STMicroelectronics M95320-WDW6TP

Overview

M95320-WDW6TP from STMicroelectronics is a 32-Kbit serial SPI bus EEPROM organized as 4096 × 8 bits, operating across 2.5 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 offers quarter/half/whole array write protection via Status Register BP1/BP0 bits. Used for firmware parameter storage in industrial control modules requiring nonvolatile configuration retention.

For engineers reviewing the M95320-WDW6TP datasheet, M95320-WDW6TP pinout, M95320-WDW6TP application, or M95320-WDW6TP equivalent, key selection considerations include its SO8 (150-mil) ECOPACK2® package, SPI Mode 0/3 compatibility, 4 million write cycles, 200-year data retention, and dedicated Write Protect (W) and Hold (HOLD) control terminals.

Technical Context

This SPI EEPROM implements a synchronous serial interface with CPOL=0/CPHA=0 and CPOL=1/CPHA=1 mode support, using rising-edge sampling on D and falling-edge output on Q. Its internal architecture includes an address register, page decoder, status register (WIP, WEL, BP1/BP0, SRWD), and ECC-enabled cycling logic for enhanced reliability.

Write operations require explicit WREN instruction followed by WRITE command; status polling via RDSR is mandatory before subsequent commands. The device features hardware-based write lock control through the W pin and suspend/resume capability via HOLD, enabling deterministic timing control during multi-device SPI bus arbitration.

Key Specifications

Pinout & Package

Package: SO8 (ECOPACK2®), 150-mil body width, surface-mount plastic small outline. Pin-1 marked by notch or dot; lead finish is matte tin.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT25320B-SSHL-T and BR24G32FJ-3GE2, M95320-WDW6TP uniquely balances 20 MHz operation across full 2.5–5.5 V range, integrated HOLD control, and 4M-cycle endurance-making it optimal for real-time industrial controllers needing robust, interrupt-tolerant configuration storage.

Availability

M95320-WDW6TP is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply with guaranteed long-term manufacturability.

Supply support for M95320-WDW6TP 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.

M95320-WDW6TP belongs to ST's serial EEPROM product line engineered for high-reliability, low-power, SPI-based nonvolatile storage in space-constrained embedded systems with stringent data integrity requirements.

FAQ

What SPI modes does M95320-WDW6TP support?

M95320-WDW6TP supports SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1). In both modes, data is latched on the rising edge of Serial Clock (C) and output on the falling edge. The difference lies 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 external protocol adaptation.

How is write protection configured on M95320-WDW6TP?

Write protection is controlled by two nonvolatile bits (BP1, BP0) in the Status Register, defining quarter, half, or full memory array lock. The Write Protect (W) pin provides hardware-level freeze: when W is held low, BP1/BP0 values become immutable until W is raised. Protection is enforced at the instruction decode stage-WRITE commands to locked regions are ignored, and RDSR confirms lock status via BP bits.

Does M95320-WDW6TP require external pull-up resistors on SPI lines?

Yes: Chip Select (S) requires a pull-up resistor (typically 10–100 kΩ) to VCC to prevent unintended selection during MCU reset or high-impedance states. Serial Clock (C) needs a pull-down resistor if the host may float all SPI lines simultaneously, ensuring C stays low while S is pulled high-this satisfies tSHCH timing and avoids spurious instruction latching during power transitions.

Can M95320-WDW6TP operate reliably at 2.5 V supply?

Yes: M95320-WDW6TP is fully specified for 2.5 V to 5.5 V operation per its "W" suffix variant. At 2.5 V, it maintains 20 MHz max clock, ≤5 ms write time, and full -40°C to +85°C temperature range functionality. DC parameters-including VIH/VIL thresholds and output drive strength-are validated down to 2.5 V, enabling direct integration into low-voltage industrial sensor nodes without level shifters.