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Renesas AT45DQ321-SHF-B
- Part No.:
- AT45DQ321-SHF-B
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT45DQ321-SHF-B.pdf
- Description:
- IC FLASH 32MBIT SPI 104MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:42,575
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Product details
Overview
AT45DQ321 from Renesas Electronics is a 32-Mbit SPI serial flash memory with integrated 1-Mbit extra storage, 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 datasheet, AT45DQ321 pinout, AT45DQ321 application, or AT45DQ321 equivalent, key selection criteria include quad-mode timing compliance, ultra-deep power-down current (500 nA), sector lockdown security, buffer-to-main-memory program suspend/resume capability, and JEDEC-standard ID read support.
Technical Context
The AT45DQ321 implements a dual-SRAM-buffer architecture (512/528 bytes each) enabling concurrent data reception and main array reprogramming. It supports SPI modes 0 and 3, RapidS™ high-speed operation, and hardware/software reset control.
Its memory organization includes 4-kB blocks, 64-kB sectors, and full-chip erase capability. Page size is factory-configurable (512 or 528 bytes), and the device features dedicated status/configuration registers, OTP security register (128 bytes), and programmable sector protection with permanent lockdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory density | 32 Mbit main + 1 Mbit extra storage - supports separate firmware and calibration data partitions |
| 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 by >3× vs. standard 33 MHz SPI flash |
| Quad-I/O read speed | 70 MHz - delivers up to 280 MB/s effective throughput for high-bandwidth boot code access |
| Page size options | 512 or 528 bytes - 528-byte default aligns with legacy DataFlash compatibility; 512-byte mode simplifies address mapping |
| Ultra-deep power-down | 500 nA typical - extends battery life in always-on sensor nodes and energy-harvesting devices |
| Endurance | 100,000 cycles at -40°C to +85°C - suitable for field-updatable industrial controllers with frequent log writes |
| Data retention | 20 years - ensures long-term reliability in unattended infrastructure monitoring equipment |
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). The SOIC variant is designated by suffix "-SHF-B".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable for SPI command execution; must be deasserted between commands to avoid bus contention |
| SCK | Serial Clock | Input clock synchronizing all SPI transfers; supports up to 104 MHz for single-I/O and 70 MHz for quad-I/O modes |
| MOSI | Master Out Slave In | Serial data input for commands, addresses, and write data; supports dual/quad-input buffer write via opcode extension |
| MISO | Master In Slave Out | Serial data output for reads; supports dual/quad-output read using 3Bh/6Bh opcodes |
| WP | Write Protect | Hardware sector lock control; low = enables software protection; high = freezes protection state permanently |
| RESET | Hardware Reset | Active-low asynchronous reset; returns device to power-on state and clears status register flags |
| HOLD | Hold Function | Pauses ongoing read/write without deselecting CS; essential for multi-master or interrupt-driven host systems |
| VCC / GND | Power / Ground | Single 2.3–3.6 V supply; decoupling capacitor required within 10 mm of pins per datasheet layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent SRAM buffers | Enables seamless background programming: host writes to one buffer while second buffer contents are written to flash array |
| Program/Erase Suspend/Resume | Allows immediate interruption of long erase (e.g., 64 kB sector) to service time-critical reads or writes |
| 128-byte OTP Security Register | 64-byte factory-unique ID + 64-byte user-programmable space - supports secure boot key binding and device authentication |
| Individual sector lockdown | Once locked, sector becomes permanently read-only; prevents accidental or malicious firmware overwrite in safety-critical applications |
| RapidS™ high-frequency mode | Reduces instruction latency and improves throughput in continuous-array read operations using 0Bh/1Bh opcodes |
| JEDEC Manufacturer/Device ID | Standardized 9Fh opcode returns consistent 0x1F 0x89 identification - simplifies automated BOM verification and supplier audits |
Applications
| Industrial PLC Firmware Storage | Medical Device Calibration Data Logging |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Non-volatile firmware repository with fast quad-read access for deterministic boot timing and buffer-suspended updates during runtime. Use Value: 100,000-cycle endurance and 20-year data retention ensure reliable field upgrades over 15+ year product lifecycles without recalibration. | Use Scenario: Recording patient-specific calibration coefficients and usage logs in portable ultrasound and infusion pumps. IC Role / Device Role / Timing Role: Secure, tamper-resistant parameter store using OTP security register and sector lockdown to meet IEC 62304 Class C requirements. Use Value: 500 nA ultra-deep power-down current extends battery life in handheld devices requiring >72-hour standby between charges. |
| Automotive ADAS Sensor Configuration | Smart Grid Meter Firmware Backup |
Use Scenario: Holding camera/LiDAR sensor configuration profiles and real-time correction tables in automotive advanced driver assistance systems. IC Role / Device Role / Timing Role: High-speed Quad-I/O interface delivers sub-100 µs configuration load times during cold boot, meeting ASIL-B timing constraints. Use Value: 70 MHz quad-read performance and 7 ns tV enable deterministic sensor initialization under ISO 16750-2 temperature cycling (-40°C to +105°C). | Use Scenario: Providing redundant firmware image storage and event-log history in ANSI C12.22-compliant smart electricity meters. IC Role / Device Role / Timing Role: Dual-buffer architecture allows simultaneous firmware validation (buffer read) and safe rollback (page program) without system interruption. Use Value: Sector-level protection and chip-erase isolation prevent corruption of critical metering algorithms during OTA updates across utility-wide deployments. |
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, 133 MHz max clock, no dual-SRAM buffers or RapidS™ mode | Lacks buffer-to-flash suspend/resume and factory-configurable page size; uses standard SFDP-based quad-enable flow | Preferred where higher clock rate is critical but concurrent buffer operation is unnecessary |
| Macronix MX25L3233F | 32 Mbit, 2.3–3.6 V, 104 MHz SPI, supports QPI/DTR but no built-in OTP register or sector lockdown | Offers quad-peripheral interface (QPI) and DTR mode but lacks 128-byte OTP security register and permanent sector lock-down feature | Chosen when QPI protocol compatibility is required and cryptographic binding is handled externally |
Compared with W25Q32JW and MX25L3233F, the AT45DQ321 uniquely integrates dual-SRAM buffers with suspend/resume, factory-programmable page size, and hardware-enforced sector lockdown - making it optimal for safety-certified, field-upgradable embedded systems requiring both performance and security assurance.
Availability
AT45DQ321 is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, automotive ADAS modules, and smart grid infrastructure requiring stable component supply across extended temperature and lifecycle demands.
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 high-reliability embedded systems requiring robust firmware storage, secure parameter logging, and deterministic update behavior under thermal stress and power variation.
FAQ
What is the maximum clock frequency supported by the AT45DQ321 in Quad-I/O mode?
The AT45DQ321 supports up to 70 MHz in Quad-I/O read mode, delivering up to 280 MB/s effective throughput. This is confirmed in the AC Characteristics table (Table 41) of the DS-AT45DQ321-031 Rev. H datasheet. The 70 MHz limit applies specifically to 6Bh opcode quad-output reads; SPI single-I/O mode supports up to 104 MHz. The AT45DQ321 maintains this timing across its full industrial temperature range (-40°C to +105°C).
Does the AT45DQ321 support hardware write protection at the sector level?
Yes, the AT45DQ321 supports hardware-assisted sector protection via the WP pin and internal Sector Protection Register. When WP is held high during power-up, sector protection bits become read-only; asserting WP low enables software configuration. Permanent lockdown is achieved using the Sector Lockdown Register (35h opcode), which - once set - makes selected sectors irreversibly read-only. This behavior is documented in Sections 8.2 and 9.1 of the AT45DQ321 datasheet.
Can the AT45DQ321 be used as a drop-in replacement for legacy AT45DB321 devices?
No, the AT45DQ321 is not a pin-compatible or functional drop-in replacement for the AT45DB321. While both are 32-Mbit DataFlash devices, the AT45DQ321 introduces Quad-I/O support, RapidS™ mode, updated command opcodes (e.g., 6Bh for quad read), and revised buffer management logic. Command sequences, status register bit definitions, and timing parameters differ significantly. Migration requires firmware revision and validation per DS-AT45DQ321-031 Section 15 (Operation Mode Summary).
What is the purpose of the 128-byte OTP Security Register in the AT45DQ321?
The 128-byte OTP Security Register in the AT45DQ321 provides 64 bytes of factory-programmed unique identifier (e.g., serial number) and 64 bytes of user-programmable space. It supports secure boot key binding, device authentication, and anti-cloning measures. Once programmed, OTP bytes cannot be erased or rewritten - a requirement verified in Section 9.2 of the AT45DQ321 datasheet. This register is accessed via 77h opcode and operates independently of main memory erase cycles.
How does the AT45DQ321 handle power-loss during a page program operation?
The AT45DQ321 incorporates on-die error detection and automatic recovery for interrupted page programs. If power fails mid-program, the internal state machine rolls back to a known-good state upon next power-up; no partial writes occur. The device reports status via the Status Register (D7h opcode), where bit 0 indicates "Ready/Busy" and bit 1 reflects "Erase/Program Error." This behavior is defined in Tables 20–21 and Section 7.4–7.7 of the AT45DQ321 datasheet, ensuring data integrity without host-side wear-leveling overhead.
AT45DQ321-SHF-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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-SOIC
AT45DQ321-SHF-B FAQ
1.How can I place an order for AT45DQ321-SHF-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DQ321-SHF-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 AT45DQ321-SHF-B reliable?
The price and inventory of AT45DQ321-SHF-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DQ321-SHF-B is usually 5 days.
3.What payment methods are accepted for AT45DQ321-SHF-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DQ321-SHF-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DQ321-SHF-B?
AT45DQ321-SHF-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DQ321-SHF-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 AT45DQ321-SHF-B?
For technical support, including AT45DQ321-SHF-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DQ321-SHF-B requirements.
6.How does Aetrix verify that AT45DQ321-SHF-B is sourced from the original manufacturer or authorized distributors?
All AT45DQ321-SHF-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 AT45DQ321-SHF-B meets industry standards.
7.What is the process for return or replacement of AT45DQ321-SHF-B?
All AT45DQ321-SHF-B units undergo pre-shipment inspection (PSI). If there is an issue with AT45DQ321-SHF-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 AT45DQ321-SHF-B part is unused and in its original packaging.
Return procedure for AT45DQ321-SHF-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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