SST25VF040B-50-4C-S2AF-T

Memory IC Overview

The SST25VF040B-50-4C-S2AF-T is a 4-Mbit (512K x 8) SPI Serial Flash memory manufactured by Microchip Technology using SuperFlash technology. It operates on a single voltage supply of 2.7V to 3.6V and supports clock frequencies up to 50 MHz. The device features uniform 4-Kbyte sectors, 32-Kbyte blocks, and 64-Kbyte blocks for flexible erasure. It includes software write protection via block protection bits and a hardware hold pin. The component is housed in an 8-lead SOIC package with a commercial temperature range of 0°C to +70°C.

Memory IC Feature Summary

• SuperFlash technology provides high reliability with superior endurance and data retention capabilities compared to alternative flash approaches.
• SPI-compatible interface supports Mode 0 and Mode 3 operations with a maximum clock frequency of 50 MHz for high-speed data access.
• Flexible erase architecture allows sector, block, or full chip erasure with uniform sizes of 4 Kbytes, 32 Kbytes, and 64 Kbytes.
• Integrated write protection mechanisms include software block protection bits and a dedicated WP# pin to lock the status register.

Memory IC Applications

• Storage of firmware code and boot loaders in embedded systems
• Data logging applications requiring non-volatile storage
• Configuration storage for microcontroller-based devices

Memory IC Procurement Notes

Verify the specific ordering suffix matches the required package type and temperature grade. Confirm that the 'S2' designation corresponds to the 150-mil SOIC package variant as specified in the datasheet. Ensure the 'C' suffix aligns with the commercial operating temperature range requirements for the target application environment.

Memory IC Selection Notes

Select this component when a 4-Mbit capacity is required with SPI compatibility and high-speed read performance up to 50 MHz. Consider the SuperFlash technology for applications demanding enhanced reliability and lower power consumption during program and erase cycles. Verify that the 2.7V to 3.6V supply voltage range matches the system power rails.

Memory IC Part Context

This part belongs to the SST25VF series of SPI Serial Flash memories from Microchip Technology. The series utilizes proprietary SuperFlash technology to offer improved performance and reliability over standard flash technologies. The SST25VF040B specifically provides 4-Mbit density with flexible erase structures and comprehensive write protection features.

Memory IC Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.

Memory IC FAQ

How does the HOLD# pin function during serial communication?

The HOLD# pin pauses a serial sequence without resetting the device. It requires CE# to be active-low and synchronizes with the SCK signal to enter and exit the hold state.

What methods are available for end-of-write detection during AAI programming?

End-of-write detection can be achieved via hardware detection by reading the SO pin status, software detection by polling the BUSY bit in the STATUS register, or by waiting for the specified time period.

How is the Block Protection Lock-Down (BPL) feature controlled?

The BPL bit prevents further alteration of the block protection bits when set to '1'. This lock-down function is enabled when the WP# pin is driven low and the BPL bit is already set.