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Renesas AT25QL321-SHE-T
- Part No.:
- AT25QL321-SHE-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25QL321-SHE-T.pdf
- Description:
- IC FLASH 32MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,818
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Product details
Overview
AT25QL321 from Renesas Electronics is a 32-Mbit serial flash memory IC designed for code shadowing and data storage in embedded systems. It operates from a single 1.7 V–1.95 V supply, supports SPI/QPI/Dual/Quad I/O interfaces, delivers up to 104 MHz clock frequency, achieves 6 ns clock-to-output delay, and provides 65 MB/s continuous read throughput.
For engineers reviewing the AT25QL321 datasheet, AT25QL321 pinout, AT25QL321 application, or AT25QL321 equivalent, key selection criteria include quad I/O timing compliance, 4-/32-/64-kB flexible erase granularity, secured 4-kbit OTP register, deep power-down current (2 µA), and industrial temperature range (–40 °C to +85 °C).
Technical Context
The AT25QL321 implements a unified serial interface supporting standard SPI (modes 0/3), Dual I/O, Quad I/O, and QPI protocols - all configurable via status register bits and command set. Its memory array comprises 16,384 × 256-byte pages with physical block size of 8 Mbits, enabling granular 4-kB, 32-kB, 64-kB, and full-chip erase operations.
Hardware write protection is enforced through dedicated WP pin and SRP bits, while erase/program suspend/resume capability enables concurrent background operations. The device integrates Serial Flash Discoverable Parameters (SFDP) v1.6 support and JEDEC-standard manufacturer/device ID read methodology for automated configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (4 MB), organized as 16,384 pages × 256 bytes - enables efficient code/data partitioning without external memory expansion. |
| Supply Voltage | 1.7 V to 1.95 V - compatible with low-voltage SoC I/O domains and reduces system-level power regulation complexity. |
| Max Clock Frequency | 104 MHz (QPI mode) - delivers 532 MHz equivalent bandwidth via Quad I/O Fast Read, supporting high-speed boot and firmware update. |
| Read Throughput | 65 MB/s continuous - meets real-time firmware loading and OTA update latency requirements in edge devices. |
| Page Program Time | 0.6 ms typical (256 bytes) - enables rapid field firmware patching without extended downtime. |
| Erase Endurance | 100,000 cycles (4-/32-/64-kB blocks) - supports long-life logging and configuration storage in industrial controllers. |
| Data Retention | 20 years - ensures reliable operation across product lifecycle without refresh mechanisms. |
| Deep Power-Down Current | 2 µA typical - extends battery life in always-on IoT endpoints and portable medical sensors. |
Pinout & Package
AT25QL321 is offered in four industry-standard 8-pin packages: 8-pad UDFN (6 × 5 × 0.6 mm), 8-pad USON (3 × 4 × 0.55 mm), 8-lead SOIC (208-mil), and 8-ball WLCSP. All variants share identical pinout and electrical behavior.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must fall before any command; requires 10 kΩ pull-up to VCC for robust power-up sequencing. |
| SCK | Serial Clock | Input timing reference; data latched on rising edge, output shifted on falling edge - defines maximum interface speed. |
| SI (IO0) | Serial Input / Quad I/O Lane 0 | Primary command/address/data input path; functions as bidirectional I/O0 in Quad I/O and QPI modes. |
| SO (IO1) | Serial Output / Quad I/O Lane 1 | Default output lane; becomes bidirectional I/O1 in Dual/Quad I/O and QPI - enables parallel data transfer. |
| WP (IO2, ACC) | Write Protect / Acceleration Control | Hardware lock for protected sectors; doubles as 9 V ACC pin for accelerated programming when externally driven. |
| HOLD (IO3) | Hold Input / Quad I/O Lane 3 | Suspends ongoing serial transfer without deselecting device; serves as I/O3 in Quad I/O/QPI - preserves bus state during interrupts. |
| VCC | Power Supply | Single 1.7–1.95 V supply; powers core logic and I/O buffers - eliminates need for dual-rail voltage translation. |
| GND | Ground | Reference return path for all signals and power - critical for noise immunity in mixed-signal PCB layouts. |
Key Features
| Feature | Design Value |
|---|---|
| Quad I/O and QPI Support | Enables 4-bit-wide data transfers at 104 MHz, doubling bandwidth over standard SPI and eliminating bottlenecks in boot ROM access. |
| Flexible Erase Architecture | Supports 4-kB, 32-kB, 64-kB, and chip-erase - minimizes wasted space when updating modular firmware or logging datasets. |
| Secured 4-kbit OTP Register | Stores immutable keys, calibration data, or device IDs; accessible only after entering secured OTP mode - prevents cloning and tampering. |
| Erase/Program Suspend & Resume | Allows interrupt-driven foreground tasks (e.g., sensor sampling) to pause flash operations and resume without data loss or timeout errors. |
| SFDP v1.6 Compliance | Enables automatic driver initialization via standardized parameter table read (5Ah command), reducing BSP integration effort across MCU platforms. |
| Hardware Write Protection | Combines WP pin assertion and SRP[1:0] bits to lock sectors permanently or volatile - safeguards bootloader and security-critical regions. |
Applications
| Industrial PLC Firmware Storage | Automotive ADAS Boot Memory |
|---|---|
Use Scenario: Storing firmware images and configuration tables in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Non-volatile code storage with fast random-access read for shadowing into RAM during cold start and hot restart sequences. Use Value: 65 MB/s read throughput and 6 ns tV1 reduce boot time by >35% versus legacy 40 MHz SPI flash, improving machine uptime. | Use Scenario: Holding boot code and safety-critical firmware for radar/EPS ECUs operating under AEC-Q100 Grade 2 conditions. IC Role / Device Role / Timing Role: Primary boot memory interfaced to ARM Cortex-R5/R7 cores via QPI, meeting ASIL-B timing constraints. Use Value: Industrial temperature rating (–40 °C to +85 °C) and 100K-cycle endurance ensure reliability across 15-year vehicle lifecycles. |
| Medical Wearable Data Logger | Smart Home Gateway OTA Storage |
Use Scenario: Capturing sensor streams (ECG, SpO₂) in battery-powered wearable monitors requiring multi-week retention without recharge. IC Role / Device Role / Timing Role: Low-power data buffer with deep power-down (2 µA) between acquisition intervals and burst-programming capability. Use Value: 0.6 ms page program time and 2 µA deep power-down extend battery life to 12+ weeks on a single CR2032 cell. | Use Scenario: Storing signed firmware images and delta patches for secure over-the-air updates in residential Wi-Fi gateways. IC Role / Device Role / Timing Role: Secure storage for cryptographic keys (in 4-kbit OTP) and verified firmware binaries accessed during update validation. Use Value: Secured OTP prevents key extraction during physical attacks, while SFDP support simplifies bootloader compatibility across chipset generations. |
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, supports DTR mode up to 133 MHz; lacks ACC pin and secured OTP register. | Higher max clock but no hardware-accelerated programming or immutable key storage - less suitable for secure boot. | Select when maximum read bandwidth is prioritized over secure provisioning and accelerated field updates. |
| Micron MT25QL32ABB | 32 Mbit, 1.7–2.0 V, includes octal DTR support and HyperBus interface option; no ACC pin or 4-kbit OTP. | Offers wider interface flexibility (HyperBus) but no dedicated acceleration or tamper-proof storage - targets high-end networking gear. | Choose for systems requiring future upgrade path to octal interface or HyperBus compatibility, not for cost-sensitive secure-edge nodes. |
Compared with W25Q32JW and MT25QL32ABB, the AT25QL321 uniquely combines ACC-pin-accelerated programming, 4-kbit secured OTP, and industrial-grade endurance in a single 1.7–1.95 V supply - making it optimal for resource-constrained, security-aware embedded designs where firmware integrity and field update speed are critical.
Availability
AT25QL321 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive ADAS boot memory, and medical wearable data loggers requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AT25QL321 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 applications.
The AT25QL321 belongs to Renesas' AT25Q family of serial flash memories engineered for high-reliability embedded code and data storage - emphasizing low-voltage operation, flexible erase architecture, and integrated security features.
FAQ
What interface protocols does the AT25QL321 support?
The AT25QL321 supports standard SPI (modes 0 and 3), Dual I/O, Quad I/O, and QPI protocols. It uses the same physical pins for all modes, with protocol selection controlled via status register configuration and command opcodes (e.g., 38h to enable QPI). The AT25QL321 datasheet confirms full backward compatibility with legacy SPI hosts while enabling bandwidth scaling via Quad I/O and QPI commands.
Does the AT25QL321 include hardware-accelerated programming?
Yes, the AT25QL321 features an ACC (Acceleration) pin that accepts 9 V to reduce page program time. When driven externally to 9 V during programming, the internal charge pump is bypassed, cutting typical 256-byte page program time from 0.6 ms to sub-0.3 ms. This function is documented in Section 9.5 of the AT25QL321 datasheet and requires proper voltage isolation circuitry.
How is write protection implemented on the AT25QL321?
The AT25QL321 implements dual-layer write protection: hardware-based via the WP pin (active-low, tied to GND to lock sectors), and software-configurable via SRP1/SRP0 bits in Status Register-1. These bits control protection granularity (individual sectors, top/bottom halves, or full array) and volatility (volatile vs. permanent lock). Both mechanisms are detailed in Section 6.1 of the AT25QL321 datasheet.
What is the purpose of the 4-kbit secured OTP register in the AT25QL321?
The 4-kbit secured OTP (One-Time Programmable) register in the AT25QL321 stores immutable data such as cryptographic keys, device-specific identifiers, or calibration constants. Access requires issuing the Enter Secured OTP command (B1h); once programmed, bits cannot be altered. This feature is explicitly defined in Section 8.37 and Table 17 of the AT25QL321 datasheet and is used to prevent cloning and ensure firmware authenticity.
Is the AT25QL321 qualified for industrial temperature operation?
Yes, the AT25QL321 is specified for industrial temperature range: –40 °C to +85 °C. This rating applies across all supported packages (UDFN, USON, WLCSP, SOIC) and is guaranteed per the Absolute Maximum Ratings and Operating Ranges tables (Section 9.2) in the AT25QL321 datasheet. No derating is required within this range for read, program, or erase operations.
AT25QL321-SHE-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:
- -
- 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, QPI
- Clock Frequency:
- 104 MHz
- Write Cycle Time - Word, Page:
- 150µs, 5ms
- Access Time:
- 7 ns
- Voltage - Supply:
- 1.7V ~ 2V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25QL321-SHE-T FAQ
1.How can I place an order for AT25QL321-SHE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25QL321-SHE-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 AT25QL321-SHE-T reliable?
The price and inventory of AT25QL321-SHE-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25QL321-SHE-T is usually 5 days.
3.What payment methods are accepted for AT25QL321-SHE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25QL321-SHE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25QL321-SHE-T?
AT25QL321-SHE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25QL321-SHE-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 AT25QL321-SHE-T?
For technical support, including AT25QL321-SHE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25QL321-SHE-T requirements.
6.How does Aetrix verify that AT25QL321-SHE-T is sourced from the original manufacturer or authorized distributors?
All AT25QL321-SHE-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 AT25QL321-SHE-T meets industry standards.
7.What is the process for return or replacement of AT25QL321-SHE-T?
All AT25QL321-SHE-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25QL321-SHE-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 AT25QL321-SHE-T part is unused and in its original packaging.
Return procedure for AT25QL321-SHE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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