STMicroelectronics M95M01-DWDW3TP/K

Overview

M95M01-DWDW3TP/K from STMicroelectronics is an automotive-grade 1-Mbit serial SPI EEPROM with AEC-Q100 Grade 0 qualification, ASIL-B ready compliance, and operation up to +145°C. It features 512 pages × 256 bytes, embedded ECC for data integrity, a lockable 256-byte identification page, and supports up to 16 MHz SPI clock frequency in CPOL=0/CPHA=0 or CPOL=1/CPHA=1 modes.

For engineers reviewing the M95M01-DWDW3TP/K datasheet, M95M01-DWDW3TP/K pinout, M95M01-DWDW3TP/K application, or M95M01-DWDW3TP/K equivalent, key selection criteria include write endurance at high temperature (+145°C), hardware/software write protection granularity, identification page locking capability, and SO8N package compatibility with automotive PCB layouts.

Technical Context

This device implements a byte-alterable 131072 × 8-bit memory array organized into 512 pages, with dedicated ECC logic correcting single-bit errors and detecting double-bit errors during read operations. The status register includes WIP, WEL, BP1/BP0, and SRWD bits enabling precise control over write enable state, block protection size (none, upper quarter, upper half, or full array), and status register writability.

It supports two SPI modes (CPOL=0/CPHA=0 and CPOL=1/CPHA=1) with data latched on rising clock edge and output shifted on falling edge. The HOLD pin enables communication pause without chip deselection, while the W pin and SRWD bit jointly enforce hardware-based status register write protection when W is low and SRWD=1.

Key Specifications

Pinout & Package

Package: SO8N (150 mil width), ECOPACK2-compliant, RoHS-compliant, surface-mount plastic small outline package with gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT25DF041A-SSH-T and BR24G128FJ-WE2, the M95M01-DWDW3TP/K uniquely delivers AEC-Q100 Grade 0, ASIL-B readiness, +145°C operation, ECC, and lockable ID page - making it the only viable choice for safety-critical, high-temperature automotive memory applications requiring SPI interface.

Availability

M95M01-DWDW3TP/K is available at Aetrix Electronics and suitable for engine control units, ADAS domain controllers, electric power steering systems, and body control modules requiring stable component supply across extended automotive temperature ranges and functional safety compliance.

Supply support for M95M01-DWDW3TP/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, designing and manufacturing microcontrollers, power management ICs, sensors, and memory solutions for automotive, industrial, and consumer markets.

The M95M01 series belongs to ST's automotive EEPROM product line, engineered specifically for mission-critical data storage in harsh environments where reliability, longevity, and functional safety certification are mandatory.

FAQ

What is the maximum operating temperature for M95M01-DWDW3TP/K?

The M95M01-DWDW3TP/K is rated for operation from –40°C to +145°C and is qualified per AEC-Q100 Grade 0. This rating applies specifically to devices manufactured in the CMOSF8H process variant, which matches the part number suffix indicating high-temperature capability. It is validated for continuous operation in under-hood engine control applications.

Does M95M01-DWDW3TP/K support hardware write protection of the entire memory array?

Yes - hardware write protection of the full memory array (including the identification page) is enabled by setting BP1=1 and BP0=1 in the status register, then asserting the W pin low while SRWD=1. This configuration freezes the protection settings and prevents any further writes to the status register or memory until W is pulled high.

How does the embedded ECC logic function during read operations?

The ECC logic operates transparently during every READ instruction: it computes and checks Hamming codes on-the-fly, automatically corrects single-bit errors in the 256-byte page buffer before data is shifted out on Q, and flags uncorrectable double-bit errors via status register bits. No host software intervention is required for correction.

Can the identification page be used exclusively for application-specific data?

Yes - the 256-byte identification page contains factory-programmed ST device ID in the first three bytes (20h, 00h, 11h), but the remaining 253 bytes are initialized to 0xFF and fully available for application use. Once written, the entire page can be permanently locked in read-only mode using the LID instruction, preventing overwrite while preserving read access.