Part A
AT45DB011D-SH-T
Technologie adesto
- Lifecycle
- Active
- Stock
- 2586 PCS
- Package
- SOIC-8
- Series
- Mémoire
Replacement verdict
Not a drop-in replacement
The AT45DB161D-SU and AT45DB011D-SH-T are both DataFlash serial memory devices, but they differ fundamentally in density, package, and interface configuration, so the AT45DB011D-SH-T cannot serve as a direct drop-in substitute for the AT45DB161D-SU. The 16-Mbit device offers eight times the storage capacity of the 1-Mbit part, and the two devices use different package and pin-count configurations, requiring board-level redesign rather than a simple swap.
Different memory density
Different package type
Different pin count
Different page size
Parts at a glance
Part B
AT45DB161D-SU
Technologie adesto
- Lifecycle
- Active
- Stock
- 6030 PCS
- Package
- SOIC-8
- Series
- Mémoire
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AT45DB161D-SU | AT45DB011D-SH-T | Why it matters |
|---|---|---|---|
| Memory Density | 16 Mbit (2 MB) | 1 Mbit (128 KB) | Density determines total storage capacity; a 16x difference means the parts are not drop-in substitutes for the same firmware image or data set. |
| Page Size | 512 bytes (528 bytes with ECC) | 256 bytes (264 bytes with ECC) | Page size affects write/read buffering and firmware addressing; mismatched page sizes require code changes for program and read operations. |
| Number of Pages | 4096 pages | 512 pages | Page count combined with page size defines total array organization and the addressable range used by the host controller. |
| Interface Type | SPI (Serial Peripheral Interface) | SPI (Serial Peripheral Interface) | Both use SPI, so bus signaling is compatible, but command sets and addressing widths still differ due to density. |
| Supply Voltage | 2.7 V to 3.6 V | 2.7 V to 3.6 V | Operating voltage range must match the host system rails; identical ranges mean power supply compatibility is maintained. |
| Maximum Clock Frequency | 66 MHz | 66 MHz | Clock rate determines maximum throughput; matching frequencies means timing budgets for the SPI bus remain valid. |
| Package / Mounting | 8-SOIC (0.209", 5.30mm width), Surface Mount | 8-SOIC (0.154", 3.90mm width), Surface Mount | Package footprint and body width affect PCB layout; different SOIC widths may require board redesign even though pin count matches. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Temperature range must cover the application environment; identical industrial ranges mean environmental compatibility is preserved. |
| Organization | 2 SRAM data buffers (512 bytes each) | 2 SRAM data buffers (256 bytes each) | Dual SRAM buffers enable concurrent read-while-write; buffer size scales with page size and affects streaming performance. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AT45DB011D-SH-T | AT45DB161D-SU |
|---|---|---|
| Part Status | Obsolete | Obsolete |
| Memory Type | Non-Volatile | Non-Volatile |
| Memory Format | FLASH | FLASH |
| Technology | FLASH | FLASH |
| Memory Size | 1Mb (264 Bytes x 512 pages) | 16Mb (528 Bytes x 4096 pages) |
| Memory Interface | SPI | SPI |
| Clock Frequency | 66 MHz | 66 MHz |
| Write Cycle Time - Word Page | 4ms | 6ms |
| Voltage - Supply | 2.7V ~ 3.6V | 2.7V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C (TC) | -40°C ~ 85°C (TC) |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the AT45DB161D-SU and AT45DB011D-SH-T?
The AT45DB161D-SU is a 16-Mbit (2-Mbyte) DataFlash memory device, while the AT45DB011D-SH-T is a 1-Mbit (128-Kbyte) device. They differ in density, page size, and package: the AT45DB161D-SU uses a 8-mm x 5-mm 8-lead SOIC (0.208" body), and the AT45DB011D-SH-T uses an 8-lead SOIC (0.150" body). Both are SPI-compatible serial flash memories from the same DataFlash family.
Are the AT45DB161D-SU and AT45DB011D-SH-T pin-compatible?
No. Although both are 8-lead SOIC devices with a similar SPI pinout (SI, SO, SCK, CS, RESET, VCC, GND, WP), the AT45DB161D-SU is supplied in a 0.208"-wide SOIC-8 package and the AT45DB011D-SH-T in a 0.150"-wide SOIC-8 package. The package body widths and PCB land patterns differ, so they are not drop-in replacements without layout changes.
Can the AT45DB011D-SH-T be used as a direct substitute for the AT45DB161D-SU?
No. The AT45DB011D-SH-T has only 1 Mbit of density versus 16 Mbit for the AT45DB161D-SU, so it cannot hold the same data volume. In addition, the page size differs (the AT45DB011D uses 264-byte pages, while the AT45DB161D uses 528-byte pages), and the package footprint is different. Substitution requires firmware and hardware redesign.
What are the supply voltage and interface requirements for these devices?
Both the AT45DB161D-SU and AT45DB011D-SH-T operate from a single 2.7 V to 3.6 V supply and use a Serial Peripheral Interface (SPI) compatible bus supporting Mode 0 and Mode 3. They are not 5 V tolerant, so level shifting is required when interfacing with 5 V logic.
Do both devices support page erase and sector erase operations?
Yes. Both devices support page erase, block erase, and chip erase operations, as well as page program and buffer write. The AT45DB161D-SU has 4096 pages of 528 bytes each, organized into 32 sectors of 128 pages, while the AT45DB011D-SH-T has 512 pages of 264 bytes each, organized into 4 sectors of 128 pages.
What is the maximum SPI clock frequency for the AT45DB161D-SU and AT45DB011D-SH-T?
Both devices support a maximum SPI clock frequency of 66 MHz for read operations, with page program and erase operations requiring the standard command timing. The maximum frequency is specified in the respective manufacturer datasheets and applies to both devices under the rated supply voltage range.
Are these devices suitable for code shadowing and data logging applications?
Yes. Both are DataFlash serial memories designed for code shadowing to RAM, data logging, and firmware storage. The AT45DB161D-SU is better suited to larger firmware images and data logs due to its 16-Mbit density, while the AT45DB011D-SH-T is appropriate for smaller code or parameter storage where 1 Mbit is sufficient.