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

STMicroelectronics M95256-DRDW8TP/K

Name: M95256-DRDW8TP/K
Brand: STMicroelectronics
SKU: M95256-DRDW8TP/K
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M95256-DRDW8TP/K

Manufacturer:: STMicroelectronics

Category:: Memory

Package:: 8-TSSOP (0.173", 4.40mm Width)

Datasheet:: M95256-DRDW8TP/K.pdf

Description:: IC EEPROM 256KBIT SPI 8TSSOP

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Product details

Overview

M95256-DRDW8TP/K from STMicroelectronics is a 256-Kbit serial SPI EEPROM with 64-byte page architecture, 105 °C extended temperature rating, and integrated ECC logic for enhanced data integrity in automotive and industrial control systems. It supports up to 20 MHz clock (V_CC ≥ 4.5 V), offers hardware write protection via SRWD/BP bits and W pin, and includes a lockable 64-byte Identification Page for device ID and secure parameter storage.

For engineers reviewing the M95256-DRDW8TP/K datasheet, M95256-DRDW8TP/K pinout, M95256-DRDW8TP/K application, or M95256-DRDW8TP/K equivalent, this page delivers verified technical context, real-world timing behavior, validated alternative options, and production-ready supply guidance - all grounded in ST's official DocID027468 Rev 2 specification.

Technical Context

The device implements a true EEPROM memory array organized as 512 × 64-byte pages (32,768 × 8 bits), with Schmitt-trigger inputs for noise immunity and dual-mode SPI compatibility (CPOL=0/CPHA=0 and CPOL=1/CPHA=1). Its embedded Error Correction Code logic operates per 4-byte group, improving bit-level reliability without host intervention.

Protocol control relies on edge- and level-sensitive Chip Select (S) with mandatory falling-edge initialization post-power-up. Write operations require explicit WREN instruction to set WEL bit, and status register updates are gated by SRWD bit state and W pin voltage - enabling hierarchical, non-volatile block protection (1/4, 1/2, or full memory) plus permanent lock of the Identification Page.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	256 Kbit (32 Kbytes), byte-alterable - enables individual byte updates without block erase overhead.
Page size	64 bytes - defines minimum write granularity and aligns with typical microcontroller buffer sizes.
Max clock frequency	20 MHz at V_CC ≥ 4.5 V - supports high-throughput configuration loading in real-time control loops.
Write endurance	4 million cycles at 25 °C - ensures >10-year field life under daily firmware parameter logging.
Data retention	50+ years at 105 °C - validated for under-hood automotive modules without refresh circuitry.
Operating voltage	1.7 V to 5.5 V - interoperable with 1.8 V logic families and legacy 5 V industrial controllers.
Temperature range	−40 °C to +105 °C - AEC-Q100 Grade 2 qualified for engine control units and powertrain sensors.

Pinout & Package

Package: TSSOP8 (DW), 169 mil width, RoHS-compliant and halogen-free ECOPACK2®.

Pin/Terminal	Circuit Role	Design Meaning
S	Chip Select	Edge- and level-sensitive enable: falling edge required after power-up to initiate first command; high = Q in high-Z.
C	Serial Clock	Synchronizes all I/O; rising edge latches D input, falling edge shifts Q output; supports CPOL/CPHA modes.
D	Serial Data Input	Receives instructions, addresses, and write data MSB-first; sampled on rising C edge.
Q	Serial Data Output	Drives read data MSB-first on falling C edge; high-Z when S is high or HOLD active.
W	Write Protect	Hardware gate for Status Register writes: low + SRWD=1 freezes BP/SRWD bits permanently until W rises.
HOLD	Communication Pause	Halts ongoing SPI transfer without deselecting device; requires C low to activate/deactivate cleanly.
V_CC	Supply Voltage	1.7–5.5 V operation; internal voltage regulator enables stable core logic across wide input range.
V_SS	Ground Reference	Common return for all signals and V_CC; must be low-impedance to support Schmitt-trigger noise filtering.

Key Features

Feature	Design Value
Identification Page	64-byte dedicated area with factory-programmed ST device ID and user-writable fields, lockable to read-only via LID instruction.
Block write protection	Configurable via BP1/BP0 bits: protects upper quarter (6000h–7FFFh), upper half (4000h–7FFFh), or entire memory + ID page.
ECC logic	Embedded per-4-byte correction detects and corrects single-bit errors transparently during read, eliminating external error-handling code.
Hold mode	Pauses active SPI transfers without resetting internal address counters or command state - critical for multi-master bus arbitration.
Fast write cycle	≤4 ms for both byte and page writes - enables rapid calibration data capture in time-critical sensor applications.

Applications

Automotive Engine Control Unit (ECU)

Industrial PLC Configuration Storage

Use Scenario: Storing adaptive fuel trim tables and fault codes in diesel ECU modules operating near exhaust manifolds.

IC Role / Device Role / Timing Role: Non-volatile parameter store with AEC-Q100 Grade 2 qualification and 105 °C sustained operation.

Use Value: Eliminates need for external temperature compensation circuitry while maintaining 50-year data retention at junction temperature.

Use Scenario: Retaining I/O mapping, PID tuning constants, and safety interlock settings across power cycles in modular PLC backplanes.

IC Role / Device Role / Timing Role: SPI-configurable EEPROM interfaced directly to ARM Cortex-M7 controller via hardware-managed CS/HOLD lines.

Use Value: Enables deterministic <4 ms parameter updates during runtime reconfiguration without CPU polling or interrupt latency penalties.

Medical Infusion Pump Calibration

Smart Energy Meter Firmware Parameters

Use Scenario: Securing dose calibration coefficients and usage logs in battery-powered infusion pumps requiring long-term traceability.

IC Role / Device Role / Timing Role: Tamper-resistant storage with lockable Identification Page holding manufacturer-signed calibration signatures.

Use Value: Prevents unauthorized modification of therapy-critical parameters via hardware-enforced write lock (SRWD + W pin).

Use Scenario: Storing tariff schedules, metering constants, and cryptographic keys in ANSI C12.22-compliant smart meters deployed in outdoor enclosures.

IC Role / Device Role / Timing Role: High-reliability SPI EEPROM supporting 1.8 V logic interface and 4 million write cycles for daily billing updates.

Use Value: Guarantees >20-year data integrity at 55 °C ambient with zero refresh cycles, reducing firmware complexity and BOM count.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AT25DF041A-SSH-T	4-Mbit density, no built-in ECC, max 85 °C operation, lacks Identification Page.	Higher capacity but lower temperature grade; unsuitable for under-hood automotive use.	Select only if >256 Kbit memory and cost-per-bit optimization outweigh 105 °C and ECC requirements.
BR25H256FJ-WE2	Rohm part with identical 256 Kbit/64-byte page, 105 °C, and ECC; uses different status register bit layout and no HOLD pin.	Pin-compatible except HOLD omission; requires firmware adaptation for pause functionality.	Choose when HOLD is unused and cross-supplier diversification is prioritized over identical feature parity.

Compared with AT25DF041A-SSH-T, M95256-DRDW8TP/K delivers guaranteed automotive-grade reliability and ECC-assisted data integrity at lower density; versus BR25H256FJ-WE2, it retains full SPI protocol compatibility including HOLD support for multi-master bus coordination.

Availability

M95256-DRDW8TP/K is available at Aetrix Electronics and suitable for automotive engine control, industrial PLC configuration, medical infusion pump calibration, and smart energy meter firmware parameter storage requiring stable component supply across extended temperature and voltage ranges.

Supply support for M95256-DRDW8TP/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 EEPROM design heritage and AEC-Q100 qualification expertise.

This device belongs to ST's M95xxx-DRE serial EEPROM product line, engineered specifically for mission-critical automotive and industrial applications demanding extended temperature operation, high endurance, and hardware-enforced data security.

FAQ

What is the function of the HOLD pin on M95256-DRDW8TP/K?

The HOLD pin pauses ongoing SPI communication without deselecting the device or resetting internal address counters. Activation requires HOLD low and Serial Clock (C) low simultaneously; during HOLD, Q goes high-Z and D/C signals are ignored. This enables clean bus arbitration in multi-master systems and prevents partial command corruption during interrupt service routines.

How does the Identification Page differ from main memory?

The Identification Page is a dedicated 64-byte area separate from the main 256-Kbit array. It contains three factory-programmed ST device ID bytes followed by user-writable space. Unlike main memory, it can be permanently locked to read-only via the LID instruction - preventing overwrite of calibration signatures or security keys while allowing unrestricted access to standard memory regions.

Can M95256-DRDW8TP/K operate reliably at 1.7 V and 105 °C simultaneously?

Yes. The datasheet explicitly specifies 5 MHz maximum clock frequency at V_CC ≥ 1.7 V and operation up to 105 °C, with validated write endurance of 900 k cycles and >50 years data retention at that stress point. This dual-stress rating is confirmed in Table 10 and Table 11 of DocID027468 Rev 2, making it suitable for high-temperature, low-voltage edge nodes.

What protection mechanisms prevent accidental writes to the Status Register?

Status Register writes are gated by two independent controls: the SRWD bit (non-volatile) and the W pin voltage. When SRWD = 1 and W = low, all WRSR attempts are discarded - freezing BP1/BP0 and SRWD bits permanently until W is pulled high. This dual-layer hardware lock eliminates risk of firmware bugs or noise-induced corruption of memory protection settings.

M95256-DRDW8TP/K Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-TSSOP (0.173", 4.40mm 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-TSSOP

M95256-DRDW8TP/K FAQ

1.How can I place an order for M95256-DRDW8TP/K through Aetrix?

Please submit a Request for Quotation (RFQ) for M95256-DRDW8TP/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-DRDW8TP/K reliable?

The price and inventory of M95256-DRDW8TP/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-DRDW8TP/K is usually 5 days.

3.What payment methods are accepted for M95256-DRDW8TP/K?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M95256-DRDW8TP/K transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M95256-DRDW8TP/K?

M95256-DRDW8TP/K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M95256-DRDW8TP/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-DRDW8TP/K?

For technical support, including M95256-DRDW8TP/K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M95256-DRDW8TP/K requirements.

6.How does Aetrix verify that M95256-DRDW8TP/K is sourced from the original manufacturer or authorized distributors?

All M95256-DRDW8TP/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-DRDW8TP/K meets industry standards.

7.What is the process for return or replacement of M95256-DRDW8TP/K?

All M95256-DRDW8TP/K units undergo pre-shipment inspection (PSI). If there is an issue with M95256-DRDW8TP/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-DRDW8TP/K part is unused and in its original packaging.

Return procedure for M95256-DRDW8TP/K:

1.Submit a request within 90 days.

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

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