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Home > Products > Integrated Circuits (ICs) > Memory > Memory

STMicroelectronics M95256-DRMN8TP/K

Name: M95256-DRMN8TP/K
Brand: STMicroelectronics
SKU: M95256-DRMN8TP/K
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M95256-DRMN8TP/K

Manufacturer:: STMicroelectronics

Category:: Memory

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: M95256-DRMN8TP/K.pdf

Description:: IC EEPROM 256KBIT SPI 20MHZ 8SO

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Inventory:7,500

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Product details

Overview

M95256-DRMN8TP/K from STMicroelectronics is a 256-Kbit serial SPI EEPROM with 64-byte page architecture, rated for operation up to 105 °C and supporting 20 MHz clock at V_CC ≥ 4.5 V. It features embedded ECC logic, programmable block write protection (1/4, 1/2, or full memory), and a dedicated 64-byte lockable Identification Page for device ID and secure parameter storage - used in automotive body control modules requiring extended-temperature nonvolatile configuration storage.

For engineers reviewing the M95256-DRMN8TP/K datasheet, M95256-DRMN8TP/K pinout, M95256-DRMN8TP/K application, or M95256-DRMN8TP/K equivalent, key selection criteria include its AEC-Q100 Grade 2 qualification, 4 million write cycles at 25 °C, 50-year data retention at 105 °C, and support for dual SPI modes (CPOL=0/CPHA=0 and CPOL=1/CPHA=1) in constrained industrial and automotive environments.

Technical Context

The device implements a true EEPROM array organized as 32,768 × 8 bits across 512 pages, with Schmitt-trigger inputs for noise immunity on all digital pins. Its SPI interface operates in two compatible modes, latching input data on the rising edge of C and outputting data on the falling edge - enabling interoperability with standard microcontroller SPI peripherals without protocol translation.

Write protection is enforced via non-volatile BP1/BP0 bits in the Status Register and hardware-level SRWD/W pin interaction, allowing deterministic freeze of protected regions. The Identification Page supports permanent locking (via LID instruction) after programming, ensuring immutable device identity and critical calibration data in field-deployed systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	256 Kbit (32 Kbytes), organized as 512 × 64-byte pages - enables efficient firmware patching and parameter logging with minimal bus overhead.
Max clock frequency	20 MHz at V_CC ≥ 4.5 V - supports high-throughput configuration loading in real-time control loops.
Operating temperature	−40 °C to +105 °C - qualified to AEC-Q100 Grade 2, suitable for under-hood automotive applications.
Write endurance	4 million cycles at 25 °C; 900 k cycles at 105 °C - enables reliable logging in thermal-cycling environments like engine management.
Data retention	>50 years at 105 °C - ensures long-term integrity of calibration data without periodic refresh.
Write protection	Configurable 1/4, 1/2, or full memory block lock via Status Register - prevents accidental overwrites during firmware updates.
ESD rating	4000 V HBM - provides robustness against handling and board-level electrostatic discharge in manufacturing and service.

Pinout & Package

Package: SO8 (MN), 150 mil width, RoHS-compliant and halogen-free ECOPACK2®.

Pin/Terminal	Circuit Role	Design Meaning
S	Chip Select	Active-low enable signal; edge- and level-sensitive - prevents spurious command execution during power-up or noise events.
C	Serial Clock	Synchronizes all SPI transfers; supports CPOL=0/CPHA=0 and CPOL=1/CPHA=1 modes - ensures compatibility with diverse MCU peripherals.
D	Serial Data Input	Latches instructions, addresses, and write data on rising clock edge - defines timing-critical setup/hold requirements for host controller design.
Q	Serial Data Output	Drives read data on falling clock edge; high-impedance when deselected - eliminates bus contention in multi-device SPI configurations.
W	Write Protect	Hardware-enforced lock for Status Register when SRWD=1 and W=low - provides tamper-resistant configuration lockdown.
HOLD	Communication Pause	Halts ongoing SPI transfer without deselecting device - enables priority interrupt handling in time-sensitive systems.
V_CC	Supply voltage	1.7–5.5 V operation - allows direct interfacing with 1.8 V, 3.3 V, and 5 V logic domains without level shifters.
V_SS	Ground reference	Common return for all signals and supply - requires low-impedance PCB grounding to maintain noise immunity and timing margins.

Key Features

Feature	Design Value
Embedded ECC logic	Corrects single-bit errors and detects double-bit errors per 64-byte page - improves data integrity in electrically noisy automotive environments.
Identification Page	64-byte dedicated area with permanent lock capability (LID instruction) - secures ST device ID and customer-specific calibration parameters against overwrite.
Schmitt-trigger inputs	Applied to all digital pins (S, C, D, HOLD, W) - rejects sub-microsecond noise transients common in vehicle power systems.
Short write cycle time	≤4 ms for both byte and page writes - minimizes system latency during configuration updates or event logging.
Extended voltage range	1.7–5.5 V operation with guaranteed 20 MHz speed above 4.5 V - simplifies power architecture across mixed-voltage boards.

Applications

Automotive Body Control Unit

Industrial PLC Configuration Storage

Use Scenario: Storing seat position presets, mirror angles, and lighting profiles in vehicles with manual or automatic recall functions.

IC Role / Device Role / Timing Role: Nonvolatile configuration register holding user-defined settings across ignition cycles; accessed during boot and runtime via SPI.

Use Value: Retains calibrated values for >50 years at 105 °C ambient, eliminating need for battery-backed RAM or external supervision circuitry.

Use Scenario: Saving I/O mapping tables, PID tuning parameters, and alarm thresholds in modular programmable logic controllers deployed in factory automation.

IC Role / Device Role / Timing Role: Field-updatable parameter store accessed during startup and maintenance mode; write-protected during normal operation.

Use Value: Block-level write protection prevents accidental corruption during firmware updates, while 4 million write cycles support decades of commissioning cycles.

Medical Infusion Pump Calibration

Smart Energy Meter Firmware Patching

Use Scenario: Storing flow-rate calibration coefficients, motor compensation curves, and safety limits in Class II medical devices requiring traceable configuration history.

IC Role / Device Role / Timing Role: Secure, locked Identification Page holds factory-programmed calibration data; main array stores field-adjusted offsets.

Use Value: Permanent lock (LID) ensures regulatory compliance by preventing unauthorized modification of certified calibration values.

Use Scenario: Applying minor firmware patches or tariff table updates remotely via secure bootloader in utility-grade electricity meters operating in outdoor enclosures.

IC Role / Device Role / Timing Role: High-reliability update storage with ECC correction - accepts signed OTA payloads and verifies integrity before committing to memory.

Use Value: ECC-enabled 64-byte page writes ensure bit-flip resilience in thermally stressed outdoor deployments, reducing field failure rates.

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial SPI EEPROM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AT25DF256A-SSH-T	256 Kbit SPI Flash (not EEPROM); no byte-alterability; requires sector erase before write.	Not suitable for frequent small-parameter updates; better for firmware image storage.	Select only if primary use is infrequent code storage, not runtime configuration logging.
BR25H256FJ-WE2	256 Kbit SPI EEPROM; 125 °C rating; 10 MHz max clock; no Identification Page or ECC.	Lacks lockable ID page and embedded error correction - less suited for safety-critical calibration storage.	Prefer when extended temperature margin (>105 °C) is mandatory but ECC and ID security are secondary.

Compared with AT25DF256A-SSH-T and BR25H256FJ-WE2, the M95256-DRMN8TP/K uniquely combines AEC-Q100 Grade 2 qualification, ECC-protected byte-alterable memory, and a permanently lockable Identification Page - making it the only choice for automotive and medical applications demanding simultaneous reliability, security, and field update flexibility.

Availability

M95256-DRMN8TP/K is available at Aetrix Electronics and suitable for automotive body control units, industrial PLCs, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature and long product lifecycles.

Supply support for M95256-DRMN8TP/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 ICs.

The M95256-DRMN8TP/K belongs to ST's automotive-qualified serial EEPROM product line, designed specifically for mission-critical nonvolatile storage in harsh environments where data integrity, longevity, and functional safety are paramount.

FAQ

Is M95256-DRMN8TP/K pin-compatible with earlier M95256-D series variants?

Yes - M95256-DRMN8TP/K uses the same SO8 (MN) package footprint and identical pinout as M95256-DW, M95256-DR, and M95256-DF variants. All share identical signal assignments (S, C, D, Q, W, HOLD, V_CC, V_SS) and electrical timing, enabling drop-in replacement in existing designs without layout changes.

Does the Identification Page support write-locking after initial programming?

Yes - the 64-byte Identification Page can be permanently locked using the Lock Identification Page (LID) instruction. Once executed, subsequent WRID or LID commands are rejected, and the page becomes read-only for the remainder of the device's lifetime, ensuring immutability of factory-programmed IDs and critical calibration data.

What is the minimum V_CC required to achieve 10 MHz SPI operation?

The device supports 10 MHz SPI operation at V_CC ≥ 2.5 V, as specified in the datasheet's AC characteristics table. Below 2.5 V, maximum clock frequency drops to 5 MHz (V_CC ≥ 1.7 V). This graded speed scaling allows robust operation across wide input voltage ranges without external clock dividers.

How does the HOLD pin behave during an active write cycle?

The HOLD pin is ignored during active write cycles (t_W); it only pauses read and command-setup operations. If asserted during a Write instruction, the device completes the ongoing internal write before entering Hold mode - ensuring data integrity is never compromised by premature pause requests.

M95256-DRMN8TP/K 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:: SPI

Clock Frequency:: 20 MHz

Write Cycle Time - Word, Page:: 4ms

Access Time:: -

Voltage - Supply:: 1.8V ~ 5.5V

Operating Temperature:: -40°C ~ 105°C (TA)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SO

M95256-DRMN8TP/K FAQ

1.How can I place an order for M95256-DRMN8TP/K through Aetrix?

Please submit a Request for Quotation (RFQ) for M95256-DRMN8TP/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-DRMN8TP/K reliable?

The price and inventory of M95256-DRMN8TP/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-DRMN8TP/K is usually 5 days.

3.What payment methods are accepted for M95256-DRMN8TP/K?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M95256-DRMN8TP/K transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M95256-DRMN8TP/K?

M95256-DRMN8TP/K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M95256-DRMN8TP/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-DRMN8TP/K?

For technical support, including M95256-DRMN8TP/K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M95256-DRMN8TP/K requirements.

6.How does Aetrix verify that M95256-DRMN8TP/K is sourced from the original manufacturer or authorized distributors?

All M95256-DRMN8TP/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-DRMN8TP/K meets industry standards.

7.What is the process for return or replacement of M95256-DRMN8TP/K?

All M95256-DRMN8TP/K units undergo pre-shipment inspection (PSI). If there is an issue with M95256-DRMN8TP/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-DRMN8TP/K part is unused and in its original packaging.

Return procedure for M95256-DRMN8TP/K:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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