AT45DB161D-SU Equivalent & Substitute Parts

Part Overview

The AT45DB161D-SU 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 66 MHz with a supply voltage range of 2.7V to 3.6V and is rated for -40°C to 85°C operating temperature. The part is classified as obsolete, making substitute components necessary for new designs and ongoing production support.

Substiute Parts

AT45DB161D-SU

Renesas Electronics CorporationIn Stock: 15323AT45DB161D-SU Datasheet

Current PartRFQ

AT45DB161E-SHD-B

Renesas Electronics CorporationIn Stock: 1840AT45DB161E-SHD-B Datasheet

MFR RecommendedRFQ

AT45DB161E-SHF-B

Renesas Electronics CorporationIn Stock: 20437AT45DB161E-SHF-B Datasheet

MFR RecommendedRFQ

AT45DB161E-SHFHA-T

Renesas Electronics CorporationIn Stock: 2104AT45DB161E-SHFHA-T Datasheet

MFR RecommendedRFQ

AT45DB161E-SHFHC-T

Renesas Electronics CorporationIn Stock: 1187AT45DB161E-SHFHC-T Datasheet

MFR RecommendedRFQ

AT45DQ161-SHF-B

Renesas Electronics CorporationIn Stock: 1104AT45DQ161-SHF-B Datasheet

MFR RecommendedRFQ

AT45DQ161-SHFHD-T

Renesas Electronics CorporationIn Stock: 3190AT45DQ161-SHFHD-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AT45DB161D-SU is determined by the following critical parameters:

• Memory capacity (16Mbit) and organization (528 Bytes x 4096 pages)
• Package type (8-SOIC with 5.30mm width)
• Memory interface compatibility (SPI protocol)
• Voltage supply range compatibility
• Operating temperature range
• Physical pin configuration and footprint

Substitute parts must maintain identical memory organization and package footprint to ensure direct replacement without PCB redesign. The AT45DB161D-SU operates at 66 MHz; substitute parts operating at higher clock frequencies (85 MHz) are backward compatible as they support the lower frequency operation of the original design. Voltage supply range compatibility is verified for each substitute to ensure operation within the original design specifications.

Parameter Comparison

Engineering Selection Recommendations

For direct replacement of the AT45DB161D-SU in existing designs, the AT45DB161E series parts (AT45DB161E-SHF-B, AT45DB161E-SHFHA-T, AT45DB161E-SHFHC-T) are the primary substitutes. These parts maintain standard SPI interface compatibility and are classified as Active products with ROHS3 compliance and improved moisture sensitivity ratings (MSL 1).

The AT45DB161E-SHF-B is recommended for new designs due to its Active product status, wider voltage supply range (2.3V ~ 3.6V), and improved reliability characteristics. This part is available in Tube packaging with the highest inventory level (20,400 pcs).

The AT45DQ161 series (AT45DQ161-SHF-B, AT45DQ161-SHFHD-T) offers extended operating temperature range (-40°C ~ 105°C) and Quad I/O interface capability. These parts are suitable for applications requiring higher temperature operation or quad SPI protocol support, though they require firmware compatibility verification for quad mode operation.

All substitute parts share identical memory capacity, organization, and 8-SOIC package footprint, enabling direct PCB replacement without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can AT45DB161E series parts directly replace the AT45DB161D-SU without firmware changes?

A: Yes. The AT45DB161E series maintains full SPI protocol compatibility with the AT45DB161D-SU. The higher clock frequency (85 MHz vs. 66 MHz) is backward compatible, allowing operation at the original design frequency. No firmware modifications are required for standard SPI mode operation.

Q: What is the difference between AT45DB161E and AT45DQ161 parts?

A: The AT45DB161E series operates in standard SPI mode only. The AT45DQ161 series supports both standard SPI and Quad I/O (SPI-QIO) modes, enabling higher data throughput when the application firmware supports quad mode commands. Both maintain identical memory capacity and 8-SOIC package footprint.

Q: Are the AT45DQ161 parts suitable for the same applications as AT45DB161D-SU?

A: Yes, for standard SPI operation. The AT45DQ161 parts operate in standard SPI mode by default and are fully compatible with existing firmware. The quad I/O capability is an additional feature that requires explicit firmware support to activate. The extended operating temperature range (-40°C ~ 105°C) makes these parts suitable for applications requiring higher temperature operation.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in three packaging formats: Tube (standard packaging), Cut Tape & Digi-Reel (CT), and Tape & Reel (TR). All maintain identical 8-SOIC physical dimensions and pin configuration. Selection depends on production volume and assembly line requirements.

Q: How does the voltage supply range affect part selection?

A: The AT45DB161D-SU operates at 2.7V ~ 3.6V. All substitute parts support this range with extended lower limits (2.3V ~ 3.6V or 2.5V ~ 3.6V), ensuring compatibility with the original design. The wider voltage range of substitute parts provides additional design margin without requiring circuit modifications.

Q: What is the significance of the MSL (Moisture Sensitivity Level) rating change?

A: The AT45DB161D-SU has MSL 3 (168 hours), while all substitute parts have MSL 1 (unlimited). MSL 1 indicates superior moisture resistance and eliminates the need for bake-out procedures before soldering, reducing manufacturing complexity and improving reliability in humid environments.