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STMicroelectronics M95040-DRMF3TG/K
- Part No.:
- M95040-DRMF3TG/K
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
M95040-DRMF3TG/K.pdf
- Description:
- IC EEPROM 4KBIT SPI 20MHZ 8MLP
- Quantity:
- Payment:
- Shipping:
Inventory:4,506
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Product details
Overview
M95040-DRMF3TG/K from STMicroelectronics is an AEC-Q100 Grade 0 qualified 4-Kbit serial SPI EEPROM designed for automotive powertrain and body control modules requiring nonvolatile memory with extended temperature operation up to +145 °C. It delivers 20 MHz SPI clock speed at VCC ≥ 4.5 V, supports 16-byte page writes within 4 ms, and features block-level write protection (¼/½/whole memory) plus a dedicated 16-byte identification page with permanent lock capability.
For engineers reviewing the M95040-DRMF3TG/K datasheet, M95040-DRMF3TG/K pinout, M95040-DRMF3TG/K application, or M95040-DRMF3TG/K equivalent, key selection criteria include high-temp endurance (400k cycles at 145 °C), Schmitt-trigger noise immunity, ECOPACK2-compliant DFN8 package (2 × 3 mm), and status register-controlled BP0/BP1 protection logic.
Technical Context
This device implements a byte-alterable 512 × 8-bit memory array organized into 32 pages of 16 bytes each, with embedded ECC logic enhancing data integrity during read/write operations. The SPI interface operates in CPOL=0/CPHA=0 or CPOL=1/CPHA=1 modes, latching input on rising clock edge and outputting data on falling edge.
It integrates a dedicated 16-byte identification page containing factory-programmed ST device codes (0x20, 0x00, 0x09) and user-configurable fields, all lockable to read-only mode via LID instruction. Write enable latch (WEL) and write-in-progress (WIP) bits in the status register provide deterministic command sequencing and real-time busy-state visibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4-Kbit (512 bytes), organized as 32 × 16-byte pages - enables efficient firmware parameter storage with minimal address overhead |
| SPI clock frequency | 20 MHz at VCC ≥ 4.5 V - supports fast configuration loading in engine control units without timing bottlenecks |
| Operating temperature | −40 °C to +145 °C (Grade 0) - certified for under-hood automotive applications including transmission control and exhaust aftertreatment systems |
| Write endurance | 400 k cycles at 145 °C - ensures reliable calibration data logging over full vehicle lifetime in high-heat environments |
| Data retention | 50 years at 125 °C - guarantees long-term integrity of safety-critical configuration parameters without refresh |
| Write protection | BP0/BP1 bits control ¼/½/whole memory lock - allows selective protection of boot code vs. runtime variables in ECU firmware partitions |
| Package | WFDFPN8 (2 × 3 mm, ECOPACK2) - provides compact footprint and thermal performance suitable for space-constrained automotive PCBs |
Pinout & Package
WFDFPN8 (2 × 3 mm) package with exposed thermal pad; 8-pin layout optimized for high-density automotive PCB routing and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (D) | Serial data input | Latches instruction, address, and write data on rising edge of C - must be driven cleanly to avoid command corruption |
| 2 (Q) | Serial data output | Drives read data on falling edge of C; high-Z when deselected - enables bus sharing with other SPI peripherals |
| 3 (W) | Write protect | Hardware-level lock for status register - prevents accidental WRSR execution during system power transitions |
| 4 (VSS) | Ground reference | Common return for all signals and VCC - requires low-inductance connection to minimize noise coupling into SPI lines |
| 5 (C) | Serial clock | Timing reference for all SPI transfers - polarity configurable (CPOL=0 or 1) to match host MCU peripheral settings |
| 6 (S) | Chip select | Edge- and level-sensitive enable - falling edge initiates command decode; high state forces Q to high-Z |
| 7 (HOLD) | Communication pause | Halts ongoing SPI transfer without resetting internal state - used for priority interrupt handling in real-time ECUs |
| 8 (VCC) | Supply voltage | 1.7–5.5 V operation - supports direct connection to 3.3 V or 5 V automotive domains without level-shifting |
Key Features
| Feature | Design Value |
|---|---|
| Embedded ECC logic | Corrects single-bit errors in memory array - eliminates need for external error-checking in safety-critical boot code storage |
| Schmitt trigger inputs | Input hysteresis on C, D, S, HOLD, W - rejects >1 ns glitches on noisy automotive harnesses without external RC filtering |
| Identification page | 16-byte factory-coded + user-writable area - stores unique device ID and calibrated sensor offsets, lockable permanently via LID instruction |
| Block write protection | BP0/BP1 bits define protected region (none/¼/½/whole) - isolates firmware update sections from runtime variable corruption |
| High-temp write endurance | 400 k cycles at 145 °C - exceeds ISO 26262 ASIL-B requirements for reprogrammable calibration memory in exhaust gas recirculation valves |
Applications
| Engine Control Unit (ECU) | Transmission Control Module (TCM) |
|---|---|
|
Use Scenario: Storing adaptive fuel trim tables and knock sensor calibration offsets updated during vehicle operation. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with real-time write capability and ECC-protected read integrity. Use Value: Enables closed-loop engine optimization across temperature gradients without risking data corruption during hot restarts. |
Use Scenario: Retaining gear ratio learning history and clutch wear compensation values across ignition cycles. IC Role / Device Role / Timing Role: High-reliability memory for mission-critical drivetrain adaptation data subject to frequent updates. Use Value: Maintains shift quality consistency over 15-year vehicle life by preserving learned behavior through 400k+ thermal cycles. |
| Exhaust Aftertreatment System | Body Control Module (BCM) |
|
Use Scenario: Logging diesel particulate filter (DPF) regeneration cycle counts and soot load estimates. IC Role / Device Role / Timing Role: High-temp endurance memory for cumulative operational metrics in 145 °C exhaust environments. Use Value: Ensures accurate DPF service scheduling even after prolonged exposure to under-hood thermal stress. |
Use Scenario: Storing door module configuration (mirror position, window auto-up/down settings) and theft deterrent keys. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for user preferences and cryptographic keys with hardware write-lock. Use Value: Prevents unauthorized modification of access credentials while enabling field-upgradable feature sets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25DF041A-MAHN-T | 4-Mbit density, no identification page, max 105 °C operation | Lacks AEC-Q100 Grade 0 qualification and 145 °C support | Acceptable for cabin electronics but unsuitable for powertrain or exhaust-mounted modules |
| BR24G04FJ-WE2 | 4-Kbit, I²C interface, −40 °C to +105 °C, no HOLD pin | Requires different MCU peripheral (I²C vs SPI), lower temp rating, no communication pause function | Valid for cost-sensitive body modules where SPI is unavailable and thermal stress is minimal |
Compared with AT25DF041A-MAHN-T and BR24G04FJ-WE2, M95040-DRMF3TG/K uniquely combines AEC-Q100 Grade 0, 145 °C operation, SPI HOLD functionality, and factory-identified memory - making it the only option for safety-critical, high-temperature automotive firmware parameter storage.
Availability
M95040-DRMF3TG/K is available at Aetrix Electronics and suitable for engine control units, transmission control modules, exhaust aftertreatment systems, and body control modules requiring stable component supply across automotive production lifecycles.
Supply support for M95040-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 headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with strong vertical integration in manufacturing and packaging.
M95040-DRMF3TG/K belongs to ST's automotive-grade serial EEPROM product line, engineered specifically for functional safety compliance and extended-temperature reliability in powertrain, chassis, and emissions control systems.
FAQ
What is the purpose of the HOLD pin on M95040-DRMF3TG/K?
The HOLD pin pauses active SPI communication without resetting internal state or losing command context. When asserted low while chip select is active and clock is low, it places Q in high-impedance and ignores D and C inputs. This allows microcontrollers to service higher-priority interrupts mid-transfer and resume seamlessly - critical for deterministic timing in ASIL-B automotive software stacks.
How does the identification page differ from standard memory pages?
The 16-byte identification page contains three factory-programmed bytes (0x20, 0x00, 0x09) identifying ST as manufacturer, SPI family, and 4-Kbit density. Unlike main memory, it supports WRID and RDID instructions, and can be permanently locked to read-only via LID - preventing overwrite of device identity while allowing secure storage of calibration constants or security keys.
Can M95040-DRMF3TG/K operate reliably at 5.5 V and 145 °C simultaneously?
Yes. The datasheet explicitly specifies 1.7–5.5 V operation up to 125 °C and 2.5–5.5 V operation up to 145 °C. At 5.5 V and 145 °C, write endurance remains rated at 400 k cycles and data retention at 50 years, validated per AEC-Q100 Grade 0 test conditions including high-temp operating life (HTOL) and temperature cycling.
What happens if the W pin is held low during a WRSR command?
If the W (write protect) pin is low during WRSR execution, the instruction is rejected and the status register remains unchanged. This hardware interlock prevents accidental modification of BP0/BP1 protection bits - ensuring that memory lock configuration cannot be altered during brown-out conditions or noise events on the W line, a key requirement for ISO 26262-compliant systems.
M95040-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:
- 4Kbit
- Memory Organization:
- 512 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)
M95040-DRMF3TG/K FAQ
1.How can I place an order for M95040-DRMF3TG/K through Aetrix?
Please submit a Request for Quotation (RFQ) for M95040-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 M95040-DRMF3TG/K reliable?
The price and inventory of M95040-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 M95040-DRMF3TG/K is usually 5 days.
3.What payment methods are accepted for M95040-DRMF3TG/K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M95040-DRMF3TG/K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M95040-DRMF3TG/K?
M95040-DRMF3TG/K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M95040-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 M95040-DRMF3TG/K?
For technical support, including M95040-DRMF3TG/K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M95040-DRMF3TG/K requirements.
6.How does Aetrix verify that M95040-DRMF3TG/K is sourced from the original manufacturer or authorized distributors?
All M95040-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 M95040-DRMF3TG/K meets industry standards.
7.What is the process for return or replacement of M95040-DRMF3TG/K?
All M95040-DRMF3TG/K units undergo pre-shipment inspection (PSI). If there is an issue with M95040-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 M95040-DRMF3TG/K part is unused and in its original packaging.
Return procedure for M95040-DRMF3TG/K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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