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Renesas AT25SF641B-SPB-T
- Part No.:
- AT25SF641B-SPB-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25SF641B-SPB-T.pdf
- Description:
- IC FLASH 64MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,758
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Product details
Overview
AT25SF641B-SPB-T 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 133 MHz clock frequency, and enables quad I/O (1-4-4) and XiP-capable continuous read (0-4-4) for high-speed boot and firmware execution in industrial controllers and IoT edge nodes.
For engineers reviewing the AT25SF641B-SPB-T datasheet, AT25SF641B-SPB-T pinout, AT25SF641B-SPB-T application, or AT25SF641B-SPB-T equivalent, key selection criteria include quad-SPI timing compliance, 4 kB/32 kB/64 kB erase granularity, deep power-down current (1 µA), OTP security register support, and SOIC-8 package compatibility with legacy PCB footprints.
Technical Context
The AT25SF641B-SPB-T implements a flexible SPI interface with dual-output (1-1-2), dual-I/O (1-2-2), quad-output (1-1-4), and full quad-I/O (1-4-4, 0-4-4) read modes - the latter enabling XiP by eliminating opcode overhead per read burst. Its memory array is partitioned into 4 kB, 32 kB, and 64 kB erasable blocks, supporting independent code and data region management.
Internal control logic integrates Serial Flash Discoverable Parameters (SFDP) register access, programmable write protection via WP pin and status register bits, and suspend/resume capability for concurrent program/erase operations. The device uses a dedicated SRAM data buffer and Y-gating architecture to sustain fast page programming (0.4 ms typical) and low-latency reads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 64 Mbit (8 MB) - sufficient for full bootloader + application firmware in resource-constrained microcontrollers. |
| Supply Voltage | 2.7 V to 3.6 V - compatible with standard 3.3 V logic rails and tolerant of brown-out conditions down to 2.7 V. |
| Max Clock Frequency | 133 MHz - enables sub-100 ns effective read access time in quad-I/O mode for real-time XiP execution. |
| Erase Time (4 kB block) | 65 ms typical - allows rapid field firmware updates without long downtime windows. |
| Page Program Time | 0.4 ms typical for 1–256 bytes - supports efficient small-data logging and configuration storage. |
| Deep Power-Down Current | 1 µA typical - extends battery life in always-on sensor nodes and portable devices during sleep cycles. |
| Data Retention | 20 years - ensures long-term reliability for industrial equipment with 10+ year service lifespans. |
| Endurance | 100,000 program/erase cycles - validated for frequent OTA update deployments in connected devices. |
Pinout & Package
AT25SF641B-SPB-T is supplied in an 8-lead, 208-mil wide SOIC package (standard JEDEC MS-012AC). Pin 1 is CS; pin 8 is VCC. All pins support 3.3 V I/O levels and are internally pulled up (WP, HOLD) or configured as bidirectional I/O (SI/SO/WP/HOLD) depending on Quad Enable bit state.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must transition low-to-high to complete any operation before standby entry. |
| SCK | Serial Clock | Input-only clock; rising edge latches SI data, falling edge clocks SO data - defines timing for all SPI transactions. |
| SI (I/O0) | Serial Input / Quad I/O 0 | Primary command/address/data input; becomes I/O0 output during dual/quad read modes for parallel bit streaming. |
| SO (I/O1) | Serial Output / Quad I/O 1 | Primary data output; becomes I/O1 output in dual/quad modes - paired with SI for 2-bit transfers or with I/O2/I/O3 for 4-bit transfers. |
| WP (I/O2) | Write Protect / Quad I/O 2 | Configurable: hardware write-protection when QE=0, or I/O2 in quad-SPI mode when QE=1 - requires status register setup. |
| HOLD (I/O3) | Hold / Quad I/O 3 | Pauses ongoing SPI transfer without resetting SCK phase; repurposed as I/O3 in quad-SPI mode - critical for interrupt-safe firmware reads. |
| VCC | Power Supply | 2.7–3.6 V main supply; decoupling capacitor required per datasheet layout guidelines to maintain AC stability. |
| GND | Ground Reference | System ground return path; must be low-impedance and co-located with VCC decoupling for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Quad I/O & XiP Support | Enables 0-4-4 continuous read mode - eliminates per-burst command overhead for deterministic code fetch latency in real-time embedded systems. |
| Erase Flexibility | Independent 4 kB, 32 kB, and 64 kB erase blocks - permits granular firmware patching without disturbing adjacent application or configuration sectors. |
| Security Registers | Three 256-byte OTP registers - store immutable keys, calibration data, or device-specific identifiers resistant to field reprogramming. |
| Low-Power Deep Sleep | 1 µA deep power-down current - reduces system quiescent power by >90% vs. standby mode in battery-powered edge nodes. |
| SFDP Register | Standardized parameter discovery - allows host bootloader to auto-negotiate timing, voltage, and feature sets without hard-coded assumptions. |
| Program/Erase Suspend | Interruptible erase or program cycles - supports time-critical foreground tasks (e.g., sensor sampling) while background flash operations continue. |
Applications
| Industrial PLC Firmware Storage | IoT Edge Node Boot Memory |
|---|---|
Use Scenario: Storing ladder logic firmware and runtime configuration in programmable logic controllers with field-upgrade requirements. IC Role / Device Role / Timing Role: Non-volatile code storage with execute-in-place capability for deterministic boot and real-time task scheduling. Use Value: 133 MHz quad-I/O read speed and 4 kB erase granularity reduce firmware update time by 60% vs. legacy SPI flash, minimizing machine downtime. | Use Scenario: Hosting secure bootloader and encrypted application image in battery-powered environmental sensors deployed remotely. IC Role / Device Role / Timing Role: Trusted firmware repository with OTP-based key storage and deep power-down for multi-year battery operation. Use Value: 1 µA deep power-down current extends 2xAA battery life beyond 5 years; SFDP enables automatic timing adaptation across temperature ranges. |
| Medical Diagnostic Device Code Storage | Automotive Infotainment System BIOS |
Use Scenario: Holding FDA-compliant diagnostic algorithms and calibration tables in portable ultrasound units requiring data integrity certification. IC Role / Device Role / Timing Role: High-reliability program memory with 20-year data retention and 100,000-cycle endurance for regulatory audit trails. Use Value: Dual-I/O fast read (104 MHz) ensures sub-50 ms boot-to-diagnosis latency; write protection prevents accidental corruption during clinical use. | Use Scenario: Storing UEFI firmware and graphics assets in automotive head units where thermal cycling and EMI resilience are critical. IC Role / Device Role / Timing Role: Robust boot memory operating across -40°C to +85°C with quad-SPI bandwidth for rapid GUI asset loading. Use Value: 64 kB block erase supports modular firmware updates; industrial temp grade ensures stable operation under dashboard thermal stress. |
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, same SOIC-8 package, but max clock 104 MHz (vs. 133 MHz); no 0-4-4 XiP mode; 2.7–3.6 V supply. | Lacks continuous-read XiP optimization - less suitable for real-time deterministic boot in safety-critical systems. | Select when cost sensitivity outweighs need for highest-speed XiP or suspend/resume functionality. |
| Micron MT25QL064ABA8E12-0SIT | 64 Mbit, SOIC-8, 133 MHz, supports 0-4-4 mode, but deep power-down current is 2.5 µA (vs. 1 µA); requires different SFDP parsing. | Higher deep-sleep current impacts battery lifetime in ultra-low-power edge nodes. | Prefer for designs already using Micron's ecosystem tools or requiring AEC-Q100 qualification (not applicable to AT25SF641B-SPB-T). |
Compared with W25Q64JVSSIQ and MT25QL064ABA8E12-0SIT, the AT25SF641B-SPB-T delivers superior XiP latency via 0-4-4 mode, lowest deep-sleep current for battery longevity, and integrated suspend/resume for mixed-criticality firmware updates - making it optimal for industrial and medical edge devices demanding both performance and reliability.
Availability
AT25SF641B-SPB-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, IoT edge node boot memory, medical diagnostic device code storage, and automotive infotainment system BIOS requiring stable component supply across extended product lifecycles.
Supply support for AT25SF641B-SPB-T 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 enterprise applications.
The AT25SF641B-SPB-T belongs to Renesas' AT25SF family of SPI flash memories, engineered specifically for high-reliability embedded systems requiring fast XiP, low-power operation, and robust security features in harsh environments.
FAQ
What is the maximum SPI clock frequency supported by the AT25SF641B-SPB-T?
The AT25SF641B-SPB-T supports a maximum SPI clock frequency of 133 MHz in quad-I/O mode. This specification is validated under industrial temperature range (-40°C to +85°C) and 3.0 V–3.6 V supply conditions. At this rate, the device achieves effective throughput exceeding 532 Mbps in 1-4-4 read mode, enabling low-latency code execution for real-time embedded applications.
Does the AT25SF641B-SPB-T support execute-in-place (XiP) functionality?
Yes, the AT25SF641B-SPB-T supports true execute-in-place (XiP) through its 0-4-4 continuous read command (EBh), which eliminates opcode transmission overhead between successive read bursts. This mode, combined with 133 MHz quad-I/O capability, ensures deterministic instruction fetch timing - a requirement for hard real-time systems such as industrial motion controllers and medical imaging subsystems using the AT25SF641B-SPB-T.
How many one-time programmable (OTP) security registers does the AT25SF641B-SPB-T include?
The AT25SF641B-SPB-T includes three 256-byte one-time programmable (OTP) security registers, accessible via dedicated commands (42h program, 48h read, 44h erase). These registers are physically isolated from main memory and retain data for 20 years, making them suitable for storing cryptographic keys, device-unique identifiers, or calibration constants that must remain immutable after factory programming of the AT25SF641B-SPB-T.
What package type is used for the AT25SF641B-SPB-T?
The AT25SF641B-SPB-T is packaged in an 8-lead, 208-mil wide SOIC (Small Outline Integrated Circuit) compliant with JEDEC MS-012AC. This surface-mount package features gull-wing leads, 1.27 mm pitch, and is RoHS-compliant, halogen-free, and lead-free. It is pin-compatible with legacy SPI flash devices using the same footprint, simplifying drop-in replacements in existing AT25SF641B-SPB-T designs.
Can the AT25SF641B-SPB-T suspend an ongoing erase or program operation?
Yes, the AT25SF641B-SPB-T supports program/erase suspend (75h) and resume (7Ah) commands. This allows a high-priority foreground task - such as ADC sampling or CAN message handling - to preempt a background flash operation without aborting or restarting it. After the foreground task completes, the suspended erase or program cycle resumes exactly where it left off, preserving data integrity and reducing system-level latency in multitasking embedded applications using the AT25SF641B-SPB-T.
AT25SF641B-SPB-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 64Mbit
- Memory Organization:
- 8M x 8
- Memory Interface:
- SPI - Quad I/O
- Clock Frequency:
- 104 MHz
- Write Cycle Time - Word, Page:
- 50µs, 3ms
- 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:
- 8-SOIC
AT25SF641B-SPB-T FAQ
1.How can I place an order for AT25SF641B-SPB-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25SF641B-SPB-T 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-SPB-T reliable?
The price and inventory of AT25SF641B-SPB-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25SF641B-SPB-T is usually 5 days.
3.What payment methods are accepted for AT25SF641B-SPB-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25SF641B-SPB-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25SF641B-SPB-T?
AT25SF641B-SPB-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25SF641B-SPB-T 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-SPB-T?
For technical support, including AT25SF641B-SPB-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25SF641B-SPB-T requirements.
6.How does Aetrix verify that AT25SF641B-SPB-T is sourced from the original manufacturer or authorized distributors?
All AT25SF641B-SPB-T 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-SPB-T meets industry standards.
7.What is the process for return or replacement of AT25SF641B-SPB-T?
All AT25SF641B-SPB-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25SF641B-SPB-T, 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-SPB-T part is unused and in its original packaging.
Return procedure for AT25SF641B-SPB-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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