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STMicroelectronics M24256-DFMC6TG
- Part No.:
- M24256-DFMC6TG
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
M24256-DFMC6TG.pdf
- Description:
- IC EEPROM 256KBIT I2C 8UFDFPN
- Quantity:
- Payment:
- Shipping:
Inventory:73,930
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Product details
Overview
M24256-DFMC6TG from STMicroelectronics is a 256-Kbit I²C-compatible serial EEPROM organized as 32 K × 8 bits, featuring an additional 64-byte identification page with permanent lock capability. It operates from 1.7 V to 5.5 V, supports 1 MHz I²C clock, and delivers byte/page write within 5 ms across –40 °C to +85 °C - deployed in industrial sensor calibration storage and embedded system configuration retention.
For engineers reviewing the M24256-DFMC6TG datasheet, M24256-DFMC6TG pinout, M24256-DFMC6TG application, or M24256-DFMC6TG equivalent, key selection factors include its 1.7 V minimum supply, identification page locking mechanism, WC-controlled full-array write protection, and ECOPACK2-compliant UFDFPN8 (2×3 mm) package with verified bump mapping.
Technical Context
The device implements a slave-only I²C interface with hardware address decoding via E2/E1/E0 inputs, supporting standard (100 kHz), fast (400 kHz), and fast-plus (1 MHz) modes. Its internal architecture includes ECC logic applied per 4-byte group for single-bit error correction during reads, and a dedicated HV generator for reliable EEPROM programming.
Write control (WC) enables hardware-level memory protection: high WC disables all write operations (including identification page writes), while low or floating WC permits byte, page, and ID-page instructions. The identification page (64 bytes) is accessible via distinct device select code (1011b) and supports permanent lock via a specific command with A10 = 1 and data pattern xxxx xx1x.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 Kbit (32 Kbyte), organized as 32 K × 8 bits - sufficient for firmware parameter tables or multi-sensor calibration data sets |
| I²C speed | Up to 1 MHz - enables rapid configuration loading in time-critical boot sequences |
| Supply voltage | 1.7 V to 5.5 V - interoperable with 1.8 V logic and legacy 3.3/5 V systems without level shifters |
| Write time | ≤5 ms for byte or page write - deterministic timing simplifies host-side polling or timeout design |
| Endurance | 4 million write cycles - supports frequent field-updatable calibration or logging in industrial edge nodes |
| Data retention | 200 years at 85 °C - ensures long-term reliability in sealed automotive or energy metering enclosures |
| Identification page | 64-byte dedicated area with permanent lock - secures cryptographic keys or device-specific identifiers against overwrite |
Pinout & Package
UFDFPN8 (2×3 mm) package with exposed thermal pad (ECOPACK2 compliant); pin 1 marked by die corner notch or laser marking; RoHS- and halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| E0 | Chip enable LSB | Configures 3-bit device address (b1 of 7-bit I²C address); tied high/low to select among up to 8 devices on same bus |
| E1 | Chip enable middle bit | Part of hardware address encoding; floating reads as low - enables fixed-address deployment without external resistors |
| E2 | Chip enable MSB | Completes 3-bit chip enable; combined with E0/E1, defines unique I²C slave address in multi-device systems |
| SDA | Serial data I/O | Open-drain bidirectional line; requires external pull-up; shares bus with other I²C peripherals |
| SCL | Serial clock input | Master-generated clock; rising edge samples SDA; falling edge allows SDA transition - defines timing compliance window |
| WC | Write control | Active-high hardware lock: high = full memory array write-inhibited; low/floating = write enabled |
| VCC | Supply voltage | 1.7–5.5 V DC input; decoupling capacitor (10–100 nF) required near pins for stable write operation |
| VSS | Ground reference | Return path for VCC; must be low-impedance connection to minimize noise coupling into EEPROM core |
Key Features
| Feature | Design Value |
|---|---|
| Identification page with lock | 64-byte dedicated memory region writable only once after lock command - prevents tampering with security-critical data |
| Hardware write protection | WC pin disables all write operations including page and ID-page writes - eliminates software vulnerability to accidental overwrites |
| ECC per 4-byte group | Single-bit error correction on read - improves data integrity in electrically noisy industrial environments without host-side overhead |
| Multi-voltage compatibility | 1.7 V min supply enables direct interfacing with ultra-low-power MCUs (e.g., STM32L4/L5) without voltage translation |
| ECOPACK2 packaging | UFDFPN8 (2×3 mm) with halogen-free materials - meets IPC/JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) |
Applications
| Industrial Sensor Calibration | Automotive Body Control Module |
|---|---|
Use Scenario: Storing factory-calibrated temperature/pressure offset coefficients and linearization parameters for field-deployed sensors. IC Role / Device Role / Timing Role: Nonvolatile configuration storage accessed during power-on initialization; retains values across 10+ year service life. Use Value: Eliminates need for external calibration EEPROM or MCU flash wear management; 200-year retention ensures accuracy over product lifetime. | Use Scenario: Holding seat position memory, mirror angle presets, and lighting configuration profiles in vehicle door modules. IC Role / Device Role / Timing Role: I²C slave storing user preferences; accessed via body controller MCU during wake-up sequence. Use Value: 1.7 V operation guarantees reliable read/write during cold-cranking (battery dip to 6 V → ~1.8 V at 3.3 V rail); WC pin prevents corruption during transient faults. |
| Smart Energy Metering | Medical Diagnostic Equipment |
Use Scenario: Recording tariff schedules, billing cycle counters, and tamper-event logs in electricity/water meters with 15+ year field life. IC Role / Device Role / Timing Role: Secure, long-life data logger; identification page stores meter serial and cryptographic keys locked at factory. Use Value: Permanent ID-page lock prevents reprogramming of security credentials; 4M-cycle endurance supports daily log updates for >10 years. | Use Scenario: Saving patient-specific calibration constants (e.g., transducer gain, offset) and regulatory audit trails in portable ultrasound or ECG units. IC Role / Device Role / Timing Role: Fail-safe configuration store; ECC ensures clinical-grade data integrity during battery-backed operation. Use Value: ECC-per-group correction maintains diagnostic accuracy despite radiation-induced soft errors; -40°C to +85°C rating covers sterilization and field use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C256C-SSHL-T | 256 Kbit I²C EEPROM; 1.7–5.5 V; no identification page; max 1 MHz; 1 million write cycles | Lacks permanent-lock ID page and ECC; suitable for basic configuration storage without security requirements | Select when cost sensitivity outweighs need for secure credential storage or enhanced data integrity |
| BR24G256FJ-3GE2 | 256 Kbit I²C EEPROM; 1.6–5.5 V; includes WP pin but no ID page; 4 million cycles; 100-year retention | Offers wider voltage range and comparable endurance, but no dedicated locked page for keys or identifiers | Prefer for ultra-low-voltage designs (<1.7 V) where ID-page security is not mandated |
Compared with AT24C256C-SSHL-T and BR24G256FJ-3GE2, M24256-DFMC6TG uniquely provides a permanently lockable 64-byte identification page and per-group ECC - critical for applications requiring cryptographic key persistence and field-read reliability under EMI stress.
Availability
M24256-DFMC6TG is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, and smart energy metering requiring stable component supply, long-term lifecycle support, and ECOPACK2-compliant packaging.
Supply support for M24256-DFMC6TG 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 memory solutions for industrial, automotive, and consumer markets.
M24256-DFMC6TG belongs to ST's M24 serial EEPROM product line, engineered for robust nonvolatile storage in harsh environments - emphasizing extended temperature operation, high endurance, and hardware-based data protection features.
FAQ
What is the function of the WC pin on M24256-DFMC6TG?
The WC (Write Control) pin is an active-high hardware lock that disables all write operations to the entire memory array-including byte, page, and identification page writes-when driven high. When low or left floating, writes are enabled. This provides fail-safe protection against accidental or malicious overwrites during power transients or firmware bugs, independent of software state.
How does the identification page differ from main memory in M24256-DFMC6TG?
The identification page is a dedicated 64-byte memory region accessible only via I²C device select code 1011b (vs. 1010b for main memory). It supports write and permanent lock commands; once locked, it becomes read-only and cannot be rewritten. Unlike main memory, its lock status is verified via a truncated command returning ACK/NoAck - enabling secure storage of keys or serial numbers.
Does M24256-DFMC6TG require external pull-up resistors on SDA/SCL lines?
Yes - SDA and SCL are open-drain outputs requiring external pull-up resistors to VCC. STMicroelectronics recommends calculating resistor values based on bus capacitance and desired rise time; typical values range from 1.8 kΩ (for 1 MHz, low-capacitance buses) to 10 kΩ (for 100 kHz, longer traces). No internal pull-ups are provided.
Can M24256-DFMC6TG operate reliably at 1.7 V during power-up sequences?
Yes - the device incorporates an internal power-on-reset (POR) circuit that holds the EEPROM in reset until VCC exceeds the POR threshold (lower than 1.7 V), then enters standby mode. Full functionality begins only after VCC stabilizes within 1.7–5.5 V. This ensures no spurious writes occur during brown-out or ramp-up conditions.
M24256-DFMC6TG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 1 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 450 ns
- Voltage - Supply:
- 1.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-UFDFPN (2x3)
M24256-DFMC6TG FAQ
1.How can I place an order for M24256-DFMC6TG through Aetrix?
Please submit a Request for Quotation (RFQ) for M24256-DFMC6TG 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 M24256-DFMC6TG reliable?
The price and inventory of M24256-DFMC6TG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M24256-DFMC6TG is usually 5 days.
3.What payment methods are accepted for M24256-DFMC6TG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M24256-DFMC6TG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M24256-DFMC6TG?
M24256-DFMC6TG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M24256-DFMC6TG 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 M24256-DFMC6TG?
For technical support, including M24256-DFMC6TG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M24256-DFMC6TG requirements.
6.How does Aetrix verify that M24256-DFMC6TG is sourced from the original manufacturer or authorized distributors?
All M24256-DFMC6TG 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 M24256-DFMC6TG meets industry standards.
7.What is the process for return or replacement of M24256-DFMC6TG?
All M24256-DFMC6TG units undergo pre-shipment inspection (PSI). If there is an issue with M24256-DFMC6TG, 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 M24256-DFMC6TG part is unused and in its original packaging.
Return procedure for M24256-DFMC6TG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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