Part A
AT25DF081A-SSH-T
Technologie adesto
- Lifecycle
- Active
- Stock
- 3274 PCS
- Package
- SOIC-8
- Series
- Mémoire
Replacement verdict
Compatible functional replacement candidate
The AT25DF161-SH-B is a functional replacement candidate for the AT25DF081A-SSH-T, offering double the density in the same SOIC-8 footprint with matching SPI interface and supply voltage. Designers must validate the increased page size, higher clock rate, and extended temperature range against their specific application requirements before substitution.
Density
High match
Package Type
High match
Page Size
Validation required
Operating Temperature
Validation required
Parts at a glance
Part B
AT25DF161-SH-B
Technologie de micropuce
- Lifecycle
- Active
- Stock
- 5599 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 | AT25DF081A-SSH-T | AT25DF161-SH-B | Why it matters |
|---|---|---|---|
| Memory Density | 8 Mbit (1 MB) | 16 Mbit (2 MB) | Density determines total storage capacity; a 16 Mbit device cannot be substituted where an 8 Mbit footprint and address range are expected without firmware changes. |
| Memory Organization | 1,024 pages x 256 bytes | 8,192 pages x 256 bytes | Page size affects write buffering and programming routines; both share 256-byte pages, easing firmware portability. |
| Supply Voltage Range | 2.7 V to 3.6 V | 2.7 V to 3.6 V | Identical operating voltage ensures both parts work in the same 3.3 V system without level shifting. |
| Interface Type | SPI (Single/Dual) | SPI (Single/Dual) | Matching SPI interface and dual-I/O support allows the same host controller and command set to be reused. |
| Maximum Clock Frequency | 70 MHz | 70 MHz | Equal clock rate means comparable read/write throughput and timing budget in the target design. |
| Package / Mounting | 8-SOIC (surface mount) | 8-SOIC (surface mount) | Both use the same 8-SOIC footprint, but the suffix codes indicate different ordering/temperature variants that must be confirmed against the datasheet. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Industrial temperature range must match the application environment; both are rated for industrial use. |
| Endurance (Program/Erase Cycles) | 100,000 cycles | 100,000 cycles | Equal endurance ensures comparable lifetime for frequently rewritten data or code storage. |
| Data Retention | 20 years | 20 years | Matching retention guarantees long-term data integrity for both parts in non-volatile storage roles. |
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 | AT25DF081A-SSH-T | AT25DF161-SH-B |
|---|---|---|
| Supplier | - | Microchip Technology |
| Part Status | Active | Obsolete |
| Memory Type | Non-Volatile | Non-Volatile |
| Memory Format | FLASH | FLASH |
| Technology | FLASH | FLASH |
| Memory Size | 8Mb (256 Bytes x 4096 pages) | 16Mb (2M x 8) |
| Memory Interface | SPI | SPI |
| Clock Frequency | 100 MHz | 100 MHz |
| Write Cycle Time - Word Page | 7µs, 3ms | 7µs, 3ms |
| 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 AT25DF081A-SSH-T and the AT25DF161-SH-B?
The AT25DF081A-SSH-T is an 8-Mbit (1 MByte) SPI serial flash memory, while the AT25DF161-SH-B is a 16-Mbit (2 MByte) SPI serial flash memory. Both are manufactured by Adesto Technologies (formerly Atmel) and use the same SPI interface, but they differ in density, package, and temperature grade.
What package types do these two devices use?
The AT25DF081A-SSH-T is supplied in an 8-lead SOIC package (0.150" body width). The AT25DF161-SH-B is supplied in an 8-lead SOIC package (0.208" body width). Both are surface-mount SOIC packages, but the body widths differ, so PCB land patterns should be verified before substitution.
What are the operating temperature ranges for these parts?
The AT25DF081A-SSH-T is specified for the industrial temperature range of -40°C to +85°C. The AT25DF161-SH-B is specified for the industrial temperature range of -40°C to +85°C as well. Both are rated for industrial-grade operation.
What supply voltage do the AT25DF081A-SSH-T and AT25DF161-SH-B require?
Both devices operate from a single 2.7V to 3.6V supply. This is the standard voltage range for the Adesto AT25DF series SPI serial flash family.
What SPI clock frequency do these devices support?
Both the AT25DF081A-SSH-T and AT25DF161-SH-B support SPI clock frequencies up to 85 MHz for standard read operations. This is consistent with the AT25DF series datasheet specifications.
Can the AT25DF081A-SSH-T be used as a drop-in replacement for the AT25DF161-SH-B?
No, they are not drop-in replacements. Although both are 8-lead SOIC SPI flash devices with the same interface and voltage range, they differ in memory density (8 Mbit vs 16 Mbit) and SOIC body width (0.150" vs 0.208"). The PCB land pattern and firmware memory map must be validated before any substitution.
What are the typical applications for these SPI serial flash devices?
Both the AT25DF081A-SSH-T and AT25DF161-SH-B are used for code storage, data logging, and configuration storage in embedded systems, consumer electronics, industrial controllers, and networking equipment. The higher-density AT25DF161-SH-B is suited to applications requiring more non-volatile storage.
Do these devices support the standard SPI and Dual-SPI modes?
Yes, both the AT25DF081A-SSH-T and AT25DF161-SH-B support standard SPI, Dual-Output SPI, and Dual-I/O SPI modes. This allows higher read throughput when using the dual I/O modes compared to standard SPI.