AT25DF041A-SSHF-B Microchip Integrated Circuit (Other) In Stock
AT25DF041A-SSHF-B is a 4-megabit (512 KB) SPI serial Flash memory from Microchip, supporting a clock frequency up to 85 MHz and operating from a 2.7 V to 3.6 V supply. It provides sector-erase granularity down to 4 KB, hardware and software write protection, and a standard 8-pin SOIC package. The device targets firmware storage and data logging in embedded microcontroller systems.
- Manufacturer
- Microchip
- Package
- Other
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- N/A
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 4-megabit (512 KB) SPI Flash with up to 85 MHz clock rate
- Sector erase granularity as small as 4 KB for flexible update cycles
- 2.7 V to 3.6 V supply voltage compatible with 3.3 V MCU systems
- Hardware and software write-protect pins for secure firmware storage
- Deep power-down mode reducing standby current to 5 µA
- Standard 8-pin SOIC package with wide industry support
Applications
The AT25DF041A-SSHF-B is commonly used to store firmware images and boot code in microcontroller-based embedded systems, enabling in-field firmware updates via SPI. It also suits data logging applications in industrial sensors and IoT nodes where 512 KB of non-volatile storage is sufficient for configuration tables and event records. Consumer electronics such as network routers and set-top boxes use it for storing persistent configuration and calibration data.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How fast can the AT25DF041A-SSHF-B transfer data over SPI, and does it support standard 3.3 V MCUs?
The AT25DF041A-SSHF-B supports a maximum SPI clock frequency of 85 MHz and operates from a 2.7 V to 3.6 V supply, making it directly compatible with 3.3 V microcontrollers without level shifting. At 85 MHz in single SPI mode, sequential read throughput approaches 10 MB/s, adequate for streaming firmware blocks or large data reads.
What erase granularity does the AT25DF041A-SSHF-B offer, and why does it matter for over-the-air firmware updates?
The device supports 4 KB sector erase, 32 KB block erase, and 64 KB block erase operations. The 4 KB minimum granularity is important for OTA updates because it allows rewriting small sections of a 512 KB firmware image without erasing large blocks, reducing the update time and the number of erase cycles consumed during incremental patch deployment.
How does the write protection mechanism on the AT25DF041A-SSHF-B prevent accidental firmware corruption?
The AT25DF041A-SSHF-B includes both a hardware WP pin and a software write-protect register. Asserting the WP pin low and writing the status register locks all or selected sectors against erase and program operations. This dual-layer protection ensures critical boot sectors remain intact even if the host MCU software has a defect that issues an unintended write command.
Which package does the AT25DF041A-SSHF-B come in, and how does the standby power affect battery life in IoT nodes?
The device is available in an 8-pin SOIC package. In deep power-down mode it draws only about 5 µA, which on a 500 mAh lithium cell equates to more than 10 years of standby storage life from the Flash alone. This ultra-low quiescent current makes it suitable for energy-harvested IoT sensors that stay in deep sleep most of the time.
Can the AT25DF041A-SSHF-B replace AT25DF041A variants from other distributors without re-qualification?
The SSHF-B suffix indicates an 8-pin SOIC package with a specific tape-and-reel and halogen-free marking; the core silicon is identical to other AT25DF041A package variants. Designs using a compatible 8-pin SOIC land pattern and the same 2.7 V to 3.6 V supply can typically substitute the SSHF-B variant without firmware or schematic changes, though users should verify the exact SPI timing parameters against the datasheet for their clock frequency.
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