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Renesas AT45DQ321-MHF-Y
- Part No.:
- AT45DQ321-MHF-Y
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-UDFN Exposed Pad
- Datasheet:
-
AT45DQ321-MHF-Y.pdf
- Description:
- IC FLASH 32MBIT SPI 104MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,140
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Product details
Overview
AT45DQ321-MHF-Y 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 parameter logging.
For engineers reviewing the AT45DQ321-MHF-Y datasheet, AT45DQ321-MHF-Y pinout, AT45DQ321-MHF-Y application, or AT45DQ321-MHF-Y 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-MHF-Y implements a dual-SRAM-buffer architecture (512/528 bytes each) enabling concurrent buffer write and main array reprogramming. Its command set supports legacy SPI mode 0/3, Dual-I/O (3Bh/BBh opcodes), and Quad-I/O (6Bh/EBh opcodes) with hardware- and software-controlled sector protection.
It features programmable page size (factory-configurable to 512 bytes), on-the-fly buffer-to-main-memory page programming with or without built-in erase, and suspend/resume capability for program/erase operations - all operating across full industrial temperature range (–40 °C to +105 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 32 Mbit main array + 1 Mbit extra buffer space - supports firmware image storage and runtime data logging in resource-constrained systems. |
| Supply Voltage | 2.3 V to 3.6 V - enables direct interface with 2.5 V and 3.3 V microcontrollers without level-shifting. |
| Max SPI Clock Rate | 104 MHz - delivers up to 104 MB/s sequential read throughput in high-frequency mode (0Bh/1Bh opcodes). |
| Quad-I/O Read Speed | 70 MHz - achieves 280 MB/s effective bandwidth using four data lines, reducing host CPU wait states. |
| Page Size | Configurable 512 or 528 bytes - 528-byte default includes 16-byte overhead for ECC/metadata; 512-byte option maximizes usable payload per page. |
| Ultra-Deep Power-Down Current | 500 nA typical - extends battery life in always-on IoT edge nodes during extended sleep intervals. |
| Endurance & Retention | 100,000 cycles at –40 °C to +85 °C; 20-year data retention - suitable for automotive control module calibration storage. |
Pinout & Package
AT45DQ321-MHF-Y 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 industrial equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable for SPI command decoding; must be held low for entire command sequence including address and data phases. |
| SCK | Serial Clock | Input clock synchronizing all SPI transfers; supports up to 104 MHz with tV ≤ 7 ns clock-to-output timing. |
| 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; operates in single/dual/quad-output modes depending on opcode and configuration register setting. |
| WP | Write Protect | Hardware-enabled sector lock-down control; when asserted low, prevents modification of protected sectors regardless of software commands. |
| HOLD | Pause Transfer | Halts ongoing SPI transfer without deselecting device; allows host to service higher-priority interrupts mid-command. |
| VCC | Power Supply | 2.3–3.6 V supply; decoupling capacitor required within 10 mm of pin to maintain stable operation during rapid page programming. |
| GND | Ground | Reference for all I/O and internal circuitry; requires low-impedance connection to minimize noise coupling into sensitive analog blocks. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-SRAM Buffers | Two independent 512/528-byte buffers allow simultaneous reception of new data while reprogramming main memory - eliminates host wait time during firmware updates. |
| RapidS™ High-Speed Read | Supports 104 MHz SPI clock with 7 ns tV; enables continuous array reads at >10 MB/s without command overhead penalties. |
| Flexible Erase Granularity | Page (512/528 B), block (4 kB), sector (64 kB), and chip (32 Mbit) erase options - minimizes wear on frequently updated parameter sectors. |
| One-Time Programmable Security Register | 128-byte OTP register with 64-byte factory-unique ID and 64-byte user-programmable space - enables secure device binding and anti-cloning in certified industrial systems. |
| Program/Erase Suspend | Allows interrupting active program or erase operation to service urgent host requests, then resume from exact point - critical for real-time control loop integrity. |
Applications
| Industrial PLC Firmware Storage | Medical Device Calibration Data Logging |
|---|---|
Use Scenario: Storing boot firmware and field-upgradable application code in programmable logic controllers with strict uptime requirements. IC Role / Device Role / Timing Role: Non-volatile program memory with fast read access and robust write endurance under thermal cycling. Use Value: 100,000 program/erase cycles and 20-year retention ensure reliable operation over 15+ year product lifecycles in factory automation environments. | Use Scenario: Recording sensor calibration coefficients and usage logs in portable diagnostic instruments requiring traceable data integrity. IC Role / Device Role / Timing Role: Secure, tamper-resistant parameter storage with hardware write protection and OTP identity binding. Use Value: Sector lockdown and 128-byte OTP register prevent unauthorized modification of calibration values, satisfying IEC 62304 Class C software safety requirements. |
| Automotive ADAS Boot Image Storage | Smart Energy Meter Firmware Backup |
Use Scenario: Holding primary and fallback boot images for camera-based driver assistance modules operating across –40 °C to +105 °C. IC Role / Device Role / Timing Role: High-reliability serial flash with guaranteed operation at extended temperature and rapid startup from deep power-down. Use Value: 500 nA ultra-deep power-down current and full industrial temp rating enable cold-cranking readiness and low-quiescent-power parking mode compliance. | Use Scenario: Maintaining firmware backup and tariff configuration tables in utility-grade smart meters with 20+ year field deployment. IC Role / Device Role / Timing Role: Long-life, low-power nonvolatile memory supporting remote OTA updates and secure configuration management. Use Value: Dual-buffer architecture allows seamless background firmware patching without interrupting metering accuracy or communication uptime. |
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 capacity, 1.7–2.0 V supply, Quad-SPI only (no Dual-I/O), no SRAM buffers, 133 MHz max clock | Lacks dual-buffer concurrency and 2.3 V minimum supply; better suited for ultra-low-voltage portable devices | Select if system operates below 2.3 V or requires higher clock rates without buffer overlap needs |
| Macronix MX25L3233F | 32 Mbit, 2.7–3.6 V supply, standard SPI only (no Dual/Quad-I/O), no RapidS™, 100,000-cycle endurance | No high-speed I/O modes or suspend/resume; simpler command set but lower bandwidth and no concurrent operation | Select for cost-sensitive designs where 70+ MB/s read throughput and background programming are not required |
Compared with W25Q32JW and MX25L3233F, the AT45DQ321-MHF-Y uniquely combines dual-SRAM buffering, RapidS™ timing, 2.3 V minimum operation, and sector lockdown - making it optimal for industrial firmware storage where concurrent access, security, and wide voltage tolerance are mandatory.
Availability
AT45DQ321-MHF-Y is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device calibration logging, automotive ADAS boot image retention, and smart energy meter backup requiring stable component supply across long production lifecycles.
Supply support for AT45DQ321-MHF-Y 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 enterprise applications.
The AT45DQ321-MHF-Y belongs to Renesas' DataFlash® family - engineered specifically for high-reliability, high-speed serial flash applications demanding concurrent buffer operation, advanced security, and extended temperature resilience.
FAQ
What is the operating voltage range for the AT45DQ321-MHF-Y?
The AT45DQ321-MHF-Y operates from 2.3 V to 3.6 V. This 2.3 V minimum supply enables compatibility with modern low-voltage microcontrollers and eliminates the need for external level shifters in 2.5 V or 3.3 V systems. The device maintains full functionality-including RapidS™ read modes and program/erase operations-across this entire range, as verified in DC characteristics Table 39 and Table 40 of the official datasheet.
Does the AT45DQ321-MHF-Y support true Quad-I/O operation?
Yes, the AT45DQ321-MHF-Y supports true Quad-I/O operation using opcodes 6Bh (quad-output read) and EBh (quad-input buffer write), with verified 70 MHz performance and defined AC timing in Table 41. Quad mode must be enabled via the Configuration Register (CR); once set, MISO and MOSI pins function as bidirectional I/O lines alongside IO2 and IO3, delivering up to 280 MB/s effective bandwidth.
How does the dual-SRAM buffer architecture improve system performance in the AT45DQ321-MHF-Y?
The AT45DQ321-MHF-Y integrates two independent 512/528-byte SRAM buffers that operate concurrently with main memory programming. This allows a host MCU to load new data into one buffer while the other buffer's contents are being written to flash - eliminating idle time during firmware updates. This architecture directly enables zero-wait-state background programming, a capability confirmed in Section 2.2 ("Dual-SRAM Buffers") and Figure 2 of the AT45DQ321-MHF-Y datasheet.
What security mechanisms does the AT45DQ321-MHF-Y provide for protecting stored data?
The AT45DQ321-MHF-Y provides hardware- and software-based security including individual sector protection, permanent sector lockdown (via dedicated command 3Ch), and a 128-byte One-Time Programmable (OTP) Security Register with 64 bytes factory-programmed for unique device identification. These features are documented in Sections 8, 9, and Table 19 of the datasheet and enable tamper-resistant calibration storage and secure device authentication in regulated applications.
Can the AT45DQ321-MHF-Y be used in automotive applications requiring operation up to +105 °C?
Yes, the AT45DQ321-MHF-Y is rated for the full industrial temperature range of –40 °C to +105 °C, with validated endurance (10,000 program/erase cycles) and data retention (20 years) specified at the +105 °C upper limit. Its qualification per AEC-Q100 is not claimed, but its guaranteed parametric performance at +105 °C makes it suitable for under-hood ADAS modules, infotainment boot storage, and other non-safety-critical automotive subsystems where extended temperature operation is required.
AT45DQ321-MHF-Y Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-UDFN Exposed Pad
- Packaging:
- Tray
- 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-UDFN (5x6)
AT45DQ321-MHF-Y FAQ
1.How can I place an order for AT45DQ321-MHF-Y through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DQ321-MHF-Y 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-MHF-Y reliable?
The price and inventory of AT45DQ321-MHF-Y are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DQ321-MHF-Y is usually 5 days.
3.What payment methods are accepted for AT45DQ321-MHF-Y?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DQ321-MHF-Y transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DQ321-MHF-Y?
AT45DQ321-MHF-Y orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DQ321-MHF-Y 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-MHF-Y?
For technical support, including AT45DQ321-MHF-Y datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DQ321-MHF-Y requirements.
6.How does Aetrix verify that AT45DQ321-MHF-Y is sourced from the original manufacturer or authorized distributors?
All AT45DQ321-MHF-Y 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-MHF-Y meets industry standards.
7.What is the process for return or replacement of AT45DQ321-MHF-Y?
All AT45DQ321-MHF-Y units undergo pre-shipment inspection (PSI). If there is an issue with AT45DQ321-MHF-Y, 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-MHF-Y part is unused and in its original packaging.
Return procedure for AT45DQ321-MHF-Y:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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