Part A
AT25DF161-SH-T
компанией Adesto Technologies
- Lifecycle
- Active
- Stock
- 6126 ПКС
- Package
- SOIC-8
- Series
- Память
Replacement verdict
Compatible functional replacement candidate
The AT25DF041A-SSH-B is a lower-density member of the same Atmel (now Renesas) AT25DF SPI serial flash family as the AT25DF161-SH-T, sharing the same SOIC-8 footprint, SPI interface, and supply-voltage class. It can serve as a functional substitute only where the reduced 4-Mbit density is acceptable; the 16-Mbit capacity of the AT25DF161-SH-T cannot be matched by the smaller device, so density-sensitive designs require validation before substitution.
Memory Density
Validation required
Package Type
High match
Interface Type
High match
Supply Voltage Range
High match
Parts at a glance
Part B
AT25DF041A-SSH-B
компанией Adesto Technologies
- Lifecycle
- Active
- Stock
- 6689 ПКС
- Package
- SOIC-8
- Series
- Память
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AT25DF161-SH-T | AT25DF041A-SSH-B | Why it matters |
|---|---|---|---|
| Memory Density | 16 Mbit | 4 Mbit | Density determines total storage capacity; a 4 Mbit device cannot hold the same firmware image as a 16 Mbit device, so they are not directly substitutable without code changes. |
| Memory Organization | 2,048 pages x 256 bytes | 512 pages x 256 bytes | Page count and organization affect addressing, erase-block mapping, and firmware layout; different page counts require adjusted addressing logic. |
| Page Size | 256 bytes | 256 bytes | Identical page size means program operations and buffer sizing are compatible between the two devices. |
| Supply Voltage Range | 2.7 V to 3.6 V | 2.3 V to 3.6 V | The wider low-voltage range of the 4 Mbit part allows operation at lower supply rails, which can matter in battery-powered or low-voltage designs. |
| Interface Type | SPI (Single/Dual) | SPI (Single/Dual) | Matching SPI interface and dual-output support means the host controller protocol is compatible without redesign. |
| Maximum Clock Frequency | 100 MHz | 100 MHz | Identical maximum clock rate means read/program throughput per byte is comparable and timing budgets remain valid. |
| Package / Mounting | 8-SOIC (0.208", 5.30mm width), Surface Mount | 8-SOIC (0.154", 3.90mm width), Surface Mount | Different SOIC body widths affect PCB footprint and land pattern, so a board designed for one package may not accept the other without layout changes. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Both cover the industrial temperature range, so environmental operating limits are equivalent for most applications. |
| Erase Block Architecture | Uniform 4 KB sectors / 64 KB blocks | Uniform 4 KB sectors / 64 KB blocks | Matching sector and block sizes preserve erase granularity and file-system compatibility, though total block count differs with density. |
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 | AT25DF161-SH-T | AT25DF041A-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 | 16Mb (2M x 8) | 4Mb (512K x 8) |
| Memory Interface | SPI | SPI |
| Clock Frequency | 100 MHz | 70 MHz |
| Write Cycle Time - Word Page | 7µs, 3ms | 7µs, 5ms |
| 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 AT25DF161-SH-T and the AT25DF041A-SSH-B?
The AT25DF161-SH-T is a 16-Mbit (2 MB) SPI serial flash memory, while the AT25DF041A-SSH-B is a 4-Mbit (512 KB) device. The AT25DF161-SH-T is supplied in an 8-lead SOIC package (208-mil), whereas the AT25DF041A-SSH-B is supplied in an 8-lead SOIC package (150-mil). Both are manufactured by Adesto Technologies (now part of Dialog Semiconductor/Renesas).
Are the AT25DF161-SH-T and AT25DF041A-SSH-B pin-compatible?
Both devices use the standard 8-lead SOIC SPI flash pinout (CS, SO, WP, GND, SI, SCLK, HOLD, VCC). However, the AT25DF161-SH-T uses a 208-mil body width SOIC while the AT25DF041A-SSH-B uses a 150-mil body width SOIC, so the PCB land patterns differ and they are not drop-in replacements without layout verification.
Do both devices support the same SPI interface and operating voltage?
Yes. Both the AT25DF161-SH-T and AT25DF041A-SSH-B support standard SPI modes (Mode 0 and Mode 3) and operate from a 2.7 V to 3.6 V supply, making them compatible with common 3.3 V systems.
Can the AT25DF041A-SSH-B be used as a substitute for the AT25DF161-SH-T in an existing design?
Only if the application requires no more than 4 Mbit of storage and the PCB footprint is redesigned or adapted for the 150-mil SOIC package. The AT25DF041A-SSH-B has one-quarter the density of the AT25DF161-SH-T, so firmware image size and data storage requirements must be revalidated.
What are the typical operating temperature ranges for these devices?
Both the AT25DF161-SH-T and AT25DF041A-SSH-B are specified for the industrial temperature range of -40 °C to +85 °C, as documented in their respective Adesto datasheets.
Do both parts support the same erase and program commands?
Both devices support the standard SPI flash command set including Read, Page Program, Sector Erase, Block Erase, and Chip Erase, along with JEDEC-standard manufacturer and device ID read commands. Command opcodes and timing should still be confirmed against each specific datasheet before firmware reuse.
Which part is better suited for high-density firmware storage?
The AT25DF161-SH-T, with 16 Mbit of density, is better suited for larger firmware images or data logging. The AT25DF041A-SSH-B at 4 Mbit is more appropriate for boot code, configuration data, or smaller firmware footprints.