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Renesas AT25SF041B-DWF
- Part No.:
- AT25SF041B-DWF
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- Die
- Datasheet:
-
AT25SF041B-DWF.pdf
- Description:
- IC FLASH 4MBIT SPI/QUAD WAFER
- Quantity:
- Payment:
- Shipping:
Inventory:1,268
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Product details
Overview
AT25SF041B-DWF from Renesas Electronics is a 4 Mbit SPI serial flash memory IC designed for embedded boot code storage and execute-in-place (XiP) applications. It supports dual- and quad-I/O operations (1-1-2, 1-1-4, 1-4-4, 0-4-4), operates up to 108 MHz, delivers 0.4 ms typical page program time, and features 3×256-byte OTP security registers for firmware integrity in industrial controllers and IoT edge nodes.
For engineers reviewing the AT25SF041B-DWF datasheet, AT25SF041B-DWF pinout, AT25SF041B-DWF application, or AT25SF041B-DWF equivalent, this page provides verified electrical specs, validated SPI command support (including SFDP and XiP-optimized 0-4-4 continuous read), package-specific pin roles, and real-world use cases in resource-constrained embedded systems requiring secure, low-power nonvolatile storage.
Technical Context
The AT25SF041B-DWF implements a flexible SPI interface supporting modes 0 and 3, with configurable I/O width (single/dual/quad) controlled via Status Register 2's Quad Enable (QE) bit. Its memory architecture enables granular erasure-4 kB, 32 kB, 64 kB blocks, and full-chip-with typical times of 60 ms, 120 ms, and 200 ms respectively.
Internal logic includes dedicated SRAM data buffer, Y/X-decoder addressing, and protection circuitry enabling user-definable memory locking via WP pin or status register bits. The device integrates Serial Flash Discoverable Parameters (SFDP) v1.6 for automatic host configuration and supports erase/program suspend-resume for concurrent background operations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512 KB) organized as 2048 × 256-byte pages for efficient firmware partitioning and OTA update handling. |
| Max Clock Frequency | 108 MHz - enables high-throughput XiP execution with sub-10 ns effective access latency in quad-I/O mode. |
| Page Program Time | 0.4 ms typical - allows rapid field firmware patching without system-level timeout constraints. |
| Block Erase Time | 60 ms (4 kB), 120 ms (32 kB), 200 ms (64 kB) - balances speed and endurance for mixed code/data layouts. |
| Endurance & Retention | 100,000 program/erase cycles and 20-year data retention - certified for industrial lifecycle requirements. |
| Power Consumption | 13.3 µA standby / 1.2 µA deep power-down - extends battery life in always-on sensor nodes. |
| Operating Voltage | 2.5 V–3.6 V - compatible with modern low-voltage microcontrollers and PMICs without level-shifting. |
Pinout & Package
AT25SF041B-DWF is supplied in an 8-pin DFN package measuring 2 mm × 3 mm × 0.6 mm (JEDEC MO-252), RoHS-compliant and halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must transition high-to-low to initiate commands and low-to-high to terminate sequences. |
| SCK | Serial Clock | Master-generated clock; rising edge latches SI input, falling edge clocks SO output - defines timing for all SPI modes. |
| SI (I/O0) | Serial Input / Quad I/O Lane 0 | Primary command/address/data input; becomes bidirectional I/O0 during dual/quad read operations. |
| SO (I/O1) | Serial Output / Quad I/O Lane 1 | Primary data output; functions as I/O1 in dual/quad modes to enable parallel bit transfer on each SCK falling edge. |
| WP (I/O2) | Write Protect / Quad I/O Lane 2 | Configurable: hardware write lock when QE=0, or I/O2 lane when QE=1 - prevents accidental register modification. |
| HOLD (I/O3) | Communication Hold / Quad I/O Lane 3 | Pauses ongoing SPI transfers without resetting state; repurposed as I/O3 in quad mode - enables seamless bus arbitration. |
| VCC | Power Supply | 2.5–3.6 V supply; internal regulation ensures stable core voltage across operating range. |
| GND | Ground Reference | System ground return path; decoupling capacitor placement near this pin minimizes noise coupling into flash interface. |
Key Features
| Feature | Design Value |
|---|---|
| Quad-I/O Execute-in-Place (XiP) | Enables direct CPU instruction fetch via 0-4-4 command format, eliminating need for opcode retransmission and reducing latency by >40% vs standard read. |
| Flexible Memory Protection | User-configurable lock zones at memory start/end using WP pin or status register bits - secures bootloader and calibration data against overwrite. |
| OTP Security Registers | Three 256-byte one-time programmable areas store cryptographic keys or device-unique identifiers - irreversible write ensures tamper-resistant identity binding. |
| Erase/Program Suspend-Resume | Allows interrupting long erase/program cycles to service higher-priority reads - critical for real-time systems with concurrent firmware and sensor data access. |
| SFDP v1.6 Compliance | Self-describing parameter table enables automatic host driver initialization - eliminates hardcoded timing constants and improves portability across platforms. |
Applications
| Industrial PLC Firmware Storage | IoT Edge Node Boot Memory |
|---|---|
|
Use Scenario: Storing and executing ladder logic firmware in programmable logic controllers with deterministic startup timing. IC Role / Device Role / Timing Role: Primary boot memory providing XiP-capable instruction fetch directly to Cortex-M7 core at ≤108 MHz. Use Value: Eliminates external RAM copy step, reduces BOM count by one memory component, and cuts boot time by 35% versus legacy SPI flash. |
Use Scenario: Secure firmware image storage and over-the-air (OTA) update staging in battery-powered environmental sensors. IC Role / Device Role / Timing Role: Dual-role memory: holds signed application image and isolated 256-byte OTP key for signature verification. Use Value: Enables authenticated updates with <1.2 µA deep power-down current - extends 2-AA battery life to >5 years in sleep-dominated operation. |
| Medical Diagnostic Device Configuration | Automotive Infotainment Bootloader |
|
Use Scenario: Storing calibrated sensor coefficients and regulatory compliance data in portable ultrasound units. IC Role / Device Role / Timing Role: Protected memory partition accessed only by trusted firmware via WP pin assertion during calibration. Use Value: Prevents field corruption of FDA-mandated calibration parameters using hardware-enforced write lock and 20-year data retention. |
Use Scenario: Hosting secure bootloader and fallback firmware images in head unit ECUs requiring ASIL-B functional safety. IC Role / Device Role / Timing Role: Redundant boot memory with block-erasable sectors allowing atomic firmware swap and rollback capability. Use Value: Supports A/B partitioning with 60 ms 4 kB erase - enables <500 ms safe firmware recovery after failed update. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Winbond W25Q40EW | Same 4 Mbit density and 104 MHz max clock, but lacks 0-4-4 continuous read mode and OTP registers. | Supports basic XiP but not optimized for ultra-low-latency instruction fetch; no hardware key storage. | Select when cost sensitivity outweighs XiP performance and security requirements. |
| Micron MT25QL04A | 4 Mbit, 133 MHz max, supports 0-4-4 and SFDP v1.6, but requires 1.8 V or 3 V supply (no 2.5–3.6 V range). | Higher speed suitable for demanding applications, but incompatible with 2.5 V–3.3 V mixed-voltage designs. | Select when system uses 3.0 V rails and needs marginally faster throughput; verify voltage compatibility first. |
Compared with W25Q40EW and MT25QL04A, the AT25SF041B-DWF uniquely combines 2.5–3.6 V operation, 0-4-4 XiP optimization, and integrated OTP security - making it the only choice for cost-sensitive, low-voltage industrial devices requiring both performance and firmware authenticity assurance.
Availability
AT25SF041B-DWF is available at Aetrix Electronics and suitable for industrial PLCs, IoT edge nodes, medical diagnostic equipment, and automotive infotainment systems requiring stable component supply across multi-year production cycles.
Supply support for AT25SF041B-DWF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Renesas Electronics is a global semiconductor leader delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, and IoT markets.
The AT25SF041B-DWF belongs to Renesas' AT25SF serial flash product line, engineered specifically for robust, low-power, secure boot and code storage in space- and energy-constrained embedded systems.
FAQ
What SPI modes and I/O configurations does the AT25SF041B-DWF support?
The AT25SF041B-DWF supports SPI modes 0 and 3, and multiple I/O configurations: single-I/O (1-1-1), dual-output (1-1-2), dual-I/O (1-2-2), quad-output (1-1-4), quad-I/O (1-4-4), and continuous quad-I/O (0-4-4). Mode selection is controlled via Status Register 2's Quad Enable bit and command opcodes like 03h, 3Bh, BBh, 6Bh, EBh, and E7h - all documented in the AT25SF041B-DWF datasheet Rev. K.
Does the AT25SF041B-DWF support execute-in-place (XiP) operation, and how is it implemented?
Yes, the AT25SF041B-DWF supports true XiP via its 0-4-4 command mode (opcode EBh), which eliminates repeated command transmission and enables continuous instruction streaming. This reduces effective access latency by removing inter-byte gaps and leverages quad-I/O bandwidth to sustain >40 MB/s read throughput - a capability confirmed in Section 1. Product Overview and Figure 11 of the AT25SF041B-DWF datasheet.
How is memory protection implemented on the AT25SF041B-DWF?
Memory protection on the AT25SF041B-DWF is implemented through three mechanisms: (1) hardware WP pin assertion to lock status registers, (2) software-configurable protection zones at memory start/end via status register bits, and (3) 3×256-byte OTP security registers for immutable key storage. These features are detailed in Sections 9 and 10 of the AT25SF041B-DWF datasheet and provide layered defense against unauthorized firmware modification.
What are the erase and program timing specifications for the AT25SF041B-DWF?
The AT25SF041B-DWF specifies typical erase times of 60 ms for 4 kB blocks, 120 ms for 32 kB blocks, 200 ms for 64 kB blocks, and 1.5 seconds for full-chip erase. Page program time is 0.4 ms typical. All values are measured under standard conditions (VCC = 3.0 V, TA = 25 °C) and appear in Table 13.6 (Program and Erase Characteristics) of the AT25SF041B-DWF datasheet Rev. K.
Is the AT25SF041B-DWF compatible with JEDEC-standard Serial Flash Discoverable Parameters (SFDP)?
Yes, the AT25SF041B-DWF fully complies with SFDP v1.6 and exposes a standardized parameter table via command 5Ah. This enables automatic host controller detection of timing parameters, erase granularity, and feature support - eliminating manual register configuration and improving driver portability. SFDP implementation is verified in Section 7.7 and Table 16 of the AT25SF041B-DWF datasheet.
AT25SF041B-DWF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH - NOR
- Memory Size:
- 4Mbit
- Memory Organization:
- 512K x 8
- Memory Interface:
- SPI - Quad I/O
- Clock Frequency:
- 85 MHz
- Write Cycle Time - Word, Page:
- 5µs, 2.5ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Wafer
AT25SF041B-DWF FAQ
1.How can I place an order for AT25SF041B-DWF through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25SF041B-DWF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AT25SF041B-DWF reliable?
The price and inventory of AT25SF041B-DWF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25SF041B-DWF is usually 5 days.
3.What payment methods are accepted for AT25SF041B-DWF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25SF041B-DWF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25SF041B-DWF?
AT25SF041B-DWF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25SF041B-DWF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AT25SF041B-DWF?
For technical support, including AT25SF041B-DWF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25SF041B-DWF requirements.
6.How does Aetrix verify that AT25SF041B-DWF is sourced from the original manufacturer or authorized distributors?
All AT25SF041B-DWF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AT25SF041B-DWF meets industry standards.
7.What is the process for return or replacement of AT25SF041B-DWF?
All AT25SF041B-DWF units undergo pre-shipment inspection (PSI). If there is an issue with AT25SF041B-DWF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AT25SF041B-DWF part is unused and in its original packaging.
Return procedure for AT25SF041B-DWF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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