M95256WMN6 STMicroelectronics Integrated Circuit (Small Outline Packages) In Stock
M95256WMN6 is a 256 Kbit (32 Kbyte) SPI serial EEPROM from STMicroelectronics with 60 ns access time and a 2.5 V to 5.5 V wide supply range in an 8-pin SOIC package. It supports byte and page write operations with built-in write protection and hardware write-protect pin. Available from stock worldwide with fast shipping.
- Manufacturer
- STMicroelectronics
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- M95256WMN6 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of M95256WMN6?
- 256 Kbit (32 Kbyte) SPI serial EEPROM with 60 ns maximum read access time for fast non-volatile data storage
- Wide supply voltage range of 2.5 V to 5.5 V enables use in both 3.3 V and 5 V embedded systems without level shifting
- Hardware write-protect (WP) pin and software write-protection registers prevent accidental data corruption in critical parameter storage
- Standard 8-pin SOIC package with SPI interface simplifies PCB design and firmware integration across any microcontroller platform
What is M95256WMN6 used for?
M95256WMN6 is used in embedded systems requiring reliable non-volatile storage of configuration parameters, calibration data, and event logs, such as industrial controllers, smart meters, and consumer appliances. Its wide 2.5 V to 5.5 V supply range and SPI interface make it compatible with virtually any microcontroller family, including low-power ARM Cortex-M and 8-bit PIC devices. The 32 Kbyte capacity suits applications needing more storage than internal MCU EEPROM but without the complexity of NAND flash management.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the M95256WMN6 datasheet?
M95256WMN6 Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for M95256WMN6?
Compatible alternatives and drop-in replacements for M95256WMN6:
Frequently Asked Questions
What is the capacity and access time of M95256WMN6, and how does it connect to a microcontroller?
M95256WMN6 provides 256 Kbit (32 Kbyte) of non-volatile EEPROM storage with a 60 ns maximum read access time over its SPI interface. It connects to a microcontroller using 4 SPI signals (SCK, SI, SO, CS) plus an optional WP write-protect pin, making integration straightforward on any MCU with a hardware SPI peripheral operating from 2.5 V to 5.5 V.
Over what supply voltage range does M95256WMN6 operate, and can it be used in a 3.3 V system alongside a 5 V bus?
M95256WMN6 operates across a supply voltage range of 2.5 V to 5.5 V, which covers both 3.3 V and 5 V system designs without requiring external level-shifting circuitry. This makes it directly compatible with 3.3 V ARM Cortex-M MCUs, 5 V AVR microcontrollers, and mixed-voltage embedded systems, simplifying the BOM and PCB design for multi-voltage industrial and consumer products.
How does the hardware write-protect feature of M95256WMN6 prevent accidental data loss in a calibration storage application?
The WP (write-protect) pin of M95256WMN6 can be tied high to enable hardware write protection, which prevents any write operation from modifying the EEPROM content even if a software bug issues an unintended write command. Additionally, the status register supports software-controlled block protection for quarter, half, or full array protection, providing two layers of defense for critical calibration constants, firmware version records, or configuration data in industrial controllers and smart metering devices.
For a design storing 20 Kbytes of event log data, is M95256WMN6's 32 Kbyte capacity a practical choice over using a larger SPI flash device?
Yes, M95256WMN6's 32 Kbyte capacity can accommodate a 20 Kbyte event log with 12 Kbytes remaining for configuration and system parameters. Unlike a larger SPI NOR flash device that requires dedicated erase cycles of 4 Kbyte or 64 Kbyte sectors before each write, the EEPROM architecture of M95256WMN6 allows byte-level overwrites with a typical 5 ms write cycle time, eliminating the erase-before-write step and simplifying firmware in low-frequency log write applications.
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Why Buy from FindMyChip
About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
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