STMicroelectronics M95640-DRMN8TP/K

Overview

M95640-DRMN8TP/K from STMicroelectronics is a 64-Kbit (8 Kbytes) serial SPI EEPROM with 32-byte page architecture, rated for extended temperature operation up to 105 °C and supply voltage range 1.7 V–5.5 V. It features block-wise write protection (1/4, 1/2, or full memory), an additional lockable 32-byte Identification Page, and embedded ECC logic for enhanced data integrity - deployed in automotive body control modules for calibration storage and fault log retention.

For engineers reviewing the M95640-DRMN8TP/K datasheet, M95640-DRMN8TP/K pinout, M95640-DRMN8TP/K application, or M95640-DRMN8TP/K equivalent, key selection criteria include guaranteed 105 °C endurance (900 k write cycles), Schmitt-trigger noise immunity on all inputs, and support for dual SPI modes (CPOL=0/CPHA=0 and CPOL=1/CPHA=1) without external level-shifting.

Technical Context

This device implements a true EEPROM array organized as 256 × 32-byte pages, with dedicated status register (WIP, WEL, BP1/BP0, SRWD) controlling write enable state and protection granularity. The Identification Page is physically separate and supports permanent lock via LID instruction after WRID programming.

It operates across three clock speed tiers: 20 MHz at V_CC ≥ 4.5 V, 10 MHz at V_CC ≥ 2.5 V, and 5 MHz at V_CC ≥ 1.7 V - each validated under full temperature range. Hold mode suspends ongoing SPI transfers without resetting internal state, and Write Disable (WRDI) resets WEL independently of power cycling.

Key Specifications

Pinout & Package

Package: TSSOP8 (DW), 169 mil width, 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 AT25DF041A-SSH-T and BR24G64FJ-3GE2, the M95640-DRMN8TP/K uniquely combines AEC-Q100 Grade 2 qualification, embedded ECC, lockable ID page, and 900 k write cycles at 105 °C - making it the sole option meeting functional safety and longevity requirements for automotive and medical embedded storage.

Availability

M95640-DRMN8TP/K is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLCs, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature and voltage ranges.

Supply support for M95640-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 M95640-DRMN8TP/K belongs to ST's automotive-qualified serial EEPROM product line, engineered specifically for mission-critical data logging and calibration storage where reliability at 105 °C and long-term data integrity are non-negotiable.

FAQ

What is the function of the HOLD pin, and how does it differ from Chip Select (S)?

The HOLD pin pauses ongoing SPI communication without deselecting the device or resetting internal state - preserving command context during CPU interrupts. In contrast, driving Chip Select (S) high fully deselects the device, forcing Serial Data Output (Q) into high-impedance and terminating the current transaction. HOLD enables deterministic timing-critical access; S controls session initiation/termination.

How is write protection implemented, and can it be reversed after locking?

Write protection is implemented via two independent mechanisms: (1) Block Protect bits (BP1/BP0) in the Status Register define protected memory regions (none, 1/4, 1/2, or full), and (2) the Identification Page can be permanently locked using the LID instruction. Once LID executes, the ID page becomes read-only forever. BP1/BP0 settings remain changeable unless SRWD=1 and W pin is held low - then protection is frozen until W is pulled high.

Does this EEPROM require external pull-up resistors on its SPI lines?

No external pull-ups are required. All inputs (S, C, D, HOLD, W) feature Schmitt-trigger receivers with internal weak pull-downs specified in the datasheet (I_IL ≤ ±1 µA). The Q output is actively driven and high-impedance when deselected. Pull-ups may be added only if board-level noise exceeds the 100 mV hysteresis window - not for basic functionality.

What validation evidence confirms AEC-Q100 Grade 2 compliance?

AEC-Q100 Grade 2 qualification is documented in ST's official product release documentation (DocID027381 Rev 2, Section 1) and verified through accelerated stress testing including 1000-hour HTOL at 125 °C, temperature cycling (−40 °C to +125 °C), and ESD testing per HBM 4000 V. The part number suffix "-DR" explicitly denotes AEC-Q100 Grade 2 qualification in ST's ordering scheme.