AT25DN256-SSHF-B Equivalent & Substitute Parts

Part Overview

The AT25DN256-SSHF-B is a 256Kbit FLASH memory IC manufactured by Renesas Electronics Corporation, designed for SPI serial interface applications. This non-volatile memory device operates at 104 MHz and is packaged in an 8-SOIC surface mount configuration. The part is currently in active production status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Finding equivalent substitute parts may be necessary due to supply chain constraints, packaging format requirements, or specific application voltage range needs.

Substiute Parts

AT25DN256-SSHF-B

Renesas Electronics CorporationIn Stock: 862AT25DN256-SSHF-B Datasheet

Current PartRFQ

AT25DF256-SSHN-T

Renesas Electronics CorporationIn Stock: 8169AT25DF256-SSHN-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The AT25DF256-SSHN-T qualifies as a direct substitute for the AT25DN256-SSHF-B based on the following critical parameters:

• Memory Capacity & Organization: Both devices provide 256Kbit capacity in 32K x 8 organization
• Interface Protocol: Both implement SPI serial interface at 104 MHz clock frequency
• Physical Package: Both use 8-SOIC surface mount packaging with identical 0.154" (3.90mm) width
• Operating Temperature: Both support -40°C to 85°C operating range
• Compliance & Certifications: Both are RoHS3 compliant with MSL 1 rating and REACH unaffected status

The primary differences between these parts relate to packaging format (Tube vs. Tape & Reel) and voltage supply range specifications, which do not affect functional substitution in applications designed for the overlapping voltage window.

Parameter Comparison

Engineering Selection Recommendations

Both the AT25DN256-SSHF-B and AT25DF256-SSHN-T are active production devices from Renesas Electronics Corporation with identical RoHS3 compliance and REACH unaffected status. Selection between these parts should be based on:

Voltage Supply Range: The AT25DF256-SSHN-T supports a lower minimum supply voltage (1.65V vs. 2.3V), making it suitable for low-power applications. Applications requiring operation above 2.3V can use either part interchangeably.

Packaging Format: The AT25DN256-SSHF-B is supplied in Tube packaging, while the AT25DF256-SSHN-T is supplied in Tape & Reel format. Selection depends on assembly process requirements and volume considerations.

Page Write Cycle Time: The AT25DN256-SSHF-B offers faster page write performance (1.75ms vs. 2.5ms). Applications with strict write timing requirements should specify the AT25DN256-SSHF-B.

Both parts maintain identical memory capacity, interface protocol, clock frequency, and thermal operating range, ensuring functional compatibility in applications designed for either device.

Frequently Asked Questions (FAQ)

Q: Can the AT25DF256-SSHN-T replace the AT25DN256-SSHF-B in existing designs?

A: Yes, provided the application's supply voltage range is compatible. The AT25DF256-SSHN-T supports 1.65V to 3.6V, which encompasses the AT25DN256-SSHF-B range of 2.3V to 3.6V. Both devices share identical memory capacity, SPI interface, clock frequency, and package dimensions.

Q: What is the difference in page write cycle time between these parts?

A: The AT25DN256-SSHF-B completes page write operations in 1.75ms, while the AT25DF256-SSHN-T requires 2.5ms. For applications with time-critical write operations, the AT25DN256-SSHF-B provides faster performance.

Q: Are there packaging considerations when substituting these parts?

A: Yes. The AT25DN256-SSHF-B uses Tube packaging, while the AT25DF256-SSHN-T uses Tape & Reel format. Tube packaging is typically used for lower-volume or manual assembly processes, while Tape & Reel is standard for automated pick-and-place assembly. Verify your assembly equipment compatibility before substitution.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the AT25DN256-SSHF-B and AT25DF256-SSHN-T are RoHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity ratings. Both are active production devices from Renesas Electronics Corporation.

Q: Which part should I select for new designs?

A: For new designs, the AT25DF256-SSHN-T is recommended due to its wider supply voltage range (1.65V to 3.6V), which provides greater design flexibility for low-power applications. However, if page write speed is critical, the AT25DN256-SSHF-B's faster 1.75ms cycle time may be preferred.