SC64MY6E pinout, M41T00SC64MY6E application, or M41T00SC64MY6E equivalent, this device serves as a space- and power-constrained solution for time-stamped data logging, firmware configuration storage, and battery-backed system state retention in industrial controllers, point-of-sale terminals, and network infrastructure equipment.

Technical Context

The M41T00SC64 integrates two independent I²C slave devices on one die: the M41T00S RTC (device address 0xD0/0xD1) and the M24C64 EEPROM (device address 0xA0–0xA7). Both share SDA/SCL but operate with distinct control logic, register maps, and timing - RTC uses dedicated calendar registers (0x00–0x07), while EEPROM uses standard byte/page addressing across 8192 bytes.

Its embedded crystal package enables factory calibration to ±5 ppm at 25°C, with aging drift specified as ±3 ppm (Year 1) and ±1 ppm/year thereafter. The integrated power-fail detection circuit automatically switches to V_BAT (2.5–3.5 V) when V_CC drops below threshold, sustaining RTC operation and preserving EEPROM contents without external supervision.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply voltage	2.7 V to 5.5 V - supports direct connection to common microcontroller I/O rails without level-shifting.
I²C speed	Up to 400 kHz - enables fast time reads and EEPROM writes within standard fast-mode timing budgets.
Battery current	600 nA typical at 3 V - extends coin-cell life beyond 9.5 years with 50 mAh BR1225 battery.
RTC accuracy	±5 ppm at 25°C, ±3 ppm Year 1 drift - eliminates need for field calibration in temperature-stable environments.
EEPROM endurance	>1 million erase/write cycles - suitable for frequent parameter updates such as calibration offsets or usage counters.
Data retention	>40 years - ensures long-term firmware or configuration persistence without refresh.
Operating temp	–40°C to +85°C - qualified for industrial-grade deployment without derating.

Pinout & Package

Package: 18-pin SOIC (SOX18), 300-mil width, with embedded 32.768 kHz crystal. RoHS-compliant ECOPACK® lead-free finish.

Pin/Terminal	Circuit Role	Design Meaning
1	WC	Write Control input - active-low hardware write protect for EEPROM; overrides I²C write commands when asserted.
4–6, 9, 12–13, 15	NC / NF	No-connect or no-function pins - must be tied to V_SS per datasheet; internal shorts exist between pins 2–3 and 16–17.
7	V_SS	Ground reference - primary return path for RTC, EEPROM, and interface logic.
8	V_BAT	Battery supply input - powers RTC during main supply failure; accepts 2.5–3.5 V lithium coin cell.
10	V_CC	Main supply input - powers all digital logic and EEPROM programming; range 2.7–5.5 V.
11	E0	Chip enable bit 0 - sets LSB of EEPROM I²C address (0xA0–0xA7); grounded or pulled high to configure device ID.
14	E1	Chip enable bit 1 - middle bit of EEPROM I²C address; used with E0/E2 to support up to 8 EEPROMs on same bus.
16–17	E2	Chip enable bit 2 - MSB of EEPROM I²C address; pins 16 and 17 are internally shorted.
18	FT/OUT	Open-drain frequency test/output - configurable as 1 Hz square wave or crystal test output; requires external pull-up.

Key Features

Feature	Design Value
Embedded crystal + factory calibration	Eliminates external crystal layout, load capacitor tuning, and post-SMT calibration labor.
Automatic power-fail switchover	Zero-software-intervention transition to battery backup preserves time continuity and prevents EEPROM corruption.
Software clock calibration register	Allows fine-tuning of RTC drift via EEPROM address 0x1550 - enables field compensation without hardware change.
Dual I²C slave addressing	RTC (0xD0/0xD1) and EEPROM (0xA0–0xA7) coexist on same bus without address conflict or arbitration overhead.
Special programmable output (FT/OUT)	Configurable 1 Hz time tick or crystal activity monitor - simplifies debugging and system-level timing verification.

Applications

Industrial PLC Time Stamping

POS Terminal Configuration Storage

Use Scenario: Recording timestamped I/O events and alarm triggers in programmable logic controllers operating across wide ambient temperatures.

IC Role / Device Role / Timing Role: Primary RTC source providing BCD-encoded wall-clock time with automatic leap-year handling and battery-backed continuity.

Use Value: Ensures deterministic, traceable event logs even during brownouts - critical for regulatory compliance and root-cause analysis.

Use Scenario: Storing tax rates, receipt templates, and user preferences in retail point-of-sale terminals subject to frequent firmware updates.

IC Role / Device Role / Timing Role: Dual-function device: EEPROM retains configuration data across reboots; RTC timestamps transaction records and audit logs.

Use Value: Reduces BOM count by merging two essential nonvolatile functions into one footprint, lowering assembly cost and board area.

Network Equipment Boot Integrity

Medical Device Usage Logging

Use Scenario: Validating firmware signature freshness and enforcing secure boot policies in routers and switches with strict uptime requirements.

IC Role / Device Role / Timing Role: Provides trusted time source for certificate validity checks and cryptographic nonce generation during boot sequence.

Use Value: Enables time-bound security enforcement without relying on NTP synchronization - essential for air-gapped or offline deployments.

Use Scenario: Tracking cumulative operational hours, calibration cycles, and service intervals in portable diagnostic instruments.

IC Role / Device Role / Timing Role: Battery-backed RTC maintains accurate elapsed time; EEPROM stores maintenance history with >40-year retention.

Use Value: Supports FDA-mandated device lifecycle traceability and automated service alerts without external time sync dependency.

Equivalent & Alternatives

The following parts are listed as comparable options for similar RTC+EEPROM integration applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Maxim DS1340Z+	Standalone RTC only (no EEPROM); 32KHz crystal required externally; lower battery current (300nA).	Lacks integrated nonvolatile storage - requires separate EEPROM or MCU flash for configuration data.	Select when ultra-low-power RTC-only function is prioritized and board space allows discrete crystal + EEPROM.
ST M41T81SM6F	Higher-accuracy RTC (±3.5 ppm), no embedded crystal, 64Kbit EEPROM, but uses larger 28-pin SOIC and lacks FT/OUT pin.	Requires external crystal and load capacitors; no 1 Hz output for system timing verification.	Choose when tighter initial accuracy is needed and PCB layout accommodates external crystal placement.

Compared with DS1340Z+ and M41T81SM6F, the M41T00SC64MY6E uniquely delivers calibrated RTC + EEPROM in one compact SOX18 package with factory-trimmed crystal and debug-friendly FT/OUT - optimizing for minimal component count and field-deployable reliability in space-constrained industrial designs.

Availability

M41T00SC64MY6E is available at Aetrix Electronics and suitable for industrial automation, point-of-sale systems, and network infrastructure requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for M41T00SC64MY6E 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 analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The M41T00SC64 belongs to ST's Real-Time Clock + Memory family, engineered to reduce system-level complexity by integrating timekeeping and nonvolatile storage in a single, factory-calibrated package for embedded applications demanding reliability and long-term availability.

FAQ

What is the function of the FT/OUT pin?

The FT/OUT pin is an open-drain output that can be configured via internal register to deliver either a 1 Hz square wave (for timekeeping synchronization) or a buffered 32.768 kHz crystal signal (for oscillator health monitoring). It requires an external pull-up resistor and operates independently of the I²C bus state.

How does the M41T00SC64 handle power failure and battery switchover?

The device includes an integrated voltage-sense circuit that continuously monitors V_CC. When V_CC drops below the switchover threshold (~2.5 V), it automatically disconnects V_CC and connects V_BAT to sustain RTC operation and preserve EEPROM contents - no host intervention or external circuitry is required.

Can the embedded crystal be replaced or adjusted?

No - the 32.768 kHz crystal is permanently molded inside the SOX18 package during manufacturing and cannot be replaced or tuned. Calibration is performed at wafer/test level and stored in EEPROM address 0x1550; users may apply software fine-tuning but not mechanical crystal adjustment.

What is the I²C address mapping for RTC and EEPROM functions?

The RTC portion responds to I²C addresses 0xD0 (write) and 0xD1 (read), while the EEPROM uses addresses 0xA0–0xA7 depending on E0/E1/E2 pin states. These are hard-coded in silicon and cannot be changed via software - ensuring deterministic multi-device bus operation without address collision.

M41T00SC64MY6E 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:: EEPROM, Leap Year

Memory Size:: 8KB

Time Format:: HH:MM:SS

Date Format:: YY-MM-DD-dd

Interface:: I2C, 2-Wire Serial

Voltage - Supply:: 2.7V ~ 5.5V

Voltage - Supply, Battery:: 2.5V ~ 35V

Current - Timekeeping (Max):: 100µA (Typ) @ 2.7V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 18-SOX

M41T00SC64MY6E FAQ

1.How can I place an order for M41T00SC64MY6E through Aetrix?

Please submit a Request for Quotation (RFQ) for M41T00SC64MY6E 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 M41T00SC64MY6E reliable?

The price and inventory of M41T00SC64MY6E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M41T00SC64MY6E is usually 5 days.

3.What payment methods are accepted for M41T00SC64MY6E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M41T00SC64MY6E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M41T00SC64MY6E?

M41T00SC64MY6E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M41T00SC64MY6E 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 M41T00SC64MY6E?

For technical support, including M41T00SC64MY6E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M41T00SC64MY6E requirements.

6.How does Aetrix verify that M41T00SC64MY6E is sourced from the original manufacturer or authorized distributors?

All M41T00SC64MY6E 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 M41T00SC64MY6E meets industry standards.

7.What is the process for return or replacement of M41T00SC64MY6E?

All M41T00SC64MY6E units undergo pre-shipment inspection (PSI). If there is an issue with M41T00SC64MY6E, 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 M41T00SC64MY6E part is unused and in its original packaging.

Return procedure for M41T00SC64MY6E:

1.Submit a request within 90 days.

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

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