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STMicroelectronics M24256-DFMN6TP
- Part No.:
- M24256-DFMN6TP
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
M24256-DFMN6TP.pdf
- Description:
- IC EEPROM 256KBIT I2C 1MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:9,248
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Product details
Overview
M24256-DFMN6TP from STMicroelectronics is a 256-Kbit I²C-compatible EEPROM organized as 32 K × 8 bits, featuring 1.7 V to 5.5 V single-supply operation, 1 MHz max clock speed, 64-byte page write capability, and an additional lockable 64-byte identification page - deployed in industrial control modules for firmware parameter storage and device authentication.
For engineers reviewing the M24256-DFMN6TP datasheet, M24256-DFMN6TP pinout, M24256-DFMN6TP application, or M24256-DFMN6TP equivalent, key selection criteria include I²C bus timing compliance at 1 MHz, WC-controlled full-array write protection, E0–E2 hardware address configuration, and ECOPACK2-compliant TSSOP8 (DW) packaging with verified -40 °C to +85 °C operation.
Technical Context
The M24256-DFMN6TP implements a slave-only I²C interface with start/stop detection, ACK/NACK handshaking, and internal address counter auto-increment during sequential reads. It integrates on-chip HV generator and ECC logic across 4-byte groups to correct single-bit errors during read operations without protocol visibility.
Its memory architecture includes two distinct address spaces: standard 32 Kbyte array (device type ID 1010b) and a dedicated 64-byte identification page (device type ID 1011b), both accessible via same SDA/SCL lines but differentiated by MSB of device select code and A10 bit state for lock/write control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 Kbit (32 K × 8 bits) - supports firmware patch storage and calibration data logging in resource-constrained embedded systems. |
| I²C clock frequency | Up to 1 MHz - enables high-throughput parameter updates in real-time control loops without bus contention. |
| Supply voltage range | 1.7 V to 5.5 V - interoperable with 1.8 V logic domains and legacy 3.3 V/5 V microcontrollers without level-shifting. |
| Page size | 64 bytes - matches typical MCU cache line and bootloader sector boundaries for atomic firmware metadata writes. |
| Write cycle endurance | 4 million cycles - sufficient for >10 years of daily recalibration in industrial sensor nodes. |
| Data retention | 200 years at 25 °C - ensures long-term integrity of device serial numbers and cryptographic keys across product lifecycle. |
| Operating temperature | -40 °C to +85 °C - qualified for under-hood automotive ECUs and factory-floor PLCs without derating. |
| Identification page | 64-byte lockable region - stores immutable device identity; once locked, prevents overwrite while allowing unlimited reads. |
Pinout & Package
TSSOP8 (DW) package, 169 mil width, RoHS-compliant and halogen-free (ECOPACK2), pin 1 marked by notch or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| E2 | Chip enable (LSB) | Hardware-configurable device address bit; tied high/low to set b1 of 7-bit I²C address (1010 E2 E1 E0). |
| E1 | Chip enable (middle) | Hardware-configurable device address bit; enables up to 8 devices on same I²C bus without software address conflict. |
| E0 | Chip enable (MSB) | Hardware-configurable device address bit; floating defaults to low, ensuring deterministic boot-time address resolution. |
| SDA | Serial data I/O | Open-drain bidirectional line requiring external pull-up; supports wire-OR with other I²C slaves on shared bus. |
| SCL | Serial clock input | Master-generated clock; sampled on rising edge for data capture; tolerates 1 MHz with <10 ns rise time per spec. |
| WC | Write control | Active-high hardware lock: disables all write operations to entire memory array when driven high. |
| VCC | Supply voltage | 1.7–5.5 V DC input; requires local 10–100 nF decoupling capacitor adjacent to pin for noise immunity. |
| VSS | Ground reference | Return path for VCC; must be low-impedance connection to minimize ground bounce during write cycles. |
Key Features
| Feature | Design Value |
|---|---|
| ECOPACK2 packaging | RoHS-compliant, halogen-free TSSOP8 footprint compatible with standard reflow profiles and automated optical inspection. |
| Identification page locking | One-time permanent lock via dedicated instruction; prevents tampering of stored device IDs or security keys after provisioning. |
| ECC error correction | Single-bit correction per 4-byte group; transparent to host firmware and eliminates need for external CRC validation layers. |
| Write polling via ACK | Enables deterministic wait-state elimination: master detects write completion by repeated ACK polling instead of fixed tW delay. |
| Enhanced ESD/latch-up | ±4 kV HBM ESD rating and latch-up immunity per JESD78 - ensures robustness in handheld test equipment and field-deployed sensors. |
Applications
| Industrial Sensor Calibration | Automotive ECU Identity Storage |
|---|---|
|
Use Scenario: Storing temperature-compensated offset/gain coefficients during factory calibration of pressure sensors. IC Role / Device Role / Timing Role: Non-volatile parameter register accessed via I²C during power-up initialization sequence. Use Value: Enables field-replaceable sensor modules to retain calibrated values across power cycles and firmware updates without host MCU intervention. |
Use Scenario: Securing vehicle VIN, production date, and ECU serial number in Tier-1 automotive control units. IC Role / Device Role / Timing Role: Tamper-resistant identity vault; identification page locked post-manufacturing to prevent cloning. Use Value: Meets ISO/SAE 21434 cybersecurity requirements for immutable device identity in OTA update verification chains. |
| Smart Meter Firmware Metadata | Medical Device Configuration Lock |
|
Use Scenario: Recording firmware version, patch level, and cryptographic signature hash in utility-grade electricity meters. IC Role / Device Role / Timing Role: Secure metadata store updated only during authenticated firmware upgrades over isolated RS-485 link. Use Value: Supports regulatory audit trails by preserving immutable upgrade history with timestamped version identifiers. |
Use Scenario: Storing FDA-mandated device configuration parameters (e.g., dose limits, alarm thresholds) in infusion pumps. IC Role / Device Role / Timing Role: Write-protected configuration vault; WC pin tied high during normal operation to prevent accidental modification. Use Value: Ensures IEC 62304 compliance by guaranteeing configuration persistence across battery swaps and emergency resets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I²C EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C256-10PU-2.7 | 256 Kbit, 2.7–5.5 V supply, no identification page, 5 ms byte write only (no page write) | Lacks hardware address pins (E0–E2) and write-lockable ID page; limited to single-device I²C segments | Select when cost sensitivity outweighs need for multi-device addressing or secure identity storage. |
| BR24G256FJ-WE2 | 256 Kbit, 1.7–5.5 V, supports 1 MHz I²C, includes WP pin but no lockable ID page or ECC | Offers write protect but no one-time programmable identification region; ECC absent increases risk of silent data corruption | Prefer for consumer IoT where ECC and ID page are non-critical, and JEDEC-standard SOP8 footprint is required. |
Compared with AT24C256-10PU-2.7 and BR24G256FJ-WE2, the M24256-DFMN6TP uniquely delivers hardware-configurable addressing, ECC-protected reads, and a permanently lockable identification page - making it the only option meeting functional safety and cybersecurity requirements for medical and automotive deployments.
Availability
M24256-DFMN6TP is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive ECU identity storage, and smart meter firmware metadata management requiring stable component supply across extended product lifecycles.
Supply support for M24256-DFMN6TP 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.
The M24256 series belongs to ST's serial EEPROM product line, engineered specifically for secure, reliable, and low-power non-volatile data storage in safety-critical embedded systems with stringent longevity and tamper-resistance requirements.
FAQ
What is the function of the WC pin on M24256-DFMN6TP?
The WC (Write Control) pin is an active-high hardware lock that disables all write operations to the entire 32 Kbyte memory array when driven high. It does not affect read operations. When WC is low or floating, writes are enabled. This provides deterministic, glitch-immune protection against accidental overwrites during power transients or firmware faults.
How does the identification page differ from the main memory array?
The identification page is a dedicated 64-byte region accessible only via I²C device select code 1011b (vs. 1010b for main array). It supports write and lock instructions; once locked, it becomes read-only forever. Unlike the main array, its lock status is verified via a truncated command returning ACK/NoAck - enabling secure provisioning without exposing full memory access.
Can M24256-DFMN6TP operate reliably at 1.7 V and 1 MHz simultaneously?
Yes - the datasheet explicitly specifies 1 MHz maximum clock frequency across the full 1.7 V to 5.5 V VCC range. At 1.7 V, AC timing parameters (e.g., tSU:DAT, tHD:DAT) remain within specification, and internal charge pump ensures sufficient gate drive for EEPROM programming. No derating or reduced functionality applies at minimum supply.
Is ECC applied to the identification page as well as main memory?
No - ECC logic operates exclusively on the main 32 Kbyte memory array, correcting single-bit errors per 4-byte group. The identification page has no ECC protection; its integrity relies on one-time locking and external validation. This design prioritizes guaranteed immutability over error correction for identity-critical data.
M24256-DFMN6TP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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-SOIC
M24256-DFMN6TP FAQ
1.How can I place an order for M24256-DFMN6TP through Aetrix?
Please submit a Request for Quotation (RFQ) for M24256-DFMN6TP 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-DFMN6TP reliable?
The price and inventory of M24256-DFMN6TP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M24256-DFMN6TP is usually 5 days.
3.What payment methods are accepted for M24256-DFMN6TP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M24256-DFMN6TP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M24256-DFMN6TP?
M24256-DFMN6TP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M24256-DFMN6TP 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-DFMN6TP?
For technical support, including M24256-DFMN6TP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M24256-DFMN6TP requirements.
6.How does Aetrix verify that M24256-DFMN6TP is sourced from the original manufacturer or authorized distributors?
All M24256-DFMN6TP 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-DFMN6TP meets industry standards.
7.What is the process for return or replacement of M24256-DFMN6TP?
All M24256-DFMN6TP units undergo pre-shipment inspection (PSI). If there is an issue with M24256-DFMN6TP, 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-DFMN6TP part is unused and in its original packaging.
Return procedure for M24256-DFMN6TP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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