Part A
AT45DB011D-SH-T
Adesto Technologies
- Lifecycle
- Active
- Stock
- 2586 PCS
- Package
- SOIC-8
- Series
- Memory
Replacement verdict
Compatible functional replacement candidate
The AT45DB011D-SSH-B is a compatible functional replacement candidate for the AT45DB011D-SH-T, sharing the same 1-Mbit DataFlash density, SPI interface, and page/sector architecture, with the primary distinction being the package and temperature grade. Designers should validate the package footprint and operating temperature range against the target application before substitution.
Memory Density & Organization
High match
Interface Type
High match
Package Type
Validation required
Operating Temperature Range
Validation required
Parts at a glance
Part B
AT45DB011D-SSH-B
Adesto Technologies
- Lifecycle
- Active
- Stock
- 9653 PCS
- Package
- SOIC-8
- Series
- Memory
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AT45DB011D-SH-T | AT45DB011D-SSH-B | Why it matters |
|---|---|---|---|
| Memory Type | Data Flash (NOR Flash) | Data Flash (NOR Flash) | Both are Data Flash devices, so the memory technology and command set are compatible for firmware and code storage. |
| Memory Size | 1 Mbit (128 Kbytes) | 1 Mbit (128 Kbytes) | Identical density ensures the same storage capacity for application code and data. |
| Organization | 264-byte pages, 512 pages | 264-byte pages, 512 pages | Matching page and sector organization allows identical read/write/erase routines and buffer usage. |
| Supply Voltage | 2.7 V to 3.6 V | 2.7 V to 3.6 V | Same operating voltage range means the parts are interchangeable in the same power rail design. |
| Interface | SPI (Serial Peripheral Interface) | SPI (Serial Peripheral Interface) | Both use SPI, so the host controller interface and firmware protocol remain unchanged. |
| Maximum Clock Frequency | 66 MHz | 66 MHz | Identical maximum SPI clock supports the same throughput and timing budget. |
| Package / Mounting | 8-SOIC (0.154", 3.90mm width), Surface Mount | 8-SOIC (0.154", 3.90mm width), Surface Mount | Package and footprint compatibility is required for direct board-level substitution; both share the same SOIC-8 outline. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | The temperature range must cover the target application environment; both are rated for industrial temperature operation. |
| Product Status / Packaging Suffix | Tape & Reel (T suffix) | Bulk / Tube (B suffix) | The suffix indicates packaging form; this affects manufacturing handling and reel-based assembly but not electrical function. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AT45DB011D-SH-T | AT45DB011D-SSH-B |
|---|---|---|
| Supplier | - | Dialog Semiconductor GmbH |
| 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) | 1Mb (264 Bytes x 512 pages) |
| Memory Interface | SPI | SPI |
| Clock Frequency | 66 MHz | 66 MHz |
| Write Cycle Time - Word Page | 4ms | 4ms |
| 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 AT45DB011D-SH-T and AT45DB011D-SSH-B?
Both are 1-Mbit (128-Kbyte) DataFlash serial memory devices from the AT45DB011D family. The primary difference is the package and temperature grade: the AT45DB011D-SH-T is supplied in an 8-lead SOIC (0.150" body) package, while the AT45DB011D-SSH-B is supplied in an 8-lead SOIC (0.208" body, EIAJ) package. The "-B" suffix on the SS version denotes a tube/tray shipping option versus tape-and-reel for the "-T" version. Both operate over the industrial temperature range of -40°C to +85°C.
Are the AT45DB011D-SH-T and AT45DB011D-SSH-B functionally interchangeable?
Functionally, both devices share the same 1-Mbit density, SPI-compatible serial interface, 264-byte page size, and command set. However, they are not drop-in replacements because the package body widths differ (0.150" vs 0.208"), which affects PCB land patterns and footprint compatibility. Designers must verify the package outline against their board layout before substitution.
What is the memory density and organization of these devices?
Both the AT45DB011D-SH-T and AT45DB011D-SSH-B provide 1 Mbit (1,048,576 bits) of serial flash memory, organized as 512 pages of 264 bytes each (128 Kbytes plus 8 Kbytes of SRAM buffer). The devices include two 264-byte SRAM data buffers to support continuous data streaming during page programming.
What supply voltage and interface do these devices require?
Both devices operate from a single 2.7V to 3.6V supply and use a serial peripheral interface (SPI) compatible with modes 0 and 3. The maximum clock frequency is 66 MHz for the AT45DB011D family, supporting rapid code and data downloads.
What are the operating temperature ranges for these parts?
Both the AT45DB011D-SH-T and AT45DB011D-SSH-B are specified for the industrial temperature range of -40°C to +85°C, making them suitable for embedded and industrial applications requiring extended thermal tolerance.
How do the package options affect PCB design?
The AT45DB011D-SH-T uses an 8-lead SOIC package with a 0.150" (3.90 mm) body width, while the AT45DB011D-SSH-B uses an 8-lead SOIC package with a 0.208" (5.30 mm) body width. The wider body of the SS version requires a different land pattern and occupies more board area, so the PCB footprint must be updated when switching between the two.
What does the shipping suffix "-T" versus "-B" indicate?
The "-T" suffix on the AT45DB011D-SH-T indicates tape-and-reel packaging, suitable for automated pick-and-place assembly. The "-B" suffix on the AT45DB011D-SSH-B indicates tube or tray packaging. This difference affects handling and inventory but not device functionality.
Can these devices be used in code-shadowing applications?
Yes. Both the AT45DB011D-SH-T and AT45DB011D-SSH-B support rapid active serial interface operation and dual SRAM buffers, which enable code shadowing to SRAM while a page is being reprogrammed in the main memory array. This makes them suitable for applications requiring continuous read access during firmware updates.