AT45DQ161-SSHD2B-T Equivalent & Substitute Parts

Part Overview

The AT45DQ161-SSHD2B-T is a 16Mbit FLASH memory IC manufactured by Renesas Electronics Corporation, featuring SPI Quad I/O interface capability and operating at 85 MHz. This device is designed for non-volatile data storage applications requiring high-speed serial access. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active product lines that maintain compatibility with existing designs.

Key Parameters

Parameter	Value
Memory Size	16Mbit
Memory Format	FLASH
Memory Organization	512 Bytes x 4096 pages
Memory Interface	SPI - Quad I/O
Clock Frequency	85 MHz
Voltage Supply Range	2.5V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	8-SOIC (0.154", 3.90mm Width)
Write Cycle Time - Page	6ms
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AT45DQ161-SSHD2B-T is determined by the following critical parameters:

Memory capacity (16Mbit)
Memory interface type (SPI - Quad I/O or SPI)
Package type (8-SOIC)
Supply voltage compatibility (minimum 2.5V support)
Operating temperature range (minimum -40°C to 85°C)
Clock frequency (85 MHz)

Substitute parts must maintain identical memory size, package footprint, and pin compatibility. Interface variations between SPI and SPI Quad I/O are permitted where the substitute supports the required protocol. Supply voltage ranges may be extended (lower minimum or higher maximum) without affecting substitution validity. Operating temperature ranges may be extended to higher maximum values. Page write cycle time variations are acceptable within the specified operational parameters.

Parameter Comparison

Parameter	AT45DQ161-SSHD2B-T (Main)	AT45DB161E-SSHF2B-T	AT45DQ161-SSHF2B-T	AT45DQ161-SSHFHB-T	AT45DQ161-SSHFHD-T
Memory Size	16Mbit	16Mbit	16Mbit	16Mbit	16Mbit
Memory Interface	SPI - Quad I/O	SPI	SPI - Quad I/O	SPI - Quad I/O	SPI - Quad I/O
Memory Organization	512 Bytes x 4096 pages	512 Bytes x 4096 pages	512 Bytes x 4096 pages	512 Bytes x 4096 pages	528 Bytes x 4096 pages
Clock Frequency	85 MHz	85 MHz	85 MHz	85 MHz	85 MHz
Write Cycle Time - Page	6ms	4ms	6ms	6ms	6ms
Voltage Supply Range	2.5V ~ 3.6V	2.3V ~ 3.6V	2.3V ~ 3.6V	2.3V ~ 3.6V	2.3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 105°C	-40°C ~ 105°C
Package Type	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Discontinued	Active	Active	Active	Active
Packaging	Tube	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)
Inventory Status	750 Pcs	7245 Pcs	11620 Pcs	4577 Pcs	1205 Pcs

Engineering Selection Recommendations

All four substitute parts are manufactured by Renesas Electronics Corporation and maintain ROHS3 compliance and REACH unaffected status, consistent with the original AT45DQ161-SSHD2B-T.

AT45DQ161-SSHF2B-T is the primary substitute, offering identical memory organization, interface type (SPI - Quad I/O), page write cycle time, and operating temperature range to the main part. This part is in active production with highest inventory availability (11620 Pcs).

AT45DQ161-SSHFHB-T and AT45DQ161-SSHFHD-T provide extended operating temperature ranges (-40°C to 105°C) and lower minimum supply voltage (2.3V), offering enhanced environmental performance. AT45DQ161-SSHFHD-T features 528-byte page organization versus the standard 512-byte format.

AT45DB161E-SSHF2B-T operates with standard SPI interface (non-Quad I/O) and faster page write cycle time (4ms versus 6ms). This part is suitable only where Quad I/O capability is not required by the application.

Frequently Asked Questions (FAQ)

Q: Can AT45DB161E-SSHF2B-T replace AT45DQ161-SSHD2B-T in all applications?

A: AT45DB161E-SSHF2B-T uses standard SPI interface instead of SPI Quad I/O. Substitution is valid only if the application does not require Quad I/O protocol support. Pin compatibility is maintained at the 8-SOIC package level.

Q: What is the difference between AT45DQ161-SSHFHD-T and other AT45DQ161 variants?

A: AT45DQ161-SSHFHD-T features 528-byte page organization (versus 512-byte standard) and extended operating temperature range to 105°C. All other electrical and interface parameters remain equivalent.

Q: Are all substitute parts available in Tape & Reel packaging?

A: Yes. All four substitute parts are supplied in Tape & Reel (TR) packaging, whereas the original AT45DQ161-SSHD2B-T was supplied in tube packaging. This affects handling and assembly processes but does not impact electrical compatibility.

Q: What is the minimum supply voltage requirement for substitute parts?

A: AT45DQ161-SSHF2B-T, AT45DQ161-SSHFHB-T, and AT45DQ161-SSHFHD-T support 2.3V minimum supply voltage, compared to 2.5V for the original part. AT45DB161E-SSHF2B-T also supports 2.3V minimum. All parts support 3.6V maximum.

Q: Which substitute offers the fastest page write performance?

A: AT45DB161E-SSHF2B-T provides 4ms page write cycle time, compared to 6ms for all other parts. This faster performance is available only with standard SPI interface.

Q: Are all substitute parts RoHS and REACH compliant?

A: Yes. All substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original part.

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