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Renesas AT45DQ321-MHD2B-T
- Part No.:
- AT45DQ321-MHD2B-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-UDFN Exposed Pad
- Datasheet:
-
AT45DQ321-MHD2B-T.pdf
- Description:
- IC FLASH 32MBIT SPI 104MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,711
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Product details
Overview
AT45DQ321-MHD2B-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 parameter logging.
For engineers reviewing the AT45DQ321-MHD2B-T datasheet, AT45DQ321-MHD2B-T pinout, AT45DQ321-MHD2B-T application, or AT45DQ321-MHD2B-T equivalent, key selection considerations include its ultra-deep power-down current (500 nA), sector lockdown security, RapidS™ high-speed read modes, and dual-SRAM-buffer architecture enabling concurrent write-and-erase operations.
Technical Context
The AT45DQ321-MHD2B-T implements a two-buffer SRAM architecture (512/528 bytes each) that enables overlapping data reception into one buffer while reprogramming the main array from the other. Its command set supports legacy SPI mode 0/3 and RapidS™ variants with dedicated opcodes for Dual-I/O (3Bh/BBh) and Quad-I/O (6Bh/EBh) reads.
It features hardware- and software-controlled sector protection, including individual sector lock-down to permanently disable writes, plus a 128-byte OTP security register (64 bytes factory-programmed unique ID, 64 bytes user-programmable). Erase granularity spans page (512/528 B), block (4 kB), sector (64 kB), and full chip (32 Mbit).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory capacity | 32 Mbit main array + 1 Mbit extra buffer space - supports firmware image storage with dedicated parameter/log partitioning |
| Supply voltage | 2.3 V to 3.6 V - compatible with modern low-voltage industrial microcontrollers without level-shifting |
| Max SPI frequency | 104 MHz - enables sub-300 µs read of 512-byte page in high-frequency mode (0Bh/1Bh) |
| Quad-I/O read speed | 70 MHz - delivers up to 280 MB/s effective throughput using 4-bit data bus |
| Power-down current | 500 nA ultra-deep power-down - extends battery life in always-on sensor nodes and metering devices |
| 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 deployments |
Pinout & Package
AT45DQ321-MHD2B-T uses an 8-pad Very-thin DFN package (6 mm × 8 mm × 1.0 mm), RoHS-compliant and optimized for space-constrained industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable for SPI command execution; must be held low during entire multi-byte transaction |
| SCK | Serial Clock | Input timing reference for all SPI transfers; supports up to 104 MHz with 7 ns tV (clock-to-output) |
| MOSI | Master Out Slave In | Serial input for commands, addresses, and write data; supports single/dual/quad-input buffer write modes |
| MISO | Master In Slave Out | Serial output for read data; supports single/dual/quad-output read with dedicated opcodes (03h/3Bh/6Bh) |
| WP | Write Protect | Hardware-enabled sector protection control; active-low signal locks protected sectors against accidental writes |
| RESET | Hardware Reset | Active-low asynchronous reset; returns device to power-on state and clears status register flags |
| HOLD | Pause Transfer | Active-low suspend/resume control for ongoing read/write operations without CS deassertion |
| VSS | Ground | Reference return path for all I/O and core logic; requires low-impedance connection to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Dual-SRAM buffers (512/528 B) | Enables real-time data streaming: receive new data into Buffer 1 while programming Buffer 2 contents to main array |
| RapidS™ high-speed read modes | Reduces 512-byte page read latency to ≤290 µs via optimized command sequences (0Bh/1Bh opcodes) |
| Configurable page size | Factory-set 512-byte pages maximize compatibility with legacy DataFlash systems; 528-byte default supports ECC-ready layouts |
| Program/Erase suspend/resume | Allows interruption of long erase (e.g., sector/64 kB) to service urgent read requests, minimizing system latency |
| 128-byte OTP security register | Provides tamper-resistant device identity (64-byte factory UID) and secure key storage (64-byte user space) |
Applications
| Firmware Storage | Industrial Data Logging |
|---|---|
Use Scenario: Storing boot code and application firmware for ARM Cortex-M microcontrollers in PLCs and motor drives. IC Role / Device Role / Timing Role: Nonvolatile code storage with fast random-access read capability and robust write endurance. Use Value: Enables over-the-air firmware updates with verified sector lockdown to prevent corruption during power loss. |
Use Scenario: Capturing sensor readings (temperature, pressure, vibration) at 100 Hz in predictive maintenance gateways. IC Role / Device Role / Timing Role: High-reliability sequential write buffer with dual-SRAM architecture for gapless logging. Use Value: Sustains 100 k-cycle endurance across 20-year deployment while maintaining 500 nA deep-sleep current. |
| Secure Configuration Storage | Medical Device Parameter Backup |
Use Scenario: Storing calibrated sensor offsets, calibration coefficients, and regulatory compliance flags in diagnostic equipment. IC Role / Device Role / Timing Role: Secure, write-protected nonvolatile memory with hardware WP pin and software sector lockdown. Use Value: Prevents unauthorized modification via 64-byte OTP UID binding and permanent sector lock-down capability. |
Use Scenario: Retaining patient-specific therapy parameters and usage history in portable infusion pumps and ventilators. IC Role / Device Role / Timing Role: Long-retention (20 yr), low-power backup memory compliant with IEC 62304 Class C requirements. Use Value: Guarantees data integrity across battery swaps and thermal cycling (-40 °C to +105 °C operation). |
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, 100 k-cycle endurance | Lacks concurrent buffer operation and RapidS™ modes; requires host-side buffering for streaming | Preferred where ultra-low voltage (1.7 V) operation is mandatory and buffer concurrency is not required |
| Macronix MX25L3233F | 32 Mbit, 2.3–3.6 V, standard SPI + Quad-I/O, no SRAM buffers, 100 k-cycle endurance, no OTP register | No dual-buffer architecture or 128-byte OTP security register; simpler command set | Selected when cost sensitivity outweighs need for hardware-based sector lockdown and secure UID storage |
Compared with W25Q32JW and MX25L3233F, the AT45DQ321-MHD2B-T uniquely delivers simultaneous buffer read/write, RapidS™ acceleration, and factory-programmed UID - making it optimal for safety-critical, high-throughput, and secure firmware/data storage where concurrent operations and traceability are essential.
Availability
AT45DQ321-MHD2B-T is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and smart metering applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AT45DQ321-MHD2B-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-MHD2B-T belongs to Renesas' DataFlash family, engineered specifically for high-reliability, low-power, and secure serial flash applications in harsh-environment embedded systems.
FAQ
What is the operating temperature range for the AT45DQ321-MHD2B-T?
The AT45DQ321-MHD2B-T is rated for the full industrial temperature range of -40 °C to +85 °C, with extended operation up to +105 °C at reduced endurance (10,000 cycles). This makes the AT45DQ321-MHD2B-T suitable for deployment in outdoor industrial controllers, automotive under-hood modules, and medical equipment requiring wide thermal stability.
Does the AT45DQ321-MHD2B-T support true Quad-SPI mode with 4-line address and data transfer?
Yes, the AT45DQ321-MHD2B-T supports true Quad-I/O operation for both read (6Bh/EBh opcodes) and write (32h/72h opcodes) using four data lines (IO0–IO3). It achieves 70 MHz Quad-I/O read performance with 280 MB/s effective bandwidth, confirmed in Section 5.1 and Table 41 of the DS-AT45DQ321-031 datasheet.
How does the dual-SRAM buffer architecture improve system-level performance in the AT45DQ321-MHD2B-T?
The AT45DQ321-MHD2B-T's two independent 512/528-byte SRAM buffers allow simultaneous operations: while one buffer streams incoming data from the host, the other can be programmed into main memory. This eliminates write stalls and enables continuous data acquisition - critical for real-time logging in AT45DQ321-MHD2B-T-based gateway and sensor hub designs.
Can the AT45DQ321-MHD2B-T be used as a direct replacement for legacy AT45DB321 devices?
The AT45DQ321-MHD2B-T maintains pin-to-pin compatibility and command-set backward compatibility with AT45DB321, but adds Dual-I/O/Quad-I/O, RapidS™, and enhanced security features. Migration requires verifying page size configuration (512 vs. 528 bytes) and enabling new opcodes - the AT45DQ321-MHD2B-T supports seamless upgrade paths without PCB changes.
What security mechanisms does the AT45DQ321-MHD2B-T provide beyond standard write protection?
Beyond WP pin and software sector protection, the AT45DQ321-MHD2B-T provides sector lockdown (permanent read-only enforcement), a 128-byte OTP security register (64-byte factory UID + 64-byte user space), and freeze-lock capability for lockdown registers. These features are documented in Sections 8–9 of the AT45DQ321-MHD2B-T datasheet and enable certified secure storage in regulated applications.
AT45DQ321-MHD2B-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:
- 512 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-MHD2B-T FAQ
1.How can I place an order for AT45DQ321-MHD2B-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DQ321-MHD2B-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-MHD2B-T reliable?
The price and inventory of AT45DQ321-MHD2B-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-MHD2B-T is usually 5 days.
3.What payment methods are accepted for AT45DQ321-MHD2B-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DQ321-MHD2B-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DQ321-MHD2B-T?
AT45DQ321-MHD2B-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DQ321-MHD2B-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-MHD2B-T?
For technical support, including AT45DQ321-MHD2B-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DQ321-MHD2B-T requirements.
6.How does Aetrix verify that AT45DQ321-MHD2B-T is sourced from the original manufacturer or authorized distributors?
All AT45DQ321-MHD2B-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-MHD2B-T meets industry standards.
7.What is the process for return or replacement of AT45DQ321-MHD2B-T?
All AT45DQ321-MHD2B-T units undergo pre-shipment inspection (PSI). If there is an issue with AT45DQ321-MHD2B-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-MHD2B-T part is unused and in its original packaging.
Return procedure for AT45DQ321-MHD2B-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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