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STMicroelectronics M41T93ZMY6F
- Part No.:
- M41T93ZMY6F
- Manufacturer:
- STMicroelectronics
- Category:
- Real Time Clocks
- Package:
- 18-SOX, 18-SOIC with Crystal (7.5mm Width)
- Datasheet:
-
M41T93ZMY6F.pdf
- Description:
- IC RTC CLK/CALENDAR SPI 18SOX
- Quantity:
- Payment:
- Shipping:
Inventory:5,468
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Product details
Overview
M41T93ZMY6F from STMicroelectronics is a serial SPI real-time clock (RTC) with integrated 32.768 kHz oscillator, battery switchover circuitry, and 7-byte SRAM. It delivers ±5 ppm factory-calibrated accuracy (SOX18), ultra-low 365 nA battery current, 2.38–5.5 V operating range, and supports SPI Mode 0 (CPOL=0, CPHA=0). Used in industrial control panels for time-stamped event logging under intermittent power.
For engineers reviewing the M41T93ZMY6F datasheet, M41T93ZMY6F pinout, M41T93ZMY6F application, or M41T93ZMY6F equivalent, key selection criteria include backup voltage threshold (VSO = 2.32 V), programmable analog/digital calibration, alarm interrupt persistence during battery mode, and embedded crystal vs. external crystal package variants.
Technical Context
The M41T93ZMY6F implements a BCD-encoded calendar engine with automatic leap-year and month-end correction, backed by a crystal-controlled oscillator with dual-stage calibration: programmable load capacitance (analog) and periodic counter offset (digital). Its power management includes fixed-reference switchover at VSO = 2.32 V and tREC-based write protection recovery.
SPI interface logic strictly adheres to Mode 0 timing: SDI latched on SCL rising edge, SDO shifted out on falling edge, with E-driven chip select. The IRQ/FT/OUT pin serves triple function-interrupt assertion, frequency test output, and general-purpose open-drain driver-with priority arbitration defined separately for VCC-active and backup modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Battery supply current | 365 nA - enables >10-year coin-cell life in backup mode |
| Operating voltage range | 2.38 V to 5.5 V - supports direct connection to 3.3 V or 5 V rails without LDO |
| Accuracy (typical) | ±5 ppm after 2 reflows - traceable factory calibration reduces system-level trimming effort |
| SPI interface mode | Mode 0 only (CPOL=0, CPHA=0) - mandates MCU SPI peripheral configuration matching |
| Backup switchover voltage (VSO) | 2.32 V - ensures RTC continuity during brown-out down to ultra-low VCC |
| User SRAM size | 7 bytes - retains critical state or calibration data across power cycles |
| Alarm capability | Dual programmable alarms with interrupt - enables scheduled wake-up and event-triggered actions in sleep mode |
Pinout & Package
Package: SOX18 - 18-lead plastic SOIC (300 mil), 11.61 × 7.62 mm, with embedded 32.768 kHz crystal. Requires external battery only; no external crystal needed.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| E | Chip enable | Active-low SPI slave select; must transition high→low before each operation |
| SDI | Serial data input | Latches command/address/data on SCL rising edge; supports 32-byte register map access |
| SDO | Serial data output | Drives data on SCL falling edge; high-impedance when E is high |
| SCL | Serial clock | Provides synchronous timing; requires CPOL=0, CPHA=0 MCU configuration |
| IRQ/FT/OUT | Multi-function open-drain output | Asserts alarm/watchdog/timer interrupts; outputs test frequency or user-defined signal |
| RST | Power-on reset output | Open-drain active-low reset pulse (trec duration) on VCC rise above VPFD |
| SQW | Square wave output | Programmable 32.768 kHz (default), 1 Hz, or 1.024 kHz; drives external timing loads |
| VBAT | Battery supply input | Connects to coin cell; powers RTC when VCC < 2.32 V; internal switchover is automatic |
| VCC | Main supply voltage | 2.38–5.5 V; powers all digital functions and enables write access to registers/SRAM |
| VSS | Ground reference | Common return path for VCC, VBAT, and signal pins; decoupling required near VCC/VSS |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed oscillator accuracy | ±5 ppm typical post-reflow - eliminates need for external calibration in most industrial applications |
| Dual-stage calibration | Analog (load capacitance) + digital (counter offset) - enables fine-tuning across temperature and aging |
| Battery switchover threshold | Fixed 2.32 V (Z variant) - guarantees uninterrupted timekeeping during deep brown-out conditions |
| Alarm persistence in backup mode | Interrupt remains active even when powered solely by VBAT - supports low-power event detection |
| Watchdog + 8-bit timer | Independent watchdog timeout and programmable countdown timer - enables system supervision without MCU intervention |
Applications
| Industrial Data Logger | Smart Energy Meter |
|---|---|
Use Scenario: Records sensor readings with precise UTC timestamps during grid outages. IC Role / Device Role / Timing Role: Primary RTC with battery-backed timekeeping and alarm-triggered storage flush. Use Value: Maintains sub-second timestamp accuracy for >5 years on CR2032, enabling audit-compliant event logs. |
Use Scenario: Tracks energy consumption intervals and generates billing-period alerts. IC Role / Device Role / Timing Role: Calendar engine with dual alarms for tariff switching and meter-read windows. Use Value: Embedded crystal eliminates external component count; ±5 ppm accuracy meets IEC 62053-62 Class 0.5S requirements. |
| Medical Infusion Pump | Building Automation Controller |
Use Scenario: Logs therapy start/stop times and dosage history with tamper-resistant timestamps. IC Role / Device Role / Timing Role: Secure time source with battery-fail flag and oscillator-stop detection. Use Value: 365 nA backup current extends battery life beyond device service interval; SQW output synchronizes pump motor phases. |
Use Scenario: Coordinates HVAC scheduling, lighting scenes, and occupancy-based overrides across distributed nodes. IC Role / Device Role / Timing Role: Central timebase for networked controllers with alarm-driven action triggers. Use Value: Dual alarms enable simultaneous daily schedule + seasonal DST adjustment; 7-byte SRAM stores local zone offsets. |
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), higher 1.3 μA backup current, I²C-only interface | Superior accuracy but incompatible SPI bus; requires PCB redesign and firmware changes | Select if absolute timing precision outweighs interface compatibility and power budget constraints |
| PCF8563T | I²C interface, 0.8 μA backup current, no built-in crystal, ±25 ppm accuracy | Lacks embedded oscillator and programmable calibration; requires external 32.768 kHz crystal | Choose for cost-sensitive designs where external crystal placement is acceptable and ±25 ppm suffices |
Compared with DS3231SN#T&R and PCF8563T, the M41T93ZMY6F uniquely balances SPI compatibility, embedded crystal convenience, ultra-low 365 nA backup draw, and field-adjustable calibration-making it optimal for space-constrained industrial controllers needing long-term autonomous timekeeping.
Availability
M41T93ZMY6F is available at Aetrix Electronics and suitable for industrial data loggers, smart energy meters, medical infusion pumps, and building automation controllers requiring stable component supply across extended product lifecycles.
Supply support for M41T93ZMY6F 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 for industrial, automotive, and consumer markets.
The M41T93 belongs to ST's real-time clock portfolio designed for robust, low-power timekeeping in harsh environments-emphasizing battery longevity, calibration flexibility, and seamless power-fail resilience.
FAQ
What is the VSO voltage threshold for M41T93ZMY6F?
The M41T93ZMY6F uses the 'Z' suffix variant, specifying a fixed battery switchover voltage (VSO) of 2.32 V. This threshold is internally set and non-adjustable; it triggers automatic transfer from VCC to VBAT when main supply drops below this level, ensuring uninterrupted RTC operation.
Does M41T93ZMY6F require an external crystal?
No. The M41T93ZMY6F in SOX18 package integrates a 32.768 kHz crystal within the molded body. Unlike QFN16 variants, it needs no external crystal or load capacitors-only a VBAT connection (e.g., CR2032) for backup operation.
How many alarm functions does M41T93ZMY6F support?
The M41T93ZMY6F supports two independent programmable alarms: Alarm 1 (standard) and optional Alarm 2. Both generate IRQ/FT/OUT interrupts valid during VCC operation and battery backup mode, with repeat modes including once-per-second, per-minute, per-hour, daily, and monthly.
Can the square wave output be configured to frequencies other than 32.768 kHz?
Yes. The SQW pin defaults to 32.768 kHz on power-up but is programmable to 1 Hz or 1.024 kHz via the square wave register (address 0x14). Output is CMOS-compatible and can drive capacitive loads up to 50 pF without external buffering.
M41T93ZMY6F 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:
- SPI
- Voltage - Supply:
- 2.38V ~ 5.5V
- Voltage - Supply, Battery:
- 1.8V ~ 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
M41T93ZMY6F FAQ
1.How can I place an order for M41T93ZMY6F through Aetrix?
Please submit a Request for Quotation (RFQ) for M41T93ZMY6F 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 M41T93ZMY6F reliable?
The price and inventory of M41T93ZMY6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M41T93ZMY6F is usually 5 days.
3.What payment methods are accepted for M41T93ZMY6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M41T93ZMY6F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M41T93ZMY6F?
M41T93ZMY6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M41T93ZMY6F 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 M41T93ZMY6F?
For technical support, including M41T93ZMY6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M41T93ZMY6F requirements.
6.How does Aetrix verify that M41T93ZMY6F is sourced from the original manufacturer or authorized distributors?
All M41T93ZMY6F 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 M41T93ZMY6F meets industry standards.
7.What is the process for return or replacement of M41T93ZMY6F?
All M41T93ZMY6F units undergo pre-shipment inspection (PSI). If there is an issue with M41T93ZMY6F, 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 M41T93ZMY6F part is unused and in its original packaging.
Return procedure for M41T93ZMY6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M41T93ZMY6F Tags
-
MCP7940N-I/SN
Microchip Technology
-
MCP7940MT-I/MNY
Microchip Technology
-
PCF85063ATL/1,118
NXP USA Inc.
-
MCP7940NT-I/SN
Microchip Technology
-
MCP7940NT-I/MS
Microchip Technology
-
MCP7940N-I/MS
Microchip Technology
-
PCF85063AT/AY
NXP USA Inc.
-
PCF85063TP/1Z
NXP Semiconductors
-
PCF85063ATT/AJ
NXP USA Inc.
-
MCP7940NT-E/SN
Microchip Technology
-
MCP7940NT-I/MNY
Microchip Technology
-
MCP79400T-I/SN
Microchip Technology
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