STMicroelectronics M95512-RCS6TP/K

Overview

M95512-RCS6TP/K from STMicroelectronics is a 512-Kbit (64-Kbyte) serial SPI EEPROM organized as 65536 × 8 bits, operating from 1.8 V to 5.5 V over –40 °C to +85 °C. It features 128-byte page write capability with ≤5 ms write time, hardware- and software-based write protection (quarter/half/whole array), and an additional 128-byte Identification page for locked application parameters. Used in industrial control modules for firmware parameter storage and calibration data retention.

For engineers reviewing the M95512-RCS6TP/K datasheet, M95512-RCS6TP/K pinout, M95512-RCS6TP/K application, or M95512-RCS6TP/K equivalent, this device supports CPOL=0/CPHA=0 and CPOL=1/CPHA=1 SPI modes, offers >4 million write cycles, 200-year data retention, ECOPACK2-compliant packaging, and robust ESD protection - critical for embedded systems requiring long-term nonvolatile configuration storage under voltage and thermal stress.

Technical Context

The M95512-RCS6TP/K implements a synchronous SPI interface with dual-mode clock polarity support (CPOL/CPHA = 0/0 or 1/1), where data is latched on the rising edge of C and output on its falling edge. Its internal architecture includes a status register with WIP/WEL/BP1/BP0/SRWD bits, enabling precise control over write enable state and block-level memory protection.

It integrates a high-voltage generator and sequencer for internal write operations, ECC logic for data integrity, and a dedicated Identification page (128 bytes) accessible only via RDID/WRID instructions - a feature exclusive to the -DF/-R variants and absent in the -W version. The HOLD pin allows communication suspension without chip deselection, preserving instruction context during host interrupt handling.

Key Specifications

Pinout & Package

Package: UFDFPN8 (2 mm × 3 mm, 0.5 mm pitch), ECOPACK2-compliant, halogen-free, RoHS-compliant surface-mount package optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT25DF512C-SSH-T, M95512-RCS6TP/K delivers deterministic 5 ms write latency and >4M endurance essential for frequent parameter updates, whereas the flash alternative incurs variable erase latency and lower write-cycle tolerance. Against M95512-DFMN6TP/K, the -RCS6TP/K offers superior board-area efficiency and thermal performance in compact medical or automotive modules.

Availability

M95512-RCS6TP/K is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, smart energy meters, and medical infusion pumps requiring stable component supply, long-term obsolescence management, and ECOPACK2-compliant sourcing.

Supply support for M95512-RCS6TP/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 industrial, automotive, and consumer markets.

This device belongs to ST's M95xxx serial EEPROM product line, engineered specifically for reliable, low-voltage, high-endurance nonvolatile storage in resource-constrained embedded systems where data integrity and long-term retention are mission-critical.

FAQ

What SPI modes does M95512-RCS6TP/K support?

M95512-RCS6TP/K supports two SPI modes: CPOL = 0, CPHA = 0 and CPOL = 1, CPHA = 1. In both, input data is latched on the rising edge of the serial clock (C), and output data appears on the falling edge. The difference lies only in idle clock polarity - C remains low in mode 0,0 and high in mode 1,1 - ensuring compatibility with most modern MCUs without protocol translation.

How is the Identification page different from main memory?

The Identification page is a dedicated 128-byte memory region accessible only via RDID/WRID instructions (not standard READ/WRITE). It can be permanently locked to read-only mode using the LID instruction, making it ideal for storing immutable device-specific data like calibration constants or cryptographic keys that must survive firmware updates and cannot be overwritten accidentally or maliciously.

Can M95512-RCS6TP/K operate reliably at 1.8 V?

Yes - the "-R" suffix explicitly denotes 1.8 V to 5.5 V operation. At 1.8 V, it maintains full functionality including 16 MHz SPI clock support, ≤5 ms write times, and all protection features. This enables direct integration with 1.8 V logic families and ultra-low-power microcontrollers without level shifters or voltage boosters.

What happens if HOLD is asserted mid-transaction?

When HOLD is driven low while Chip Select (S) is low, serial communication pauses immediately: Q goes high-impedance, and D/C are ignored. The internal state (address counter, instruction decode) is preserved. Communication resumes on HOLD high, with no loss of context - enabling host MCU interrupt servicing without aborting EEPROM operations or requiring re-initialization.