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Renesas AT25SF641B-SHB-T
- Part No.:
- AT25SF641B-SHB-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25SF641B-SHB-T.pdf
- Description:
- IC FLASH 64MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,759
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Product details
Overview
AT25SF641B-SHB-T from Renesas Electronics is a 64-Mbit SPI serial flash memory IC designed for embedded boot code and XiP (execute-in-place) applications in industrial and connected devices. 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 enables quad I/O (1-4-4) and continuous read for low-latency firmware access.
For engineers reviewing the AT25SF641B-SHB-T datasheet, AT25SF641B-SHB-T pinout, AT25SF641B-SHB-T application, or AT25SF641B-SHB-T equivalent, key selection criteria include quad-SPI timing compliance, 4 kB/32 kB/64 kB erase granularity, OTP security register support, deep power-down current (1 µA), and industrial temperature range (–40°C to +85°C).
Technical Context
The AT25SF641B-SHB-T implements a flexible SPI interface with 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) read modes - all configurable via status register bits and command opcodes. Its memory array is organized into 4 kB blocks (2048 total), supporting page program (1–256 bytes), block erase (4/32/64 kB), and full-chip erase.
Internal control logic integrates Serial Flash Discoverable Parameters (SFDP) for automatic configuration, three 256-byte OTP security registers, and hardware write protection via WP pin and status register lock bits. Erase/program suspend-resume capability enables concurrent background operations without host interruption.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 64 Mbit (8 MB) - sufficient for full MCU boot images and firmware overlays in resource-constrained systems. |
| Supply Voltage | 2.7 V – 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 high-throughput data streaming during XiP or firmware updates. |
| Fast Read Speed | 104 MHz - reduces instruction fetch latency in execute-in-place configurations. |
| Erase Time (4 kB block) | 65 ms typical - balances speed and endurance for frequent field updates. |
| Endurance | 100,000 program/erase cycles - supports long-term reliability in industrial logging or configuration storage. |
| Data Retention | 20 years - ensures firmware integrity over product lifetime without refresh. |
| Deep Power-Down Current | 1 µA typical - critical for battery-backed or energy-harvesting IoT endpoints. |
Pinout & Package
AT25SF641B-SHB-T is packaged in an 8-pin, 208-mil wide SOIC (Small Outline Integrated Circuit) with industry-standard pinout and lead spacing. This package supports reflow soldering and is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; initiates and terminates all SPI transactions; internal pull-up recommended for robust power-up behavior. |
| SCK | Serial Clock | Master-generated clock; rising edge latches input (SI), falling edge clocks output (SO); defines timing for all commands and data transfers. |
| SI (I/O0) | Serial Input / Quad I/O Line 0 | Primary command/address/data input; becomes bidirectional I/O0 in dual/quad I/O modes; ignored when CS is high. |
| SO (I/O1) | Serial Output / Quad I/O Line 1 | Primary data output; becomes bidirectional I/O1 in dual/quad I/O modes; high-impedance when CS is deasserted. |
| WP (I/O2) | Write Protect / Quad I/O Line 2 | Configurable: hardware write-protection when QE=0, or I/O2 in quad mode when QE=1; internally pulled high. |
| HOLD (I/O3) | Hold / Quad I/O Line 3 | Pauses ongoing SPI transfer without resetting state; becomes I/O3 in quad mode; internally pulled high. |
| VCC | Power Supply | Single 2.7–3.6 V supply; powers core logic, memory array, and I/O buffers. |
| GND | Ground | Reference return path for VCC and all signal pins; must be low-impedance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Quad I/O (1-4-4) & Continuous Read (0-4-4) | Enables zero-command-overhead sequential reads at up to 104 MHz, reducing CPU wait states during XiP execution. |
| Flexible Erase Architecture | Supports 4 kB, 32 kB, 64 kB, and full-chip erase - allows independent update of bootloader, application, and configuration sectors. |
| Three 256-byte OTP Security Registers | Provides immutable storage for keys, certificates, or device-specific identifiers - essential for secure boot and anti-cloning. |
| Erase/Program Suspend-Resume | Permits host to pause long-running erase or program operations to service higher-priority interrupts, then resume without data loss. |
| Serial Flash Discoverable Parameters (SFDP) | Allows automatic detection of device capabilities (timing, commands, protection) by host bootloader - eliminates hard-coded initialization sequences. |
| User-Definable Memory Protection | Configurable protected region at start or end of array, controlled via WP pin or status register - prevents accidental overwrite of critical firmware. |
Applications
| Industrial PLC Firmware Storage | IoT Edge Device Boot Code |
|---|---|
Use Scenario: Storing and executing real-time control firmware in programmable logic controllers with strict uptime requirements. IC Role / Device Role / Timing Role: Primary boot memory and XiP execution source; provides deterministic read latency under variable load. Use Value: 104 MHz fast read and 0-4-4 continuous read minimize instruction fetch stalls, improving deterministic loop timing in motion control applications. |
Use Scenario: Hosting secure boot loader and OTA update image in battery-powered smart sensors deployed in remote locations. IC Role / Device Role / Timing Role: Trusted firmware repository with hardware-enforced write protection and OTP key storage. Use Value: 1 µA deep power-down current extends battery life; OTP registers store root-of-trust keys immune to software tampering. |
| Medical Diagnostic Instrument BIOS | Automotive Infotainment System Code Storage |
Use Scenario: Storing certified diagnostic firmware and calibration data in Class II medical devices requiring 20-year data retention. IC Role / Device Role / Timing Role: Nonvolatile code and parameter storage with JEDEC-standard ID and SFDP for traceable firmware validation. Use Value: 20-year data retention and JEDEC Manufacturer/Device ID ensure regulatory compliance and field-replaceable firmware authenticity. |
Use Scenario: Holding infotainment OS kernel and UI assets in automotive head units operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: High-speed code storage enabling rapid boot and seamless UI rendering via quad-I/O read bursts. Use Value: 133 MHz max clock and quad-I/O support deliver >50 MB/s effective throughput, accelerating GUI asset loading from flash. |
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 W25Q64JW-QI | 64 Mbit, 1.8 V supply, 133 MHz max clock, but lacks 0-4-4 continuous read mode and has only two 256-byte OTP registers. | Lower voltage operation suits ultra-low-power microcontrollers; missing 0-4-4 limits XiP performance in high-clock-rate hosts. | Select W25Q64JW-QI only if 1.8 V compatibility is mandatory and continuous-read optimization is not required. |
| Macronix MX25L6433FZNI-10G | 64 Mbit, 3.3 V supply, 104 MHz fast read, supports 1-4-4 but no 0-4-4 mode; endurance rated at 100k cycles, same retention. | Compatible pinout and voltage; however, absence of 0-4-4 requires opcode retransmission every 64 bytes, increasing host overhead. | Choose MX25L6433FZNI-10G where legacy driver support exists but XiP latency is less critical than cost. |
Compared with W25Q64JW-QI and MX25L6433FZNI-10G, the AT25SF641B-SHB-T uniquely delivers 0-4-4 continuous read for true zero-overhead XiP execution, plus three OTP registers for enhanced secure boot - making it optimal for safety-critical and high-performance embedded systems.
Availability
AT25SF641B-SHB-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, IoT edge device boot code, and automotive infotainment system code storage requiring stable component supply and long-term lifecycle assurance.
Supply support for AT25SF641B-SHB-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 IoT markets.
The AT25SF641B belongs to Renesas' high-performance serial flash memory product line, engineered specifically for execute-in-place (XiP) and secure firmware storage in mission-critical embedded systems.
FAQ
What is the maximum SPI clock frequency supported by the AT25SF641B-SHB-T?
The AT25SF641B-SHB-T supports a maximum SPI clock frequency of 133 MHz, enabling high-bandwidth data transfers during firmware updates or XiP execution. This specification applies to all supported read modes including quad-I/O (1-4-4) and continuous read (0-4-4), as confirmed in the AC Characteristics section of the official datasheet (Rev. K, Table 13.3).
Does the AT25SF641B-SHB-T support execute-in-place (XiP) operation?
Yes, the AT25SF641B-SHB-T explicitly supports XiP through optimized features: quad-SPI (1-4-4), continuous read mode (0-4-4), and 104 MHz fast read speed. These reduce instruction fetch latency and eliminate command overhead, allowing direct CPU execution from flash memory - a core design objective stated on page 6 of the AT25SF641B datasheet.
How many One-Time Programmable (OTP) security registers does the AT25SF641B-SHB-T have?
The AT25SF641B-SHB-T includes three 256-byte One-Time Programmable (OTP) security registers, accessible via dedicated commands (42h/48h/44h). These registers provide immutable storage for cryptographic keys, device IDs, or secure boot parameters - a feature highlighted in the "Features" section (page 1) and detailed in Section 10 of the datasheet.
What erase granularities are available on the AT25SF641B-SHB-T?
The AT25SF641B-SHB-T supports four erase granularities: 4 kB block erase (20h), 32 kB block erase (52h), 64 kB block erase (D8h), and full chip erase (60h/C7h). This architecture - documented in Table 2 (page 10) and Section 4 - enables selective firmware updates while preserving configuration or calibration data in adjacent blocks.
Is the AT25SF641B-SHB-T compatible with standard SPI mode 0 and mode 3?
Yes, the AT25SF641B-SHB-T is fully compatible with SPI modes 0 and 3, as specified in the "Features" section (page 1) and verified in Figure 4 (page 12) of the datasheet. Mode 0 (CPOL=0, CPHA=0) and mode 3 (CPOL=1, CPHA=1) define clock polarity and phase alignment for reliable communication with diverse host controllers.
AT25SF641B-SHB-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:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH - NOR
- Memory Size:
- 64Mbit
- Memory Organization:
- 8M x 8
- Memory Interface:
- SPI - Quad I/O
- Clock Frequency:
- 108 MHz
- Write Cycle Time - Word, Page:
- 50µs, 3ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25SF641B-SHB-T FAQ
1.How can I place an order for AT25SF641B-SHB-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25SF641B-SHB-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-SHB-T reliable?
The price and inventory of AT25SF641B-SHB-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-SHB-T is usually 5 days.
3.What payment methods are accepted for AT25SF641B-SHB-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25SF641B-SHB-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25SF641B-SHB-T?
AT25SF641B-SHB-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25SF641B-SHB-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-SHB-T?
For technical support, including AT25SF641B-SHB-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25SF641B-SHB-T requirements.
6.How does Aetrix verify that AT25SF641B-SHB-T is sourced from the original manufacturer or authorized distributors?
All AT25SF641B-SHB-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-SHB-T meets industry standards.
7.What is the process for return or replacement of AT25SF641B-SHB-T?
All AT25SF641B-SHB-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25SF641B-SHB-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-SHB-T part is unused and in its original packaging.
Return procedure for AT25SF641B-SHB-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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