STMicroelectronics M95040-DRMN3TP/K

Overview

M95040-DRMN3TP/K from STMicroelectronics is an AEC-Q100 Grade 0 qualified 4-Kbit serial SPI EEPROM designed for automotive powertrain and body control modules. It delivers 512 × 8-bit nonvolatile storage with 16-byte page architecture, 20 MHz max clock (V_CC ≥ 4.5 V), and operation up to +145 °C - enabling reliable data logging in engine control units and airbag controllers.

For engineers reviewing the M95040-DRMN3TP/K datasheet, M95040-DRMN3TP/K pinout, M95040-DRMN3TP/K application, or M95040-DRMN3TP/K equivalent, key selection criteria include high-temperature endurance (600 k write cycles at 125 °C), block-level write protection (¼/½/whole memory), identification page locking, and SPI mode compatibility (CPOL=0/1, CPHA=0/1).

Technical Context

This device implements a byte-alterable EEPROM array organized as 32 pages of 16 bytes each, with embedded ECC logic for enhanced data integrity. It supports dual-voltage operation: 1.7–5.5 V at ≤125 °C and 2.5–5.5 V at ≤145 °C, enabling use across 12 V and 48 V automotive subsystems.

The SPI interface operates in two standard modes (CPOL=0/CPHA=0 and CPOL=1/CPHA=1), with input latching on rising clock edge and output shifting on falling edge. The HOLD pin enables communication pause without clock reset, while the W pin provides hardware-level status register write protection.

Key Specifications

Pinout & Package

Package: WFDFPN8 (2 mm × 3 mm, ECOPACK2-compliant DFN). Compact footprint supports high-density automotive PCB layouts with thermal performance suitable for under-hood placement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT25DF041A-SSH-T and BR24G04FJ-WE2, the M95040-DRMN3TP/K uniquely combines AEC-Q100 Grade 0, 145 °C operation, SPI HOLD functionality, and a lockable identification page - making it the sole fit for safety-critical, high-temperature automotive control nodes requiring traceable calibration storage.

Availability

M95040-DRMN3TP/K is available at Aetrix Electronics and suitable for engine control units, ADAS sensor modules, electric power steering systems, and body control modules requiring stable component supply across extended automotive lifecycles.

Supply support for M95040-DRMN3TP/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, specializing in automotive, industrial, and power management ICs with strong functional safety and AEC-Q100 design expertise.

The M95040 series belongs to ST's automotive-grade serial EEPROM product line, engineered specifically for mission-critical data storage in powertrain, chassis, and ADAS systems where extended temperature operation and long-term data integrity are mandatory.

FAQ

What is the maximum write endurance at 145 °C?

The M95040-DRMN3TP/K guarantees 400,000 write cycles at +145 °C, validated per AEC-Q100 stress test conditions. This rating is measured using accelerated life testing at elevated temperature and voltage, and applies to both byte and page write operations across the full memory array and identification page.

How does the identification page differ from main memory?

The identification page is a dedicated 16-byte region with factory-programmed ST device ID (bytes 0–2: 20h/00h/09h) and user-writable/application-specific fields. Unlike main memory, it supports the LID instruction to permanently disable all future writes - a feature absent in the 512-byte main array, which only supports block-level protection via BP bits.

Can the HOLD pin be used during a write cycle?

No - the HOLD function is disabled during active write cycles (t_W). The device ignores HOLD transitions until the internal write operation completes and the WIP bit clears. This ensures data integrity: attempting to hold mid-write would risk incomplete programming or ECC corruption.

Is hardware write protection (W pin) active during power-up?

Yes - the W pin is active immediately after power-on reset. When held low, it prevents all status register writes (including BP1/BP0 changes), even before the first WREN instruction. This provides fail-safe protection against spurious writes during supply ramp-up or brown-out conditions.