AT25DF256-SSHN-B Equivalent & Substitute Parts

Part Overview

The AT25DF256-SSHN-B is a 256Kbit Serial Peripheral Interface (SPI) FLASH memory IC manufactured by Renesas Electronics Corporation. This non-volatile memory device operates at 104 MHz with a supply voltage range of 1.65V to 3.6V and is housed in an 8-SOIC surface mount package. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). Finding equivalent substitute parts is necessary when the tube packaging format is unavailable or when alternative inventory sources are required while maintaining identical electrical and mechanical specifications.

Key Parameters

Parameter	Value
Memory Size	256Kbit
Memory Organization	32K x 8
Memory Interface	SPI
Clock Frequency	104 MHz
Write Cycle Time (Word/Page)	8µs / 2.5ms
Supply Voltage Range	1.65V ~ 3.6V
Operating Temperature Range	-40°C ~ 85°C
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the AT25DF256-SSHN-B is determined by strict equivalence across all electrical and mechanical parameters. The primary differentiator between the main part and its substitute is the packaging format. Both parts share identical core specifications: 256Kbit memory capacity, 32K x 8 organization, SPI interface, 104 MHz clock frequency, identical write cycle times, matching voltage supply range (1.65V ~ 3.6V), and the same operating temperature range (-40°C ~ 85°C). Both are housed in the 8-SOIC package with identical physical dimensions (0.154", 3.90mm Width). The substitute part AT25DF256-SSHN-T differs only in its packaging format (Tape & Reel instead of Tube), making it a direct functional equivalent for applications where packaging configuration does not impose constraints.

Parameter Comparison

Parameter	AT25DF256-SSHN-B (Main Part)	AT25DF256-SSHN-T (Substitute)
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation
Memory Size	256Kbit	256Kbit
Memory Organization	32K x 8	32K x 8
Memory Interface	SPI	SPI
Clock Frequency	104 MHz	104 MHz
Write Cycle Time (Word)	8µs	8µs
Write Cycle Time (Page)	2.5ms	2.5ms
Supply Voltage Range	1.65V ~ 3.6V	1.65V ~ 3.6V
Operating Temperature Range	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount
Packaging Format	Tube	Tape & Reel (TR)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active

Engineering Selection Recommendations

Both AT25DF256-SSHN-B and AT25DF256-SSHN-T are active production parts from Renesas Electronics Corporation with identical ROHS3 compliance and REACH unaffected status. Selection between these parts should be based solely on packaging requirements and inventory availability. The AT25DF256-SSHN-B in tube packaging is suitable for lower-volume applications or manual component handling workflows. The AT25DF256-SSHN-T in Tape & Reel format is optimized for automated assembly processes and higher-volume production runs. Both parts carry the same ECCN (EAR99) and HTSUS (8542.32.0071) classifications, ensuring equivalent regulatory treatment. No electrical or thermal performance differences exist between these parts.

Frequently Asked Questions (FAQ)

Q: Can AT25DF256-SSHN-T be used as a direct replacement for AT25DF256-SSHN-B in existing designs?

A: Yes. Both parts are electrically and mechanically identical. The only difference is packaging format (Tube versus Tape & Reel). No circuit modifications or design changes are required.

Q: Are there any performance differences between the tube and Tape & Reel versions?

A: No. Both versions have identical electrical specifications, including memory capacity, clock frequency, write cycle times, voltage range, and operating temperature range.

Q: What is the significance of the packaging format difference?

A: Packaging format affects handling and assembly processes. Tube packaging is typically used for manual or low-volume applications. Tape & Reel packaging is designed for automated pick-and-place assembly equipment used in high-volume manufacturing.

Q: Do both parts meet the same compliance standards?

A: Yes. Both AT25DF256-SSHN-B and AT25DF256-SSHN-T are ROHS3 compliant, REACH unaffected, and carry the same ECCN and HTSUS classifications.

Q: Is there a difference in moisture sensitivity between these parts?

A: No. Both parts have Moisture Sensitivity Level 1 (Unlimited), indicating no special moisture handling precautions are required during storage or assembly.

Q: Which part should be selected for high-volume production?

A: AT25DF256-SSHN-T (Tape & Reel) is the standard choice for high-volume automated assembly. AT25DF256-SSHN-B (Tube) is suitable for lower-volume or manual assembly scenarios.

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