SST39WF400B-70-4I-B3KE-T

Memory IC Overview

The SST39WF400B-70-4I-B3KE-T is a 4 Mbit (256K x 16) Multi-Purpose Flash manufactured using SuperFlash technology. It operates on a single 1.65V to 1.95V power supply for both read and write operations. The device features a 70 ns access time, uniform 2 KWord sectors, and uniform 32 KWord blocks. It is housed in a 48-ball TFBGA package measuring 6mm by 8mm.

Memory IC Feature Summary

• SuperFlash technology provides superior reliability with split-gate cell design and thick-oxide tunneling injector.
• Supports sector, block, and chip erase capabilities with automatic write timing and internal Vpp generation.
• Includes hardware and software data protection schemes to prevent inadvertent writes.
• Conforms to JEDEC standard pin assignments and command sets for x16 memories.

Memory IC Applications

• System applications requiring economical updating of program, configuration, or data memory.
• Embedded systems utilizing SuperFlash technology for improved performance and lower power consumption.
• Applications demanding high endurance and long data retention characteristics.

Memory IC Procurement Notes

Verify the specific suffix B3KE corresponds to the 48-ball TFBGA package and industrial temperature range (-40°C to +85°C). Confirm that the -T suffix indicates tape and reel packaging if required for assembly processes. Ensure compatibility with the 1.65V to 1.95V voltage domain for both programming and reading operations.

Memory IC Selection Notes

Select this component for designs requiring a single low-voltage supply for all operations. The 70 ns speed suits asynchronous parallel interfaces. Consider the 48-ball TFBGA footprint constraints. Verify that the system supports the required six-byte command sequences for erase operations and three-byte sequences for program operations.

Memory IC Part Context

This part belongs to the SST39WF400B series of 4 Mbit Multi-Purpose Flash memories. It utilizes Microchip's proprietary SuperFlash process, which offers better reliability compared to alternative approaches. The device is designed for surface mount applications and supports standard JEDEC pinouts.

Memory IC Replacement Considerations

SST39VF400A-70-4I-B3KE-T

Memory IC FAQ

How does the SST39WF400B detect the completion of a Program or Erase operation?

The device uses two software methods: Data# Polling on DQ7 and Toggle Bit monitoring on DQ6 to indicate when the internal operation is complete.

What is the typical endurance rating for this flash memory?

The device has a guaranteed typical endurance of 100,000 cycles and data retention rated at greater than 100 years.