AT45DB161E-SSHD2B-T Equivalent & Substitute Parts

Part Overview

The AT45DB161E-SSHD2B-T 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 85 MHz with a supply voltage range of 2.5V to 3.6V and supports industrial temperature ranges from -40°C to 85°C. The part is classified as Not For New Designs, indicating it has reached end-of-life status. Equivalent and substitute parts are necessary for applications requiring continued component availability, improved product status, or enhanced operational specifications.

Key Parameters

Parameter	Value
Memory Size	16Mbit
Memory Format	FLASH
Memory Interface	SPI
Clock Frequency	85 MHz
Memory Organization	512 Bytes x 4096 pages
Write Cycle Time (Page)	4ms
Voltage Supply Range	2.5V ~ 3.6V
Operating Temperature	-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 eligibility is determined by the following critical parameters:

Memory Size: 16Mbit (mandatory match)
Memory Format: FLASH (mandatory match)
Clock Frequency: 85 MHz (mandatory match)
Package Type: 8-SOIC (mandatory match)
Mounting Type: Surface Mount (mandatory match)
RoHS Status: ROHS3 Compliant (mandatory match)

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

Category 1 - SPI Interface (Direct Functional Equivalent): AT45DB161E-SSHF2B-T maintains identical SPI interface specification with improved product status (Active) and lower minimum supply voltage (2.3V).

Category 2 - SPI/Quad I/O Interface (Enhanced Capability): AT45DQ161-SH2B-T, AT45DQ161-SSHF2B-T, AT45DQ161-SSHFHB-T, and AT45DQ161-SSHFHD-T provide SPI/Quad I/O dual-mode interface capability. These parts support both standard SPI and Quad I/O operation modes, offering backward compatibility with SPI-only applications while enabling higher-speed Quad I/O operation when supported by system design.

Parameter Comparison

Parameter	AT45DB161E-SSHD2B-T	AT45DB161E-SSHF2B-T	AT45DQ161-SH2B-T	AT45DQ161-SSHF2B-T	AT45DQ161-SSHFHB-T	AT45DQ161-SSHFHD-T
Memory Size	16Mbit	16Mbit	16Mbit	16Mbit	16Mbit	16Mbit
Memory Interface	SPI	SPI	SPI - Quad I/O	SPI - Quad I/O	SPI - Quad I/O	SPI - Quad I/O
Clock Frequency	85 MHz	85 MHz	85 MHz	85 MHz	85 MHz	85 MHz
Memory Organization	512 Bytes x 4096 pages	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
Write Cycle Time (Page)	4ms	4ms	6ms	6ms	6ms	6ms
Voltage Supply Range	2.5V ~ 3.6V	2.3V ~ 3.6V	2.5V ~ 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 ~ 85°C	-40°C ~ 105°C	-40°C ~ 105°C
Package Type	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Not For New Designs	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (SPI Interface Required): Select AT45DB161E-SSHF2B-T when the application requires strict SPI interface compatibility. This part is the closest functional equivalent with Active product status, ensuring long-term availability. The extended supply voltage range (2.3V minimum) provides improved flexibility for low-power applications.

For Enhanced Capability (Quad I/O Support): Select from the AT45DQ161 series when the system design supports Quad I/O operation. All AT45DQ161 variants maintain backward compatibility with SPI-only operation while enabling higher-speed Quad I/O modes. AT45DQ161-SSHF2B-T and AT45DQ161-SSHFHB-T offer the widest availability. AT45DQ161-SSHFHB-T and AT45DQ161-SSHFHD-T extend operating temperature to 105°C for industrial applications requiring enhanced thermal performance.

Packaging Consideration: AT45DB161E-SSHF2B-T and all AT45DQ161 variants specified with Tape & Reel (TR) packaging are optimized for high-volume production. AT45DQ161-SH2B-T is available in standard packaging for lower-volume requirements.

Frequently Asked Questions (FAQ)

Q: Can AT45DQ161 parts replace AT45DB161E-SSHD2B-T in existing designs? A: Yes. AT45DQ161 parts support full SPI interface backward compatibility. Existing SPI-only firmware operates without modification. Quad I/O functionality is optional and requires explicit firmware support to activate.

Q: What is the difference between AT45DQ161-SSHFHB-T and AT45DQ161-SSHFHD-T? A: Both parts support SPI/Quad I/O interface and -40°C to 105°C operating temperature. AT45DQ161-SSHFHD-T uses 528-byte page organization versus 512-byte pages in AT45DQ161-SSHFHB-T. Page organization affects memory addressing and must match application firmware expectations.

Q: Why does AT45DB161E-SSHF2B-T have a lower minimum supply voltage (2.3V) than the original part (2.5V)? A: The extended voltage range represents improved device characterization and manufacturing process refinement. Applications designed for 2.5V operation remain fully compatible.

Q: What is the impact of 6ms page write time in AT45DQ161 parts versus 4ms in the original? A: Page write time affects sequential write performance. For applications performing continuous page writes, the 2ms difference results in approximately 33% longer write duration per page. Verify application timing requirements before selection.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance, ensuring regulatory compatibility with AT45DB161E-SSHD2B-T.

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