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Renesas AT25SF321B-DWF
- Part No.:
- AT25SF321B-DWF
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- Die
- Datasheet:
-
AT25SF321B-DWF.pdf
- Description:
- 32 MBIT, 3.0 (2.7V TO 3.6V), -40
- Quantity:
- Payment:
- Shipping:
Inventory:4,804
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Product details
Overview
AT25SF321B-DWF from Renesas Electronics is a 32-Mbit SPI serial flash memory IC designed for embedded boot code and XiP (execute-in-place) applications. It operates from a single 2.7–3.6 V supply, supports SPI modes 0/3, delivers up to 133 MHz read speed in quad I/O (1-4-4) mode, and features 4 kB/32 kB/64 kB block erase with typical times of 55 ms / 120 ms / 200 ms. It is used in industrial controllers requiring fast, reliable nonvolatile storage with hardware write protection.
For engineers reviewing the AT25SF321B-DWF datasheet, AT25SF321B-DWF pinout, AT25SF321B-DWF application, or AT25SF321B-DWF equivalent, key selection criteria include quad-SPI timing compliance, deep power-down current (1 µA), OTP security register support, and JEDEC-standard SFDP register access for automated configuration.
Technical Context
The AT25SF321B-DWF implements a flexible SPI interface supporting standard (1-1-1), 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 formats - enabling scalable bandwidth from basic firmware updates to high-speed XiP execution. Its memory array is organized into 4 kB blocks (1024 total), with page programming granularity of 1–256 bytes and full-chip erase capability.
Hardware-level protection includes user-definable protected regions at memory start/end, WP-pin-controlled status register locking, and three 256-byte one-time programmable (OTP) security registers. The device integrates Serial Flash Discoverable Parameters (SFDP) v1.6 for host-driven configuration and supports program/erase suspend/resume for real-time system responsiveness.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (4 MB); sufficient for boot firmware + application code in resource-constrained microcontrollers. |
| Max Read Frequency | 133 MHz in quad-I/O (1-4-4) mode; enables sub-µs instruction fetch latency for XiP operation. |
| Erase Granularity | 4 kB / 32 kB / 64 kB blocks and full chip; allows selective firmware patching without erasing entire image. |
| Page Program Time | 0.4 ms typical for 1–256 bytes; supports rapid field updates and runtime parameter storage. |
| Power Consumption | 1 µA deep power-down current; extends battery life in always-on IoT edge nodes. |
| Data Retention | 20 years at 85 °C; meets long-lifecycle requirements for industrial automation and medical devices. |
| Endurance | 100,000 program/erase cycles; supports frequent firmware over-the-air (OTA) updates. |
Pinout & Package
AT25SF321B-DWF is packaged in an 8-pad, 5 × 6 × 0.6 mm DFN (Dual Flat No-lead) package with wettable flanks, optimized for automated optical inspection (AOI) and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must transition low-to-high to complete commands and enter standby mode. |
| SCK | Serial Clock | Input clock driving all SPI operations; rising edge latches input data (SI), falling edge clocks output data (SO). |
| SI (I/O0) | Serial Input / Quad I/O 0 | Primary command/address/data input; becomes bidirectional I/O0 during dual/quad I/O reads. |
| SO (I/O1) | Serial Output / Quad I/O 1 | Primary data output; becomes bidirectional I/O1 during dual/quad I/O reads. |
| WP (I/O2) | Write Protect / Quad I/O 2 | Configurable: hardware write-protection when QE=0, or I/O2 in quad mode when QE=1. |
| HOLD (I/O3) | Hold / Quad I/O 3 | Pauses ongoing SPI transfer without resetting state; repurposed as I/O3 in quad mode when QE=1. |
| VCC | Power Supply | Single 2.7–3.6 V supply; eliminates need for level shifters in 3.3 V systems. |
| GND | Ground Reference | System ground return path; requires low-impedance connection for stable read/write margins. |
Key Features
| Feature | Design Value |
|---|---|
| Quad-I/O Fast Read (1-4-4) | Enables 4-bit-per-clock data throughput, reducing instruction fetch time by ~4× vs. standard SPI. |
| Continuous Read Mode (0-4-4) | Eliminates repeated opcode transmission, improving sustained read bandwidth for large code segments. |
| Program/Erase Suspend/Resume | Allows host CPU to service interrupts or real-time tasks mid-operation without aborting flash writes. |
| 3 × 256-byte OTP Security Registers | Stores immutable keys, calibration data, or device-unique identifiers for secure boot and anti-cloning. |
| JEDEC SFDP v1.6 Compliance | Permits automatic detection of timing parameters, erase sizes, and feature sets by host bootloader. |
Applications
| Industrial PLC Firmware Storage | IoT Edge Node OTA Updates |
|---|---|
Use Scenario: Storing and executing ladder logic firmware in programmable logic controllers with deterministic boot timing. IC Role / Device Role / Timing Role: Primary boot memory providing XiP execution via quad-I/O (1-4-4) reads at 133 MHz to meet <100 ms cold-start requirement. Use Value: Eliminates external RAM copy step, reduces BOM cost, and ensures consistent boot latency across temperature (-40°C to 85°C). | Use Scenario: Securely storing delta firmware patches and cryptographic keys in battery-powered sensor gateways. IC Role / Device Role / Timing Role: Nonvolatile storage with 1 µA deep power-down current and OTP registers for key binding. Use Value: Extends 10-year battery life while enabling authenticated, encrypted OTA updates using hardware-protected keys. |
| Medical Diagnostic Device Boot Code | Automotive ADAS Camera Module |
Use Scenario: Hosting certified boot loader and safety-critical application code in portable ultrasound units. IC Role / Device Role / Timing Role: High-reliability flash with 20-year data retention and 100,000-cycle endurance for regulatory-compliant firmware lifecycle. Use Value: Meets IEC 62304 Class C software requirements without external ECC or wear-leveling controller. | Use Scenario: Storing camera ISP firmware and calibration tables in automotive surround-view systems. IC Role / Device Role / Timing Role: Dual/quad I/O interface supporting burst reads for real-time image pipeline initialization. Use Value: Achieves <50 ms camera startup time via continuous-read mode and 133 MHz quad-I/O bandwidth. |
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 W25Q32JW | 32 Mbit density, 133 MHz max, but uses different SFDP layout and lacks 0-4-4 continuous read mode. | Requires host firmware adaptation for command set and timing; no native continuous read optimization. | Select when existing Winbond ecosystem integration exists and continuous read is not required. |
| Micron MT25QL32ABA | Same density and 133 MHz rating, but supports octal DTR mode (not supported by AT25SF321B-DWF) and has higher deep power-down current (2.5 µA). | Better suited for systems planning future octal migration; less optimal for ultra-low-power edge nodes. | Select when roadmap includes octal interface or when Micron's automotive qualification (AEC-Q100 Grade 3) is mandatory. |
Compared with W25Q32JW and MT25QL32ABA, the AT25SF321B-DWF uniquely combines 0-4-4 continuous read mode, 1 µA deep power-down, and JEDEC SFDP v1.6 compliance - making it optimal for cost-sensitive, battery-constrained XiP designs where minimal host driver changes are required.
Availability
AT25SF321B-DWF is available at Aetrix Electronics and suitable for industrial PLC firmware storage, IoT edge node OTA updates, and medical diagnostic device boot code requiring stable component supply across extended product lifecycles.
Supply support for AT25SF321B-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, infrastructure, and IoT markets.
The AT25SF321B-DWF belongs to Renesas' AT25SF family of SPI flash memories engineered for robustness, low-power operation, and seamless XiP integration in space- and energy-constrained embedded systems.
FAQ
What is the maximum clock frequency supported by AT25SF321B-DWF in quad-I/O mode?
The AT25SF321B-DWF supports a maximum clock frequency of 133 MHz in quad-I/O (1-4-4) mode, as specified in the AC characteristics table of the official datasheet. This enables high-throughput instruction fetch for execute-in-place (XiP) applications. The device maintains timing compliance across its full operating temperature range of -40°C to +85°C, ensuring reliable performance in industrial environments. AT25SF321B-DWF achieves this speed without requiring external voltage regulators or level shifters due to its native 2.7–3.6 V supply range.
Does AT25SF321B-DWF support continuous read mode, and how does it improve performance?
Yes, AT25SF321B-DWF supports continuous read mode using the 0-4-4 command format, which eliminates the need to retransmit the read opcode for consecutive address locations. This reduces bus overhead and increases effective read bandwidth - especially beneficial for sequential code execution in XiP systems. Continuous read mode is enabled after issuing the initial 0-4-4 command and remains active until terminated. AT25SF321B-DWF implements this feature with hardware-level address wrap control (8/16/32/64-byte), minimizing host CPU intervention during large-block reads.
How many one-time programmable (OTP) security registers does AT25SF321B-DWF provide, and what are their use cases?
AT25SF321B-DWF provides three 256-byte one-time programmable (OTP) security registers, accessible via dedicated SFDP-mapped commands (42h/44h/48h). These registers are used to store immutable data such as device-unique identifiers, cryptographic keys, calibration constants, or firmware version locks. Once programmed, contents cannot be altered - enforcing secure boot integrity and preventing cloning. AT25SF321B-DWF supports independent erase and program operations per register, allowing selective provisioning during manufacturing without affecting other security zones.
What package type is used for AT25SF321B-DWF, and what are its board-level advantages?
AT25SF321B-DWF uses an 8-pad, 5 × 6 × 0.6 mm DFN (Dual Flat No-lead) package with wettable flanks. This compact footprint saves PCB area versus SOIC variants while enabling automated optical inspection (AOI) of solder joints - critical for high-reliability industrial and medical assemblies. The DFN's low thermal resistance improves heat dissipation during sustained programming cycles, and its lead-free, RoHS-compliant construction meets global environmental compliance requirements. AT25SF321B-DWF's DFN variant is pin-compatible with other members of the AT25SF family sharing the same pad layout.
Can AT25SF321B-DWF be used for execute-in-place (XiP) applications, and what features enable this capability?
Yes, AT25SF321B-DWF is explicitly designed for execute-in-place (XiP) applications, as confirmed in its Product Overview section. Key enablers include quad-I/O (1-4-4) and continuous read (0-4-4) modes that deliver high bandwidth with low command overhead, 133 MHz maximum clock frequency for sub-microsecond instruction fetch, and hardware-supported erase suspend/resume to avoid CPU stalls during background flash operations. AT25SF321B-DWF also includes SFDP v1.6 compliance, allowing host bootloaders to auto-configure timing and command parameters - simplifying XiP integration across diverse processor platforms.
AT25SF321B-DWF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- -
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH - NOR (SLC)
- Memory Size:
- 32Mbit
- Memory Organization:
- 4M x 8
- Memory Interface:
- SPI - Quad I/O
- Clock Frequency:
- 108 MHz
- Write Cycle Time - Word, Page:
- 50µs, 3.4ms
- 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
AT25SF321B-DWF FAQ
1.How can I place an order for AT25SF321B-DWF through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25SF321B-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 AT25SF321B-DWF reliable?
The price and inventory of AT25SF321B-DWF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25SF321B-DWF is usually 5 days.
3.What payment methods are accepted for AT25SF321B-DWF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25SF321B-DWF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25SF321B-DWF?
AT25SF321B-DWF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25SF321B-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 AT25SF321B-DWF?
For technical support, including AT25SF321B-DWF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25SF321B-DWF requirements.
6.How does Aetrix verify that AT25SF321B-DWF is sourced from the original manufacturer or authorized distributors?
All AT25SF321B-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 AT25SF321B-DWF meets industry standards.
7.What is the process for return or replacement of AT25SF321B-DWF?
All AT25SF321B-DWF units undergo pre-shipment inspection (PSI). If there is an issue with AT25SF321B-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 AT25SF321B-DWF part is unused and in its original packaging.
Return procedure for AT25SF321B-DWF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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