BY25D40ASTIG(R)

Memory IC Overview

The BY25D40ASTIG(R) is a 4M-bit SPI NOR Flash memory by BYTe Semiconductor. It supports Standard and Dual SPI interfaces with clock rates up to 108MHz for Fast Read and Dual Output modes. Operating on a single 2.7V to 3.6V supply, it features flexible architecture with 4KB sectors and 32/64KB blocks. Key electrical parameters include 20mA maximum active current, 5uA power-down current, and 0.7ms typical page program time. The device offers software/hardware write protection and operates within -40°C to +85°C.

Memory IC Feature Summary

• Supports Dual SPI operation for high-speed data transfer using bidirectional I/O pins.
• Provides flexible memory protection via hardware /WP pin and software block protect bits.
• Includes Deep Power-Down mode for significantly reduced standby current consumption.
• Features built-in power-on reset and edge-sensitive chip select for reliable initialization.

Memory IC Applications

• Battery-powered devices requiring low standby power consumption
• Systems needing secure code execution from non-volatile memory
• Industrial applications operating in extended temperature ranges

Memory IC Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and temperature grade. Ensure compatibility with system voltage levels and SPI interface requirements before integration. Cross-reference the JEDEC ID or Manufacturer/Device ID codes to validate authenticity and correct revision level during component sourcing.

Memory IC Selection Notes

Select this component when a 4M-bit capacity is required with dual-data-rate read capabilities. It is suitable for designs needing robust write protection mechanisms and industrial temperature stability. Consider the available package options such as SOP8 or USON8 based on board space constraints and thermal management needs.

Memory IC Part Context

This part belongs to the BY25D40AS family of Serial Peripheral Interface NOR Flash memories. It is designed for general-purpose storage applications where fast read speeds and flexible protection schemes are essential. The device integrates standard SPI commands alongside enhanced dual-mode instructions to optimize data throughput.

Memory IC Replacement Considerations

Check for compatible parts within the same density class that support Dual SPI. Verify equivalent voltage ranges and package dimensions if substituting. Ensure the replacement device supports similar erase block sizes and protection bit configurations for direct functional interchangeability.

Memory IC FAQ

How does the Dual SPI mode improve performance?

Dual SPI mode allows data to be transferred at twice the rate of standard SPI by utilizing both SI and SO pins simultaneously for output during Fast Read operations.

What is the function of the /WP pin?

The /WP (Write Protect) pin provides hardware protection for the Status Register and Block Protect bits when driven low, preventing accidental modification of protection settings.