STMicroelectronics M95320-DRMN8TP/K

Overview

M95320-DRMN8TP/K from STMicroelectronics is a 32-Kbit serial SPI EEPROM with 4 Kbytes memory array, 32-byte page size, and extended operation up to 105 °C at V_CC = 1.7–5.5 V. It features embedded ECC logic for data integrity, hardware write protection (1/4, 1/2, or full memory), and a lockable 32-byte Identification Page used for device ID storage and secure parameter retention in automotive body control modules.

For engineers reviewing the M95320-DRMN8TP/K datasheet, M95320-DRMN8TP/K pinout, M95320-DRMN8TP/K application, or M95320-DRMN8TP/K equivalent, key selection criteria include SPI clock tolerance (20 MHz @ ≥4.5 V), industrial-grade endurance (900 k cycles @ 105 °C), identification page locking capability, and RoHS-compliant DFN8 (2 × 3 mm) packaging.

Technical Context

This EEPROM implements a true electrically erasable programmable memory architecture with byte-alterable 4096 × 8-bit organization and on-die Error Correction Code logic that detects and corrects single-bit errors during read operations. The device supports two SPI modes: CPOL=0/CPHA=0 and CPOL=1/CPHA=1, with input data latched on the rising edge of C and output data valid after the falling edge.

Protocol control relies on edge- and level-sensitive Chip Select (S) activation, requiring a prior high-to-low transition before first command acceptance. Write operations require explicit WREN instruction to set the Write Enable Latch (WEL), and status monitoring via RDSR to check WIP flag before issuing subsequent commands.

Key Specifications

Pinout & Package

Package: WFDFPN8 (MLP8), 8-lead very thin fine-pitch dual flat no-lead, 2 × 3 mm body, 0.5 mm pitch, RoHS-compliant and halogen-free (ECOPACK2®).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT25320B-MAHN-T and BR24T32FJ-WE2, the M95320-DRMN8TP/K uniquely combines AEC-Q100 Grade 2 qualification, SPI-compatible 20 MHz speed, embedded ECC, and a user-lockable Identification Page-making it the sole option for safety-critical, high-temperature, field-upgradable automotive and industrial systems requiring guaranteed data integrity and tamper resistance.

Availability

M95320-DRMN8TP/K is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor calibration storage, smart energy meter firmware patching, and medical infusion pump parameter archiving requiring stable component supply across extended temperature and voltage ranges.

Supply support for M95320-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 headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and memory solutions for automotive, industrial, and consumer markets.

The M95320-DRE series belongs to ST's automotive-qualified serial EEPROM product line, engineered specifically for mission-critical data storage in harsh environments where extended temperature operation, high endurance, and hardware-level write protection are mandatory.

FAQ

What is the function of the HOLD pin on M95320-DRMN8TP/K?

The HOLD pin pauses ongoing SPI communication without deselecting the device or resetting internal state. When driven low while Serial Clock (C) is low, it places Q in high-impedance and ignores D and C transitions. This allows a host MCU to temporarily suspend EEPROM access-e.g., during interrupt servicing-then resume seamlessly upon releasing HOLD, preserving command context and timing alignment.

How does the Identification Page differ from main memory in usage?

The Identification Page is a dedicated 32-byte area containing factory-programmed ST device ID bytes (first 3) and 29 bytes for user application data. Unlike main memory, it supports explicit lock commands (LID instruction) that permanently disable further writes to the entire page, making it ideal for storing immutable calibration constants or cryptographic keys that must survive field updates and environmental stress.

Can M95320-DRMN8TP/K operate reliably at 1.7 V and 105 °C simultaneously?

Yes. The device is fully specified for concurrent operation at V_CC = 1.7 V and T_A = 105 °C, with verified 5 MHz maximum SPI clock rate, 900 k write cycles endurance, and >50-year data retention under those conditions. This dual extreme rating is validated per AEC-Q100 Grade 2 and documented in ST's DC/AC parameter tables (Rev 2, Tables 10–13).

Is the Status Register write-protected by default after power-up?

No. At power-up, the Status Register is writable regardless of W pin state because SRWD = 0. Write protection requires explicit programming of SRWD = 1 via WRSR instruction, followed by driving W low. Only then does the combination of SRWD = 1 and W = low freeze BP1/BP0 and WEL bits-enabling irreversible memory block protection for safety-critical applications.