AT45DQ161-SHD-B Equivalent & Substitute Parts

Part Overview

The AT45DQ161-SHD-B is a 16Mbit FLASH memory IC manufactured by Renesas Electronics Corporation, featuring SPI Quad I/O interface capability with 85 MHz clock frequency in an 8-SOIC surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design requirements and production needs.

Key Parameters

Parameter	Value
Memory Size	16Mbit
Memory Format	FLASH
Memory Organization	528 Bytes x 4096 pages
Memory Interface	SPI - Quad I/O
Clock Frequency	85 MHz
Write Cycle Time (Page)	6ms
Voltage Supply Range	2.5V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.209", 5.30mm Width)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AT45DQ161-SHD-B is determined by the following critical parameters:

Memory Capacity: 16Mbit (non-negotiable)
Memory Format & Technology: FLASH (non-negotiable)
Memory Organization: 528 Bytes x 4096 pages (non-negotiable)
Package / Case: 8-SOIC form factor (non-negotiable)
Mounting Type: Surface Mount (non-negotiable)
Clock Frequency: 85 MHz (non-negotiable)
Voltage Supply Range: Minimum 2.5V support required
Operating Temperature Range: Minimum -40°C to 85°C required
RoHS Compliance: ROHS3 Compliant (non-negotiable)

Substitute parts are grouped into two categories based on memory interface capability:

Category A - SPI Quad I/O Interface (Direct functional equivalent):

AT45DQ161-SHFHD-T

Category B - SPI Interface (Reduced interface capability):

AT45DB161E-SHD-B
AT45DB161E-SHF-B
AT45DB161E-SHFHA-T

Parameter Comparison

Parameter	AT45DQ161-SHD-B (Main)	AT45DQ161-SHFHD-T	AT45DB161E-SHD-B	AT45DB161E-SHF-B	AT45DB161E-SHFHA-T
Memory Size	16Mbit	16Mbit	16Mbit	16Mbit	16Mbit
Memory Format	FLASH	FLASH	FLASH	FLASH	FLASH
Memory Organization	528 Bytes x 4096 pages	528 Bytes x 4096 pages	528 Bytes x 4096 pages	528 Bytes x 4096 pages	528 Bytes x 4096 pages
Memory Interface	SPI - Quad I/O	SPI - Quad I/O	SPI	SPI	SPI
Clock Frequency	85 MHz	85 MHz	85 MHz	85 MHz	85 MHz
Write Cycle Time (Page)	6ms	6ms	4ms	4ms	4ms
Voltage Supply Range	2.5V ~ 3.6V	2.3V ~ 3.6V	2.5V ~ 3.6V	2.3V ~ 3.6V	2.3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 105°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Discontinued	Active	Not For New Designs	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: AT45DQ161-SHFHD-T

This part maintains full functional equivalence with the AT45DQ161-SHD-B, preserving SPI Quad I/O interface capability. It is currently Active in product status and ROHS3 compliant. The extended operating temperature range (-40°C to 105°C) provides additional thermal margin. Packaging is Tape & Reel (TR) format.

Secondary Substitutes: AT45DB161E-SHF-B and AT45DB161E-SHFHA-T

These parts provide 16Mbit FLASH memory with identical memory organization and 85 MHz clock frequency in 8-SOIC packages. Both are Active in product status and ROHS3 compliant. However, they feature standard SPI interface instead of Quad I/O, reducing data throughput capability. AT45DB161E-SHF-B offers the highest inventory availability (20,400 pcs) and supports extended voltage range (2.3V ~ 3.6V). AT45DB161E-SHFHA-T is available in Cut Tape (CT) & Digi-Reel® packaging.

Alternative: AT45DB161E-SHD-B

This part meets all core memory specifications with standard SPI interface. Product status is Not For New Designs, limiting suitability for new development. Tube packaging is available.

Frequently Asked Questions (FAQ)

Q: Can AT45DB161E series parts directly replace the AT45DQ161-SHD-B?

A: AT45DB161E parts are mechanically and electrically compatible in 8-SOIC packages with identical memory capacity and organization. However, they feature standard SPI interface instead of SPI Quad I/O. Applications utilizing Quad I/O protocol require AT45DQ161-SHFHD-T for full compatibility.

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

A: SPI Quad I/O uses four data lines for simultaneous data transfer, doubling throughput compared to standard SPI which uses two data lines. Interface selection depends on application bandwidth requirements and firmware implementation.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all listed substitute parts are ROHS3 compliant, matching the original AT45DQ161-SHD-B compliance status.

Q: What packaging options are available for substitutes?

A: AT45DQ161-SHFHD-T is supplied in Tape & Reel (TR) format. AT45DB161E-SHF-B is available in Tube packaging. AT45DB161E-SHFHA-T is supplied in Cut Tape (CT) & Digi-Reel® format. AT45DB161E-SHD-B is available in Tube packaging.

Q: Does operating temperature range affect substitution eligibility?

A: All substitute parts meet the minimum -40°C to 85°C requirement. AT45DQ161-SHFHD-T extends to 105°C, providing additional thermal margin for high-temperature applications.

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

A: AT45DQ161-SHD-B and AT45DQ161-SHFHD-T specify 6ms page write time. AT45DB161E series parts specify 4ms page write time, representing faster write performance.

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