Part A
AT45DB081D-SU
Technologie adesto
- Lifecycle
- Active
- Stock
- 5537 PCS
- Package
- SOIC-8
- Series
- Mémoire
Replacement verdict
Compatible functional replacement candidate
The AT45DB011D-SHET-T is a lower-density member of the same DataFlash family as the AT45DB081D-SU, sharing the identical SOIC-8 footprint, SPI interface, and 2.7V–3.6V supply range, so it can serve as a functional substitute where 1-Mbit density is sufficient. However, the 8-Mbit AT45DB081D-SU cannot be replaced by the 1-Mbit device in applications requiring the larger array, and the differing page size and clock-rate specifications must be validated against the host firmware and timing budget before substitution.
Memory Density
Not compatible
Package Type
High match
Supply Voltage Range
High match
Page Size and Clock Frequency
Validation required
Parts at a glance
Part B
AT45DB011D-SHET-T
Technologie adesto
- Lifecycle
- Active
- Stock
- 2526 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 | AT45DB081D-SU | AT45DB011D-SHET-T | Why it matters |
|---|---|---|---|
| Memory Density | 8 Mbit | 1 Mbit | Density determines total storage capacity; an 8 Mbit device holds eight times the data of a 1 Mbit device, so they are not drop-in substitutes for capacity-critical designs. |
| Page Size | 264 bytes (page program) | 264 bytes (page program) | Page size affects write granularity and buffer usage; matching page sizes simplifies firmware porting between the two parts. |
| Number of Pages | 4096 pages | 512 pages | Page count combined with page size defines total array size and address range; different counts require different addressing in firmware. |
| Interface Type | SPI (Serial Peripheral Interface) | SPI (Serial Peripheral Interface) | Both use SPI, so the host controller interface is compatible, but command sets and addressing must still be verified. |
| Maximum Clock Frequency | 66 MHz | 66 MHz | Clock rate determines maximum data throughput; identical ratings mean comparable read/write speed capability. |
| Supply Voltage Range | 2.7 V to 3.6 V | 2.7 V to 3.6 V | Operating voltage must match the system rail; identical ranges allow use in the same 3.3 V designs. |
| Package / Mounting | 8-SOIC (surface mount) | 8-SOIC (surface mount) | Package and footprint must match for board-level interchangeability; both being 8-SOIC supports physical compatibility. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature rating determines suitability for industrial versus commercial environments; matching ranges indicate equivalent environmental tolerance. |
| Organization | 1024 sectors x 8 pages | 128 sectors x 4 pages | Sector and page organization affects erase granularity and wear-leveling strategy; different organization requires firmware adaptation. |
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 | AT45DB081D-SU | AT45DB011D-SHET-T |
|---|---|---|
| Supplier | - | Dialog Semiconductor GmbH |
| Part Status | Obsolete | Obsolete |
| Memory Type | Non-Volatile | Non-Volatile |
| Memory Format | FLASH | FLASH |
| Technology | FLASH | FLASH |
| Memory Size | 8Mb (264 Bytes x 4096 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 AT45DB081D-SU and the AT45DB011D-SHET-T?
The AT45DB081D-SU is an 8-Mbit (1-Mbyte) DataFlash memory device in an 8-lead SOIC package (0.208" body width), while the AT45DB011D-SHET-T is a 1-Mbit (128-Kbyte) DataFlash device in an 8-lead SOIC package (0.150" body width). The primary differences are memory density (8 Mbit vs 1 Mbit), page size (264 bytes vs 264 bytes), and package body width, which affects PCB land pattern compatibility.
Are the AT45DB081D-SU and AT45DB011D-SHET-T pin-compatible?
Both devices use an 8-lead SOIC package with the same pin functions (SI, SO, SCK, CS, RESET, VCC, GND, WP). However, the AT45DB081D-SU uses a 0.208" wide SOIC body (EIAJ SOIC-8), while the AT45DB011D-SHET-T uses a 0.150" narrow SOIC body (JEDEC SOIC-8). The pin assignments are functionally equivalent, but the different package footprints mean they are not drop-in replacements on the same PCB land pattern without layout verification.
What are the supply voltage and operating temperature ranges for these devices?
Both the AT45DB081D-SU and AT45DB011D-SHET-T operate from a single 2.7V to 3.6V supply. The AT45DB081D-SU is specified for the industrial temperature range of -40°C to +85°C. The AT45DB011D-SHET-T is specified for the industrial temperature range of -40°C to +85°C. Both are 3.3V-class DataFlash devices and are not 5V-tolerant on the supply rail.
Can the AT45DB011D-SHET-T be used as a direct replacement for the AT45DB081D-SU in an existing design?
No, not as a direct drop-in replacement. Although both are 8-lead SOIC DataFlash devices with compatible SPI interfaces and command sets, the AT45DB011D-SHET-T has only 1 Mbit of density versus 8 Mbit for the AT45DB081D-SU, and the package body width differs (0.150" vs 0.208"). A design using the AT45DB081D-SU would need to be validated for reduced memory capacity and PCB land pattern compatibility before substituting the AT45DB011D-SHET-T.
What is the page size and organization of each device?
The AT45DB081D-SU is organized as 4096 pages of 264 bytes each (8,388,608 bits total), with two SRAM data buffers of 264 bytes each. The AT45DB011D-SHET-T is organized as 512 pages of 264 bytes each (1,048,576 bits total), also with two 264-byte SRAM data buffers. Both support page erase, block erase, and chip erase operations and use the same DataFlash command set.
What SPI interface and clock frequency do these devices support?
Both devices use a standard 4-wire SPI interface (SI, SO, SCK, CS) and support SPI modes 0 and 3. The AT45DB081D-SU supports a maximum SCK frequency of 66 MHz for rapidS (mode 0) and 50 MHz for standard SPI. The AT45DB011D-SHET-T supports a maximum SCK frequency of 66 MHz for rapidS and 50 MHz for standard SPI. Both are compatible with the RapidS serial interface for high-speed operation.
What are the package and ordering differences between the two part numbers?
The AT45DB081D-SU is supplied in an 8-lead SOIC package with a 0.208" body width (EIAJ SOIC-8), typically in tube or tape-and-reel packaging. The AT45DB011D-SHET-T is supplied in an 8-lead SOIC package with a 0.150" body width (JEDEC SOIC-8), in tape-and-reel packaging (the "-T" suffix indicates tape and reel). The "-SHET" suffix on the AT45DB011D indicates the SOIC-8 package, industrial temperature range, and tape-and-reel option.
Do both devices support the same command set and software compatibility?
Yes. Both the AT45DB081D-SU and AT45DB011D-SHET-T are members of the Atmel (now Microchip) DataFlash family and share the same command set, including read, program, erase, and status register commands. Software written for one device is generally portable to the other, provided the firmware accounts for the different memory density and page count. The status register format and buffer organization are consistent across both devices.