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Renesas AT25FF321A-MBUN-T
- Part No.:
- AT25FF321A-MBUN-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-UDFN Exposed Pad
- Datasheet:
-
AT25FF321A-MBUN-T.pdf
- Description:
- IC FLASH 32MBIT SPI/QUAD 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,152
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Product details
Overview
AT25FF321A-MBUN-T from Renesas Electronics is a 32-Mbit serial Flash memory IC optimized for low-power, code-execution-in-place (XiP) and data storage applications in battery-powered embedded systems. It operates across 1.65 V–3.6 V, supports SPI modes 0/3, delivers 133 MHz max clock frequency, achieves 8 ns clock-to-output timing, and features uniform 4-kB/32-kB/64-kB block erase plus full-chip erase - enabling efficient firmware updates and parameter logging in IoT edge nodes.
For engineers reviewing the AT25FF321A-MBUN-T datasheet, AT25FF321A-MBUN-T pinout, AT25FF321A-MBUN-T application, or AT25FF321A-MBUN-T equivalent, this page provides verified technical context, validated pin functions, real-world use cases in constrained power environments, and confirmed alternative parts with documented functional alignment and package compatibility.
Technical Context
The AT25FF321A-MBUN-T implements a Multi-I/O architecture supporting standard SPI (1-1-1), dual output (1-1-2), quad output (1-1-4), quad I/O (1-4-4), and XiP (0-4-4/1-4-4) transfer modes - all managed by configurable status registers and hardware-controlled HOLD/RESET functionality. Its internal 256-byte SRAM buffer enables high-throughput page programming and suspend/resume operations during active erase or program cycles.
Memory organization comprises 2-Mbit physical blocks with flexible non-volatile protection using individual and global block lock commands, OTP security registers (3 × 128-byte), and JEDEC-compliant SFDP v1.6 for automatic configuration discovery. Power management includes Deep Power-Down (7 µA typ.) and Ultra-Deep Power-Down (5–7 nA typ.) states, triggered via dedicated commands and hardware reset support.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (4 MB) - sufficient for boot code, firmware images, and persistent configuration storage in resource-constrained microcontrollers. |
| Supply Voltage Range | 1.65 V to 3.6 V - compatible with single-cell Li-ion, Li-polymer, and regulated 3.3 V/2.5 V rails without level-shifting. |
| Max Clock Frequency | 133 MHz (1-1-1 mode) - enables fast read throughput up to ~16.6 MB/s, critical for XiP latency-sensitive applications. |
| Access Time | 8 ns clock-to-output - ensures deterministic timing for real-time instruction fetch in XiP configurations. |
| Erase Granularity | Uniform 4-kB / 32-kB / 64-kB blocks + full chip - allows fine-grained firmware patching and coarse bulk reprogramming without over-erasing. |
| Endurance & Retention | 100,000 program/erase cycles and 20-year data retention - meets industrial-grade reliability requirements for field-deployed devices. |
| Power Consumption | 7 µA Deep Power-Down (typ.), 5–7 nA Ultra-Deep Power-Down (typ.) - extends battery life in always-on sensor nodes and wearables. |
Pinout & Package
AT25FF321A-MBUN-T is packaged in an 8-pin Ultra-thin Small Outline No-lead (USON) package measuring 3 mm × 4 mm × 0.55 mm, RoHS-compliant and halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must transition high-to-low to initiate any command sequence and low-to-high to terminate - controls device selection and standby entry timing. |
| SCK | Serial Clock | Input clock driving all SPI transfers; rising edge latches SI data, falling edge clocks SO data - defines maximum interface speed and timing margins. |
| SI (I/O0) | Serial Input / Quad I/O Lane 0 | Primary command/address/data input; becomes bidirectional I/O0 in multi-I/O modes - enables 1-, 2-, or 4-bit parallel data transfer depending on selected protocol. |
| SO (I/O1) | Serial Output / Quad I/O Lane 1 | Primary read-data output; serves as I/O1 in dual/quad modes - doubles or quadruples read bandwidth versus standard SPI. |
| WP (I/O2) | Write Protect / Quad I/O Lane 2 | Hardware write-protection when held low; repurposed as I/O2 in quad I/O/XiP modes - enables secure firmware locking and expanded I/O capability. |
| HOLD/RESET (I/O3) | Hold Function / Hardware Reset / Quad I/O Lane 3 | Pauses ongoing transfers without deselecting CS; also triggers JEDEC hardware reset; acts as I/O3 in quad modes - supports robust system recovery and high-speed burst reads. |
| VCC | Power Supply | 1.65 V–3.6 V core supply; requires local decoupling per datasheet guidelines to maintain stable operation during high-current program/erase pulses. |
| GND | Ground Reference | Return path for all digital and analog circuitry; must be low-impedance and co-located with VCC decoupling to minimize noise coupling into sensitive I/O paths. |
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 (quad I/O & XiP) - adapts interface speed to host controller capability and application latency needs. |
| Flexible Erase Architecture | Four independent erase granularities (4/32/64 kB + full chip) - minimizes flash wear and improves update efficiency for mixed code/data partitions. |
| OTP Security Registers | Three 128-byte One-Time Programmable registers plus one factory-programmed 128-byte UID - supports secure key injection, device binding, and anti-cloning in certified firmware deployments. |
| Ultra-Low Power States | Deep Power-Down (7 µA) and Ultra-Deep Power-Down (5–7 nA) with fast wake-up - essential for energy harvesting and multi-year battery life in remote sensors. |
| Program/Erase Suspend | Allows interrupting long erase/program operations to service urgent reads - maintains system responsiveness without sacrificing flash endurance or data integrity. |
Applications
| IoT Edge Node Firmware Storage | Wearable Device Configuration Memory |
|---|---|
|
Use Scenario: Storing and updating BLE stack firmware and sensor calibration parameters in compact, battery-powered wearables. IC Role / Device Role / Timing Role: Non-volatile code and data storage with XiP support and ultra-low deep-sleep current. Use Value: Enables over-the-air firmware upgrades without external RAM shadowing, while extending coin-cell battery life beyond 2 years via 5–7 nA UDPD current. |
Use Scenario: Holding user profile settings, health metrics history, and display assets in fitness trackers with tight PCB area constraints. IC Role / Device Role / Timing Role: High-density, low-voltage serial Flash with 3×128-byte OTP for secure credential storage. Use Value: Reduces BOM count by eliminating separate EEPROM/secure element; 3 mm × 4 mm USON footprint fits under curved displays or flex PCBs. |
| Industrial PLC Boot Memory | Smart Home Hub Code Execution |
|
Use Scenario: Hosting bootloader and real-time control logic in DIN-rail mounted programmable logic controllers operating across -40°C to +85°C. IC Role / Device Role / Timing Role: Reliable, temperature-rated Flash with 100K-cycle endurance and hardware reset integration. Use Value: Eliminates need for external reset supervisors; JEDEC hardware reset and HOLD/RESET pin ensure deterministic recovery after brownouts or ESD events. |
Use Scenario: Executing Linux kernel modules and Zigbee/Z-Wave protocol stacks directly from Flash in always-on home automation hubs. IC Role / Device Role / Timing Role: XiP-capable serial Flash with 133 MHz max clock and 8 ns access time for low-latency instruction fetch. Use Value: Reduces external DRAM requirement by 32 MB; quad I/O mode delivers >50 MB/s effective read bandwidth for concurrent wireless stack execution. |
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-SN | 32-Mbit, 1.7–2.0 V / 2.7–3.6 V dual supply range; supports DTR mode; 133 MHz max; same 8-pin USON (3×4 mm) package. | Lacks OTP security registers and XiP-specific command set (EBh/E7h); uses different SFDP layout. | Preferred where dual-voltage flexibility and DTR timing are required, but security and XiP optimization are secondary. |
| Micron MT25QL32ABA8ESF-0SIT | 32-Mbit, 2.7–3.6 V only; 133 MHz max; supports 1-4-4/XiP; includes 128-byte UID; same 8-pin USON (3×4 mm) footprint. | No OTP registers; deeper power-down current is 2.5 µA (vs. 5–7 nA); lacks program/erase suspend capability. | Selected when JEDEC JESD216-compliant SFDP and broad ecosystem tooling are prioritized over ultra-low-power sleep states. |
Compared with Winbond W25Q32JW-SN and Micron MT25QL32ABA8ESF-0SIT, the AT25FF321A-MBUN-T uniquely combines sub-nA deep-sleep current, integrated OTP security, and full XiP command support - making it optimal for battery-critical, secure, and latency-sensitive embedded designs where power budget and firmware integrity are primary constraints.
Availability
AT25FF321A-MBUN-T is available at Aetrix Electronics and suitable for IoT edge node firmware storage, wearable device configuration memory, and industrial PLC boot memory requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AT25FF321A-MBUN-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 connectivity solutions for automotive, industrial, infrastructure, and IoT applications.
The AT25FF321A belongs to Renesas' serial Flash memory product line, engineered specifically for ultra-low-power, secure, and XiP-capable embedded systems where voltage flexibility, endurance, and compact packaging are critical design requirements.
FAQ
What is the operating voltage range of the AT25FF321A-MBUN-T?
The AT25FF321A-MBUN-T operates across a wide supply range of 1.65 V to 3.6 V, enabling direct compatibility with single-cell lithium batteries and common 3.3 V or 2.5 V system rails. This eliminates the need for external voltage translators in portable and energy-harvesting designs, and the device maintains full functionality-including 133 MHz operation and XiP support-across the entire voltage range as specified in the official Renesas datasheet DS-AT25FF321A-181.
Does the AT25FF321A-MBUN-T support execute-in-place (XiP) operation?
Yes, the AT25FF321A-MBUN-T fully supports XiP operation using 1-4-4 and 0-4-4 transfer modes (commands EBh and E7h), allowing microcontrollers to fetch instructions directly from Flash without shadowing to RAM. Its 8 ns clock-to-output timing and quad I/O architecture ensure low-latency, high-bandwidth instruction reads - a key enabler for memory-constrained MCUs in real-time embedded applications.
What package type is used for the AT25FF321A-MBUN-T?
The AT25FF321A-MBUN-T uses an 8-pad Ultra-thin Small Outline No-lead (USON) package measuring 3 mm × 4 mm × 0.55 mm. This RoHS-compliant, halogen-free package offers superior thermal performance and board space savings compared to SOIC variants, and is pin-compatible with other USON-based serial Flash devices in the same footprint family.
How many One-Time Programmable (OTP) security registers does the AT25FF321A-MBUN-T include?
The AT25FF321A-MBUN-T includes three user-programmable 128-byte OTP security registers plus one factory-programmed 128-byte unique identifier register. These registers support secure key storage, device authentication, and firmware binding - and once locked via the OTP Security Register Lock command (98h), their contents cannot be altered, providing tamper-resistant identity and credential management.
What are the lowest power consumption states supported by the AT25FF321A-MBUN-T?
The AT25FF321A-MBUN-T supports two ultra-low-power states: Deep Power-Down (DPD) with 7 µA typical current draw, and Ultra-Deep Power-Down (UDPD) with just 5–7 nA typical current. Both states are entered via dedicated commands (B9h and 79h) and exited with ABh, enabling multi-year battery life in always-on sensor nodes and intermittent wake-up applications.
AT25FF321A-MBUN-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-UDFN Exposed Pad
- 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:
- -
- Access Time:
- -
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-USON (4x3)
AT25FF321A-MBUN-T FAQ
1.How can I place an order for AT25FF321A-MBUN-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25FF321A-MBUN-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-MBUN-T reliable?
The price and inventory of AT25FF321A-MBUN-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-MBUN-T is usually 5 days.
3.What payment methods are accepted for AT25FF321A-MBUN-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25FF321A-MBUN-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25FF321A-MBUN-T?
AT25FF321A-MBUN-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25FF321A-MBUN-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-MBUN-T?
For technical support, including AT25FF321A-MBUN-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25FF321A-MBUN-T requirements.
6.How does Aetrix verify that AT25FF321A-MBUN-T is sourced from the original manufacturer or authorized distributors?
All AT25FF321A-MBUN-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-MBUN-T meets industry standards.
7.What is the process for return or replacement of AT25FF321A-MBUN-T?
All AT25FF321A-MBUN-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25FF321A-MBUN-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-MBUN-T part is unused and in its original packaging.
Return procedure for AT25FF321A-MBUN-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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