AT25DF161-SH-B Equivalent & Substitute Parts

Part Overview

The AT25DF161-SH-B is a 16Mbit Serial Peripheral Interface (SPI) FLASH memory IC manufactured by Renesas Electronics Corporation in an 8-SOIC surface mount package. This device operates at 100 MHz clock frequency with a supply voltage range of 2.7V to 3.6V and temperature range of -40°C to 85°C. The product is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations.

Substiute Parts

AT25DF161-SH-B

Renesas Electronics CorporationIn Stock: 1936AT25DF161-SH-B Datasheet

Current PartRFQ

SST25VF016B-50-4I-S2AF

Microchip TechnologyIn Stock: 41418SST25VF016B-50-4I-S2AF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

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

• Memory Capacity: 16Mbit (2M x 8 organization) - must match exactly
• Interface Protocol: SPI - must match exactly
• Package Type: 8-SOIC with identical physical dimensions (0.209", 5.30mm Width) - must match exactly
• Supply Voltage: 2.7V ~ 3.6V - must be compatible
• Operating Temperature Range: -40°C ~ 85°C - must be compatible or exceed
• Memory Type: Non-Volatile FLASH - must match exactly

The SST25VF016B-50-4I-S2AF meets all mandatory substitution criteria. While the clock frequency differs (50 MHz versus 100 MHz), this represents a functional downgrade rather than incompatibility, as the substitute operates at a lower maximum speed within the same SPI protocol and identical electrical specifications.

Parameter Comparison

Engineering Selection Recommendations

The SST25VF016B-50-4I-S2AF is the qualified substitute for the AT25DF161-SH-B based on the following factors:

• Product Availability: The main part is obsolete; the substitute is active and maintains 41,350 units in stock inventory
• Electrical Compatibility: Both devices operate within identical supply voltage (2.7V ~ 3.6V) and temperature ranges (-40°C ~ 85°C)
• Package Compatibility: Identical 8-SOIC package dimensions enable direct PCB footprint compatibility
• Memory Specifications: Matching 16Mbit capacity and 2M x 8 organization with SPI interface ensure functional equivalence
• Compliance Status: The substitute is RoHS3 compliant and REACH unaffected, meeting current regulatory requirements
• Programmable Verification: The substitute has been verified as programmable by DiGi-Electronics

The primary design consideration is the reduced clock frequency (50 MHz versus 100 MHz). Systems designed for the original 100 MHz specification will operate correctly with the 50 MHz substitute, though at reduced maximum data transfer rates. Write cycle times are slightly longer (10µs word versus 7µs), which may impact applications with strict timing requirements.

Frequently Asked Questions (FAQ)

Q: Can the SST25VF016B-50-4I-S2AF be used as a direct replacement for the AT25DF161-SH-B?

A: Yes. Both devices share identical memory capacity (16Mbit), organization (2M x 8), interface protocol (SPI), package type (8-SOIC), and electrical specifications (2.7V ~ 3.6V supply, -40°C ~ 85°C operating range). The substitute is pin-compatible and functionally equivalent for SPI FLASH memory applications.

Q: What is the impact of the 50 MHz clock frequency on the substitute part?

A: The SST25VF016B-50-4I-S2AF operates at a maximum clock frequency of 50 MHz compared to the original 100 MHz. This reduces the maximum SPI data transfer rate proportionally. Applications operating at or below 50 MHz will experience no functional difference. Systems requiring 100 MHz operation must be re-evaluated for timing compatibility.

Q: Are the package dimensions identical?

A: Yes. Both parts use the 8-SOIC package with identical physical dimensions (0.209" width, 5.30mm). PCB footprints, land patterns, and mounting procedures are identical.

Q: What are the differences in write cycle times?

A: The AT25DF161-SH-B specifies 7µs word write and 3ms page write cycles. The SST25VF016B-50-4I-S2AF specifies 10µs word write time. Page write time is not specified for the substitute. Applications with strict write timing requirements should account for the longer word write cycle.

Q: Is the substitute part currently available?

A: Yes. The SST25VF016B-50-4I-S2AF is an active product with 41,350 units in stock inventory, compared to the obsolete status of the original part.

Q: Are there compliance or certification differences?

A: The substitute is RoHS3 compliant and REACH unaffected. Both parts share identical moisture sensitivity level (MSL 3, 168 hours) and ECCN/HTSUS classifications. The substitute has been verified as programmable by DiGi-Electronics.