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STMicroelectronics M24256E-FMC6TG
- Part No.:
- M24256E-FMC6TG
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
M24256E-FMC6TG.pdf
- Description:
- 256-KBIT SERIAL I2C BUS EEPROM W
- Quantity:
- Payment:
- Shipping:
Inventory:2,589
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Product details
Overview
M24256E-FMC6TG from STMicroelectronics is a 256-Kbit I²C-compatible EEPROM organized as 32 K × 8 bits, serving as nonvolatile configuration and calibration storage in embedded systems. It operates from 1.6 V to 5.5 V, supports I²C Fast-mode Plus (1 MHz), features a 64-byte configurable identification page, and includes hardware write protection via the WC pin - deployed in industrial sensor nodes for parameter retention across power cycles.
For engineers reviewing the M24256E-FMC6TG datasheet, M24256E-FMC6TG pinout, M24256E-FMC6TG application, or M24256E-FMC6TG equivalent, key selection considerations include its configurable device address register (CDA), 5 ms typical byte/page write time, 200-year data retention, ultralow 310 nA standby current, and ECOPACK2-compliant TSSOP8 package with 169 mil width.
Technical Context
The M24256E-FMC6TG implements an I²C target-only interface with open-drain SDA and input-only SCL, requiring external pull-up resistors. Its internal architecture includes a high-voltage generator and ECC-enabled sense amplifiers for reliable 4 million write cycles.
It integrates two dedicated memory regions beyond main array: a 64-byte identification page (lockable to read-only) and an 8-bit configurable device address (CDA) register with irreversible DAL bit locking. Write control (WC) disables all writes when high, independent of CDA state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 Kbit (32 K × 8), enabling storage of firmware calibration tables or device-specific identifiers |
| I²C speed modes | Supports Standard-mode (100 kHz), Fast-mode (400 kHz), and Fast-mode Plus (1 MHz) for flexible bus timing integration |
| Page size | 64-byte page write capability - reduces transaction overhead vs. byte-write for bulk configuration updates |
| Write cycle time | Typical 3.2 ms (max 5 ms) for byte/page writes - enables fast field-updatable parameter storage without system stall |
| Supply voltage range | 1.6 V to 5.5 V - interoperable with 1.8 V, 3.3 V, and 5 V logic domains without level shifters |
| Data retention | 200 years at +25 °C - ensures long-term reliability in unattended infrastructure monitoring applications |
| Write endurance | 4 million write cycles - sufficient for daily recalibration over 10+ years of operation |
| Standby current | 310 nA typical - critical for battery-powered IoT edge nodes with multi-year runtime requirements |
Pinout & Package
Package: TSSOP8 (169 mil width), ECOPACK2-compliant, surface-mount, 8-pin thin shrink small outline package.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: SDA | Serial Data I/O | Open-drain bidirectional bus line - requires external pull-up; shares bus with other I²C targets |
| 2: VSS | Ground Reference | Primary return path for VCC and internal logic; must be low-impedance for noise immunity |
| 3: SCL | Serial Clock Input | Asynchronous clock input from master - defines timing for data sampling and ACK generation |
| 4: WC | Hardware Write Control | Active-high write inhibit - blocks all memory/CDA/ID page writes regardless of software lock state |
| 5–8: NC | No Connect | Unbonded pins - no internal connection; must remain unconnected per design |
Key Features
| Feature | Design Value |
|---|---|
| Configurable Device Address (CDA) Register | 8-bit register with C2–C0 bits enabling up to eight I²C addresses on same bus; DAL bit permanently locks configuration |
| 64-byte Identification Page | Dedicated, lockable memory region for storing unique serial numbers or cryptographic keys - writable only before permanent read-only lock |
| Hardware Write Protection | WC pin disables all write operations including CDA and ID page - provides fail-safe protection during power transitions |
| Fast Wake-up Time | <5 μs wake-up from standby - eliminates delay in responding to immediate configuration reads after sleep |
| Enhanced ESD/Latch-up Robustness | Qualified to >4 kV HBM ESD and latch-up immune per JESD78 - suitable for industrial environments with noisy power rails |
Applications
| Industrial Sensor Calibration | Smart Meter Firmware Storage |
|---|---|
|
Use Scenario: Storing temperature-compensated ADC offset/gain coefficients in factory-calibrated pressure sensors operating in harsh environments. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with guaranteed 200-year retention and hardware write protection against field-induced corruption. Use Value: Eliminates need for recalibration during product lifetime; WC pin prevents accidental overwrite during firmware updates or brownout events. |
Use Scenario: Holding tariff tables, metering constants, and security keys in ANSI C12.22-compliant electricity meters with 15+ year field deployment. IC Role / Device Role / Timing Role: Secure, low-power parameter storage supporting AES-128 key management and tamper-evident logging. Use Value: 4 million write cycles enable daily billing log updates for >10 years; identification page stores unique device fingerprints for secure boot verification. |
| Medical Device Configuration | Automotive Body Control Module |
|
Use Scenario: Retaining user-prescribed therapy parameters (e.g., infusion rate limits, alarm thresholds) in portable insulin pumps with lithium coin-cell power. IC Role / Device Role / Timing Role: Ultra-low-power (310 nA standby) nonvolatile memory ensuring data persistence during 6-month battery life. Use Value: Enables FDA-required audit trails and patient safety locks - CDA register allows multiple pump variants on shared I²C bus without address conflict. |
Use Scenario: Storing seat position presets, mirror angles, and lighting profiles in automotive body control modules compliant with AEC-Q100 Grade 2. IC Role / Device Role / Timing Role: Automotive-grade EEPROM with -40 °C to +85 °C operation and enhanced ESD robustness for under-hood CAN gateway interfaces. Use Value: TSSOP8 package fits tight PCB layouts; 1.6 V minimum VCC supports operation during cold-crank battery dips without data loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C256B-SSHL-T (Microchip) | 256 Kbit I²C EEPROM; no CDA register or identification page; max 1 MHz only at 2.5–5.5 V | Lacks configurable addressing and secure ID page - unsuitable for multi-device I²C networks requiring address flexibility | Select when CDA/ID page features are unnecessary and cost sensitivity outweighs configurability needs |
| BR24G256FJ-3GE2 (ROHM) | 256 Kbit I²C EEPROM; supports 1.7–5.5 V; includes write protect pin but no CDA register or ID page | No software-configurable address - requires fixed hardware address assignment; no lockable secure storage region | Choose for basic parameter storage where address collision risk is mitigated by board-level design, not device-level flexibility |
Compared with AT24C256B-SSHL-T and BR24G256FJ-3GE2, the M24256E-FMC6TG uniquely delivers both hardware write protection and software-configurable addressing in a single die - essential for scalable, secure, and field-upgradable embedded systems with evolving I²C topology requirements.
Availability
M24256E-FMC6TG is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter firmware storage, medical device configuration, and automotive body control module applications requiring stable component supply, long-term lifecycle support, and ECOPACK2-compliant packaging.
Supply support for M24256E-FMC6TG 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 microcontrollers, power ICs, sensors, and memory solutions for industrial, automotive, and consumer markets.
The M24256E-F series belongs to ST's serial EEPROM product line, engineered specifically for robust, low-power, and secure nonvolatile storage in space-constrained embedded systems requiring extended data retention and field-programmable configuration.
FAQ
What is the function of the WC pin on the M24256E-FMC6TG?
The WC (Write Control) pin is an active-high hardware write protection input. When driven high, it disables all write operations - including main memory, configurable device address (CDA), and identification page writes - regardless of software lock status. This provides fail-safe protection during power-up/down transients or system faults, and is distinct from the software-based DAL bit lock in the CDA register.
Can the identification page be reprogrammed after being locked?
No. Once the identification page is locked to read-only mode (via the identification page lock instruction), the lock is permanent and irreversible. Subsequent write attempts to that page result in NO ACK responses. The lock mechanism is implemented in hardware and cannot be undone, ensuring cryptographic key or serial number integrity throughout the device's operational life.
How does the configurable device address (CDA) register work?
The CDA register is an 8-bit on-die register where bits b3–b1 (C2–C0) define three LSBs of the I²C device address, enabling up to eight unique addresses on the same bus. Bit b0 (DAL) permanently locks the register when set to 1 - an irreversible action. Factory-default CDA is 000; preprogrammed variants (e.g., M24256E-Fxx6T4) ship with DAL = 1 and C2–C0 preset per Table 4.
Is the M24256E-FMC6TG compatible with 1.8 V I²C buses?
Yes. The M24256E-FMC6TG operates from 1.6 V to 5.5 V and fully supports I²C Fast-mode Plus (1 MHz) at 1.8 V, provided VCC remains within specification and external pull-up resistors are sized per Figure 21/22 in DS12687. Its 310 nA standby current and 5 μs wake-up make it especially suited for 1.8 V battery-backed systems requiring minimal quiescent power.
M24256E-FMC6TG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-UFDFN Exposed Pad
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Programmable:
- -
- 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:
- 1.6V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-UFDFPN (2x3)
M24256E-FMC6TG FAQ
1.How can I place an order for M24256E-FMC6TG through Aetrix?
Please submit a Request for Quotation (RFQ) for M24256E-FMC6TG 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 M24256E-FMC6TG reliable?
The price and inventory of M24256E-FMC6TG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M24256E-FMC6TG is usually 5 days.
3.What payment methods are accepted for M24256E-FMC6TG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M24256E-FMC6TG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M24256E-FMC6TG?
M24256E-FMC6TG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M24256E-FMC6TG 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 M24256E-FMC6TG?
For technical support, including M24256E-FMC6TG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M24256E-FMC6TG requirements.
6.How does Aetrix verify that M24256E-FMC6TG is sourced from the original manufacturer or authorized distributors?
All M24256E-FMC6TG 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 M24256E-FMC6TG meets industry standards.
7.What is the process for return or replacement of M24256E-FMC6TG?
All M24256E-FMC6TG units undergo pre-shipment inspection (PSI). If there is an issue with M24256E-FMC6TG, 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 M24256E-FMC6TG part is unused and in its original packaging.
Return procedure for M24256E-FMC6TG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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