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STMicroelectronics M95256-DRMF3TG/K
- Part No.:
- M95256-DRMF3TG/K
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
M95256-DRMF3TG/K.pdf
- Description:
- IC EEPROM 256KBIT SPI 20MHZ 8MLP
- Quantity:
- Payment:
- Shipping:
Inventory:8,169
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Product details
Overview
M95256-DRMF3TG/K from STMicroelectronics is an AEC-Q100 Grade 0 qualified 256-Kbit SPI serial EEPROM designed for automotive powertrain and body control modules. It delivers 32 Kbytes of byte-alterable memory organized in 512 × 64-byte pages, supports up to 20 MHz clock (at VCC ≥ 4.5 V), features embedded ECC logic for enhanced data integrity, and operates across -40 °C to +145 °C with VCC from 2.5 V to 5.5 V.
For engineers reviewing the M95256-DRMF3TG/K datasheet, M95256-DRMF3TG/K pinout, M95256-DRMF3TG/K application, or M95256-DRMF3TG/K equivalent, this device serves as a high-reliability nonvolatile storage solution for engine control unit calibration data, airbag deployment logs, and infotainment configuration parameters under extended temperature and voltage stress.
Technical Context
This EEPROM implements a true SPI interface compliant with CPOL=0/CPHA=0 and CPOL=1/CPHA=1 modes, with input latching on rising clock edge and output valid on falling edge. It integrates a dedicated Status Register with WIP, WEL, BP1/BP0, and SRWD bits for real-time write state monitoring and configurable block-level write protection (1/4, 1/2, or full memory).
The device includes a lockable 64-byte Identification Page for storing immutable device IDs or safety-critical configuration values, plus Schmitt-trigger inputs for robust noise immunity on all control pins. Its internal ECC logic corrects single-bit errors per 4-byte group, improving long-term data retention reliability in harsh automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 Kbit (32 Kbyte), organized as 512 pages × 64 bytes - enables efficient firmware parameter storage with page-aligned writes. |
| Max clock frequency | 20 MHz at VCC ≥ 4.5 V - supports fast boot-time configuration loading in ECU applications. |
| Write endurance | 4 million cycles at 25 °C; 400 k cycles at 145 °C - ensures reliable field recalibration over full automotive lifetime. |
| Data retention | 50 years at 125 °C; 100 years at 25 °C - guarantees persistent storage of safety-critical calibration data without refresh. |
| Operating temperature | -40 °C to +145 °C - certified for under-hood engine control and transmission control unit deployment. |
| Supply voltage range | 2.5 V to 5.5 V - compatible with 3.3 V and 5 V automotive microcontroller I/O domains without level shifting. |
| ESD protection | 4000 V HBM - withstands handling and system-level electrostatic discharge in manufacturing and service environments. |
Pinout & Package
Package: WFDFPN8 (2 mm × 3 mm, 0.5 mm pitch, RoHS-compliant ECOPACK2®). Pinout validated per STMicroelectronics DS8896 Rev 9 Figure 2 and Table 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| S | Chip Select | Active-low enable signal; edge- and level-sensitive for protocol safety - prevents spurious writes during power-up or bus noise. |
| C | Serial Clock | Synchronizes all SPI transfers; rising edge latches input (D), falling edge outputs data (Q) - supports standard MCU SPI peripherals. |
| D | Serial Data Input | Carries instructions, addresses, and write data; MSB-first format - enables compact command framing with minimal overhead. |
| Q | Serial Data Output | Provides read data and status register contents; high-impedance when deselected - allows multi-device SPI bus sharing. |
| W | Write Protect | Hardware-controlled lock for Status Register writes when SRWD = 1 - adds physical layer security against accidental reconfiguration. |
| HOLD | Hold Control | Pauses ongoing SPI transaction without deselecting device - preserves clock phase and address pointer during interrupt servicing. |
| VCC | Supply Voltage | 2.5–5.5 V operation with defined power-up sequencing - eliminates need for external reset supervisors in most designs. |
| VSS | Ground Reference | Common return for all signals and internal logic - requires low-inductance layout to maintain noise immunity at 20 MHz. |
Key Features
| Feature | Design Value |
|---|---|
| Embedded ECC logic | Single-bit error correction per 4-byte group - improves data integrity without software overhead in safety-critical logging. |
| Lockable Identification Page | 64-byte dedicated area with LID instruction - enables permanent storage of unique device ID or cryptographic keys post-manufacturing. |
| Configurable block protection | BP1/BP0 bits define 1/4, 1/2, or full memory write lock - supports hierarchical firmware update schemes with protected bootloader regions. |
| Schmitt-trigger inputs | On S, C, D, HOLD, W pins - rejects <100 ns noise pulses and ensures reliable operation in high-EMI engine compartments. |
| Fast write cycle | ≤4 ms for byte or page write - reduces firmware update latency and enables real-time parameter adjustment in ADAS systems. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
|
Use Scenario: Storing and updating fuel injection timing maps and knock sensor calibration coefficients during vehicle operation. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with guaranteed 145 °C operation and 400 k write cycles at temperature. Use Value: Enables field recalibration without hardware replacement, reducing warranty costs and supporting OTA updates. |
Use Scenario: Logging radar sensor fusion parameters and camera alignment offsets after factory calibration and service events. IC Role / Device Role / Timing Role: Secure, ECC-protected storage for safety-critical configuration data with lockable ID page. Use Value: Ensures deterministic behavior across vehicle lifecycle by preventing corruption of sensor calibration metadata. |
| Electric Power Steering (EPS) | Body Control Module (BCM) |
|
Use Scenario: Retaining torque assist profiles and motor position zero-point offsets across ignition cycles and battery disconnects. IC Role / Device Role / Timing Role: High-endurance EEPROM interfaced directly to EPS MCU via SPI, operating at 125 °C ambient. Use Value: Eliminates mechanical zeroing procedures during service, improving repair efficiency and customer satisfaction. |
Use Scenario: Storing user preferences (window positions, mirror angles, lighting themes) and door module diagnostic history. IC Role / Device Role / Timing Role: Low-power, 3.3 V-compatible serial EEPROM with 50-year data retention at 125 °C. Use Value: Delivers consistent personalization experience over 15+ year vehicle lifespan 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 |
|---|---|---|---|
| AT25DF256A-SSH-T | 3 V-only supply (2.7–3.6 V); no AEC-Q100 qualification; 85 °C max operating temp | Targeted at industrial/commercial systems, not automotive under-hood use | Select only for cost-sensitive non-automotive designs where extended temperature and qualification are unnecessary. |
| BR25H256FJ-WE2 | AEC-Q100 Grade 1 (−40 °C to +125 °C); 10 MHz max clock; no Identification Page or ECC | Limited to cabin electronics or less demanding powertrain subsystems | Choose when Grade 0 and 145 °C operation are not required, and ECC/ID page features are unused. |
Compared with AT25DF256A-SSH-T and BR25H256FJ-WE2, the M95256-DRMF3TG/K uniquely combines AEC-Q100 Grade 0 certification, 145 °C operation, embedded ECC, and a lockable Identification Page - making it the only option qualified for safety-critical engine and transmission control storage.
Availability
M95256-DRMF3TG/K is available at Aetrix Electronics and suitable for automotive powertrain control, ADAS sensor calibration, electric power steering, and body control module applications requiring stable component supply across extended temperature and voltage ranges.
Supply support for M95256-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 broad portfolio coverage from microcontrollers to analog and memory devices.
The M95256-DRMF3TG/K belongs to ST's automotive-grade serial EEPROM product line, engineered specifically for mission-critical nonvolatile storage in engine control, transmission, and safety systems where AEC-Q100 Grade 0 reliability is mandatory.
FAQ
What is the package type and footprint compatibility of M95256-DRMF3TG/K?
M95256-DRMF3TG/K uses the WFDFPN8 package: 2 mm × 3 mm body, 0.5 mm pitch, 8-pin dual-flat no-lead. It matches JEDEC MO-229 standard MLP8 outlines and is compatible with standard reflow profiles for lead-free assembly. Recommended PCB footprint dimensions are specified in ST document DS8896 Rev 9, Table 18 and Figure 24.
How does the Identification Page differ from main memory, and how is it locked?
The Identification Page is a dedicated 64-byte region accessible via RDID/WRID instructions. Unlike main memory, it supports permanent locking via the LID instruction, which sets a one-time-programmable flag preventing further writes. Once locked, the page becomes read-only for life, ensuring immutability of stored device IDs or cryptographic keys.
Can M95256-DRMF3TG/K operate reliably at 20 MHz across its full temperature range?
No - 20 MHz operation is guaranteed only at VCC ≥ 4.5 V and temperatures ≤ 125 °C. At 145 °C, maximum clock frequency drops to 10 MHz (VCC ≥ 2.5 V) per DS8896 Rev 9 Table 12. This derating ensures timing margin for setup/hold compliance under worst-case process-voltage-temperature corners.
What write protection mechanisms are available, and how are they configured?
M95256-DRMF3TG/K offers three layered protections: (1) Hardware W pin + SRWD bit for Status Register lock, (2) BP1/BP0 bits for 1/4, 1/2, or full memory block protection, and (3) Identification Page lock via LID instruction. All are nonvolatile and persist through power cycles; BP1/BP0 and SRWD are written via WRSR instruction after enabling WEL.
M95256-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:
- SPI
- Clock Frequency:
- 20 MHz
- Write Cycle Time - Word, Page:
- 4ms
- Access Time:
- -
- 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)
M95256-DRMF3TG/K FAQ
1.How can I place an order for M95256-DRMF3TG/K through Aetrix?
Please submit a Request for Quotation (RFQ) for M95256-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 M95256-DRMF3TG/K reliable?
The price and inventory of M95256-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 M95256-DRMF3TG/K is usually 5 days.
3.What payment methods are accepted for M95256-DRMF3TG/K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M95256-DRMF3TG/K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M95256-DRMF3TG/K?
M95256-DRMF3TG/K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M95256-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 M95256-DRMF3TG/K?
For technical support, including M95256-DRMF3TG/K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M95256-DRMF3TG/K requirements.
6.How does Aetrix verify that M95256-DRMF3TG/K is sourced from the original manufacturer or authorized distributors?
All M95256-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 M95256-DRMF3TG/K meets industry standards.
7.What is the process for return or replacement of M95256-DRMF3TG/K?
All M95256-DRMF3TG/K units undergo pre-shipment inspection (PSI). If there is an issue with M95256-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 M95256-DRMF3TG/K part is unused and in its original packaging.
Return procedure for M95256-DRMF3TG/K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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