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Renesas AT45DQ321-MWHF2B-T
- Part No.:
- AT45DQ321-MWHF2B-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
AT45DQ321-MWHF2B-T.pdf
- Description:
- IC FLASH 32MBIT SPI 104MHZ 8VDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,995
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Product details
Overview
AT45DQ321-MWHF2B-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 boot code execution.
For engineers reviewing the AT45DQ321-MWHF2B-T datasheet, AT45DQ321-MWHF2B-T pinout, AT45DQ321-MWHF2B-T application, or AT45DQ321-MWHF2B-T equivalent, key selection considerations include voltage range (2.3–3.6 V), industrial temperature support (−40 °C to +105 °C), ultra-deep power-down current (500 nA), sector lockdown capability, and RapidS™ high-speed read modes.
Technical Context
The AT45DQ321-MWHF2B-T implements a dual-buffered architecture with two independent 512/528-byte SRAM buffers enabling concurrent data reception and main array reprogramming. It supports SPI modes 0 and 3, plus RapidS™-optimized command sets for accelerated continuous and page reads using 0Bh, 1Bh, and 6Bh opcodes.
Its memory organization includes 64 sectors (each 64 kB), 1024 blocks (each 4 kB), and 8192 pages (512/528 bytes), with flexible erase granularity - page, block, sector, or full chip - and hardware/software sector protection via dedicated registers and WP pin control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory density | 32 Mbit main array + 1 Mbit extra buffer space - supports large firmware images and secure parameter storage. |
| Supply voltage | 2.3 V to 3.6 V - enables direct interface with 2.5 V and 3.3 V logic domains without level shifting. |
| Max SPI frequency | 104 MHz - reduces boot time and firmware update latency in real-time embedded applications. |
| Quad-I/O read speed | 70 MHz - doubles effective throughput vs standard SPI, critical for high-bandwidth configuration loading. |
| Page size | User-configurable 512 or 528 bytes - balances alignment efficiency with legacy DataFlash compatibility. |
| Endurance | 10,000 program/erase cycles at −40 °C to +105 °C - validated for extended operation in automotive under-hood and industrial control environments. |
| Data retention | 20 years - ensures long-term reliability of calibration data and field-upgradable firmware. |
| Power-down current | 500 nA ultra-deep power-down - extends battery life in always-on IoT edge nodes and portable diagnostics tools. |
Pinout & Package
AT45DQ321-MWHF2B-T uses an 8-pad Very-thin DFN package (6 mm × 8 mm × 1.0 mm), RoHS-compliant and halide-free, optimized for space-constrained industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable for SPI command decoding; must be asserted before SCK edge to initiate valid transactions. |
| SCK | Serial Clock | Input clock synchronizing all SPI transfers; supports up to 104 MHz for standard mode and 70 MHz for Quad-I/O. |
| MOSI | Master Out Slave In | Serial input for commands, addresses, and write data; supports single/dual/quad-input buffer writes per RapidS™ spec. |
| MISO | Master In Slave Out | Serial output for read data and status; supports single/dual/quad-output reads with opcode-dependent timing. |
| WP | Write Protect | Hardware-enabled sector lock-down control; low = enables protection, high = allows modification of protected sectors. |
| RESET | Hardware Reset | Asynchronous active-low reset that forces device into power-on state, clearing status flags and aborting ongoing operations. |
| VCC | Power Supply | 2.3–3.6 V supply input; decoupling capacitor required within 10 mm for stable high-frequency operation. |
| GND | Ground | Reference return path for all I/O and core logic; shared with thermal pad for thermal dissipation in VDFN package. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-SRAM buffering | Enables seamless background programming: receive new data into one buffer while erasing/rewriting the main array from the other. |
| RapidS™ high-speed read | Delivers up to 280 MB/s effective bandwidth in Quad-output mode (6Bh opcode), accelerating boot and config load times. |
| Configurable page size | Factory-set to 528 bytes by default; can be reconfigured to 512 bytes for strict legacy DataFlash alignment requirements. |
| 128-byte OTP security register | Contains 64-byte factory-unique ID + 64-byte user-programmable space - used for device authentication and secure key binding. |
| Program/erase suspend | Allows interruption of long erase cycles (e.g., sector erase) to service urgent read requests, minimizing system latency. |
| Individual sector lockdown | Once locked, a sector becomes permanently read-only - prevents accidental or malicious firmware corruption in safety-critical applications. |
Applications
| Industrial PLC Firmware Storage | Automotive ADAS Boot Memory |
|---|---|
Use Scenario: Storing and executing programmable logic controller firmware with field-upgrade capability and tamper-resistant configuration parameters. IC Role / Device Role / Timing Role: Primary non-volatile boot and application code storage with hardware write protection and sector lockdown for certified firmware integrity. Use Value: Ensures deterministic boot behavior and prevents unauthorized modification of safety-critical ladder logic through OTP-secured sector locking. | Use Scenario: Holding boot code and sensor calibration data for radar/EPS ECUs operating across −40 °C to +105 °C ambient conditions. IC Role / Device Role / Timing Role: High-reliability, temperature-qualified serial flash providing rapid boot initialization and secure parameter retention during vehicle cold starts. Use Value: Delivers 7 ns tV and 10,000-cycle endurance at +105 °C - meeting ASIL-B timing and longevity requirements for ADAS subsystems. |
| Medical Diagnostic Instrument Data Log | Smart Grid Edge Node Configuration |
Use Scenario: Capturing time-stamped diagnostic waveforms and calibration history in portable ultrasound and ECG devices with battery backup. IC Role / Device Role / Timing Role: Low-power non-volatile storage with ultra-deep power-down (500 nA) for extended standby between patient sessions. Use Value: Extends battery life >5 years in maintenance-free deployments while retaining 20-year data integrity for regulatory audit trails. | Use Scenario: Hosting encrypted firmware images and grid synchronization parameters in DIN-rail-mounted RTUs and PMUs exposed to wide thermal cycling. IC Role / Device Role / Timing Role: Industrial-grade serial flash supporting secure over-the-air updates via Quad-I/O and hardware-based sector protection against remote exploits. Use Value: Enables authenticated firmware rollbacks and atomic sector-level updates without risking partial corruption during power loss. |
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 density, 1.7–2.0 V supply, no extra buffer memory, lacks RapidS™ and dual-buffer architecture. | Lower voltage operation but no concurrent buffer/main memory access; limited to basic SPI and QPI modes. | Choose when ultra-low voltage (1.7 V) is mandatory and buffer-assisted programming is unnecessary. |
| Macronix MX25L3233F | 32 Mbit density, 2.7–3.6 V supply, no OTP register, no sector lockdown, only standard Quad SPI (no RapidS™). | Higher minimum voltage, no permanent read-only sector capability, reduced security feature set. | Choose for cost-sensitive industrial designs where OTP ID and hardware lockdown are not required. |
Compared with W25Q32JW and MX25L3233F, the AT45DQ321-MWHF2B-T uniquely combines dual-SRAM buffering, RapidS™ acceleration, factory-programmed OTP ID, and hardware-enforced sector lockdown - making it the only option qualified for safety-critical firmware storage requiring concurrent operation and permanent protection.
Availability
AT45DQ321-MWHF2B-T is available at Aetrix Electronics and suitable for industrial PLCs, automotive ADAS ECUs, medical diagnostic instruments, and smart grid edge nodes requiring stable component supply across extended temperature and long product lifecycles.
Supply support for AT45DQ321-MWHF2B-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 delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, and IoT applications.
The AT45DQ321-MWHF2B-T belongs to Renesas' DataFlash family - engineered specifically for robust, high-speed, secure serial code and data storage in mission-critical embedded systems.
FAQ
What is the operating temperature range supported by the AT45DQ321-MWHF2B-T?
The AT45DQ321-MWHF2B-T is rated for the full industrial temperature range of −40 °C to +105 °C, with validated endurance of 10,000 program/erase cycles and 20-year data retention across this range. This specification is confirmed in Table 42 of the official Renesas datasheet DS-AT45DQ321-031 Rev. H, making AT45DQ321-MWHF2B-T suitable for under-hood automotive and high-temperature industrial control applications.
Does the AT45DQ321-MWHF2B-T support true Quad-SPI (QSPI) protocol compliance?
The AT45DQ321-MWHF2B-T supports Quad-output and Quad-input operations using dedicated opcodes (6Bh for Quad-read, 34h for Quad-write), but it does not implement JEDEC-standard QSPI with wrap-around addressing or DDR mode. Its Quad-I/O mode delivers 70 MHz bandwidth and is optimized for RapidS™-enhanced throughput rather than generic QSPI controller compatibility. Refer to Section 5.1 and Table 30 in the AT45DQ321-MWHF2B-T datasheet for supported command mappings.
How is page size configured on the AT45DQ321-MWHF2B-T, and can it be changed in-system?
The AT45DQ321-MWHF2B-T supports both 512-byte and 528-byte page sizes. The default is 528 bytes; 512-byte mode is factory-configurable and cannot be altered in-system after shipment. Configuration is performed via the Buffer and Page Size Configuration command (Table 25), and the setting persists across power cycles. This fixed configuration ensures deterministic addressing behavior in production firmware.
What security features does the AT45DQ321-MWHF2B-T provide beyond standard write protection?
The AT45DQ321-MWHF2B-T provides three layered security features: (1) individual sector protection via software/hardware control, (2) permanent sector lockdown (once enabled, irreversible), and (3) a 128-byte OTP security register with 64-byte factory-unique ID and 64-byte user-programmable space. These features are documented in Sections 8–9 of the AT45DQ321-MWHF2B-T datasheet and enable cryptographic binding, secure boot verification, and tamper-proof firmware partitioning.
Is the AT45DQ321-MWHF2B-T pin-compatible with earlier AT45DB series devices?
No, the AT45DQ321-MWHF2B-T is not pin-compatible with AT45DB-series devices due to architectural differences including dual-buffer support, RapidS™ command extensions, and updated status/configuration register layouts. While both share the same 8-pin SOIC/DFN footprint, signal timing, opcode mapping, and internal state machine behavior differ significantly. Migration requires firmware and driver updates - confirmed in Renesas Application Note AN-1127 and the AT45DQ321-MWHF2B-T migration guide.
AT45DQ321-MWHF2B-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VDFN (6x8)
AT45DQ321-MWHF2B-T FAQ
1.How can I place an order for AT45DQ321-MWHF2B-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DQ321-MWHF2B-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-MWHF2B-T reliable?
The price and inventory of AT45DQ321-MWHF2B-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-MWHF2B-T is usually 5 days.
3.What payment methods are accepted for AT45DQ321-MWHF2B-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DQ321-MWHF2B-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DQ321-MWHF2B-T?
AT45DQ321-MWHF2B-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DQ321-MWHF2B-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-MWHF2B-T?
For technical support, including AT45DQ321-MWHF2B-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DQ321-MWHF2B-T requirements.
6.How does Aetrix verify that AT45DQ321-MWHF2B-T is sourced from the original manufacturer or authorized distributors?
All AT45DQ321-MWHF2B-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-MWHF2B-T meets industry standards.
7.What is the process for return or replacement of AT45DQ321-MWHF2B-T?
All AT45DQ321-MWHF2B-T units undergo pre-shipment inspection (PSI). If there is an issue with AT45DQ321-MWHF2B-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-MWHF2B-T part is unused and in its original packaging.
Return procedure for AT45DQ321-MWHF2B-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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