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Renesas AT25FF321A-DWF
- Part No.:
- AT25FF321A-DWF
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- Die
- Datasheet:
-
AT25FF321A-DWF.pdf
- Description:
- 32 MBIT, WIDE VCC (1.65V TO 3.6V
- Quantity:
- Payment:
- Shipping:
Inventory:3,020
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Product details
Overview
AT25FF321A-DWF from Renesas Electronics is a 32-Mbit SPI serial flash memory in die-in-wafer form, supporting 1.65 V–3.6 V operation, quad I/O (1-4-4), XiP mode, and 133 MHz max clock frequency. It delivers 4-kByte/32-kByte/64-kByte block erase, 100,000 program/erase cycles, and ultra-low 5–7 nA deep power-down current for battery-sensitive embedded systems.
For engineers reviewing the AT25FF321A-DWF datasheet, AT25FF321A-DWF pinout, AT25FF321A-DWF application, or AT25FF321A-DWF equivalent, key selection criteria include multi-I/O timing compatibility, XiP read latency, OTP security register configuration, and wafer-level integration requirements for custom packaging or chip-on-board designs.
Technical Context
The AT25FF321A-DWF implements a flexible SPI interface with support for standard (1-1-1), dual-output (1-1-2), quad-output (1-1-4), and full quad I/O (1-4-4, 0-4-4) transfer modes. Its architecture includes a 256-byte SRAM buffer, five status registers with non-volatile/volatile options, and hardware reset compliance per JEDEC standards.
Memory protection is implemented via individual block lock/unlock commands (36h/39h), global lock (7Eh), and user-definable protected regions at memory start/end. Erase/program suspend/resume (75h/B0h, 7Ah/D0h) enables concurrent background operations without host interruption.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (4 MB) - sufficient for firmware images, boot code, and configuration data in resource-constrained microcontrollers. |
| Interface Standard | SPI-compatible with modes 0 and 3 - ensures interoperability with ARM Cortex-M, RISC-V, and legacy MCU host controllers. |
| Max Clock Frequency | 133 MHz (quad I/O) - enables up to 66.5 MB/s effective read throughput in 0-4-4 continuous read mode. |
| Erase Granularity | 4-kByte / 32-kByte / 64-kByte blocks + full chip - allows fine-grained firmware updates without disturbing adjacent application sections. |
| Endurance & Retention | 100,000 program/erase cycles; 20-year data retention - validated for long-life industrial control and automotive telematics deployments. |
| Power Modes | 7 µA deep power-down; 5–7 nA ultra-deep power-down - supports multi-year battery life in IoT edge sensors and wearables. |
| Security Features | 1×128-byte factory UID + 3×128-byte OTP registers - enables secure device identity binding and immutable key storage for TLS certificate provisioning. |
Pinout & Package
AT25FF321A-DWF is supplied as bare die in wafer form, intended for direct integration into custom packages or chip-on-board assemblies. No leadframe or molded package is provided; bonding pads correspond to standard 8-pin SPI flash pin functions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must transition high-to-low before command initiation and low-to-high after completion; requires external 10 kΩ pull-up to VCC for reliable power-up sequencing. |
| SCK | Serial Clock | Input clock driving all SPI transfers; data latched on rising edge (SI), output shifted on falling edge (SO/I/Ox); supports up to 133 MHz in quad I/O mode. |
| SI (I/O0) | Serial Input / Quad I/O Lane 0 | Primary command/address/data input; reconfigures as bidirectional I/O0 during dual/quad operations for parallel data transfer. |
| SO (I/O1) | Serial Output / Quad I/O Lane 1 | Default output for standard reads; becomes I/O1 in multi-I/O modes to support simultaneous 2- or 4-bit data streaming. |
| WP (I/O2) | Write Protect / Quad I/O Lane 2 | Hardware write protection when asserted low; doubles as I/O2 in quad I/O mode for full 4-lane bidirectional communication. |
| HOLD/RESET (I/O3) | Hold or Hardware Reset | Pauses ongoing transfers when held low; also serves as JEDEC-compliant hardware reset input; functions as I/O3 in quad I/O mode. |
Key Features
| Feature | Design Value |
|---|---|
| eXecute-in-Place (XiP) support | Enables direct code execution from flash via 0-4-4 command format, eliminating RAM copy overhead and reducing boot latency by >40% in MCU-based systems. |
| Quad I/O (1-4-4, 0-4-4) | Doubles bandwidth vs. standard SPI by using all four I/O pins for address and data, achieving 66.5 MB/s read rate at 133 MHz without requiring additional bus lines. |
| Program/Erase Suspend & Resume | Allows host to pause active erase/program operations to service urgent reads, then resume - critical for real-time firmware update scenarios with guaranteed response deadlines. |
| User-configurable I/O drive strength | Permits tuning of output slew rate and current to match PCB trace impedance and reduce EMI in high-speed layouts, avoiding signal integrity issues at 133 MHz. |
| Serial Flash Discoverable Parameters (SFDP) | Provides standardized, vendor-agnostic access to device capabilities (timing, erase sizes, protection schemes) via 5Ah command - simplifies bootloader portability across flash vendors. |
Applications
| Industrial PLC Firmware Storage | Medical Wearable Data Logger |
|---|---|
Use Scenario: Storing firmware updates and calibration tables in programmable logic controllers operating in harsh environments with wide temperature swings. IC Role / Device Role / Timing Role: Non-volatile program memory with XiP capability and 20-year data retention, enabling field-upgradable logic without external RAM buffering. Use Value: Eliminates need for separate NOR flash + RAM combo; 100,000-cycle endurance supports decades of over-the-air updates in unattended installations. | Use Scenario: Capturing sensor readings (ECG, SpO₂) in ultra-low-power wearable patches powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-leakage data buffer with 5–7 nA ultra-deep power-down, activated only during scheduled measurement bursts. Use Value: Extends battery life beyond 3 years by minimizing quiescent current during 99.9% of operational time while retaining full firmware integrity. |
| Automotive Telematics Boot Memory | Smart Home Gateway Configuration Store |
Use Scenario: Secure boot image storage for LTE/V2X gateways requiring AEC-Q100-compliant components and cryptographic key isolation. IC Role / Device Role / Timing Role: Trusted execution environment anchor with 1×128-byte factory UID and 3×128-byte OTP registers for asymmetric key generation and attestation. Use Value: Prevents firmware cloning and unauthorized reprogramming via hardware-enforced write-protection and one-time programmable identity binding. | Use Scenario: Holding Wi-Fi credentials, Zigbee mesh keys, and OTA update manifests in residential smart hubs with frequent connectivity changes. IC Role / Device Role / Timing Role: Secure, field-updatable configuration repository leveraging individual block protection (36h/39h) to isolate sensitive parameters from application code. Use Value: Enables zero-touch provisioning and remote credential rotation without risking corruption of core firmware partitions during wireless updates. |
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-DTR | 32-Mbit, 1.7–2.0 V / 2.7–3.6 V dual supply; supports octal DTR mode up to 200 MHz; no ultra-deep power-down (min 0.5 µA). | Better suited for high-throughput applications needing >100 MB/s burst reads; lacks sub-10 nA power states for multi-year battery use. | Select W25Q32JW-DTR when system clock budget permits higher VCC and bandwidth outweighs ultra-low-power requirements. |
| Macronix MX25L3233F | 32-Mbit, 2.7–3.6 V only; supports 133 MHz quad I/O but no XiP continuous read (0-4-4); 10 µA deep power-down (vs. 5–7 nA). | Compatible for standard firmware storage where execute-in-place is not required; less suitable for battery-critical XiP implementations. | Choose MX25L3233F for cost-sensitive industrial designs where voltage range and ultra-low-power modes are secondary to basic quad-SPI compatibility. |
Compared with W25Q32JW-DTR and MX25L3233F, the AT25FF321A-DWF uniquely combines ultra-deep power-down (5–7 nA), true XiP continuous read (0-4-4), and single-supply 1.65–3.6 V operation - making it optimal for energy-harvested and coin-cell-powered edge devices requiring both performance and longevity.
Availability
AT25FF321A-DWF is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical wearable data logging, and automotive telematics boot memory requiring stable component supply across extended product lifecycles.
Supply support for AT25FF321A-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 AT25FF321A belongs to Renesas' high-performance serial flash memory product line, engineered specifically for ultra-low-power, XiP-capable embedded systems demanding robust security, wide voltage operation, and wafer-level integration flexibility.
FAQ
What is the operating voltage range supported by the AT25FF321A-DWF?
The AT25FF321A-DWF operates across a single supply voltage range of 1.65 V to 3.6 V. This wide range enables direct compatibility with both 1.8 V and 3.3 V host systems, eliminates level-shifting requirements in mixed-voltage designs, and supports battery-powered applications where supply voltage may sag below 2.0 V during discharge - a capability confirmed in Section 7.2 of the official datasheet.
Does the AT25FF321A-DWF support execute-in-place (XiP) functionality?
Yes, the AT25FF321A-DWF fully supports eXecute-in-Place (XiP) via its 0-4-4 command format, which removes opcode transmission overhead and enables continuous high-speed instruction fetch directly from flash. This feature is explicitly documented in the Product Overview (Page 6) and XiP Mode Operation section (Page 18), allowing MCUs to eliminate boot-time RAM copying and reduce startup latency by up to 40%.
How many one-time programmable (OTP) security registers does the AT25FF321A-DWF provide?
The AT25FF321A-DWF provides three 128-byte One Time Programmable (OTP) security registers, in addition to a factory-programmed 128-byte unique identifier. These OTP registers are used for storing cryptographic keys, device certificates, or immutable configuration data, and their programming and locking behavior is defined in Sections 4.11 and 6.22 of the datasheet.
What are the lowest power consumption modes available on the AT25FF321A-DWF?
The AT25FF321A-DWF offers two ultra-low-power states: Deep Power-Down (B9h) with typical current draw of 7 µA, and Ultra-Deep Power-Down (79h) consuming just 5–7 nA. Both modes retain full memory content and are exited via ABh command with device ID verification, as specified in Tables 5–6 and Section 4.9 of the datasheet.
Is the AT25FF321A-DWF supplied in a packaged form or as bare die?
The AT25FF321A-DWF is supplied exclusively as die-in-wafer form (DWF), with no molded package or leadframe. It is intended for custom assembly onto substrates or interposers, and its bonding pad layout corresponds to the standard 8-pin SPI flash pinout shown in Figure 2 and Table 1 of the datasheet - making it suitable for chip-scale integration in space-constrained modules.
AT25FF321A-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:
- 133 MHz
- Write Cycle Time - Word, Page:
- 32µs, 10.5ms
- Access Time:
- 8 ns
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Wafer
AT25FF321A-DWF FAQ
1.How can I place an order for AT25FF321A-DWF through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25FF321A-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 AT25FF321A-DWF reliable?
The price and inventory of AT25FF321A-DWF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25FF321A-DWF is usually 5 days.
3.What payment methods are accepted for AT25FF321A-DWF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25FF321A-DWF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25FF321A-DWF?
AT25FF321A-DWF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25FF321A-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 AT25FF321A-DWF?
For technical support, including AT25FF321A-DWF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25FF321A-DWF requirements.
6.How does Aetrix verify that AT25FF321A-DWF is sourced from the original manufacturer or authorized distributors?
All AT25FF321A-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 AT25FF321A-DWF meets industry standards.
7.What is the process for return or replacement of AT25FF321A-DWF?
All AT25FF321A-DWF units undergo pre-shipment inspection (PSI). If there is an issue with AT25FF321A-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 AT25FF321A-DWF part is unused and in its original packaging.
Return procedure for AT25FF321A-DWF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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