STMicroelectronics M95320-DFMN6TP

Overview

M95320-DFMN6TP from STMicroelectronics is a 32-Kbit serial SPI bus EEPROM organized as 4096 × 8 bits, operating from 1.7 V to 5.5 V supply and rated for –40°C to +85°C industrial temperature range. It features 32-byte page writes completing in ≤5 ms, 20 MHz high-speed clock support, and an additional lockable 32-byte Identification Page for secure parameter storage - deployed in embedded control modules requiring nonvolatile configuration retention.

For engineers reviewing the M95320-DFMN6TP datasheet, M95320-DFMN6TP pinout, M95320-DFMN6TP application, or M95320-DFMN6TP equivalent, key selection criteria include its 1.7 V minimum V_CC, ECOPACK2® UFDFPN8 (2 × 3 mm) package, quarter/half/whole array write protection, >4 million write cycles, and SPI mode compatibility (CPOL=0/CPHA=0 and CPOL=1/CPHA=1).

Technical Context

This EEPROM implements a standard SPI interface with dedicated Serial Clock (C), Serial Data Input (D), Serial Data Output (Q), Chip Select (S), HOLD, and Write Protect (W) terminals. Its internal architecture includes a status register with WIP, WEL, BP1/BP0, and SRWD bits enabling precise write-lock granularity and real-time operation monitoring.

It supports byte and page write operations with automatic internal write-cycle timing, integrated power-on reset (POR), and enhanced ESD protection. The Identification Page-accessible only in M95320-D variants-is nonvolatile, programmable, and permanently lockable to Read-only mode, providing tamper-resistant storage for calibration data or device-specific identifiers.

Key Specifications

Pinout & Package

Package: UFDFPN8 (ECOPACK2®), 2 × 3 mm, 0.5 mm pitch, exposed pad - optimized for space-constrained PCB layouts and thermally demanding applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95320-DFMN6TP, AT25DF321A offers greater density and faster quad-mode throughput but sacrifices low-voltage flexibility and secure ID page locking; M95320-WMN6TP provides pin-for-pin compatibility at lower cost but omits both the ID page and sub-2.5 V operation - making M95320-DFMN6TP uniquely suited for secure, ultra-low-power embedded configurations.

Availability

M95320-DFMN6TP is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, medical infusion pump controllers, and smart energy meter firmware patch storage requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.

Supply support for M95320-DFMN6TP 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 specializing in microcontrollers, power management, sensors, and nonvolatile memory solutions for industrial, automotive, and consumer markets.

M95320-DFMN6TP belongs to ST's M95320-D series of SPI EEPROMs, engineered specifically for applications demanding secure, low-voltage, high-endurance configuration storage with hardware-enforced write protection.

FAQ

What is the function of the HOLD pin on M95320-DFMN6TP?

The HOLD pin pauses ongoing SPI communication without deselecting the device. When asserted low while Chip Select (S) is active, it places Serial Data Output (Q) in high-impedance state and ignores Serial Clock (C) and Serial Data Input (D). This allows the host microcontroller to temporarily suspend EEPROM access - for example, to handle a higher-priority interrupt - then resume the exact same transaction without reinitializing the command sequence.

How does the Identification Page differ from standard memory pages?

The Identification Page is a dedicated 32-byte memory region accessible only in M95320-D variants. Unlike standard pages, it supports a Lock ID command that permanently disables further writes, converting it to read-only mode. Its contents - such as calibration constants or cryptographic keys - remain intact even after standard erase/write cycles elsewhere in the array, and retain data for 200 years under industrial temperature conditions.

Can M95320-DFMN6TP operate reliably at 1.7 V during write operations?

Yes. The M95320-DF variant is fully specified for write operations down to 1.7 V, with guaranteed ≤5 ms write time and proper status register behavior across the full –40°C to +85°C range. This is validated in Table 10 (Operating Conditions) and Table 19 (AC Characteristics) of the official datasheet (DocID5711 Rev 16), distinguishing it from the M95320-W and M95320-R variants which require ≥2.5 V and ≥1.8 V respectively.

Which SPI modes are supported, and how do they affect timing?

M95320-DFMN6TP supports two SPI modes: CPOL=0/CPHA=0 and CPOL=1/CPHA=1. In both, data is latched on the rising edge of Serial Clock (C) and output changes on the falling edge. The difference lies only in idle clock polarity: C remains low in mode 0 and high in mode 3. This dual-mode support ensures compatibility with diverse microcontroller SPI peripherals without requiring hardware modifications or software workarounds.