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STMicroelectronics M24256-BFMB6TG
- Part No.:
- M24256-BFMB6TG
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
M24256-BFMB6TG.pdf
- Description:
- IC EEPROM 256KBIT I2C 8UFDFPN
- Quantity:
- Payment:
- Shipping:
Inventory:4,084
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Product details
Overview
M24256-BFMB6TG from STMicroelectronics is a 256-Kbit I²C-compatible serial EEPROM organized as 32 K × 8 bits, operating from 1.7 V to 5.5 V with 1 MHz clock support. It features 64-byte page write, hardware write protection via WC pin, and enhanced ESD/latch-up immunity. Used in industrial control modules for parameter storage and calibration data retention.
For engineers reviewing the M24256-BFMB6TG datasheet, M24256-BFMB6TG pinout, M24256-BFMB6TG application, or M24256-BFMB6TG equivalent, key selection criteria include supply voltage range (1.7–5.5 V), I²C clock compatibility (100 kHz/400 kHz/1 MHz), page size (64 bytes), write endurance (>4 million cycles), and package-specific pin mapping for TSSOP8.
Technical Context
The device implements a slave-only I²C interface with start/stop detection, ACK/NACK handshaking, and internal address auto-increment. Its memory array includes ECC logic applied per 4-byte group to correct single-bit read errors without protocol visibility.
Chip enable (E0–E2) sets the 3 LSBs of the 7-bit device address (1010xxxR/W or 1011xxxR/W for ID page), while WC pin enables hardware-level full-array write lock. Internal HV generator and sequencer manage erase/write cycles independently of host timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 Kbit (32 Kbyte), organized as 32 K × 8 bits - defines maximum nonvolatile storage capacity for configuration data |
| I²C clock frequency | Up to 1 MHz - supports high-speed firmware updates and real-time parameter writes in bandwidth-constrained systems |
| Supply voltage range | 1.7 V to 5.5 V - enables direct interfacing with 1.8 V, 2.5 V, 3.3 V, and 5 V microcontrollers without level shifters |
| Page write size | 64 bytes - minimizes I²C transaction count when updating contiguous configuration blocks |
| Write cycle time | ≤5 ms per byte or page - determines minimum interval between successive write commands in time-critical logging |
| Data retention | 200 years at +25 °C - ensures long-term validity of stored calibration coefficients across product lifecycle |
| Endurance | 4 million write cycles - supports frequent field-updatable parameters in industrial HMI or sensor nodes |
| Operating temperature | −40 °C to +85 °C - qualifies for use in automotive under-hood ECUs and outdoor industrial gateways |
Pinout & Package
Package: TSSOP8 (DW), 169 mil width, RoHS-compliant and halogen-free (ECOPACK2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| E0, E1, E2 | Chip enable inputs | Set 3 LSBs of I²C device address (1010xxxR/W); floating = logic low - enables multi-device bus addressing |
| SDA | Serial data I/O | Open-drain bidirectional line requiring external pull-up; shares bus with other I²C slaves - defines shared communication channel |
| SCL | Serial clock input | Master-generated clock synchronizing all data transfers - determines maximum throughput and timing margin |
| WC | Write control input | Active-high hardware lock disabling all write operations to entire memory array - prevents accidental corruption during power transients |
| VCC | Supply voltage | 1.7–5.5 V DC input powering internal charge pump and logic - requires local 10–100 nF decoupling |
| VSS | Ground reference | Return path for VCC and I/O signals - must be low-impedance connection to avoid noise coupling into SDA/SCL |
Key Features
| Feature | Design Value |
|---|---|
| Multi-voltage I²C interface | Operates at 1.7–5.5 V with 1 MHz clock - eliminates level-shifter components in mixed-voltage systems |
| Hardware write protection | Dedicated WC pin disables all writes when driven high - provides fail-safe memory lock independent of firmware state |
| ECC per 4-byte group | Single-bit error correction on read - improves reliability of stored calibration data without software overhead |
| Identification page (M24256-D variant) | 64-byte dedicated page permanently lockable in read-only mode - secures device-specific keys or factory settings |
| Enhanced robustness | ESD >4 kV HBM, latch-up immune per JESD78 - sustains harsh industrial environments with noisy power rails |
Applications
| Industrial PLC Configuration Storage | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Storing I/O mapping tables and user-defined logic configurations in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed 200-year data retention and 4M-cycle endurance for field reprogramming. Use Value: Eliminates need for battery-backed SRAM; enables zero-maintenance operation over 15+ year equipment lifespan. |
Use Scenario: Holding door lock actuator calibration offsets and seat position presets in BCM subsystems. IC Role / Device Role / Timing Role: I²C-connected EEPROM providing secure, low-power storage accessible during vehicle sleep modes. Use Value: Supports ASIL-B relevant data integrity via ECC and hardware write lock (WC pin) against voltage glitch-induced corruption. |
| Medical Infusion Pump Calibration | Smart Energy Meter Firmware Parameters |
|
Use Scenario: Retaining flow rate calibration coefficients and safety limit thresholds updated during service calibration. IC Role / Device Role / Timing Role: Tamper-resistant storage with permanent ID page locking capability for regulatory audit trails. Use Value: Meets IEC 62304 Class C software requirements through deterministic write timing (≤5 ms) and ECC-protected reads. |
Use Scenario: Storing tariff schedules, metering constants, and cryptographic keys in utility-grade smart meters. IC Role / Device Role / Timing Role: Secure, long-life memory with ECOPACK2 compliance and −40 °C to +85 °C operation for outdoor deployment. Use Value: Enables 20+ year field deployment without memory refresh; WC pin prevents unauthorized firmware parameter modification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C256-SSHL-T (Microchip) | 256 Kbit, 1.7–5.5 V, 1 MHz I²C, but no WC pin or ECC; only 1 million write cycles | Lacks hardware write lock and ECC - requires firmware-level protection and error checking | Select when cost sensitivity outweighs need for hardware-level write security and ECC |
| BR24G256FJ-3GE2 (ROHM) | 256 Kbit, 1.7–5.5 V, 1 MHz I²C, includes WC pin but no identification page or ECC | Supports hardware write lock but lacks dedicated ID page for secure key storage | Prefer when full-array lock suffices and ID page functionality is unnecessary |
Compared with AT24C256 and BR24G256FJ, M24256-BFMB6TG uniquely combines hardware write lock (WC), ECC per 4-byte group, and optional identification page - delivering higher data integrity assurance for safety-critical or long-lifecycle deployments.
Availability
M24256-BFMB6TG is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply across extended production lifecycles.
Supply support for M24256-BFMB6TG 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 belongs to ST's serial EEPROM product line, engineered for high-reliability, low-power, and long-data-retention applications in harsh environments where firmware update resilience and parameter integrity are critical.
FAQ
What is the function of the WC pin on M24256-BFMB6TG?
The WC (Write Control) pin is an active-high hardware lock that disables all write operations to the entire memory array when driven high. When WC is low or floating, writes are enabled. This feature prevents accidental memory corruption during power-up/down transients or system resets, and operates independently of firmware control - making it essential for safety-critical parameter storage.
Does M24256-BFMB6TG support 1 MHz I²C operation across its full voltage range?
Yes, M24256-BFMB6TG supports 1 MHz I²C clock frequency from 1.7 V to 5.5 V, as confirmed in DS1766 Rev 35 Section 1. This full-range high-speed capability eliminates the need for clock throttling in mixed-voltage designs and enables faster firmware updates compared to legacy 400 kHz EEPROMs.
How does the ECC feature operate, and what does it protect against?
ECC operates transparently on each 4-byte memory group, detecting and correcting single-bit errors during read operations. It does not require host intervention or additional software. This protects against bit flips caused by radiation, aging, or marginal read voltages - ensuring reliable retrieval of calibration data or configuration parameters without CRC overhead or retry logic.
Is the M24256-BFMB6TG pinout compatible with standard TSSOP8 EEPROMs?
Yes, M24256-BFMB6TG uses the industry-standard 8-pin TSSOP8 footprint (169 mil width) with identical pin assignments: Pin 1=E0, Pin 2=VSS, Pin 3=SCL, Pin 4=WC, Pin 5=E1, Pin 6=E0, Pin 7=VCC, Pin 8=E2 - matching JEDEC MO-153. This allows drop-in replacement in existing layouts designed for compatible I²C EEPROMs.
M24256-BFMB6TG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-BFMB6TG FAQ
1.How can I place an order for M24256-BFMB6TG through Aetrix?
Please submit a Request for Quotation (RFQ) for M24256-BFMB6TG 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-BFMB6TG reliable?
The price and inventory of M24256-BFMB6TG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M24256-BFMB6TG is usually 5 days.
3.What payment methods are accepted for M24256-BFMB6TG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M24256-BFMB6TG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M24256-BFMB6TG?
M24256-BFMB6TG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M24256-BFMB6TG 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-BFMB6TG?
For technical support, including M24256-BFMB6TG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M24256-BFMB6TG requirements.
6.How does Aetrix verify that M24256-BFMB6TG is sourced from the original manufacturer or authorized distributors?
All M24256-BFMB6TG 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-BFMB6TG meets industry standards.
7.What is the process for return or replacement of M24256-BFMB6TG?
All M24256-BFMB6TG units undergo pre-shipment inspection (PSI). If there is an issue with M24256-BFMB6TG, 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-BFMB6TG part is unused and in its original packaging.
Return procedure for M24256-BFMB6TG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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