STMicroelectronics M95640-RMN6P

Overview

M95640-RMN6P from STMicroelectronics is a 64-Kbit serial SPI bus EEPROM organized as 8192 × 8 bits, operating from 1.8 V to 5.5 V supply with -40 °C to +85 °C temperature range. It features 32-byte page write (typ. 3.4 ms), 20 MHz clock support, Schmitt-trigger inputs, and dual-level write protection (software quarter-block + hardware full-array). Used in industrial sensor calibration storage and embedded firmware parameter retention.

For engineers reviewing the M95640-RMN6P datasheet, M95640-RMN6P pinout, M95640-RMN6P application, or M95640-RMN6P equivalent, this page delivers verified electrical specs, SO8 package terminal mapping, real-world use cases for parameter storage, and validated alternatives with documented functional boundaries.

Technical Context

The M95640-RMN6P implements a standard SPI interface supporting CPOL=0/CPHA=0 and CPOL=1/CPHA=1 modes, with data latched on C's rising edge and output on falling edge. Its internal architecture includes an HV generator, ECC-enabled sense amplifiers, page latches, and a status register with WIP, WEL, BP1/BP0, and SRWD bits.

It supports byte/page WRITE, READ, RDSR/WRSR, and device-specific RDID/WRID/LID instructions. The identification page (32 bytes) is lockable in read-only mode via LID command, and hardware write protection is activated when SRWD = 1 and W pin is driven low.

Key Specifications

Pinout & Package

Package: SO8 (ECOPACK2), 150 mil width, RoHS-compliant surface-mount package 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 AT25DF041A-SSH-T and BR24G64FJ-WE2, the M95640-RMN6P uniquely balances 1.8 V SPI compatibility, lockable ID page security, and HOLD-driven transaction pausing-making it optimal for resource-constrained, safety-critical embedded systems requiring deterministic parameter access.

Availability

M95640-RMN6P is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control modules requiring stable component supply, long-lifecycle support, and RoHS-compliant ECOPACK2 packaging.

Supply support for M95640-RMN6P 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, MEMS, and nonvolatile memory solutions for industrial, automotive, and consumer markets.

The M95640 series belongs to ST's serial EEPROM product line, engineered specifically for robust, low-voltage SPI-based parameter storage in harsh environments where data integrity, long retention, and multi-layer write protection are mandatory.

FAQ

What is the function of the HOLD pin on M95640-RMN6P?

The HOLD pin pauses ongoing SPI communication without deselecting the device or resetting internal state. When asserted low (with S low), Q enters high-impedance, and D/C are ignored-enabling priority interrupt handling in multi-master systems. It does not affect active write cycles already in progress.

How does the identification page differ from main memory?

The 32-byte identification page is physically separate, supports RDID/WRID instructions, and can be permanently locked in read-only mode via the LID command. Unlike main array pages, it cannot be erased by bulk operations and is intended for immutable data like calibration keys or device IDs.

Can M95640-RMN6P operate reliably at 1.8 V while running at 20 MHz?

Yes-ST specifies full 20 MHz operation down to 1.8 V for the M95640-R variant. Timing parameters including tCLQV (clock-to-output delay) and tSU (setup time) remain within spec across the entire 1.8–5.5 V range, confirmed in DS6633 Rev 21 AC characteristics Table 12.

What happens if W pin is left floating during operation?

Leaving W floating violates the absolute maximum ratings and may cause unpredictable status register behavior. ST requires W to be actively driven high or low; if hardware protection is unused, tie W to VCC. Floating W risks inadvertent activation of SRWD-based lock, rendering the status register unwritable.