STMicroelectronics M95320-DFDW6TP

Overview

M95320-DFDW6TP from STMicroelectronics is a 32-Kbit serial SPI bus EEPROM organized as 4096 × 8 bits, operating across 1.7 V to 5.5 V supply and -40°C to +85°C ambient. It supports 20 MHz clock speed, 32-byte page writes completing in ≤5 ms, and includes a lockable 32-byte Identification Page for secure parameter storage. Used in industrial control modules for firmware revision tracking and calibration data persistence.

For engineers reviewing the M95320-DFDW6TP datasheet, M95320-DFDW6TP pinout, M95320-DFDW6TP application, or M95320-DFDW6TP equivalent, key selection criteria include its 1.7 V minimum V_CC, ECOPACK2® UFDFPN8 (2 × 3 mm) package, quarter/half/whole array write protection, and >4 million write cycles with >200-year data retention.

Technical Context

This SPI EEPROM implements a standard four-wire interface (C, D, Q, S) with HOLD and W inputs for real-time transaction suspension and hardware-based memory protection. Its status register (WIP, WEL, BP1/BP0, SRWD) enables precise control over write enable state and protected block size-quarter (1 KB), half (2 KB), or full (4 KB) array.

The device supports SPI modes CPOL=0/CPHA=0 and CPOL=1/CPHA=1, latching input on rising clock edge and driving output on falling edge. Internal ECC supports cycling reliability, and the dedicated Identification Page (accessible only in -D variants) allows one-time locking of critical configuration data into read-only mode.

Key Specifications

Pinout & Package

Supplied in ECOPACK2®-compliant UFDFPN8 (2 × 3 mm) package with 0.5 mm pitch and exposed thermal pad. Pin 1 marked by dot; bottom-side thermal pad must be soldered for thermal performance and mechanical reliability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT25DF321A-MAU-T and BR24G32FJ-3GE2, M95320-DFDW6TP uniquely balances ultra-low-voltage operation, hardware-lockable identification storage, and real-time HOLD functionality in a compact 2 × 3 mm footprint-making it optimal for resource-constrained, safety-aware embedded systems requiring guaranteed data integrity.

Availability

M95320-DFDW6TP is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature and voltage ranges.

Supply support for M95320-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 products for industrial, automotive, and consumer markets.

M95320-DFDW6TP belongs to ST's serial EEPROM product line, engineered specifically for robust, low-power, and secure nonvolatile data storage in harsh environments where voltage tolerance, long-term reliability, and hardware-level data protection are critical.

FAQ

What is the function of the HOLD pin on M95320-DFDW6TP?

The HOLD pin (Pin 7) suspends 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 MCU to service higher-priority interrupts or manage power events while preserving the current transaction context-critical for deterministic real-time systems.

How does the Identification Page differ from standard memory pages?

The Identification Page is a dedicated 32-byte area accessible only in M95320-D variants (including M95320-DFDW6TP). Unlike regular memory, it supports Read Identification Page (0x4B), Write Identification Page (0x42), and Lock ID (0x4C) instructions. Once locked via Lock ID, it becomes permanently read-only-even after power cycles-and cannot be erased or rewritten, providing tamper-resistant storage for calibration data or security keys.

Can M95320-DFDW6TP operate reliably during automotive cold-crank conditions?

Yes. With a specified V_CC range of 1.7 V to 5.5 V and guaranteed operation from -40°C to +85°C, M95320-DFDW6TP maintains full SPI functionality-including byte/page writes and status register reads-at 1.7 V. This meets ISO 16750-2 cold-crank voltage dip requirements (down to ~6 V battery, translating to ~1.7 V at 1.8 V logic rails), enabling direct interfacing with automotive MCUs without auxiliary regulation.

What package variant does M95320-DFDW6TP use, and why is thermal pad soldering required?

M95320-DFDW6TP uses the UFDFPN8 (2 × 3 mm) package with an exposed thermal pad (Pin 9, internally connected to VSS). Soldering this pad is mandatory for two reasons: (1) it provides the primary thermal path to dissipate heat during high-speed write cycles, preventing junction temperature exceedance; and (2) it ensures mechanical stability and solder joint reliability in vibration-prone applications such as automotive and industrial controls.