AT25DF161-SSH-B Equivalent & Substitute Parts

Part Overview

The AT25DF161-SSH-B is a 16Mbit SPI FLASH memory IC manufactured by Microchip Technology, packaged in 8-SOIC form factor. This device operates at 100 MHz clock frequency with a supply voltage range of 2.7V to 3.6V and is rated for -40°C to 85°C operating temperature. The product is currently obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, design updates, and component procurement.

Substiute Parts

AT25DF161-SSH-B

Microchip TechnologyIn Stock: 2139AT25DF161-SSH-B Datasheet

Current PartRFQ

W25Q16JVSNIQ

Winbond ElectronicsIn Stock: 169554W25Q16JVSNIQ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT25DF161-SSH-B is determined by the following critical parameters:

• Memory Capacity: 16Mbit (2M x 8 organization) — substitute must match exactly
• Package Type: 8-SOIC with identical physical dimensions (0.154", 3.90mm Width) — ensures PCB compatibility
• Supply Voltage: 2.7V ~ 3.6V — substitute must operate within this range
• Operating Temperature: -40°C ~ 85°C — substitute must support this thermal range
• Memory Interface: SPI protocol compatibility — substitute must support standard SPI operation
• Compliance: ROHS3 and REACH compliance maintained across substitutes

The W25Q16JVSNIQ meets all mandatory substitution criteria. While it offers enhanced specifications (133 MHz clock frequency, SPI-Quad I/O capability), these represent functional improvements that do not compromise backward compatibility with designs specified for the AT25DF161-SSH-B.

Parameter Comparison

Engineering Selection Recommendations

The W25Q16JVSNIQ is the qualified substitute for the AT25DF161-SSH-B based on the following factors:

• Compliance Alignment: Both devices maintain ROHS3 and REACH compliance, ensuring regulatory continuity
• Product Status: The W25Q16JVSNIQ is active in production, providing long-term availability and supply chain stability
• Electrical Compatibility: Identical supply voltage range (2.7V ~ 3.6V) and operating temperature range (-40°C ~ 85°C) ensure direct functional replacement
• Package Compatibility: Identical 8-SOIC package dimensions enable direct PCB substitution without layout modifications
• Protocol Compatibility: The W25Q16JVSNIQ supports standard SPI operation, maintaining backward compatibility with existing firmware and hardware interfaces

Frequently Asked Questions (FAQ)

Q: Can the W25Q16JVSNIQ be used as a direct replacement for the AT25DF161-SSH-B?

A: Yes. Both devices share identical memory capacity (16Mbit), package type (8-SOIC), supply voltage range (2.7V ~ 3.6V), and operating temperature range (-40°C ~ 85°C). The W25Q16JVSNIQ operates at a higher clock frequency (133 MHz vs. 100 MHz) and supports Quad I/O mode, but standard SPI operation is fully compatible with designs specified for the AT25DF161-SSH-B.

Q: Are there any PCB layout changes required when substituting the W25Q16JVSNIQ?

A: No. Both devices use the identical 8-SOIC package with matching physical dimensions (0.154", 3.90mm Width). No PCB modifications are necessary.

Q: What is the difference between the SPI and SPI-Quad I/O interfaces?

A: The AT25DF161-SSH-B operates exclusively in standard SPI mode. The W25Q16JVSNIQ supports both standard SPI and Quad I/O modes. In standard SPI mode, the W25Q16JVSNIQ functions identically to the AT25DF161-SSH-B. Quad I/O mode is an optional enhancement that requires firmware support and is not required for compatibility.

Q: Are supply voltage and temperature specifications identical?

A: Yes. Both devices operate within 2.7V to 3.6V supply voltage and -40°C to 85°C temperature range. No power supply or thermal management changes are required.

Q: What is the inventory status of the substitute part?

A: The W25Q16JVSNIQ is in active production with 169,476 pieces available in stock, ensuring reliable long-term availability compared to the obsolete AT25DF161-SSH-B.