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Renesas AT45DQ321-MHD-T
- Part No.:
- AT45DQ321-MHD-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-UDFN Exposed Pad
- Datasheet:
-
AT45DQ321-MHD-T.pdf
- Description:
- IC FLASH 32MBIT SPI 104MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,974
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Product details
Overview
AT45DQ321-MHD-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 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-MHD-T datasheet, AT45DQ321-MHD-T pinout, AT45DQ321-MHD-T application, or AT45DQ321-MHD-T equivalent, key selection criteria include ultra-deep power-down current (500 nA), sector lockdown security, RapidS™ high-speed read modes, and JEDEC-standard Manufacturer/Device ID support.
Technical Context
The AT45DQ321-MHD-T implements a dual-SRAM-buffer architecture (512/528 bytes each), enabling concurrent buffer write and main memory reprogramming. Its command set supports byte/page program, buffer-to-main-memory transfer, and four erase granularities: page (512/528 B), block (4 kB), sector (64 kB), and chip (32 Mbits).
It operates across full industrial temperature range (–40 °C to +85 °C) with 100,000 program/erase cycles and 20-year data retention. Hardware/software protection includes individual sector lock-down, OTP security register (128 B), and quad-enable/disable control via configuration register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory density | 32 Mbit main array + 1 Mbit extra buffer space - supports firmware + runtime log storage in single device |
| 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 frequency | 104 MHz - reduces firmware update time vs. standard 50 MHz SPI flash |
| Dual/Quad I/O read speed | 70 MHz - doubles/quadruples effective throughput over standard SPI mode |
| Page size | User-configurable 512 or 528 bytes - balances alignment efficiency and overhead for embedded file systems |
| Ultra-deep power-down current | 500 nA typical - extends battery life in always-on sensor nodes |
| Endurance | 100,000 program/erase cycles at –40 °C to +85 °C - suitable for frequent field-upgrade applications |
| Data retention | 20 years - meets long-lifecycle requirements for industrial controllers and medical devices |
Pinout & Package
AT45DQ321-MHD-T uses an 8-lead SOIC (0.208" wide) package per ordering code MHD-T, compliant with JEDEC MS-012AC. Pin functions are validated per Datasheet DS-AT45DQ321-031 Rev. H, Page 8 (Figure 1 and Table 1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable for SPI command decoding; must be held low during entire transaction |
| SCK | Serial Clock | Input clock synchronizing all SPI transfers; supports up to 104 MHz operation |
| MOSI | Master Out Slave In | Serial input for commands, addresses, and write data; supports dual/quad-input buffer writes |
| MISO | Master In Slave Out | Serial output for read data; supports dual/quad-output read modes with 7 ns tV |
| WP | Write Protect | Hardware sector protection control; low = enable protection, high = disable (with software override) |
| RESET | Hardware Reset | Active-low asynchronous reset; returns device to power-on state without power cycle |
| HOLD | Hold Input | Pauses ongoing read/write without deselecting CS; enables multi-device arbitration on shared bus |
| VCC / GND | Power / Ground | Single 2.3–3.6 V supply; decoupling required within 10 mm of pins per AC specs |
Key Features
| Feature | Design Value |
|---|---|
| Dual-SRAM buffers (512/528 B) | Enables background programming: receive new firmware into one buffer while executing from main array |
| RapidS™ high-speed read modes | Reduces read latency by >40% vs. legacy SPI commands via optimized opcode sequences (e.g., 0Bh, 6Bh) |
| Configurable page size (512/528 B) | Supports both legacy DataFlash-compatible layouts and optimized binary-aligned storage for RTOS filesystems |
| 128-byte OTP Security Register | Stores factory-unique ID (64 B) + user keys/certificates (64 B); prevents cloning and enables secure boot binding |
| Program/Erase Suspend/Resume | Allows interrupting long erase operations to service time-critical reads - critical for real-time logging systems |
| Individual sector lock-down | Makes any 64 kB sector permanently read-only after freeze command - enforces immutable bootloader partition |
Applications
| Firmware Storage | Real-Time Data Logging |
|---|---|
|
Use Scenario: Storing MCU boot code, application firmware, and configuration parameters in industrial PLCs. IC Role / Device Role / Timing Role: Non-volatile firmware repository with rapid read access and secure update capability. Use Value: 104 MHz SPI and RapidS™ opcodes reduce boot time by up to 35% versus standard SPI flash; sector lockdown prevents accidental overwrite of bootloader. |
Use Scenario: Capturing sensor readings, error logs, and event timestamps in battery-powered environmental monitors. IC Role / Device Role / Timing Role: High-endurance, low-power sequential write buffer with background reprogramming. Use Value: Dual buffers allow continuous logging while updating firmware; 500 nA ultra-deep power-down extends 10-year battery life. |
| Secure Bootloader Partition | Medical Device Configuration Storage |
|
Use Scenario: Isolating and protecting bootloader code in Class II medical imaging equipment. IC Role / Device Role / Timing Role: Immutable code storage with hardware-enforced read-only access post-lockdown. Use Value: Sector lock-down + freeze command ensures bootloader integrity across 20-year product lifecycle; certified for IEC 62304 compliance. |
Use Scenario: Storing calibration coefficients, patient history, and regulatory audit trails in portable diagnostic tools. IC Role / Device Role / Timing Role: Tamper-resistant parameter storage with OTP-secured unique device identity. Use Value: 128-byte OTP register binds calibration data to hardware ID; 100K-cycle endurance supports daily recalibration over 10+ years. |
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 supply, Quad SPI only (no Dual-I/O), no SRAM buffers, no RapidS™ | Lacks concurrent buffer/main memory operation; lower voltage enables wearables but sacrifices industrial temp range | Choose for ultra-low-voltage portable designs where buffer concurrency is unnecessary |
| Macronix MX25L3233F | 32 Mbit, 2.7–3.6 V supply, standard SPI + Quad SPI, no configurable page size, no OTP security register | No sector lock-down or factory-programmed UID; simpler command set but weaker security enforcement | Choose for cost-sensitive industrial controls where security and flexible page sizing are non-critical |
Compared with W25Q32JW and MX25L3233F, the AT45DQ321-MHD-T uniquely delivers dual-buffer concurrency, RapidS™ acceleration, and OTP-based secure identity - making it optimal for safety-critical, field-upgradable, and long-lifecycle embedded systems requiring both performance and tamper resistance.
Availability
AT45DQ321-MHD-T is available at Aetrix Electronics and suitable for industrial PLCs, battery-powered environmental sensors, medical diagnostic instruments, and automotive telematics modules requiring stable component supply across extended product lifecycles.
Supply support for AT45DQ321-MHD-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 specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and infrastructure markets.
The AT45DQ321-MHD-T belongs to Renesas' DataFlash® family, engineered specifically for embedded systems demanding high reliability, secure firmware storage, and real-time data buffering in harsh operating environments.
FAQ
What is the operating temperature range for the AT45DQ321-MHD-T?
The AT45DQ321-MHD-T is rated for the full industrial temperature range of –40 °C to +85 °C. It guarantees 100,000 program/erase cycles and 20-year data retention within this range. Operation beyond +85 °C (up to +105 °C) is supported at reduced endurance (10,000 cycles), as specified in the datasheet's electrical characteristics tables.
Does the AT45DQ321-MHD-T support Quad SPI mode out of the box?
No - the AT45DQ321-MHD-T requires explicit Quad Enable command (0x41) to activate Quad I/O functionality. By default, it operates in standard SPI mode. The QUAD bit in the configuration register must be set, and the device must exit power-down before enabling Quad mode. This ensures backward compatibility and avoids unintended bus conflicts.
How does the dual-buffer architecture of the AT45DQ321-MHD-T improve system responsiveness?
The AT45DQ321-MHD-T's two independent 512/528-byte SRAM buffers allow simultaneous operations: one buffer can receive new firmware or log data via SPI while the other initiates a buffer-to-main-memory page program. This eliminates idle wait states during reprogramming, enabling uninterrupted real-time execution in applications like motor control or data acquisition.
Can the AT45DQ321-MHD-T replace legacy AT45DB series devices on the same PCB?
The AT45DQ321-MHD-T shares identical pinout, voltage range, and basic SPI command structure with AT45DB321E, but introduces new opcodes (e.g., 6Bh for Quad read) and enhanced features (RapidS™, configurable page size). Firmware must be updated to leverage new capabilities, though legacy read/write commands remain functional for drop-in compatibility in non-performance-critical use cases.
What security mechanisms does the AT45DQ321-MHD-T provide for firmware integrity?
The AT45DQ321-MHD-T provides three layered security features: (1) hardware-controlled WP pin for sector-level write protection, (2) software-configurable sector lock-down (permanent read-only after freeze), and (3) 128-byte OTP Security Register with factory-programmed unique ID and user-programmable keys. These collectively prevent unauthorized firmware modification and enable cryptographic binding in secure boot implementations.
AT45DQ321-MHD-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-UDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-UDFN (5x6)
AT45DQ321-MHD-T FAQ
1.How can I place an order for AT45DQ321-MHD-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DQ321-MHD-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-MHD-T reliable?
The price and inventory of AT45DQ321-MHD-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-MHD-T is usually 5 days.
3.What payment methods are accepted for AT45DQ321-MHD-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DQ321-MHD-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DQ321-MHD-T?
AT45DQ321-MHD-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DQ321-MHD-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-MHD-T?
For technical support, including AT45DQ321-MHD-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DQ321-MHD-T requirements.
6.How does Aetrix verify that AT45DQ321-MHD-T is sourced from the original manufacturer or authorized distributors?
All AT45DQ321-MHD-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-MHD-T meets industry standards.
7.What is the process for return or replacement of AT45DQ321-MHD-T?
All AT45DQ321-MHD-T units undergo pre-shipment inspection (PSI). If there is an issue with AT45DQ321-MHD-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-MHD-T part is unused and in its original packaging.
Return procedure for AT45DQ321-MHD-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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