Part A
AT45DB321E-SHF-B
Adesto 기술
- Lifecycle
- Active
- Stock
- 2389 PCS
- Package
- SOIC-8
- Series
- 기억력
Replacement verdict
Compatible functional replacement candidate
The AT45DB321E-SHF2B-T and AT45DB321E-SHF-B are functionally equivalent DataFlash memory devices sharing identical density, interface, and package configuration, making them a viable replacement candidate. The primary distinction lies in the shipping container and packing quantity, which does not affect electrical or functional performance. Designers should confirm the tape-and-reel packaging specification against their assembly line requirements before substituting.
Memory Density and Organization
High match
Interface Type
High match
Package Type
High match
Packing and Shipping Form
Validation required
Parts at a glance
Part B
AT45DB321E-SHF2B-T
Adesto 기술
- Lifecycle
- Active
- Stock
- 2123 PCS
- Package
- SOIC-W-8
- Series
- 기억력
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-SHF2B-T | AT45DB321E-SHF-B | Why it matters |
|---|---|---|---|
| Memory Type | Data Flash (NOR Flash based) | Data Flash (NOR Flash based) | Both are Data Flash devices, so the memory technology and access behavior are equivalent for firmware and driver compatibility. |
| Memory Size | 32 Mbit (4 MByte) | 32 Mbit (4 MByte) | Identical density ensures the same address space and storage capacity, allowing direct substitution without firmware changes. |
| Memory Organization | 8192 pages x 512 bytes (or 528 bytes) | 8192 pages x 512 bytes (or 528 bytes) | Matching page and sector organization is essential for correct read, program, and erase operations in existing firmware. |
| Supply Voltage | 2.3 V to 3.6 V | 2.3 V to 3.6 V | The same operating voltage range means both parts work in the same power domain without level shifting or regulator changes. |
| Interface Type | SPI (Serial Peripheral Interface) | SPI (Serial Peripheral Interface) | A common SPI interface ensures the same host controller pins and protocol can be used for either device. |
| Maximum Clock Frequency | 85 MHz | 85 MHz | Identical maximum SPI clock supports the same throughput and timing budget in the application. |
| Package / Case | 8-SOIC (0.209 in, 5.30 mm width) | 8-SOIC (0.209 in, 5.30 mm width) | The same package footprint allows drop-in board replacement without PCB redesign. |
| Mounting Type | Surface Mount | Surface Mount | Both are surface-mount devices, so assembly processes and board layout remain unchanged. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The same industrial temperature range ensures equivalent environmental robustness for the target application. |
| Packaging / Ordering Suffix | Tape and Reel (T suffix) | Tray / Tube (B suffix) | The suffix indicates different shipping packaging, which affects manufacturing handling but not the electrical function of the device. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AT45DB321E-SHF-B | AT45DB321E-SHF2B-T |
|---|---|---|
| Part Status | Active | Active |
| Memory Type | Non-Volatile | Non-Volatile |
| Memory Format | FLASH | FLASH |
| Technology | FLASH | FLASH |
| Memory Size | 32Mb (528 Bytes x 8192 pages) | 32Mb (512 Bytes x 8192 pages) |
| Memory Interface | SPI | SPI |
| Clock Frequency | 85 MHz | 85 MHz |
| Write Cycle Time - Word Page | 8µs, 4ms | 8µs, 4ms |
| Voltage - Supply | 2.3V ~ 3.6V | 2.3V ~ 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-SHF2B-T and the AT45DB321E-SHF-B?
Both devices are 32-Mbit (4-Mbyte) DataFlash serial flash memories from the AT45DB321E family in an 8-lead SOIC (0.208" body) package. The primary difference is the ordering code suffix: the AT45DB321E-SHF2B-T is supplied in tape-and-reel packaging (the "-T" suffix), while the AT45DB321E-SHF-B is the standard bulk/tube ordering variant. The "-2" in the SHF2B-T code denotes the specific packing/ordering option defined by the manufacturer. Core memory density, interface, and package type are the same; designers should confirm the exact ordering-code definition in the official AT45DB321E datasheet ordering information table.
Are the AT45DB321E-SHF2B-T and AT45DB321E-SHF-B functionally interchangeable?
Yes, from a functional and electrical standpoint both are the same AT45DB321E 32-Mbit DataFlash device in the same 8-lead SOIC package, so they share identical memory organization, command set, and operating characteristics. The difference is limited to the ordering/packaging code. Interchangeability in a design is therefore generally acceptable, but the packaging format (tape-and-reel vs. bulk) must match the assembly line's feeder and handling requirements.
What is the memory density and organization of the AT45DB321E?
The AT45DB321E is a 32-Mbit (4-Mbyte) serial DataFlash memory organized as 8,192 pages of 512 bytes (or 528 bytes) each, with two SRAM data buffers of 512/528 bytes. It supports page program, page erase, block erase, and sector erase operations. These parameters are common to both the AT45DB321E-SHF2B-T and AT45DB321E-SHF-B since they are the same die.
What interface and clock speed do these devices support?
The AT45DB321E uses a serial peripheral interface (SPI) compatible interface supporting SPI modes 0 and 3, with a maximum clock frequency of 85 MHz for standard read operations. It also supports RapidS operation for high-speed continuous data transfer. Both the AT45DB321E-SHF2B-T and AT45DB321E-SHF-B share these interface specifications.
What is the operating voltage and temperature range for these parts?
The AT45DB321E operates from a single 2.7 V to 3.6 V supply. The industrial temperature range version (indicated by the "I" or industrial suffix in the ordering code) supports -40 °C to +85 °C operation. Designers should verify the exact temperature grade from the ordering code in the manufacturer's datasheet, as the SHF ordering code corresponds to the industrial temperature range.
Does the "-T" suffix on the AT45DB321E-SHF2B-T indicate tape-and-reel packaging?
Yes, in the manufacturer's ordering nomenclature the "-T" suffix designates tape-and-reel packing, which is intended for automated pick-and-place assembly. The AT45DB321E-SHF-B without the "-T" suffix is the standard bulk (tube/tray) ordering variant. Buyers should confirm reel size and quantity per reel from the manufacturer's ordering information, as these details are defined in the datasheet's ordering code table.
What package do the AT45DB321E-SHF2B-T and AT45DB321E-SHF-B use?
Both parts are offered in the 8-lead SOIC package with a 0.208-inch (5.28 mm) body width, commonly referred to as the "SHF" package code in the AT45DB321E ordering scheme. The package is Pb-free and RoHS-compliant per the manufacturer's environmental specifications. Pinout and land pattern are identical between the two ordering variants.
Which part should be selected for high-volume automated assembly?
For high-volume automated SMT assembly, the AT45DB321E-SHF2B-T is the appropriate choice because its tape-and-reel packaging is designed for pick-and-place feeders. The AT45DB321E-SHF-B bulk variant is more suitable for prototyping, low-volume runs, or manual handling. Selection should be based on the assembly line's packaging requirements rather than any electrical difference, since both share the same silicon and package.