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Renesas AT25FF321A-UUN-T
- Part No.:
- AT25FF321A-UUN-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 12-XFBGA, WLCSP
- Datasheet:
-
AT25FF321A-UUN-T.pdf
- Description:
- IC FLASH 32MBIT SPI/QUAD 12WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,708
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Product details
Overview
AT25FF321A-UUN-T from Renesas Electronics is a 32-Mbit serial Flash memory IC designed for embedded code storage and data logging in low-power, battery-operated systems. It operates across 1.65 V–3.6 V, supports SPI modes 0/3, delivers up to 133 MHz clock frequency with 8 ns clock-to-output, and enables XiP (execute-in-place) operation via 1-4-4 and 0-4-4 quad I/O protocols.
For engineers reviewing the AT25FF321A-UUN-T datasheet, AT25FF321A-UUN-T pinout, AT25FF321A-UUN-T application, or AT25FF321A-UUN-T equivalent, key selection criteria include multi-I/O read bandwidth, ultra-low deep power-down current (5–7 nA), flexible block erase granularity (4/32/64 kB), OTP security register support, and JEDEC-compliant SFDP v1.6 parameter discovery.
Technical Context
The AT25FF321A-UUN-T implements a serial Flash architecture with a 256-byte SRAM buffer and configurable I/O Interface Unit supporting standard SPI (1-1-1), dual output (1-1-2), quad output (1-1-4), quad I/O (1-4-4), and XiP (0-4-4) transfer modes. Its interface control logic decodes command/address/data sequences on SI/SO/WP/HOLD pins under CS assertion and SCK timing.
Memory organization comprises uniform 4-kB, 32-kB, and 64-kB erase blocks plus full-chip erase, enabling efficient partitioning of code and data regions. Protection is enforced via non-volatile status register bits and individual/global block lock commands (36h/7Eh), while security relies on four 128-byte OTP registers-three user-programmable and one factory-programmed unique ID.
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. |
| Supply Voltage Range | 1.65 V – 3.6 V; compatible with single-cell Li-ion, Li-polymer, and 3.3 V/2.5 V system rails without level-shifting. |
| Max Clock Frequency | 133 MHz (1-4-4 mode); enables high-throughput XiP execution and rapid firmware updates over quad I/O. |
| Read Latency | 8 ns clock-to-output (tCHQV); minimizes instruction fetch stalls during XiP operation at maximum speed. |
| Erase Granularity | Uniform 4-kB / 32-kB / 64-kB blocks + full chip; allows precise code patching and wear-leveling-aware data logging. |
| Power Consumption | 5–7 nA Ultra-Deep Power-Down (UDPD); extends battery life in always-on IoT edge nodes between wake cycles. |
| Data Retention | 20 years at +85 °C; ensures long-term reliability for industrial and automotive telematics storage. |
| Endurance | 100,000 program/erase cycles per block; supports frequent OTA update deployments in connected devices. |
Pinout & Package
AT25FF321A-UUN-T is packaged in an 8-pad Ultra-thin Small Outline No-lead (USON) package measuring 3 mm × 4 mm × 0.55 mm - optimized for space-constrained portable and wearable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must transition high→low to initiate any command sequence and low→high to terminate. |
| SCK | Serial Clock | Input clock driving all data transfers; rising edge latches SI, falling edge clocks SO/I/Ox outputs. |
| SI (I/O0) | Serial Input / Quad I/O Lane 0 | Primary command/address/data input; becomes bidirectional I/O0 during dual/quad/XiP reads. |
| SO (I/O1) | Serial Output / Quad I/O Lane 1 | Standard output for 1-1-1 reads; functions as I/O1 in multi-I/O modes for parallel data streaming. |
| WP (I/O2) | Write Protect / Quad I/O Lane 2 | Hardware write protection when asserted low; serves as I/O2 in quad I/O operations. |
| HOLD/RESET (I/O3) | Hold Function / Hardware Reset / Quad I/O Lane 3 | Pauses ongoing transfers when held low; triggers hardware reset when pulsed; acts as I/O3 in quad modes. |
| VCC | Power Supply | 1.65–3.6 V core supply; powers internal logic, memory array, and I/O drivers. |
| GND | Ground | Reference return path for VCC and all I/O signals; critical for noise immunity in high-speed SPI. |
Key Features
| Feature | Design Value |
|---|---|
| Multi-I/O Protocol Support | Enables scalable bandwidth: 1-1-1 (standard SPI), 1-1-2 (dual), 1-1-4 (quad output), 1-4-4/0-4-4 (full quad I/O and XiP) - no external bus widening needed. |
| Flexible Erase Architecture | Four uniform erase block sizes (4/32/64 kB + full chip) allow optimal allocation of code vs. configuration vs. log data without wasted space. |
| OTP Security Registers | Three 128-byte One-Time Programmable registers + one factory-programmed 128-byte UID enable secure key injection, device binding, and anti-cloning. |
| Ultra-Low Power Modes | Deep Power-Down (7 µA typ.) and Ultra-Deep Power-Down (5–7 nA typ.) reduce quiescent consumption by >99.9% versus active read mode. |
| SFDP v1.6 Compliance | Allows automatic runtime discovery of device parameters (timing, density, erase sizes) without hard-coded driver assumptions. |
| JEDEC Standard IDs | Supports read of Manufacturer ID (90h), Device ID (90h/94h), and JEDEC ID (9Fh) - simplifies generic flash driver integration. |
Applications
| IoT Edge Node Firmware Storage | Wearable Health Monitor Data Logging |
|---|---|
|
Use Scenario: Storing boot firmware and OTA update payloads in battery-powered environmental sensors deployed for years without maintenance. IC Role / Device Role / Timing Role: Non-volatile code storage with XiP capability and ultra-low UDPD current to minimize energy per wake cycle. Use Value: 5–7 nA UDPD current extends 200 mAh coin-cell lifetime beyond 10 years; 133 MHz quad I/O enables sub-second firmware validation post-wake. |
Use Scenario: Capturing sensor-acquired ECG/PPG waveforms and metadata in compact hearables with strict size and thermal constraints. IC Role / Device Role / Timing Role: Local data buffer with 4-kB erase granularity for wear-leveling-aware circular logging and fast timestamped retrieval. Use Value: Uniform 4-kB blocks align with typical sensor packet sizes; 100K endurance supports daily multi-gigabyte logging over 5+ years. |
| Industrial PLC Configuration Memory | Automotive ADAS Boot Image Storage |
|
Use Scenario: Holding field-configurable I/O mapping, calibration tables, and safety-critical parameters in programmable logic controllers operating at -40 °C to +85 °C. IC Role / Device Role / Timing Role: Secure, temperature-stable non-volatile storage with hardware write protection (WP pin) and global block lock (7Eh command). Use Value: Factory-programmed UID and OTP registers prevent unauthorized configuration cloning; 20-year retention ensures data integrity across equipment lifecycle. |
Use Scenario: Storing certified boot firmware and sensor fusion algorithms for camera/radar processing units requiring ASIL-B compliance. IC Role / Device Role / Timing Role: High-reliability code storage with dual/quad read acceleration and robust power-up sequencing (CS pull-up recommended). Use Value: 8 ns tCHQV latency reduces boot time by ~12% vs. legacy 25 ns parts; SFDP v1.6 enables automated driver compatibility verification. |
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, 1.7–2.0 V / 2.7–3.6 V dual supply range; supports DTR mode; lacks 0-4-4 XiP and SFDP v1.6. | Requires separate VCC/VIO rails for low-voltage operation; no native execute-in-place capability for direct code execution. | Prefer AT25FF321A-UUN-T when single-supply 1.65–3.6 V operation, XiP, or SFDP-based auto-configuration is required. |
| Micron MT25QL32ABA | 32 Mbit, 2.7–3.6 V only; supports 133 MHz quad I/O but no UDPD mode (<1 µA DPD only); includes octal DTR extension. | Not suitable for sub-2.7 V battery systems; higher standby current limits use in always-on edge nodes. | Choose AT25FF321A-UUN-T for ultra-low-power designs needing <7 nA UDPD or wide 1.65–3.6 V compatibility. |
Compared with W25Q32JW and MT25QL32ABA, the AT25FF321A-UUN-T uniquely combines single-supply 1.65–3.6 V operation, 0-4-4 XiP, SFDP v1.6, and 5–7 nA UDPD - making it optimal for compact, battery-driven embedded systems requiring both performance and longevity.
Availability
AT25FF321A-UUN-T is available at Aetrix Electronics and suitable for IoT edge node firmware storage, wearable health monitor data logging, and industrial PLC configuration memory requiring stable component supply across extended product lifecycles.
Supply support for AT25FF321A-UUN-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, infrastructure, and IoT markets.
The AT25FF321A belongs to Renesas' serial Flash memory product line, engineered specifically for ultra-low-power, multi-I/O-capable embedded storage in battery-constrained and thermally sensitive applications.
FAQ
What voltage range does the AT25FF321A-UUN-T support, and why is this important for portable designs?
The AT25FF321A-UUN-T operates from 1.65 V to 3.6 V, enabling direct interfacing with single-cell lithium batteries (nominal 3.7 V, discharge down to ~2.5 V) and 3.3 V/2.5 V system rails without voltage translation. This eliminates level-shifters, reduces BOM count, and improves power efficiency - critical for wearables, remote sensors, and other space- and energy-constrained portable electronics where the AT25FF321A-UUN-T is commonly deployed.
Does the AT25FF321A-UUN-T support execute-in-place (XiP), and what interface modes enable it?
Yes, the AT25FF321A-UUN-T supports XiP operation using 1-4-4 (command + 4-bit address + 4-bit data) and 0-4-4 (no command byte, 4-bit address + 4-bit data) quad I/O protocols. These modes allow microcontrollers to fetch instructions directly from Flash without copying to RAM, reducing boot latency and SRAM usage. The AT25FF321A-UUN-T's 8 ns clock-to-output and 133 MHz max frequency ensure minimal instruction stall cycles during XiP execution.
How many and what types of erase block sizes does the AT25FF321A-UUN-T provide?
The AT25FF321A-UUN-T offers four uniform erase block sizes: 4 kB, 32 kB, 64 kB, and full-chip. This granularity enables efficient partitioning - small 4 kB blocks suit configuration storage and firmware patches, while larger blocks optimize bulk data logging or image updates. All erase operations are internally self-timed and do not require external high-voltage programming pulses, simplifying system design around the AT25FF321A-UUN-T.
What security features are integrated into the AT25FF321A-UUN-T?
The AT25FF321A-UUN-T includes one factory-programmed 128-byte unique identifier and three user-programmable 128-byte One-Time Programmable (OTP) security registers. These support secure key injection, device authentication, and tamper-resistant firmware binding. OTP registers can be permanently locked via command 9Bh, preventing reprogramming - a critical feature for protecting intellectual property and ensuring supply chain integrity in designs using the AT25FF321A-UUN-T.
What is the lowest power-consumption state supported by the AT25FF321A-UUN-T, and how is it entered?
The AT25FF321A-UUN-T supports Ultra-Deep Power-Down (UDPD) mode with typical current draw of 5–7 nA. It is entered via the 79h command after issuing Write Enable (06h). In UDPD, all internal circuitry is disabled except for the wake-up detection logic on CS and HOLD/RESET pins. This state is ideal for long-duration sleep in battery-powered systems, and the AT25FF321A-UUN-T resumes normal operation within microseconds upon CS assertion.
AT25FF321A-UUN-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 12-XFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH - NOR
- Memory Size:
- 32Mbit
- Memory Organization:
- 4M x 8
- Memory Interface:
- SPI - Quad I/O
- Clock Frequency:
- 104 MHz
- Write Cycle Time - Word, Page:
- 22µs, 8ms
- Access Time:
- -
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-WLCSP (2.39x1.77)
AT25FF321A-UUN-T FAQ
1.How can I place an order for AT25FF321A-UUN-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25FF321A-UUN-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 AT25FF321A-UUN-T reliable?
The price and inventory of AT25FF321A-UUN-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25FF321A-UUN-T is usually 5 days.
3.What payment methods are accepted for AT25FF321A-UUN-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25FF321A-UUN-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25FF321A-UUN-T?
AT25FF321A-UUN-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25FF321A-UUN-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 AT25FF321A-UUN-T?
For technical support, including AT25FF321A-UUN-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25FF321A-UUN-T requirements.
6.How does Aetrix verify that AT25FF321A-UUN-T is sourced from the original manufacturer or authorized distributors?
All AT25FF321A-UUN-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 AT25FF321A-UUN-T meets industry standards.
7.What is the process for return or replacement of AT25FF321A-UUN-T?
All AT25FF321A-UUN-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25FF321A-UUN-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 AT25FF321A-UUN-T part is unused and in its original packaging.
Return procedure for AT25FF321A-UUN-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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