STMicroelectronics M95M02-DRMN6TP

Overview

M95M02-DRMN6TP from STMicroelectronics is a 2-Mbit serial SPI EEPROM organized as 262,144 × 8 bits, serving as nonvolatile memory for firmware storage, calibration data retention, and configuration parameter backup in microcontroller-based systems. It operates from 1.8 V to 5.5 V over –40 °C to +85 °C, supports 5 MHz clock frequency, features 256-byte page write (≤10 ms), and includes hardware- and software-based write protection including an additional lockable 256-byte identification page.

For engineers reviewing the M95M02-DRMN6TP datasheet, M95M02-DRMN6TP pinout, M95M02-DRMN6TP application, or M95M02-DRMN6TP equivalent, key selection considerations include SPI mode compatibility (CPOL/CPHA = 0/0 or 1/1), block-protection granularity (¼/½/whole memory), identification page lockability, VCC operating range tolerance, and SO8N package mechanical fit for industrial PCB layouts.

Technical Context

This device implements a standard SPI interface with dedicated HOLD and W signals enabling communication pause and hardware-level status register protection. Its internal architecture includes ECC-enabled sense amplifiers, page latches, and an HV generator for reliable byte/page programming across >4 million write cycles.

The status register (SR) provides real-time visibility into write-in-progress (WIP) and write-enable-latch (WEL) states, while BP1/BP0 bits configure nonvolatile block protection - with SRWD bit + W pin enabling irreversible hardware lock of BP/SRWD bits once asserted.

Key Specifications

Pinout & Package

Package: SO8N (150 mil width), RoHS-compliant ECOPACK2, surface-mount with standard 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT25DF21A-SSHN-B and BR24M256FJ-WE2, the M95M02-DRMN6TP uniquely combines SPI-native 2 Mbit density, hardware-enforced status register locking, and a dedicated 256-byte identification page - making it optimal for safety-critical, field-upgradable embedded systems requiring guaranteed long-term data integrity and secure parameter binding.

Availability

M95M02-DRMN6TP is available at Aetrix Electronics and suitable for industrial PLC configuration storage, medical device calibration data backup, and automotive body control module applications requiring stable component supply, extended temperature operation, and certified long-term data retention.

Supply support for M95M02-DRMN6TP 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 ICs, sensors, and memory solutions for industrial, automotive, and consumer markets.

The M95M02 series belongs to ST's serial EEPROM product line, engineered specifically for robust, low-power, SPI-based nonvolatile storage in mission-critical embedded systems where data integrity, security, and extended temperature resilience are mandatory.

FAQ

What SPI modes does M95M02-DRMN6TP support?

The M95M02-DRMN6TP supports two SPI modes: CPOL = 0, CPHA = 0 and CPOL = 1, CPHA = 1. In both, data is latched on the rising edge of the serial clock (C) and output changes on the falling edge. The difference lies only in idle clock polarity - ensuring compatibility with most MCU SPI peripherals without mode reconfiguration.

How is write protection implemented on this EEPROM?

Write protection uses dual mechanisms: software-configurable block protection (BP1/BP0 bits in status register) for ¼/½/full memory lock, and hardware-enforced protection via the W pin combined with the SRWD bit. When SRWD = 1 and W is driven low, the status register becomes permanently read-only - preventing unauthorized modification of protection settings.

Can the identification page be erased after being locked?

No. Once the identification page is locked using the LID instruction, it becomes permanently read-only and cannot be erased or rewritten - even with power cycling or WREN/WRSR commands. This one-time programmability ensures cryptographic keys or device IDs remain immutable throughout the product lifecycle.

What is the maximum clock frequency for reliable operation?

The M95M02-DRMN6TP guarantees reliable operation up to 5 MHz across its full temperature and voltage range (–40 °C to +85 °C, 1.8–5.5 V). AC timing parameters including tSHSL (setup time for S relative to C) and tDH (data hold time) are fully characterized at this frequency in the official DS7024 datasheet Rev 13.