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Renesas AT45DQ321-SHF-T
- Part No.:
- AT45DQ321-SHF-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT45DQ321-SHF-T.pdf
- Description:
- IC FLASH 32MBIT SPI 104MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,585
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Product details
Overview
AT45DQ321-SHF-T from Renesas Electronics is a 32-Mbit SPI serial flash memory with 1-Mbit extra buffer space, supporting Dual-I/O and Quad-I/O read/write operations, 104 MHz SPI clock rate, 7 ns max clock-to-output time, and configurable 512/528-byte page size - deployed in industrial embedded systems for firmware storage and real-time data logging.
For engineers reviewing the AT45DQ321-SHF-T datasheet, AT45DQ321-SHF-T pinout, AT45DQ321-SHF-T application, or AT45DQ321-SHF-T equivalent, this page delivers verified electrical specs, JEDEC-compliant ID support, RapidS™ high-speed operation modes, sector-level hardware/software protection, and ultra-deep power-down (500 nA) for battery-sensitive designs.
Technical Context
The AT45DQ321-SHF-T implements a dual-buffered architecture with two independent 512/528-byte SRAM buffers, enabling concurrent receive-and-program operations. Its command set supports legacy SPI (modes 0/3), Dual-I/O (3Bh/BBh opcodes), and Quad-I/O (6Bh/EBh opcodes) with dedicated enable/disable sequences.
It integrates programmable sector protection, permanent sector lockdown via OTP register, and a 128-byte security register (64-byte factory-unique ID + 64-byte user-programmable). Erase granularity spans page (512/528 B), block (4 kB), sector (64 kB), and full chip (32 Mbit), all with suspend/resume capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit main array + 1 Mbit extra buffer space - supports firmware images up to ~4 MB with redundant logging area |
| Supply Voltage | 2.3 V to 3.6 V - enables direct interface with 2.5 V/3.3 V microcontrollers without level shifting |
| Max SPI Clock Rate | 104 MHz - reduces firmware update time by >2× vs. standard 50 MHz SPI flash |
| Quad-I/O Read Speed | 70 MHz - delivers sustained 35 MB/s effective throughput using 4-bit parallel data lanes |
| Page Size | User-configurable 512 or 528 bytes - aligns with common MCU DMA burst sizes and avoids internal padding overhead |
| Power-Down Current | 500 nA ultra-deep mode - extends 10-year battery life in IoT endpoint nodes with infrequent wake-up cycles |
| Endurance | 100,000 program/erase cycles at -40°C to +85°C - suitable for field-upgradable control logic with daily reprogramming |
| Data Retention | 20 years - meets long-lifecycle requirements for industrial PLCs and medical devices |
Pinout & Package
AT45DQ321-SHF-T uses an 8-pad Ultra-thin DFN package (5 mm × 6 mm × 0.6 mm), RoHS-compliant and halide-free, optimized for space-constrained PCB layouts in portable and automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS# | Chip Select Input | Active-low enable for SPI command decoding; must be held low during entire multi-byte transaction |
| SCK | Serial Clock Input | Drives all timing for command, address, and data transfers; supports up to 104 MHz frequency |
| MOSI | Master-Out Slave-In Input | Carries commands, addresses, and write data; supports single/dual/quad input modes per configuration register |
| MISO | Master-In Slave-Out Output | Returns status, IDs, and read data; supports single/dual/quad output with opcode-dependent lane count |
| WP# | Write Protect Input | Hardware lock for sector protection; when low, prevents accidental erase/program of protected sectors |
| RESET# | Hardware Reset Input | Asynchronous active-low reset that clears internal state and exits deep power-down mode |
| HOLD# | Hold Input | Suspends ongoing read/write without deselecting device; retains bus ownership during interrupt servicing |
| VSS | Ground | Reference return path for all I/O and core logic; requires low-inductance connection to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Dual/Quad I/O Read & Write | Enables 2× or 4× bandwidth over standard SPI - cuts boot time and OTA update latency in resource-constrained hosts |
| Two Independent SRAM Buffers | Allows background page programming while host writes next buffer - eliminates dead time in continuous data streaming |
| Program/Erase Suspend & Resume | Permits urgent reads or small writes during long erase cycles - critical for real-time control loop responsiveness |
| 128-byte OTP Security Register | Provides tamper-resistant device identity and secure key storage - foundational for secure boot and firmware authentication |
| Ultra-Deep Power-Down Mode | Reduces current to 500 nA - extends shelf life and operational runtime in energy-harvesting sensor nodes |
| JEDEC Manufacturer/Device ID | Guarantees interoperability with standard flash programming tools and bootloader auto-detection logic |
Applications
| Firmware Storage in Industrial PLCs | Secure Boot Code Storage |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers operating across -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Non-volatile code storage with fast Quad-I/O read access for deterministic boot timing and in-field updates. Use Value: 70 MHz Quad-I/O read ensures <100 ms firmware load time; 100,000-cycle endurance supports quarterly feature upgrades over 10+ years. |
Use Scenario: Holding immutable root-of-trust code and cryptographic keys in medical imaging equipment requiring FDA compliance. IC Role / Device Role / Timing Role: Secure, tamper-evident boot image repository leveraging OTP security register and sector lockdown. Use Value: Factory-programmed 64-byte unique ID binds firmware to hardware; lockdown prevents post-deployment modification of boot sector. |
| Data Logging in Automotive Telematics | Firmware Over-the-Air (OTA) Buffering |
Use Scenario: Capturing CAN bus diagnostics and GPS timestamps in vehicle telematics units with intermittent power. IC Role / Device Role / Timing Role: High-reliability sequential write buffer with page-erase flexibility and ultra-low deep-power current. Use Value: Dual-buffer architecture allows simultaneous log capture and flash commit; 500 nA ultra-deep mode preserves logs during ignition-off periods. |
Use Scenario: Receiving and staging full firmware images prior to atomic update in connected home gateways. IC Role / Device Role / Timing Role: Dual-SRAM buffer acts as staging area for validated OTA payloads before main array overwrite. Use Value: Buffer-to-main-memory page program with built-in erase enables zero-downtime firmware swaps; suspend/resume avoids service interruption during update. |
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, 1.65–3.6 V supply, Quad SPI only (no Dual-I/O), 133 MHz max clock, no SRAM buffers | Lacks concurrent buffer operation and RapidS™ compatibility; requires host-side buffering logic | Choose when higher clock speed is prioritized over dual-buffer efficiency and legacy SPI mode support |
| Macronix MX25L3233F | 32 Mbit, 2.3–3.6 V, supports Dual/Quad I/O but no configurable page size or OTP security register | No factory-unique ID or sector lockdown; limited protection granularity (block-level only) | Choose when basic Quad-I/O performance suffices and advanced security features are not required |
Compared with W25Q32JW and MX25L3233F, the AT45DQ321-SHF-T uniquely combines dual-SRAM buffering, RapidS™ acceleration, factory-programmed UID, and sector-level lockdown - making it optimal for safety-critical, update-intensive, and space-constrained embedded systems where reliability and security coexist with bandwidth demands.
Availability
AT45DQ321-SHF-T is available at Aetrix Electronics and suitable for industrial automation, automotive telematics, and medical device firmware storage requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AT45DQ321-SHF-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 microcontrollers, analog, power, and memory solutions for industrial, automotive, and infrastructure markets.
The AT45DQ321-SHF-T belongs to Renesas' DataFlash® family, engineered specifically for high-reliability embedded systems needing fast, flexible, and secure serial flash with integrated buffer architecture and robust data integrity features.
FAQ
What voltage range does the AT45DQ321-SHF-T support?
The AT45DQ321-SHF-T operates from 2.3 V to 3.6 V, enabling direct integration with 2.5 V and 3.3 V logic families without external level shifters. This wide supply range ensures compatibility with diverse host processors and simplifies power design in mixed-voltage systems. The AT45DQ321-SHF-T maintains full functionality-including 104 MHz SPI operation and Quad-I/O modes-across the entire voltage window.
Does the AT45DQ321-SHF-T support both SPI modes 0 and 3?
Yes, the AT45DQ321-SHF-T is fully compatible with SPI modes 0 and 3, as confirmed in its official datasheet. This dual-mode support allows seamless interfacing with a broad range of microcontrollers and FPGAs regardless of their default clock polarity and phase settings. The AT45DQ321-SHF-T automatically adapts to the host's selected mode without requiring configuration changes.
How does the dual-buffer architecture of the AT45DQ321-SHF-T improve system performance?
The AT45DQ321-SHF-T integrates two independent 512/528-byte SRAM buffers, enabling true overlap between data reception and flash programming. While one buffer streams incoming data, the other simultaneously programs the main memory array-eliminating idle bus cycles. This architecture directly reduces firmware update and data logging latency in the AT45DQ321-SHF-T, especially under continuous streaming workloads.
What is the purpose of the 128-byte OTP Security Register in the AT45DQ321-SHF-T?
The AT45DQ321-SHF-T includes a 128-byte One-Time Programmable Security Register: 64 bytes are factory-programmed with a unique device identifier, and 64 bytes are user-programmable for keys or certificates. This register supports secure boot, anti-cloning, and firmware authentication. Once written, OTP bits cannot be altered-ensuring persistent trust anchors in the AT45DQ321-SHF-T for regulated applications like medical or industrial control.
Can the AT45DQ321-SHF-T enter ultra-low-power states, and what are the current levels?
Yes, the AT45DQ321-SHF-T supports Ultra-Deep Power-Down mode with typical current consumption of 500 nA, and Deep Power-Down mode at 3 µA. These states retain full memory contents while minimizing energy draw-ideal for battery-powered edge sensors and maintenance-free deployments. Exiting either state requires only a hardware RESET# pulse or CS# toggle, ensuring rapid resumption in the AT45DQ321-SHF-T without lengthy initialization sequences.
AT45DQ321-SHF-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
- Memory Size:
- 32Mbit
- Memory Organization:
- 528 Bytes x 8192 pages
- Memory Interface:
- SPI
- Clock Frequency:
- 104 MHz
- Write Cycle Time - Word, Page:
- 8µs, 4ms
- Access Time:
- -
- Voltage - Supply:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT45DQ321-SHF-T FAQ
1.How can I place an order for AT45DQ321-SHF-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DQ321-SHF-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 AT45DQ321-SHF-T reliable?
The price and inventory of AT45DQ321-SHF-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DQ321-SHF-T is usually 5 days.
3.What payment methods are accepted for AT45DQ321-SHF-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DQ321-SHF-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DQ321-SHF-T?
AT45DQ321-SHF-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DQ321-SHF-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 AT45DQ321-SHF-T?
For technical support, including AT45DQ321-SHF-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DQ321-SHF-T requirements.
6.How does Aetrix verify that AT45DQ321-SHF-T is sourced from the original manufacturer or authorized distributors?
All AT45DQ321-SHF-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 AT45DQ321-SHF-T meets industry standards.
7.What is the process for return or replacement of AT45DQ321-SHF-T?
All AT45DQ321-SHF-T units undergo pre-shipment inspection (PSI). If there is an issue with AT45DQ321-SHF-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 AT45DQ321-SHF-T part is unused and in its original packaging.
Return procedure for AT45DQ321-SHF-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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