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Renesas AT45DQ321-SHD-B
- Part No.:
- AT45DQ321-SHD-B
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT45DQ321-SHD-B.pdf
- Description:
- IC FLASH 32MBIT SPI 104MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,696
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Product details
Overview
AT45DQ321 from Renesas Electronics is a 32-Mbit SPI serial flash memory with integrated 1-Mbit extra storage, 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 parameter logging.
For engineers reviewing the AT45DQ321 datasheet, AT45DQ321 pinout, AT45DQ321 application, or AT45DQ321 equivalent, key selection considerations include its dual/quad I/O throughput, ultra-deep power-down current (500 nA), sector lockdown security, RapidS™ high-speed mode compatibility, and industrial temperature range (-40 °C to +105 °C) support.
Technical Context
The AT45DQ321 implements a dual-buffered architecture with two independent 512/528-byte SRAM buffers enabling concurrent data reception and main array reprogramming. Its command set supports byte/page programming, buffer-to-main-memory transfers, and four erase granularities (page/4 kB block/64 kB sector/chip).
It operates across SPI modes 0 and 3, includes hardware/software reset control, JEDEC-standard Manufacturer and Device ID read (9Fh), and supports programmable configuration via Configuration Register (e.g., Quad Enable/Disable). Security features include 128-byte OTP register (64-byte factory UID + 64-byte user-programmable) and per-sector lock-down capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory capacity | 32 Mbit main array + 1 Mbit extra storage - enables firmware + calibration data co-storage without external memory expansion |
| Supply voltage | 2.3 V to 3.6 V - compatible with modern low-voltage microcontrollers and battery-backed systems |
| Max SPI frequency | 104 MHz - delivers up to 13 MB/s sequential read in high-frequency mode (0Bh/1Bh opcodes) |
| Quad-I/O read speed | 70 MHz - achieves ~35 MB/s effective bandwidth using 4-bit data bus |
| Power-down current | 500 nA ultra-deep power-down - extends battery life in always-on sensor nodes and IoT endpoints |
| Endurance | 100,000 program/erase cycles at -40 °C to +85 °C - suitable for frequent field-upgrade applications |
| Data retention | 20 years - ensures long-term reliability in unattended infrastructure equipment |
Pinout & Package
AT45DQ321-SHD-B uses an 8-lead SOIC (0.208" wide) package, RoHS-compliant and green (Pb/halide-free), rated for industrial temperature operation (-40 °C to +105 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable for SPI command execution; must be asserted before clock edge to initiate valid transaction |
| SCK | Serial Clock | Input clock synchronizing all SPI data transfers; supports up to 104 MHz in standard SPI mode |
| MOSI | Master Out Slave In | Serial input for commands, addresses, and write data; supports single/dual/quad-input buffer writes |
| MISO | Master In Slave Out | Serial output for read data and status; supports single/dual/quad-output reads with selectable opcodes |
| WP | Write Protect | Hardware-enabled sector protection; low state locks selected sectors against accidental program/erase |
| RESET | Hardware Reset | Active-low asynchronous reset that clears internal state and returns device to power-on default configuration |
| VCC | Power Supply | 2.3–3.6 V supply; decoupling capacitor required per datasheet layout guidelines |
| GND | Ground | Reference return path for all digital and analog circuitry; requires low-impedance PCB connection |
Key Features
| Feature | Design Value |
|---|---|
| Dual/Quad I/O interface | Enables 2× or 4× data throughput vs. standard SPI - reduces firmware update time and host CPU overhead |
| Two independent 512/528-byte buffers | Allows background programming: receive new data into one buffer while erasing/writing the other to main array |
| Program/Erase Suspend/Resume | Permits interrupting long erase operations to service urgent read requests - critical for real-time system responsiveness |
| 128-byte OTP Security Register | Provides tamper-resistant storage for unique device ID (factory-programmed) and secure keys (user-programmable) |
| Individual sector lock-down | Makes any 64 kB sector permanently read-only after freeze command - prevents malicious or erroneous overwrite of boot code |
Applications
| Firmware Storage | Industrial Data Logging |
|---|---|
Use Scenario: Storing MCU boot code, application binaries, and configuration images in PLCs and motor drives. IC Role / Device Role / Timing Role: Nonvolatile program memory accessed during cold start and OTA updates via SPI interface. Use Value: 20-year data retention and 100K endurance ensure reliable operation over product lifetime without refresh cycles. | Use Scenario: Capturing sensor readings, error logs, and operational timestamps in remote telemetry units. IC Role / Device Role / Timing Role: Sequential write buffer memory supporting burst capture and periodic flash commit. Use Value: Dual-buffer architecture allows continuous logging while background pages are erased and rewritten - no data loss during maintenance windows. |
| Secure Boot Configuration | Edge AI Model Parameter Storage |
Use Scenario: Holding cryptographic keys, signature verification certificates, and immutable boot loader checksums. IC Role / Device Role / Timing Role: Secure nonvolatile storage with sector lock-down and OTP register for root-of-trust elements. Use Value: 64-byte factory UID and permanent sector lockdown prevent cloning and unauthorized firmware modification. | Use Scenario: Storing inference model weights and calibration coefficients updated via wireless edge updates. IC Role / Device Role / Timing Role: High-bandwidth Quad-I/O flash supporting rapid weight reloads between inference sessions. Use Value: 70 MHz Quad-I/O read speed enables sub-100 ms model reload - critical for low-latency adaptive inference. |
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 supply, 133 MHz max SPI, no built-in extra memory or dual-buffer architecture | Lacks dedicated extra 1-Mbit area and concurrent buffer operation - less suited for simultaneous log+firmware storage | Preferred where highest SPI speed and density are primary; requires external buffering logic for overlap operations |
| Macronix MX25L3233F | 32 Mbit, 2.3–3.6 V, 104 MHz SPI, supports Dual/Quad I/O but no RapidS™ or ultra-deep power-down (1 µA typical) | No 500 nA ultra-deep power-down mode or OTP security register - weaker for battery-powered secure nodes | Better for cost-sensitive industrial controllers where ultra-low sleep current and hardware security are not required |
Compared with W25Q32JW and MX25L3233F, the AT45DQ321 uniquely integrates dual SRAM buffers, 1-Mbit extra memory, 500 nA deep power-down, and factory-programmed UID - making it optimal for resource-constrained, secure, and battery-aware embedded systems requiring concurrent firmware and data management.
Availability
AT45DQ321-SHD-B is available at Aetrix Electronics and suitable for industrial automation, edge AI inference devices, and secure IoT gateways requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AT45DQ321-SHD-B 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, and IoT markets.
The AT45DQ321 belongs to Renesas' DataFlash® family, engineered specifically for high-reliability embedded systems needing fast, secure, and low-power nonvolatile storage with advanced command flexibility and robust data integrity features.
FAQ
What is the operating voltage range for the AT45DQ321-SHD-B?
The AT45DQ321-SHD-B operates from 2.3 V to 3.6 V. This wide low-voltage range supports direct interfacing with 2.5 V and 3.3 V microcontrollers and enables use in battery-powered systems with declining supply rails. The minimum 2.3 V threshold ensures functionality even under brown-out conditions common in energy-harvesting designs.
Does the AT45DQ321-SHD-B support Quad-I/O read operations?
Yes, the AT45DQ321-SHD-B supports Quad-I/O read operations using opcode 6Bh, achieving up to 70 MHz clock rate and ~35 MB/s effective bandwidth. Quad mode must be enabled via the Configuration Register (CR) using the Quad Enable command (35h), and is fully compliant with JEDEC JESD216 standards for SFDP-compatible initialization.
How does the dual-buffer architecture of the AT45DQ321-SHD-B improve system performance?
The AT45DQ321-SHD-B's two independent 512/528-byte SRAM buffers allow overlapping operations: while one buffer receives incoming data via SPI, the other can simultaneously program or erase a page in main memory. This eliminates idle time during firmware updates or data logging, reducing total operation latency by up to 40% compared to single-buffer flash devices.
What security features are implemented in the AT45DQ321-SHD-B?
The AT45DQ321-SHD-B includes hardware-based sector protection (via WP pin), software-configurable sector lock-down (permanent read-only enforcement), and a 128-byte One-Time Programmable Security Register - with 64 bytes pre-programmed with a unique factory UID and 64 bytes user-programmable for keys or certificates. These features collectively establish a hardware root of trust for secure boot and firmware validation.
Can the AT45DQ321-SHD-B operate across the full industrial temperature range?
Yes, the AT45DQ321-SHD-B is specified for operation from -40 °C to +105 °C. Its electrical characteristics, including program/erase endurance (10,000 cycles at +105 °C) and data retention (20 years), are guaranteed across this extended range - making it suitable for under-hood automotive modules, factory-floor controllers, and outdoor telecom infrastructure where thermal stress is significant.
AT45DQ321-SHD-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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:
- 2.5V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT45DQ321-SHD-B FAQ
1.How can I place an order for AT45DQ321-SHD-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DQ321-SHD-B 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-SHD-B reliable?
The price and inventory of AT45DQ321-SHD-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DQ321-SHD-B is usually 5 days.
3.What payment methods are accepted for AT45DQ321-SHD-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DQ321-SHD-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DQ321-SHD-B?
AT45DQ321-SHD-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DQ321-SHD-B 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-SHD-B?
For technical support, including AT45DQ321-SHD-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DQ321-SHD-B requirements.
6.How does Aetrix verify that AT45DQ321-SHD-B is sourced from the original manufacturer or authorized distributors?
All AT45DQ321-SHD-B 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-SHD-B meets industry standards.
7.What is the process for return or replacement of AT45DQ321-SHD-B?
All AT45DQ321-SHD-B units undergo pre-shipment inspection (PSI). If there is an issue with AT45DQ321-SHD-B, 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-SHD-B part is unused and in its original packaging.
Return procedure for AT45DQ321-SHD-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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