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STMicroelectronics M24256-DRMF3TG/K
- Part No.:
- M24256-DRMF3TG/K
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
M24256-DRMF3TG/K.pdf
- Description:
- IC EEPROM 256KBIT I2C 1MHZ 8MLP
- Quantity:
- Payment:
- Shipping:
Inventory:5,226
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Product details
Overview
M24256-DRMF3TG/K from STMicroelectronics is an AEC-Q100 Grade 1 automotive serial EEPROM delivering 256 Kbit (32 Kbyte) nonvolatile storage via I²C interface with 1 MHz max clock, 64-byte page size, and extended operation from –40 °C to 125 °C at 1.7–5.5 V. It integrates embedded ECC logic for enhanced data integrity and includes a dedicated 64-byte lockable Identification Page for device ID and application parameters in vehicle control modules.
For engineers reviewing the M24256-DRMF3TG/K datasheet, M24256-DRMF3TG/K pinout, M24256-DRMF3TG/K application, or M24256-DRMF3TG/K equivalent, key selection criteria include automotive temperature compliance, I²C bus speed support up to 1 MHz, write endurance at 125 °C, identification page locking capability, and TSSOP8 package compatibility with board-level noise immunity requirements.
Technical Context
The device operates as a slave on the I²C bus using standard Start/Stop conditions and 7-bit device addressing with three Chip Enable inputs (E2/E1/E0) enabling up to eight devices on one bus. Device select codes differ for main memory (1010b) and Identification Page (1011b), both supporting R/W bit control.
Internal architecture includes a 512-page × 64-byte memory array with automatic address incrementing post-write, Schmitt-triggered SCL/SDA inputs for noise rejection, and hardware-based Write Control (WC) pin that globally inhibits all writes when high. The Identification Page supports read, write, and permanent lock operations independent of main array access.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory capacity | 256 Kbit (32 Kbyte) organized as 512 pages × 64 bytes - enables efficient block-level firmware parameter storage with minimal bus overhead. |
| I²C clock frequency | Up to 1 MHz - supports high-speed configuration updates in real-time automotive subsystems without timing bottlenecks. |
| Operating temperature | –40 °C to +125 °C - qualified per AEC-Q100 Grade 1 for under-hood and powertrain ECU deployment. |
| Supply voltage range | 1.7 V to 5.5 V - compatible with 3.3 V and 5 V microcontroller I/O domains and brown-out tolerant across battery transients. |
| Write endurance @125°C | 600 k cycles - ensures reliable calibration data logging over full vehicle lifetime in high-temperature environments. |
| Data retention @125°C | 50 years - guarantees persistent storage of safety-critical configuration data without refresh in hot zones. |
| ESD protection | 4000 V HBM - provides robustness against assembly handling and in-vehicle electrostatic discharge events. |
Pinout & Package
Package: RoHS-compliant and halogen-free TSSOP8 (DW), 3 × 4.4 mm body, 0.65 mm pitch, 8-lead thin shrink small outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (E2) | Chip Enable input | Part of 3-bit hardware address (E2/E1/E0); sets LSBs of 7-bit I²C device address - allows up to 8 devices on same bus without software address conflict. |
| 2 (E1) | Chip Enable input | Second bit of hardware address; tied high/low to configure unique I²C slave address - eliminates need for external address jumpers in multi-EEPROM systems. |
| 3 (E0) | Chip Enable input | Third bit of hardware address; floating defaults to low - simplifies layout by permitting unconnected pins for default addressing. |
| 4 (VSS) | Ground reference | System ground return path for internal charge pump and I/O buffers - must be low-impedance to maintain noise margin during fast I²C transitions. |
| 5 (SCL) | Serial Clock input | Master-generated clock strobe with Schmitt trigger - rejects sub-50 ns noise spikes common in automotive harness environments. |
| 6 (SDA) | Serial Data I/O | Open-drain bidirectional line requiring external pull-up; supports wire-OR with other I²C devices - enables shared bus topology with sensors and MCUs. |
| 7 (WC) | Write Control input | Hardware write protect: high = full memory lock, low/floating = write enabled - prevents accidental corruption during power-up/down or firmware update sequences. |
| 8 (VCC) | Supply voltage | 1.7–5.5 V operating range powers internal high-voltage generator for EEPROM programming - eliminates need for external VPP supply. |
Key Features
| Feature | Design Value |
|---|---|
| Embedded ECC logic | Corrects single-bit errors and detects double-bit errors in real time - eliminates need for external error-checking firmware in ASIL-B systems. |
| Lockable Identification Page | 64-byte dedicated area with permanent read-only lock after programming - secures ST device ID and OEM-specific calibration constants against field overwrite. |
| Short write cycle time | ≤4 ms for byte or page writes - enables rapid parameter updates during engine start-up or diagnostic mode without blocking MCU execution. |
| Extended voltage range | 1.7–5.5 V operation - supports direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifters in mixed-voltage ECUs. |
| Automotive qualification | AEC-Q100 Grade 1 certified - meets stress test requirements for temperature cycling, humidity, and mechanical shock in production vehicles. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
|
Use Scenario: Storing adaptive fuel trim values, misfire counters, and OBD-II diagnostic trouble codes across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed retention at 125 °C near exhaust manifolds and real-time write capability during active engine control loops. Use Value: Enables regulatory-compliant emissions learning without external backup power or supercapacitors, reducing BOM cost and board space. |
Use Scenario: Retaining camera calibration offsets, radar sensor alignment data, and lane-departure warning thresholds after vehicle shutdown. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration storage with lockable Identification Page to prevent unauthorized modification of safety-critical ADAS parameters. Use Value: Meets ISO 26262 ASIL-B data integrity requirements through embedded ECC and hardware write protection, eliminating need for redundant checksum validation. |
| Body Control Module (BCM) | Electric Power Steering (EPS) |
|
Use Scenario: Saving user preferences (mirror position, seat settings, lighting profiles) and door/window auto-reverse calibration points. IC Role / Device Role / Timing Role: High-endurance EEPROM supporting >100,000 write cycles for frequent user interaction events while maintaining 100-year data retention at cabin temperatures. Use Value: Eliminates mechanical potentiometers and reduces MCU firmware complexity by offloading persistent state management to dedicated hardware. |
Use Scenario: Recording motor phase current offsets, torque sensor zero-point drift compensation, and fault history logs for steering assist calibration. IC Role / Device Role / Timing Role: Automotive-grade nonvolatile memory operating continuously at 105–125 °C near EPS motor housing with guaranteed 600 k write cycles. Use Value: Ensures precise steering feel and safety compliance over full vehicle life without recalibration visits, even under thermal stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24CSW-EEPROM-T | 256 Kbit I²C EEPROM, AEC-Q100 Grade 2 (–40 °C to 105 °C), no Identification Page, 100 k write cycles @105 °C | Limited to under-dash modules; lacks lockable ID page and ECC | Select only for cost-sensitive non-safety applications where 125 °C operation and secure ID storage are unnecessary. |
| BR24G256FJ-3GE2 | 256 Kbit I²C EEPROM, AEC-Q100 Grade 1, 1 MHz capable, but no embedded ECC and no dedicated ID page | Requires external CRC validation; no hardware-based parameter lockdown capability | Choose when footprint compatibility with SOP-8 is required and ECC is implemented in host firmware. |
Compared with AT24CSW-EEPROM-T and BR24G256FJ-3GE2, the M24256-DRMF3TG/K uniquely combines Grade 1 temperature rating, embedded ECC, and a lockable Identification Page - making it the only option qualified for ASIL-B–compliant powertrain and ADAS calibration storage without host-side error mitigation.
Availability
M24256-DRMF3TG/K is available at Aetrix Electronics and suitable for engine control units, ADAS domain controllers, body control modules, and electric power steering systems requiring stable component supply across automotive production lifecycles.
Supply support for M24256-DRMF3TG/K 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 specializing in automotive, industrial, and power management solutions, with over 40 years of microelectronics innovation and manufacturing excellence.
The M24256-A125 belongs to ST's automotive-qualified serial EEPROM product line, designed specifically for reliable nonvolatile data storage in harsh-temperature vehicle subsystems where functional safety and long-term data integrity are mandatory.
FAQ
What is the function of the WC pin on the M24256-DRMF3TG/K?
The WC (Write Control) pin is a hardware-level write protect input. When driven high, it disables all write operations to both the main memory array and the Identification Page - preventing accidental overwrites during power transitions or firmware updates. When low or floating, writes are enabled. This pin operates independently of software commands and requires no initialization sequence.
Does the M24256-DRMF3TG/K support standard I²C addressing modes?
Yes, it supports standard 7-bit I²C addressing with configurable device select code via E2/E1/E0 pins. It recognizes two base addresses: 1010b for main memory access and 1011b for Identification Page access. Each supports R/W bit control, enabling up to eight devices on one bus with distinct 3-bit hardware addresses.
How does the embedded ECC logic operate in the M24256-DRMF3TG/K?
The ECC logic automatically computes and stores Hamming-code parity bits alongside each byte written to memory. On read, it validates data and corrects single-bit errors transparently - no host intervention or additional read cycles required. Detection of uncorrectable double-bit errors triggers a NACK response, alerting the host to potential memory degradation.
Can the Identification Page be rewritten after being locked?
No. Once the Identification Page is locked via the Lock Identification Page instruction, the entire 64-byte page becomes permanently read-only. The lock is irreversible and enforced by internal fuse-like circuitry - not software flags - ensuring cryptographic-grade immutability of stored device ID and calibrated parameters.
M24256-DRMF3TG/K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-WFDFN 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:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MLP (2x3)
M24256-DRMF3TG/K FAQ
1.How can I place an order for M24256-DRMF3TG/K through Aetrix?
Please submit a Request for Quotation (RFQ) for M24256-DRMF3TG/K 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-DRMF3TG/K reliable?
The price and inventory of M24256-DRMF3TG/K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M24256-DRMF3TG/K is usually 5 days.
3.What payment methods are accepted for M24256-DRMF3TG/K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M24256-DRMF3TG/K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M24256-DRMF3TG/K?
M24256-DRMF3TG/K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M24256-DRMF3TG/K 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-DRMF3TG/K?
For technical support, including M24256-DRMF3TG/K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M24256-DRMF3TG/K requirements.
6.How does Aetrix verify that M24256-DRMF3TG/K is sourced from the original manufacturer or authorized distributors?
All M24256-DRMF3TG/K 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-DRMF3TG/K meets industry standards.
7.What is the process for return or replacement of M24256-DRMF3TG/K?
All M24256-DRMF3TG/K units undergo pre-shipment inspection (PSI). If there is an issue with M24256-DRMF3TG/K, 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-DRMF3TG/K part is unused and in its original packaging.
Return procedure for M24256-DRMF3TG/K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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