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SST25VF040B

MCHPSST25VF040B

Microchip Technology
Legacy 4 Mbit SPI NOR (SST family) available from Microchip as an alternative with similar use cases.
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Overview

The Microchip SST25VF040B is a 4 Mbit (512K x 8) Serial Peripheral Interface (SPI) flash memory device. It offers a reliable, non-volatile storage solution with a maximum clock frequency of 50 MHz. Designed for general-purpose embedded applications, it operates from a 2.7V to 3.6V supply.

Why Choose This Part

This device offers a compact 8-pin SOIC package, making it suitable for space-constrained designs. Its SPI interface simplifies integration with most microcontrollers, and features like Auto Address Increment (AAI) Programming and End of Write Detection streamline flash operations. The inclusion of Hold Pin (HOLD#) and Write Protection (WP#) provides additional system control and data integrity.

Applications

Firmware Storage
Storing boot code, application firmware, or configuration data for microcontrollers and embedded processors.
Data Logging
Non-volatile storage for sensor readings, event logs, or other system data in industrial controls and consumer devices.
Code Shadowing
Copying code from the serial flash into RAM for faster execution in systems where RAM is the primary execution memory.
System Parameter Storage
Saving user settings, calibration data, or other persistent parameters in a variety of electronic products.

Key Specifications

Technology FLASH
Memory Size 4Mbit
Memory Type Non-Volatile
Memory Format FLASH
Mounting Type Surface Mount
Package / Case 8-SOIC (0.154", 3.90mm Width)
Clock Frequency 50 MHz
Memory Interface SPI
Voltage - Supply 2.7V ~ 3.6V
Memory Organization 512K x 8
Operating Temperature -40degC ~ 85degC (TA)
Supplier Device Package 8-SOIC
Write Cycle Time - Word, Page 10us

Getting Started

To get started with the SST25VF040B, engineers can typically interface it with any microcontroller supporting an SPI bus. Microchip's MPLAB X IDE and associated tools (such as PICkit or ICD programmers/debuggers) can be used when paired with a Microchip microcontroller. Example code libraries for SPI flash communication are commonly available from MCU vendors to facilitate integration.

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