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Renesas AT25SF641B-DWF
- Part No.:
- AT25SF641B-DWF
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- Die
- Datasheet:
-
AT25SF641B-DWF.pdf
- Description:
- IC FLASH 64MBIT SPI/QUAD DIE
- Quantity:
- Payment:
- Shipping:
Inventory:2,102
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Product details
Overview
AT25SF641B-DWF from Renesas Electronics is a 64-Mbit SPI serial flash memory IC designed for code storage and execute-in-place (XiP) applications in embedded systems. It operates from a single 2.7–3.6 V supply, supports SPI modes 0/3, delivers up to 104 MHz fast read speed, and features quad I/O (1-4-4) and continuous read for low-latency boot and firmware execution in industrial controllers.
For engineers reviewing the AT25SF641B-DWF datasheet, AT25SF641B-DWF pinout, AT25SF641B-DWF application, or AT25SF641B-DWF equivalent, key selection criteria include XiP support, 104 MHz dual/quad read bandwidth, 4 kB–64 kB flexible erase granularity, deep power-down current of 1 µA, and OTP security register availability for firmware integrity.
Technical Context
The AT25SF641B-DWF implements a unified SPI interface supporting standard, dual-output (1-1-2), dual-I/O (1-2-2), quad-output (1-1-4), and quad-I/O (1-4-4, 0-4-4) command sets - enabling scalable bandwidth from 1-bit to 4-bit per clock cycle. Its internal architecture includes SRAM data buffers, Y/X decoders, and control logic optimized for XiP latency reduction.
Memory protection is implemented via user-definable protected regions at array start/end, controlled by WP pin and Status Register bits SRP0/SRP1. The device integrates three 256-byte one-time programmable (OTP) security registers and supports Serial Flash Discoverable Parameters (SFDP) for host auto-configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 64 Mbit (8 MB) - sufficient for full MCU boot images and firmware updates in resource-constrained edge devices. |
| Max Clock Frequency | 133 MHz - enables high-throughput programming and verification during production test. |
| Fast Read Speed | 104 MHz - reduces instruction fetch latency in XiP configurations for real-time response-critical applications. |
| Erase Time (4 kB block) | 65 ms typical - balances speed and endurance for frequent field firmware updates. |
| Page Program Time | 0.4 ms typical for 1–256 bytes - supports efficient small-data logging without blocking host CPU. |
| Deep Power-Down Current | 1 µA typical - extends battery life in always-on IoT sensors and portable instrumentation. |
| Data Retention | 20 years - ensures long-term reliability for industrial equipment with 10+ year service lifecycles. |
Pinout & Package
AT25SF641B-DWF is packaged in an 8-pad, 5 × 6 × 0.6 mm DFN (Dual Flat No-lead) package, RoHS-compliant and halogen-free. Pin 1 is CS; pins are arranged counterclockwise with CS (1), SO/I/O1 (2), WP/I/O2 (3), GND (4), VCC (5), HOLD/I/O3 (6), SCK (7), SI/I/O0 (8).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must transition low-to-high to complete operations and enter standby mode after self-timed erase/program cycles. |
| SCK | Serial Clock | Master-generated clock; rising edge latches input (SI), falling edge clocks output (SO); timing critical for 133 MHz operation. |
| SI / I/O0 | Serial Input / Quad I/O Lane 0 | Primary command/address/data input; becomes bidirectional I/O0 in dual/quad modes - requires pull-up if unused in non-quad config. |
| SO / I/O1 | Serial Output / Quad I/O Lane 1 | Standard output in single/dual modes; functions as I/O1 in quad-I/O - high-impedance when CS is high. |
| WP / I/O2 | Write Protect / Quad I/O Lane 2 | Configurable: write-protection enable (when QE=0, SRP1=0, SRP0=1) or I/O2 (when QE=1); internally pulled high. |
| HOLD / I/O3 | Hold / Quad I/O Lane 3 | Pauses ongoing SPI transfer without resetting state (SCK must be low); repurposed as I/O3 in quad mode; internally pulled high. |
Key Features
| Feature | Design Value |
|---|---|
| Quad I/O (1-4-4) & Continuous Read (0-4-4) | Eliminates opcode overhead per read burst, enabling deterministic XiP latency under 100 ns per 32-bit word in optimized systems. |
| Erase/Program Suspend & Resume | Allows host to interrupt long erase (up to 30 s chip erase) or program operations to service higher-priority interrupts - critical for real-time OS environments. |
| Three 256-byte OTP Security Registers | Stores immutable keys, certificates, or calibration data; prevents tampering while enabling secure boot chain validation in certified industrial devices. |
| User-Definable Memory Protection | Enables hardware-enforced write lock on top/bottom sectors (e.g., bootloader region) independent of software control - mitigates accidental or malicious firmware corruption. |
| SFDP Register Support | Provides standardized JEDEC-compliant parameter table accessible via 5Ah command, enabling automatic host driver configuration without hard-coded timing assumptions. |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Code Execution |
|---|---|
Use Scenario: Storing and executing ladder logic firmware in programmable logic controllers with strict uptime requirements. IC Role / Device Role / Timing Role: Non-volatile code storage and execute-in-place (XiP) memory, directly feeding instructions to ARM Cortex-M7 core. Use Value: 104 MHz quad-I/O read speed and 20-year data retention ensure deterministic boot timing and field longevity without refresh cycles. | Use Scenario: Hosting certified bootloader and diagnostic firmware in FDA-class II infusion pumps requiring secure update capability. IC Role / Device Role / Timing Role: Secure, tamper-resistant firmware repository with OTP registers for cryptographic key storage and SFDP-based configuration. Use Value: Hardware write protection and 3×256-byte OTP registers meet IEC 62304 security requirements for medical firmware integrity. |
| Automotive ADAS Camera Module | Smart Energy Meter Firmware |
Use Scenario: Storing image processing firmware and calibration tables in automotive surround-view camera ECUs operating across -40°C to +85°C. IC Role / Device Role / Timing Role: High-reliability SPI flash providing XiP execution for real-time vision algorithms on SoC with minimal external RAM footprint. Use Value: Industrial temperature rating (-40°C to +85°C) and 100,000 program/erase cycles support 15-year vehicle lifecycle with over-the-air updates. | Use Scenario: Holding metrology firmware, tariff tables, and communication stack in ANSI C12.22-compliant smart electricity meters deployed in utility grids. IC Role / Device Role / Timing Role: Low-power, high-endurance memory for infrequent but mission-critical firmware upgrades and secure parameter storage. Use Value: 1 µA deep power-down current extends battery backup life beyond 10 years; 4 kB block erase enables precise field update partitioning. |
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 W25Q64JVSSIQ | 64 Mbit density, 133 MHz max clock, but lacks 0-4-4 continuous read mode and OTP security registers. | Supports standard quad-I/O but no XiP-optimized continuous read; no hardware OTP for secure key storage. | Select when cost sensitivity outweighs XiP latency and security requirements. |
| Micron MT25QL64ABA8E12-0SIT | 64 Mbit, 133 MHz, supports SFDP and deep power-down (1 µA), but uses different status register layout and lacks erase/program suspend/resume. | Compatible for basic firmware storage but not suitable for real-time OS environments requiring interruptible flash operations. | Select for drop-in replacement where suspend/resume is not required and existing Micron driver stack is in use. |
Compared with W25Q64JVSSIQ and MT25QL64ABA8E12-0SIT, the AT25SF641B-DWF uniquely combines 0-4-4 continuous read for sub-100 ns XiP latency, hardware suspend/resume for RTOS compatibility, and three OTP registers for secure boot - making it optimal for safety-critical, latency-sensitive embedded systems.
Availability
AT25SF641B-DWF is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device boot code execution, and automotive ADAS camera modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AT25SF641B-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 AT25SF641B-DWF belongs to Renesas' AT25SF family of SPI flash memories engineered specifically for execute-in-place (XiP) performance, low-power operation, and hardware-level security in mission-critical embedded systems.
FAQ
What is the maximum SPI clock frequency supported by the AT25SF641B-DWF?
The AT25SF641B-DWF supports a maximum operating frequency of 133 MHz, enabling high-speed programming and verification. Its fast read operations achieve up to 104 MHz, optimized for execute-in-place (XiP) latency in real-time embedded applications. This specification is validated across the full industrial temperature range (-40°C to +85°C) and 2.7–3.6 V supply voltage.
Does the AT25SF641B-DWF support execute-in-place (XiP) functionality?
Yes, the AT25SF641B-DWF is explicitly designed for XiP operation. It supports quad-I/O (1-4-4) and continuous read (0-4-4) command formats that eliminate opcode transmission overhead, enabling deterministic instruction fetch timing. Combined with 104 MHz read speed and low-latency access, the AT25SF641B-DWF allows direct code execution from flash without loading into RAM.
How many one-time programmable (OTP) security registers does the AT25SF641B-DWF include?
The AT25SF641B-DWF includes three 256-byte one-time programmable (OTP) security registers, accessible via dedicated commands (42h program, 48h read, 44h erase). These registers are used to store immutable cryptographic keys, device identifiers, or calibration data, and once programmed, cannot be altered - ensuring firmware integrity and secure boot chain enforcement.
What package type is used for the AT25SF641B-DWF variant?
The AT25SF641B-DWF uses an 8-pad, 5 × 6 × 0.6 mm DFN (dual flat no-lead) package. It is RoHS-compliant, halogen-free, and pin-compatible with industry-standard 8-lead DFN footprints. This compact, surface-mount package supports high-density PCB layouts in space-constrained applications such as portable medical devices and automotive ECUs.
Can the AT25SF641B-DWF suspend and resume erase or program operations?
Yes, the AT25SF641B-DWF supports erase/program suspend (75h) and resume (7Ah) commands. This allows the host processor to temporarily halt long-duration operations - such as a 30-second full-chip erase - to handle time-critical interrupts, then resume from the exact point of suspension. This feature is essential for real-time operating systems where flash operations must not block system responsiveness.
AT25SF641B-DWF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH - NOR (SLC)
- Memory Size:
- 64Mbit
- Memory Organization:
- 8M x 8
- Memory Interface:
- SPI - Quad I/O
- Clock Frequency:
- 104 MHz
- Write Cycle Time - Word, Page:
- 50µs, 30ms
- Access Time:
- 7 ns
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Wafer
AT25SF641B-DWF FAQ
1.How can I place an order for AT25SF641B-DWF through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25SF641B-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 AT25SF641B-DWF reliable?
The price and inventory of AT25SF641B-DWF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25SF641B-DWF is usually 5 days.
3.What payment methods are accepted for AT25SF641B-DWF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25SF641B-DWF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25SF641B-DWF?
AT25SF641B-DWF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25SF641B-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 AT25SF641B-DWF?
For technical support, including AT25SF641B-DWF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25SF641B-DWF requirements.
6.How does Aetrix verify that AT25SF641B-DWF is sourced from the original manufacturer or authorized distributors?
All AT25SF641B-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 AT25SF641B-DWF meets industry standards.
7.What is the process for return or replacement of AT25SF641B-DWF?
All AT25SF641B-DWF units undergo pre-shipment inspection (PSI). If there is an issue with AT25SF641B-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 AT25SF641B-DWF part is unused and in its original packaging.
Return procedure for AT25SF641B-DWF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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