Part A
AT45DB321E-SHF-B
Adesto Technologies
- Lifecycle
- Active
- Stock
- 2389 Stückzahl
- Package
- SOIC-8
- Series
- Speicher
Replacement verdict
Not a drop-in replacement
The AT45DB321E-SHF-B and AT45DB011D-SHET-T are not drop-in replacements for one another. The AT45DB321E-SHF-B offers a 32-Mbit density in an 8-SOIC package, while the AT45DB011D-SHET-T provides only 1-Mbit in an 8-SOIC package, so the two devices differ fundamentally in memory capacity, page size, and interface clock rate. Designers must validate timing, command-set compatibility, and PCB layout before considering any substitution.
Different memory density
Different page size
Different clock frequency
Different command set
Parts at a glance
Part B
AT45DB011D-SHET-T
Adesto Technologies
- Lifecycle
- Active
- Stock
- 2526 Stückzahl
- Package
- SOIC-8
- Series
- Speicher
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AT45DB321E-SHF-B | AT45DB011D-SHET-T | Why it matters |
|---|---|---|---|
| Memory Density | 32 Mbit (4 MB) | 1 Mbit (128 KB) | Density determines total storage capacity; a 32x difference means these parts are not drop-in substitutes for firmware or data storage sizing. |
| Page Size | 512 bytes (standard) / 528 bytes (binary) | 256 bytes (standard) / 264 bytes (binary) | Page size affects write granularity and buffer programming; firmware page-addressing logic must match the device page size. |
| Number of Pages | 8192 pages | 512 pages | Page count combined with page size defines total addressable memory and the address map used by the host controller. |
| Maximum SPI Clock Frequency | 85 MHz | 66 MHz | SPI clock rate determines maximum data throughput; a slower device may bottleneck system performance if timing is critical. |
| Supply Voltage Range | 2.3 V to 3.6 V | 2.7 V to 3.6 V | Operating voltage range affects compatibility with low-voltage rails; the wider range of the 321E allows operation down to 2.3 V. |
| Package / Pin Count | 8-lead SOIC (0.208" body) | 8-lead SOIC (0.208" body) | Package and pinout must match for board-level interchangeability; both share the same 8-lead SOIC footprint here. |
| Interface Type | SPI (Serial Peripheral Interface) | SPI (Serial Peripheral Interface) | Both use SPI, so the host bus protocol is compatible, though command sets and addressing differ by density. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range confirms suitability for industrial environments; identical ratings mean equivalent thermal robustness. |
| SRAM Data Buffer Size | 2 x 512-byte buffers | 2 x 256-byte buffers | Dual SRAM buffers enable simultaneous 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 | AT45DB321E-SHF-B | AT45DB011D-SHET-T |
|---|---|---|
| Supplier | - | Dialog Semiconductor GmbH |
| Part Status | Active | Obsolete |
| Memory Type | Non-Volatile | Non-Volatile |
| Memory Format | FLASH | FLASH |
| Technology | FLASH | FLASH |
| Memory Size | 32Mb (528 Bytes x 8192 pages) | 1Mb (264 Bytes x 512 pages) |
| Memory Interface | SPI | SPI |
| Clock Frequency | 85 MHz | 66 MHz |
| Write Cycle Time - Word Page | 8µs, 4ms | 4ms |
| Voltage - Supply | 2.3V ~ 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 AT45DB321E-SHF-B and the AT45DB011D-SHET-T?
The AT45DB321E-SHF-B is a 32-Mbit (4-Mbyte) DataFlash device, while the AT45DB011D-SHET-T is a 1-Mbit (128-Kbyte) DataFlash device. They differ in density, page size, and interface configuration, so they are not drop-in replacements for each other.
What is the memory density and organization of each device?
The AT45DB321E-SHF-B provides 32 Mbits organized as 8,192 pages of 512 bytes (or 4,096 pages of 1,024 bytes in dual-page configuration). The AT45DB011D-SHET-T provides 1 Mbit organized as 512 pages of 264 bytes.
What package types do these two devices use?
The AT45DB321E-SHF-B is supplied in an 8-lead SOIC package (208-mil). The AT45DB011D-SHET-T is supplied in an 8-lead SOIC package (150-mil). The package body widths differ, so PCB land patterns are not identical.
What supply voltage range does each device support?
The AT45DB321E-SHF-B operates from 2.3 V to 3.6 V. The AT45DB011D-SHET-T operates from 2.7 V to 3.6 V. A design using the AT45DB011D-SHET-T at 2.5 V would not be compatible with the AT45DB321E-SHF-B's lower limit, but the reverse substitution is voltage-compatible.
What is the maximum SPI clock frequency for each part?
The AT45DB321E-SHF-B supports SPI clock frequencies up to 85 MHz. The AT45DB011D-SHET-T supports SPI clock frequencies up to 66 MHz. System timing budgets must be re-evaluated if substituting one for the other.
Are the command sets and pinouts compatible between the two devices?
Both devices use the Atmel DataFlash SPI command set and share a similar 8-lead pinout (SI, SO, SCK, CS, VCC, GND, plus RESET and WP on some variants). However, page size and density differences mean address lengths and page-boundary handling differ, so firmware must be adjusted when migrating between them.
Can the AT45DB321E-SHF-B be used as a direct replacement for the AT45DB011D-SHET-T?
No. Although both are SPI DataFlash devices, the density (32 Mbit vs 1 Mbit), page size (512/1,024 bytes vs 264 bytes), package width (208-mil vs 150-mil), and maximum clock (85 MHz vs 66 MHz) differ. A direct replacement requires PCB and firmware validation against the respective datasheets.