STMicroelectronics M95M01-DFDW6TP

Overview

M95M01-DFDW6TP from STMicroelectronics is a 1 Mbit (131,072 × 8) serial SPI EEPROM with an additional 256-byte identification page, operating from 1.7 V to 5.5 V across –40 °C to +85 °C. It supports up to 16 MHz clock frequency, delivers byte/page write within 5 ms, and offers >4 million write cycles with >200-year data retention. Used in industrial control modules for storing calibration parameters and firmware configuration.

For engineers reviewing the M95M01-DFDW6TP datasheet, M95M01-DFDW6TP pinout, M95M01-DFDW6TP application, or M95M01-DFDW6TP equivalent, key selection factors include its dual-voltage operation, hardware/software write protection granularity (quarter/half/whole array), identification page lock capability, and TSSOP8 ECOPACK2 packaging with 169-mil width.

Technical Context

The M95M01-DFDW6TP implements a standard SPI interface with CPOL=0/CPHA=0 or CPOL=1/CPHA=1 modes, using dedicated D (input), Q (output), and C (clock) signals synchronized on rising/falling edges respectively. Chip select (S) enables device selection and initiates instruction decoding after power-up reset.

It features a nonvolatile status register with WIP, WEL, BP1/BP0, and SRWD bits controlling write enable state, block protection size (0–100% of memory), and hardware lock of status register via W pin. The identification page supports permanent read-only locking via LID instruction - exclusive to the -DF variant.

Key Specifications

Pinout & Package

TSSOP8 (DW) package, 169 mil width, ECOPACK2-compliant, surface-mount with exposed pad not present. Pin 1 marked by notch or dot; top view orientation per Figure 2 in DS5137 Rev 16.

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 M95M02-DFMN6TP, the M95M01-DFDW6TP uniquely balances wide-voltage operation, secure ID page functionality, and compact TSSOP8 packaging - making it optimal for space-constrained, multi-rail embedded systems requiring long-term parameter integrity.

Availability

M95M01-DFDW6TP is available at Aetrix Electronics and suitable for industrial PLCs, smart meters, automotive body control modules, and medical infusion pumps requiring stable component supply across extended temperature and voltage ranges.

Supply support for M95M01-DFDW6TP 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.

The M95M01 series belongs to ST's serial EEPROM product line, engineered specifically for robust, low-power, and secure nonvolatile storage in harsh environments - emphasizing voltage flexibility, data integrity, and long-term reliability.

FAQ

What is the function of the HOLD pin on M95M01-DFDW6TP?

The HOLD pin pauses ongoing SPI communication without deselecting the device or resetting internal state. When asserted low (with S low and C low), it places Q in high-impedance mode and ignores D and C transitions. This allows the host MCU to service higher-priority interrupts while preserving transaction context - critical in real-time control systems where deterministic timing is essential.

How does the identification page differ between M95M01-DF and M95M01-R?

The identification page (256 bytes) exists only in the M95M01-DF variant, including M95M01-DFDW6TP. It supports RDID/WRID instructions and can be permanently locked in read-only mode via the LID instruction. The M95M01-R lacks this page entirely - confirmed in Section 1 and Table 3 of DS5137 Rev 16 - making -DF the sole choice for applications requiring cryptographically separable, tamper-proof parameter storage.

Can M95M01-DFDW6TP operate reliably at 1.7 V during write operations?

Yes - the M95M01-DF variant is fully specified down to 1.7 V for all operations, including byte/page write (t_W ≤ 5 ms) and status register access. DC and AC parameter tables in DS5137 Rev 16 confirm valid timing margins and write success rate across the full 1.7–5.5 V range, enabling direct integration with ultra-low-power MCUs like STM32L4+ without voltage translation.

What happens if the W pin is left floating during power-up?

The W pin must be actively driven high or low; floating violates the absolute maximum ratings and may cause undefined behavior in block protection and SRWD bit interpretation. ST recommends tying W to VCC (for default unprotected mode) or VSS (to pre-enable hardware lock if SRWD is set) via a pull-up/down resistor - as stated in Section 3.6 and Figure 5 of DS5137 Rev 16 - to ensure deterministic status register initialization.