Part A
AT45DB161D-TU
Adesto 기술
- Lifecycle
- Active
- Stock
- 7667 PCS
- Package
- TSSOP-28
- Series
- 기억력
Replacement verdict
Compatible functional replacement candidate
The AT45DB321D-TU-SL383 is a higher-density functional replacement candidate for the AT45DB161D-TU, offering twice the memory capacity within the same DataFlash family and package footprint. Designers must validate density-dependent firmware addressing, page-size assumptions, and timing margins before adopting it as a drop-in substitute.
Memory Density
Validation required
Package Type
High match
Supply Voltage
High match
Interface and Timing
Validation required
Parts at a glance
Part B
AT45DB321D-TU-SL383
Adesto 기술
- Lifecycle
- Active
- Stock
- 4048 PCS
- Package
- TSSOP-28
- 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 | AT45DB161D-TU | AT45DB321D-TU-SL383 | Why it matters |
|---|---|---|---|
| Memory Density | 16 Mbit (2 MB) | 32 Mbit (4 MB) | Density determines total storage capacity; a 32 Mbit device holds twice the data of a 16 Mbit device, so they are not directly substitutable for capacity-critical designs. |
| Page Size | 512 bytes (528 bytes with ECC) | 512 bytes (528 bytes with ECC) | Page size affects write granularity and buffer usage; matching page sizes simplifies firmware portability between the two parts. |
| Number of Pages | 4096 pages | 8192 pages | Page count combined with page size defines total array size and address range; differing counts require address map changes in firmware. |
| Supply Voltage Range | 2.7 V to 3.6 V | 2.7 V to 3.6 V | Identical operating voltage ranges mean both parts are compatible with the same 3.3 V system rails without level shifting. |
| Interface Type | SPI (Serial Peripheral Interface) | SPI (Serial Peripheral Interface) | A common SPI interface allows the same host controller and driver framework to communicate with either device. |
| Maximum Clock Frequency | 66 MHz | 66 MHz | Matching maximum clock rates ensure comparable throughput and timing budgets when swapping parts. |
| Package / Mounting | 28-lead TSOP, surface mount | 28-lead TSOP, surface mount | Identical package and footprint allow drop-in board placement without PCB redesign. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Equivalent industrial temperature ratings ensure both parts suit the same environmental conditions. |
| Organization (Sectors) | 16 sectors | 32 sectors | Sector count affects erase-block management and wear-leveling strategy; differing counts require firmware adjustments. |
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 | AT45DB161D-TU | AT45DB321D-TU-SL383 |
|---|---|---|
| Supplier | - | Dialog Semiconductor GmbH |
| Part Status | Obsolete | Obsolete |
| Memory Type | Non-Volatile | Non-Volatile |
| Memory Format | FLASH | FLASH |
| Technology | FLASH | FLASH |
| Memory Size | 16Mb (528 Bytes x 4096 pages) | 32Mb (528 Bytes x 8192 pages) |
| Memory Interface | SPI | SPI |
| Clock Frequency | 66 MHz | 66 MHz |
| Write Cycle Time - Word Page | 6ms | 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-TU and the AT45DB321D-TU-SL383?
The primary difference is memory density: the AT45DB161D-TU is a 16-Mbit (2-Mbyte) DataFlash device, while the AT45DB321D-TU-SL383 is a 32-Mbit (4-Mbyte) DataFlash device. Both are members of the AT45DBxxxD family from Adesto Technologies (formerly Atmel) and share the same command architecture, page size of 512 bytes (plus 16-byte SRAM per page), and serial SPI interface, but the AT45DB321D offers twice the total capacity and twice the number of pages (8192 pages versus 4096 pages).
Are the AT45DB161D-TU and AT45DB321D-TU-SL383 pin-compatible?
Yes. Both devices are offered in the same 28-lead TSOP Type I (8 x 13.4 mm) package with an identical pinout, including SI, SO, SCK, CS, RESET, WP, VCC, and GND. This allows the AT45DB321D-TU-SL383 to be used as a drop-in density upgrade on a PCB designed for the AT45DB161D-TU, provided the firmware addresses the larger page and capacity space correctly.
Do both devices use the same SPI interface and command set?
Yes. Both the AT45DB161D-TU and AT45DB321D-TU-SL383 use a standard 4-wire SPI interface (Serial Peripheral Interface) supporting clock frequencies up to 66 MHz and share the same command set, including Read Array, Page Program, Page Erase, Block Erase, Chip Erase, and status register operations. The opcodes and command structure are compatible across the AT45DBxxxD family, so firmware written for one density generally works on the other with only capacity-related address adjustments.
What is the page size and SRAM buffer configuration of these devices?
Both the AT45DB161D-TU and AT45DB321D-TU-SL383 use a 528-byte page organization: 512 bytes of main memory plus 16 bytes of SRAM buffer per page. Each device includes two 528-byte SRAM data buffers that allow data to be received while a page in the main memory array is being programmed, improving throughput in write-intensive applications.
What are the operating voltage and temperature ranges for these DataFlash devices?
Both the AT45DB161D-TU and AT45DB321D-TU-SL383 operate from a single 2.7 V to 3.6 V supply and are specified for the industrial temperature range of -40 °C to +85 °C. These ratings are consistent across the AT45DBxxxD family and should be confirmed against the respective manufacturer datasheets for the exact ordering code.
Can the AT45DB321D-TU-SL383 directly replace the AT45DB161D-TU in an existing design?
Hardware replacement is straightforward because both parts share the same 28-lead TSOP package and pinout. However, firmware must be reviewed: the AT45DB321D-TU-SL383 has 8192 pages versus 4096 pages on the AT45DB161D-TU, so any code that assumes a fixed page count, capacity boundary, or status register density bits must be updated. The "-SL383" suffix indicates a specific ordering variant (typically tape-and-reel or lead-free packaging per the manufacturer's ordering code), so the exact suffix should be verified against the Adesto/Renesas ordering guide.
What are typical applications for the AT45DB161D-TU and AT45DB321D-TU-SL383?
These serial DataFlash devices are typically used for code shadowing, data logging, firmware storage, voice and audio data storage, and configuration data in embedded systems. The AT45DB161D-TU (16 Mbit) suits smaller code or data storage needs, while the AT45DB321D-TU-SL383 (32 Mbit) is chosen when larger firmware images, data logs, or audio buffers are required within the same board footprint.
Are these devices still recommended for new designs, and who manufactures them?
The AT45DB161D and AT45DB321D families were originally developed by Atmel and later produced by Adesto Technologies, which was acquired by Renesas Electronics. Designers should verify current lifecycle status, availability, and any recommended replacement parts directly with Renesas or authorized distributors such as DigiKey, Mouser, or TTI, since product lifecycle status can change and should not be assumed from third-party sources.