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Renesas AT25FF321A-SHN-T
- Part No.:
- AT25FF321A-SHN-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25FF321A-SHN-T.pdf
- Description:
- IC FLASH 32MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,934
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Product details
Overview
AT25FF321A-SHN-T from Renesas Electronics is a 32-Mbit SPI serial flash memory IC supporting 1.65 V–3.6 V operation, quad I/O (1-4-4/XiP) and dual/quad output modes, with 133 MHz max clock frequency and 20-year data retention. It serves as non-volatile program storage or eXecute-in-Place (XiP) memory in embedded boot and firmware update systems.
For engineers reviewing the AT25FF321A-SHN-T datasheet, AT25FF321A-SHN-T pinout, AT25FF321A-SHN-T application, or AT25FF321A-SHN-T equivalent, key selection factors include multi-I/O read performance, ultra-low deep power-down current (5–7 nA), flexible block erase granularity (4/32/64 kByte), OTP security register support, and JEDEC SFDP compliance for automatic configuration.
Technical Context
The AT25FF321A-SHN-T implements a serial flash architecture with a 256-byte SRAM buffer and configurable I/O interface unit enabling 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 command set includes suspend/resume for nested program/erase operations and burst wrap control.
Memory protection is implemented via individual block lock, global lock/unlock, and user-definable protected areas at memory start/end. Status registers (SR1–SR5) provide volatile/non-volatile control over write enable, protection bits, drive strength, and reset behavior - all accessible via direct or indirect addressing per JEDEC SFDP.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (4 MB) organized as 65,536 × 64-bit pages; enables full firmware image storage for mid-complexity microcontrollers. |
| Operating Voltage | 1.65 V to 3.6 V - supports single-supply battery-powered designs (e.g., coin-cell or Li-ion) without level-shifting. |
| Max Clock Frequency | 133 MHz in quad I/O mode - delivers up to 532 MB/s effective read bandwidth for XiP latency-critical applications. |
| Erase Granularity | 4-kByte, 32-kByte, 64-kByte blocks + full chip erase - allows fine-grained firmware partitioning and OTA update management. |
| Power Consumption | 5–7 nA ultra-deep power-down current - extends shelf life and enables years of standby in energy-harvesting or remote sensor nodes. |
| Data Retention | 20 years at +85 °C - meets industrial-grade reliability requirements for unattended equipment and infrastructure systems. |
| Endurance | 100,000 program/erase cycles - supports frequent field firmware updates in connected devices and gateways. |
Pinout & Package
AT25FF321A-SHN-T is packaged in an 8-pad USON (3 mm × 4 mm × 0.55 mm) with wettable flanks, RoHS-compliant and halide-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must transition high-to-low to initiate commands and low-to-high to terminate operations - critical for bus arbitration in multi-device SPI systems. |
| SCK | Serial Clock | Master-generated clock; rising edge latches SI input, falling edge clocks SO output - timing governs maximum achievable throughput across all I/O modes. |
| SI (I/O0) | Serial Input / Quad I/O Lane 0 | Primary command/address/data input; reconfigures as bidirectional I/O0 during multi-I/O reads - enables 4-bit parallel data transfer in 1-4-4/XiP mode. |
| SO (I/O1) | Serial Output / Quad I/O Lane 1 | Standard output during 1-1-1 reads; becomes I/O1 in dual/quad modes - shares physical pin with I/O1 function per JEDEC JESD252B. |
| WP (I/O2) | Write Protect / Quad I/O Lane 2 | Hardware write protection when held low; functions as I/O2 in quad I/O mode - allows secure, pin-controlled memory lockdown independent of software status bits. |
| HOLD/RESET (I/O3) | Hold Input / Hardware Reset | Pauses ongoing transfers when asserted low; also serves as JEDEC-standard hardware reset - eliminates need for external reset IC in space-constrained designs. |
| VCC | Power Supply | 1.65–3.6 V supply input; internal voltage regulator ensures stable core operation across full range - simplifies power domain design. |
| GND | Ground | Reference return path for all I/O and core logic; requires low-impedance connection to minimize noise coupling into sensitive SPI signaling. |
Key Features
| Feature | Design Value |
|---|---|
| eXecute-in-Place (XiP) support | Enables direct code execution from flash via 0-4-4 command format and continuous read mode - eliminates RAM copy overhead and reduces boot time by >30% in Cortex-M applications. |
| Quad I/O (1-4-4) interface | Delivers 4-bit parallel data on I/O0–I/O3 during address and data phases - doubles bandwidth vs. standard quad output (1-1-4) and supports deterministic low-latency access. |
| Three 128-byte OTP security registers | Provide one-time programmable storage for cryptographic keys, device IDs, or calibration data - prevents runtime tampering and supports secure boot chain integrity. |
| Ultra-deep power-down (UDPD) | Reduces current to 5–7 nA while preserving memory contents - extends battery life to >10 years in always-on IoT endpoints with infrequent wake-up events. |
| JEDEC SFDP compliance | Allows host MCU to auto-detect memory geometry, timing parameters, and feature set via 5Ah command - eliminates hard-coded driver dependencies and enables firmware portability. |
Applications
| Firmware Storage for Industrial PLCs | Secure Boot in Medical Edge Devices |
|---|---|
|
Use Scenario: Storing firmware images and configuration data for 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 at +85 °C - serves as primary boot source and runtime code store. Use Value: Eliminates external RAM copy step during boot, reducing startup latency by 40 ms; 100K endurance supports quarterly firmware patches over 10+ year product lifecycle. |
Use Scenario: Securing boot firmware in FDA-cleared patient monitoring devices requiring cryptographic verification before execution. IC Role / Device Role / Timing Role: Trusted storage for public keys and signed bootloader images using three OTP security registers - enforces immutable root-of-trust. Use Value: Prevents unauthorized firmware modification; OTP locking ensures keys remain inaccessible after programming, meeting IEC 62304 Class C safety requirements. |
| OTA Update Memory in Smart Meters | Low-Power Sensor Node Code Storage |
|
Use Scenario: Hosting dual-bank firmware images for seamless over-the-air updates in ANSI C12.19-compliant electricity meters deployed in remote utility grids. IC Role / Device Role / Timing Role: Dual-block protected memory with 4-kByte erase granularity - isolates active and update partitions to guarantee atomic rollback on failure. Use Value: Enables field-upgradable firmware without service visits; individual block lock prevents corruption during partial writes under brown-out conditions. |
Use Scenario: Storing compact sensor fusion algorithms and calibration tables in battery-powered environmental sensors with 10-year deployment targets. IC Role / Device Role / Timing Role: Ultra-low-power serial flash with 5–7 nA UDPD current - retains firmware state between infrequent wake-ups powered by energy harvesting. Use Value: Extends usable battery life beyond 12 years at 1 wake-up/hour; 1.65 V minimum VCC ensures operation down to end-of-life battery voltage. |
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, 1.7–3.6 V, 133 MHz quad I/O, but lacks XiP continuous read mode and OTP security registers. | Supports basic firmware storage and OTA, but not certified secure boot or deterministic XiP latency. | Select when cost sensitivity outweighs XiP performance and cryptographic key storage needs. |
| Macronix MX25L3233F | 32-Mbit, 2.7–3.6 V only, 104 MHz max, no UDPD mode (<1 µA DPD), no SFDP v1.6 support. | Suitable for mains-powered applications with less stringent low-power or auto-configuration requirements. | Choose for legacy designs already using MX25L family; avoid in battery-operated or next-gen portable systems. |
Compared with Winbond W25Q32JW and Macronix MX25L3233F, the AT25FF321A-SHN-T uniquely combines ultra-low UDPD current, XiP-optimized 0-4-4 mode, and factory-programmed OTP registers - making it the only option among the three qualified for long-life, secure, and latency-sensitive embedded deployments.
Availability
AT25FF321A-SHN-T is available at Aetrix Electronics and suitable for industrial automation, medical edge computing, smart metering, and battery-powered IoT sensor applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AT25FF321A-SHN-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 trusted embedded solutions for automotive, industrial, infrastructure, and IoT markets, with deep expertise in flash memory and microcontroller integration.
The AT25FF321A belongs to Renesas' high-performance serial flash product line, engineered specifically for demanding embedded applications requiring XiP execution, ultra-low power states, and hardware-enforced security - not just generic code storage.
FAQ
What is the operating voltage range of the AT25FF321A-SHN-T?
The AT25FF321A-SHN-T operates from 1.65 V to 3.6 V, enabling direct interface with low-voltage MCUs and battery-powered systems without level shifters. This range supports single-cell lithium and coin-cell applications, and its internal regulation maintains stable timing across the full voltage window - a key differentiator versus narrower-range alternatives like the MX25L3233F.
Does the AT25FF321A-SHN-T support execute-in-place (XiP) operation?
Yes, the AT25FF321A-SHN-T fully supports XiP via its 0-4-4 command format and continuous read mode, eliminating dummy cycles and enabling deterministic instruction fetch latency. This capability is confirmed in the datasheet's Product Overview (Page 6) and XiP Mode Operation section (Page 18), and distinguishes it from standard quad-output-only flash devices such as the W25Q32JW.
How many OTP security registers does the AT25FF321A-SHN-T include?
The AT25FF321A-SHN-T includes three 128-byte One Time Programmable (OTP) security registers, documented in the Features list (Page 1) and Section 4.11 (Page 31). These registers are factory-programmable and lockable to store cryptographic keys, device identifiers, or calibration data - a feature absent in most competing 32-Mbit serial flash parts.
What is the ultra-deep power-down (UDPD) current specification for the AT25FF321A-SHN-T?
The AT25FF321A-SHN-T draws 5–7 nA in ultra-deep power-down mode (command 79h), as specified in the Features table (Page 1) and Electrical Specifications (Page 99). This ultra-low current enables decade-long battery life in infrequently awakened sensor nodes - significantly lower than the ~1 µA typical DPD current of the MX25L3233F.
Is the AT25FF321A-SHN-T compliant with JEDEC Serial Flash Discoverable Parameters (SFDP)?
Yes, the AT25FF321A-SHN-T implements JEDEC SFDP v1.6 (command 5Ah), allowing host processors to auto-read memory geometry, timing, and feature sets without hardcoded drivers. This is explicitly stated in the Features list (Page 1) and detailed in Section 6.37 (Page 96), ensuring firmware portability across platforms.
AT25FF321A-SHN-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- 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-SOIC
AT25FF321A-SHN-T FAQ
1.How can I place an order for AT25FF321A-SHN-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25FF321A-SHN-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-SHN-T reliable?
The price and inventory of AT25FF321A-SHN-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-SHN-T is usually 5 days.
3.What payment methods are accepted for AT25FF321A-SHN-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25FF321A-SHN-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25FF321A-SHN-T?
AT25FF321A-SHN-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25FF321A-SHN-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-SHN-T?
For technical support, including AT25FF321A-SHN-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25FF321A-SHN-T requirements.
6.How does Aetrix verify that AT25FF321A-SHN-T is sourced from the original manufacturer or authorized distributors?
All AT25FF321A-SHN-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-SHN-T meets industry standards.
7.What is the process for return or replacement of AT25FF321A-SHN-T?
All AT25FF321A-SHN-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25FF321A-SHN-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-SHN-T part is unused and in its original packaging.
Return procedure for AT25FF321A-SHN-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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