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Renesas AT25QF641B-SHB-B
- Part No.:
- AT25QF641B-SHB-B
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25QF641B-SHB-B.pdf
- Description:
- IC FLASH 64MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,234
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Product details
Overview
AT25QF641B-SHB-B from Renesas Electronics is a 64-Mbit SPI serial flash memory IC supporting Execute-in-Place (XiP), quad I/O (1-4-4), and dual I/O (1-2-2) operations with up to 133 MHz read speed, 2.7–3.6 V single-supply operation, and industrial temperature range (−40 °C to +85 °C). It enables fast boot code loading and real-time firmware execution in resource-constrained embedded systems.
For engineers reviewing the AT25QF641B-SHB-B datasheet, AT25QF641B-SHB-B pinout, AT25QF641B-SHB-B application, or AT25QF641B-SHB-B equivalent, key selection criteria include XiP support, 4 kB sector erase time (65 ms typ), OTP security registers, SFDP compliance, and SOIC-8 (208-mil) package compatibility with legacy PCB layouts.
Technical Context
The AT25QF641B-SHB-B implements a flexible SPI interface supporting modes 0 and 3, with configurable I/O width (1-, 2-, or 4-line) via status register control. Its internal architecture includes a 4 Mbit physical block size, SRAM data buffer, and Y/X-decoder array enabling efficient page (256 B) and sector (4 kB) access.
Command execution is managed by dedicated control logic supporting suspend/resume during program/erase cycles, deep power-down (1 µA typ), and hardware write protection via WP pin or status register bits. Security is enhanced by three 1024-byte OTP registers and unique ID read (4Bh command).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 64 Mbit (8 MB) - sufficient for full MCU boot images and firmware updates in industrial controllers. |
| Read Speed | Up to 133 MHz (Quad I/O) - enables sub-100 ns effective access time for XiP execution. |
| Erase Granularity | 4 kB sectors (65 ms typ), 32/64 kB blocks (150/240 ms typ), full chip (30 s typ) - balances update flexibility and wear leveling. |
| Programming | 1–256 byte page program (0.4 ms typ) - supports fine-grained configuration storage without bulk overhead. |
| Power Consumption | 1 µA deep power-down, 14 µA standby, 3 mA active read - suitable for battery-backed IoT edge nodes. |
| Data Retention & Endurance | 20 years retention, 100,000 program/erase cycles - meets long-life requirements for industrial automation firmware storage. |
| Operating Voltage | 2.7 V to 3.6 V - compatible with 3.3 V system rails and tolerant of brown-out conditions. |
Pinout & Package
AT25QF641B-SHB-B is supplied in an 8-pin Wide Body SOIC (208 mil) package per JEDEC MS-012, with gull-wing leads and 1.27 mm pitch. Pin 1 is marked with a notch or dot; thermal pad is not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must transition high-to-low to initiate commands and low-to-high to terminate - critical for multi-device SPI bus arbitration. |
| SCK | Serial Clock | Master-generated clock; rising edge latches SI input, falling edge clocks SO output - defines maximum 133 MHz timing budget. |
| SI (I/O0) | Serial Input / Quad I/O Line 0 | Primary command/address/data input; becomes bidirectional I/O0 in dual/quad modes - requires pull-up if unused in quad mode. |
| SO (I/O1) | Serial Output / Quad I/O Line 1 | Primary data output; becomes bidirectional I/O1 in dual/quad modes - high-impedance when CS is high to prevent bus contention. |
| WP (I/O2) | Write Protect / Quad I/O Line 2 | Hardware write lock for status registers when QE=0; functions as I/O2 in quad mode - cannot serve both roles simultaneously. |
| HOLD (I/O3) | Communication Hold / Quad I/O Line 3 | Pauses ongoing SPI transfer without resetting state machine; becomes I/O3 in quad mode - enables low-latency interrupt handling. |
| VCC | Power Supply | 2.7–3.6 V supply; requires local 100 nF decoupling near pin to suppress switching noise during fast reads. |
| GND | Ground Reference | System ground return path; must be low-impedance and routed adjacent to VCC for stable core voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Execute-in-Place (XiP) Support | Enables direct CPU instruction fetch from flash via 0-4-4 continuous read mode, eliminating RAM copy overhead and reducing boot latency. |
| Serial Flash Discoverable Parameter (SFDP) | Standardized JEDEC JESD216 register allows automatic configuration of read commands, timing, and density by host bootloader without hard-coded parameters. |
| OTP Security Registers | Three 1024-byte one-time programmable areas store cryptographic keys or device-specific secrets that survive full chip erase. |
| Erase/Program Suspend & Resume | Allows interruption of background erase or program operations to service time-critical reads, then resume without data loss or timing penalty. |
| User-Definable Memory Protection | Configurable top/bottom protected regions (via status register) prevent accidental overwrite of boot code or calibration data during field updates. |
Applications
| Industrial PLC Firmware Storage | Automotive Infotainment Boot Memory |
|---|---|
Use Scenario: Storing firmware images and configuration tables for programmable logic controllers operating in harsh environments. IC Role / Device Role / Timing Role: Non-volatile program memory providing XiP-capable boot code and field-upgradable application binaries. Use Value: 20-year data retention and 100,000-cycle endurance ensure reliable operation over 15+ year equipment lifecycles without refresh. |
Use Scenario: Hosting boot loader and OS kernel for head-unit microcontrollers requiring rapid startup and secure firmware validation. IC Role / Device Role / Timing Role: Primary SPI flash executing trusted boot code directly from memory using 133 MHz quad I/O reads. Use Value: Continuous read wrap (8/16/32/64-byte) eliminates inter-byte command overhead, cutting boot time by ≥35% vs standard SPI reads. |
| Medical Device Calibration Data | Smart Meter Firmware Update Storage |
Use Scenario: Retaining factory-calibrated sensor coefficients and regulatory compliance settings across power cycles and firmware updates. IC Role / Device Role / Timing Role: Secure, write-protected non-volatile storage with OTP registers for immutable calibration signatures. Use Value: WP pin + status register protection prevents accidental corruption during field service, meeting IEC 62304 Class C requirements. |
Use Scenario: Storing delta firmware patches and rollback images for over-the-air (OTA) updates in utility smart meters with constrained bandwidth. IC Role / Device Role / Timing Role: High-reliability flash supporting atomic sector erase and page program for safe dual-bank update schemes. Use Value: 4 kB sector granularity enables precise patch application without erasing entire 8 MB image, reducing update window by 92%. |
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, 3.3 V, SOIC-8; supports 133 MHz Quad I/O but lacks SFDP v1.6 and OTP registers. | No built-in SFDP auto-configuration; requires manual register setup; no hardware-based secret key storage. | Select when cost sensitivity outweighs need for standardized parameter discovery or cryptographic key isolation. |
| Macronix MX25L6433FZNI-10G | 64 Mbit, 3.3 V, SOIC-8; supports 104 MHz Quad I/O, deep power-down (1 µA), but no XiP-optimized continuous read mode. | Limited burst wrap support (no 0-4-4); higher active current (5 mA typ) reduces battery life in portable meters. | Select for legacy designs already validated with MX25L series; avoid where XiP latency or ultra-low standby power is critical. |
Compared with W25Q64JVSSIQ and MX25L6433FZNI-10G, the AT25QF641B-SHB-B uniquely combines SFDP v1.6 compliance, OTP security registers, and 0-4-4 continuous read for true XiP efficiency-making it optimal for next-generation secure, low-power embedded boot systems.
Availability
AT25QF641B-SHB-B is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive infotainment boot memory, and medical device calibration data requiring stable component supply and long-term lifecycle assurance.
Supply support for AT25QF641B-SHB-B 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 AT25QF641B belongs to Renesas' high-performance serial flash product line, engineered for robust XiP execution, secure firmware storage, and seamless integration into safety-critical embedded systems.
FAQ
What is the maximum SPI clock frequency supported by the AT25QF641B-SHB-B in Quad I/O mode?
The AT25QF641B-SHB-B supports up to 133 MHz in Quad I/O (1-4-4) and Quad Output (1-1-4) modes, enabling high-throughput data streaming for Execute-in-Place applications. This frequency is specified under standard 3.3 V supply and industrial temperature conditions, and requires proper PCB layout with controlled impedance traces and minimal stub length to maintain signal integrity.
Does the AT25QF641B-SHB-B support Execute-in-Place (XiP) operation, and what features enable it?
Yes, the AT25QF641B-SHB-B explicitly supports XiP via its 0-4-4 continuous read command (EBh), which eliminates repeated opcode transmission and enables seamless instruction fetch. Combined with 133 MHz quad I/O bandwidth and low-latency page access, the AT25QF641B-SHB-B delivers deterministic execution timing suitable for real-time embedded applications without RAM buffering.
How many One-Time Programmable (OTP) security registers does the AT25QF641B-SHB-B include, and what is their capacity?
The AT25QF641B-SHB-B integrates three independent 1024-byte OTP security registers, totaling 3 kB of write-once memory. These registers are used to store cryptographic keys, device identifiers, or calibration secrets that persist through full chip erase and power cycles-providing hardware-enforced immutability for security-critical data.
What package type is used for the AT25QF641B-SHB-B, and is it pin-compatible with legacy SOIC-8 flash devices?
The AT25QF641B-SHB-B uses an 8-pin Wide Body SOIC (208 mil) package compliant with JEDEC MS-012, featuring 1.27 mm lead pitch and standard gull-wing leads. It is pin-compatible with industry-standard SOIC-8 serial flash devices, allowing drop-in replacement in existing layouts without PCB revision-provided voltage and timing margins align with the 2.7–3.6 V operating range.
Can the AT25QF641B-SHB-B suspend an ongoing erase or program operation to handle a higher-priority read request?
Yes, the AT25QF641B-SHB-B supports program/erase suspend (75h) and resume (7Ah) commands. When activated, it pauses background operations within 2 µs, allowing immediate servicing of read commands. After completion, the suspended operation resumes from the exact point of interruption-ensuring deterministic latency for time-critical applications like motor control or sensor sampling.
AT25QF641B-SHB-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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, 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
AT25QF641B-SHB-B FAQ
1.How can I place an order for AT25QF641B-SHB-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25QF641B-SHB-B 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 AT25QF641B-SHB-B reliable?
The price and inventory of AT25QF641B-SHB-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25QF641B-SHB-B is usually 5 days.
3.What payment methods are accepted for AT25QF641B-SHB-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25QF641B-SHB-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25QF641B-SHB-B?
AT25QF641B-SHB-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25QF641B-SHB-B 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 AT25QF641B-SHB-B?
For technical support, including AT25QF641B-SHB-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25QF641B-SHB-B requirements.
6.How does Aetrix verify that AT25QF641B-SHB-B is sourced from the original manufacturer or authorized distributors?
All AT25QF641B-SHB-B 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 AT25QF641B-SHB-B meets industry standards.
7.What is the process for return or replacement of AT25QF641B-SHB-B?
All AT25QF641B-SHB-B units undergo pre-shipment inspection (PSI). If there is an issue with AT25QF641B-SHB-B, 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 AT25QF641B-SHB-B part is unused and in its original packaging.
Return procedure for AT25QF641B-SHB-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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