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Renesas AT25DQ321-SH-B
- Part No.:
- AT25DQ321-SH-B
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25DQ321-SH-B.pdf
- Description:
- IC FLASH 32MBIT SPI 100MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,474
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Product details
Overview
AT45DQ321 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 clock-to-output time, and industrial temperature range (–40 °C to +85 °C). It serves as nonvolatile program/data storage in microcontroller boot loaders, firmware update buffers, and IoT edge node configuration storage.
For engineers reviewing the AT45DQ321 datasheet, AT45DQ321 pinout, AT45DQ321 application, or AT45DQ321 equivalent, key selection criteria include quad-mode throughput, ultra-deep power-down current (500 nA), page-size configurability (512/528 bytes), dual SRAM buffers for concurrent I/O, and sector lockdown security for firmware integrity.
Technical Context
The AT45DQ321 implements a two-buffer architecture with independent 512/528-byte SRAM buffers enabling simultaneous data reception into one buffer while reprogramming the main array from the other. Its command set supports RapidS™ high-speed mode, configurable Quad Enable bit, and hardware/software reset paths.
Memory organization includes 64 sectors (each 64 kB), 1024 blocks (each 4 kB), and 8192 pages (512/528 bytes); erase granularity spans page (512/528 B), block (4 kB), sector (64 kB), and full chip (32 Mbit). The device uses standard SPI modes 0 and 3 with dedicated opcodes for legacy, high-frequency, low-power, and dual/quad I/O reads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory density | 32 Mbit main array + 1 Mbit extra buffer space - enables separate firmware image staging and runtime parameter storage. |
| Supply voltage | 2.3 V to 3.6 V - compatible with modern low-voltage MCUs and battery-powered systems without level-shifting. |
| Max SPI clock frequency | 104 MHz - delivers up to 13 MB/s sequential read bandwidth in single-I/O mode. |
| Dual/Quad-I/O read speed | 70 MHz - achieves up to 35 MB/s (Dual) or 70 MB/s (Quad) effective throughput for fast boot code loading. |
| Page size | User-configurable 512 or 528 bytes - aligns with common MCU cache line sizes or legacy DataFlash compatibility requirements. |
| Ultra-deep power-down current | 500 nA typical - extends battery life in always-on sensor nodes during extended sleep intervals. |
| Endurance | 100,000 program/erase cycles at –40 °C to +85 °C - supports frequent field firmware updates over product lifetime. |
| Data retention | 20 years - ensures long-term reliability of stored calibration data and security credentials. |
Pinout & Package
AT45DQ321 is available in three RoHS-compliant packages: 8-lead SOIC (0.208" wide), 8-pad Ultra-thin DFN (5 × 6 × 0.6 mm), and 8-pad Very-thin DFN (6 × 8 × 1.0 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS# | Chip Select | Active-low enable for SPI command decoding; must be asserted before SCLK edge to initiate valid transaction. |
| SCK | Serial Clock | Input clock synchronizing all SPI transfers; supports up to 104 MHz with controlled slew rate per AC specs. |
| MOSI | Master Out Slave In | Serial input for commands, addresses, and write data; supports single/dual/quad input modes via opcode selection. |
| MISO | Master In Slave Out | Serial output for read data and status; operates in single/dual/quad output mode depending on active command. |
| WP# | Write Protect | Hardware-enabled sector protection control; low = lock selected sectors, high = allow program/erase operations. |
| HOLD# | Pause Transfer | Active-low suspend signal halting ongoing read/write without losing internal state; resumes on deassertion. |
| VCC | Power Supply | 2.3–3.6 V core supply; decoupling capacitor required per datasheet layout guidelines to maintain AC timing stability. |
| GND | Ground | Reference return path for all I/O and power; requires low-impedance connection to minimize noise coupling into SPI signals. |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM buffers (512/528 B each) | Enables pipelined operation: receive new data into Buffer 1 while programming Buffer 2 contents to main array - eliminates I/O idle time during writes. |
| Program/Erase Suspend & Resume | Allows interruption of long erase (e.g., sector/64 kB) or program operations to service high-priority reads - critical for real-time response in embedded control. |
| 128-byte OTP Security Register | Contains factory-programmed 64-byte unique ID + 64-byte user-writable space - supports secure boot key binding and device identity attestation. |
| Individual sector lock-down | Makes any sector permanently read-only after freeze command - prevents accidental or malicious overwrite of bootloader or calibration sectors. |
| Quad-enable configuration register | Software-controlled bit enabling high-speed Quad-I/O mode; persistent across power cycles when written to Configuration Register - simplifies system initialization. |
| Ultra-deep power-down mode | Reduces current to 500 nA while preserving memory contents - ideal for energy-harvesting or coin-cell-powered edge devices with multi-year duty cycles. |
Applications
| Firmware Update Buffer | Secure Bootloader Storage |
|---|---|
Use Scenario: Staging new firmware images in external memory prior to atomic swap with running application. IC Role / Device Role / Timing Role: Nonvolatile staging buffer with dual-SRAM architecture enabling background download while system remains operational. Use Value: Eliminates need for larger internal flash or external RAM; supports zero-downtime updates via buffer-to-main-memory page program with built-in erase. |
Use Scenario: Storing immutable bootloader code and public key certificates in tamper-resistant memory. IC Role / Device Role / Timing Role: Secure, lock-down protected storage for first-stage boot code and cryptographic keys. Use Value: Sector lockdown prevents runtime modification; OTP security register binds device identity to signature verification chain. |
| Industrial Sensor Configuration | Edge AI Model Parameter Storage |
Use Scenario: Retaining calibrated sensor offsets, gain factors, and environmental compensation tables across power cycles. IC Role / Device Role / Timing Role: High-reliability, 20-year-retention nonvolatile storage for mission-critical calibration metadata. Use Value: Page-erase granularity (512/528 B) allows updating individual sensor parameters without disturbing others; 100K endurance supports recalibration in field service. |
Use Scenario: Loading neural network weights and inference model parameters into edge inference accelerators. IC Role / Device Role / Timing Role: High-bandwidth Quad-I/O interface delivering >70 MB/s read throughput to feed accelerator DMA engines. Use Value: 70 MHz Quad-I/O read speed reduces model load latency; dual-buffer architecture enables prefetching next layer weights during current 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, 1.65–3.6 V supply, no dual-SRAM buffers, no program/erase suspend, 4 KB uniform sector erase only. | Lacks concurrent buffer operation and fine-grained page erase; suitable for simpler firmware storage without background updates. | Select when cost sensitivity outweighs need for pipelined writes or sector-level protection granularity. |
| Macronix MX25L3233F | 32 Mbit, 2.7–3.6 V supply, supports Quad I/O but no RapidS™, no OTP security register, no sector lockdown capability. | Missing hardware-enforced read-only locking and unique device ID - insufficient for secure boot implementations. | Choose where basic Quad-I/O performance suffices and security features are handled externally. |
Compared with W25Q32JW and MX25L3233F, the AT45DQ321 uniquely combines dual-SRAM buffering, program/erase suspend/resume, sector lockdown, and OTP security in a single 2.3 V–3.6 V device - making it optimal for secure, real-time firmware update architectures requiring minimal host MCU intervention.
Availability
AT45DQ321 is available at Aetrix Electronics and suitable for industrial automation controllers, medical diagnostic sensors, and automotive telematics modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AT45DQ321 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 specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and IoT applications.
The AT45DQ321 belongs to Renesas' DataFlash family, designed specifically for embedded systems needing high-reliability, low-voltage serial flash with advanced security, flexible erase, and concurrent I/O capabilities.
FAQ
What is the minimum operating voltage for the AT45DQ321?
The AT45DQ321 operates down to 2.3 V, enabling direct interface with 2.5 V and 3.3 V microcontrollers without level shifters. This low-voltage capability supports battery-powered designs and extends runtime in energy-constrained edge devices. The AT45DQ321 maintains full specification compliance-including 104 MHz SPI timing and 7 ns tV-across the entire 2.3 V to 3.6 V range.
Does the AT45DQ321 support true Quad-I/O read operations?
Yes, the AT45DQ321 supports true Quad-I/O read using opcode 0x6B, achieving up to 70 MHz effective clock rate and 70 MB/s peak throughput. Quad mode is enabled via the Configuration Register's QE bit and persists across power cycles. The AT45DQ321 also supports Dual-I/O (0x3B) and legacy single-I/O modes, ensuring backward compatibility while delivering scalable bandwidth.
How does the dual-SRAM buffer architecture improve system performance?
The AT45DQ321's two independent 512/528-byte SRAM buffers allow overlapping operations: one buffer receives incoming data via SPI while the other simultaneously programs its contents to main memory. This eliminates wait states during writes, reducing firmware update latency by up to 40% compared to single-buffer flash. The AT45DQ321 leverages this for seamless background downloads without halting application execution.
Can the AT45DQ321 be used in automotive applications requiring extended temperature range?
The AT45DQ321 is specified for the full industrial temperature range (–40 °C to +85 °C) and supports 10,000 program/erase cycles at –40 °C to +105 °C. While not AEC-Q100 qualified, its extended high-temp endurance and robust sector protection make it suitable for under-hood telematics, infotainment storage, and ADAS log buffers where qualification is managed at module level. Always verify thermal derating per board layout.
What security mechanisms does the AT45DQ321 provide beyond standard write protection?
Beyond WP# pin control, the AT45DQ321 provides software-configurable sector protection, permanent sector lockdown (freezeable via command), and a 128-byte OTP Security Register with factory-unique 64-byte ID. These features enable layered security: temporary lock during updates, irreversible lockdown of bootloader sectors, and cryptographically verifiable device identity. The AT45DQ321 integrates these without external components, reducing BOM count and attack surface.
AT25DQ321-SH-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 32Mbit
- Memory Organization:
- 256 Bytes x 16384 pages
- Memory Interface:
- SPI
- Clock Frequency:
- 100 MHz
- Write Cycle Time - Word, Page:
- 7µs, 3ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25DQ321-SH-B FAQ
1.How can I place an order for AT25DQ321-SH-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DQ321-SH-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 AT25DQ321-SH-B reliable?
The price and inventory of AT25DQ321-SH-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25DQ321-SH-B is usually 5 days.
3.What payment methods are accepted for AT25DQ321-SH-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DQ321-SH-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DQ321-SH-B?
AT25DQ321-SH-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DQ321-SH-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 AT25DQ321-SH-B?
For technical support, including AT25DQ321-SH-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DQ321-SH-B requirements.
6.How does Aetrix verify that AT25DQ321-SH-B is sourced from the original manufacturer or authorized distributors?
All AT25DQ321-SH-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 AT25DQ321-SH-B meets industry standards.
7.What is the process for return or replacement of AT25DQ321-SH-B?
All AT25DQ321-SH-B units undergo pre-shipment inspection (PSI). If there is an issue with AT25DQ321-SH-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 AT25DQ321-SH-B part is unused and in its original packaging.
Return procedure for AT25DQ321-SH-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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