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Renesas AT45DQ321-SHFHB-B
- Part No.:
- AT45DQ321-SHFHB-B
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT45DQ321-SHFHB-B.pdf
- Description:
- IC FLASH 32MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,281
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Product details
Overview
AT45DQ321 from Renesas Electronics is a 32-Mbit SPI serial flash memory with 1-Mbit extra storage, 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 datasheet, AT45DQ321 pinout, AT45DQ321 application, or AT45DQ321 equivalent, this device delivers high-speed serial memory with hardware sector protection, OTP security register, ultra-deep power-down (500 nA), and JEDEC-standard ID read - critical for low-power, secure, and field-upgradable designs.
Technical Context
The AT45DQ321 implements a dual-buffered architecture with two independent 512/528-byte SRAM buffers, enabling concurrent buffer write while main memory reprogramming occurs. It supports SPI modes 0 and 3, RapidS™ high-frequency operation, and programmable I/O width (single/dual/quad) via configuration register and dedicated opcodes.
Its erase hierarchy includes page (512/528 B), block (4 kB), sector (64 kB), and chip (32 Mbit) levels, with suspend/resume capability for program/erase operations. Sector protection is enforced via hardware WP pin and software-controlled registers, including permanent lockdown of individual sectors using the 128-byte OTP security register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory density | 32 Mbit main array + 1 Mbit extra storage - supports firmware images and runtime data partitioning |
| 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 ~2× vs. standard 50 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 | 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 and IoT endpoints |
| Endurance | 100,000 program/erase cycles at -40°C to +85°C - suitable for frequent logging applications |
| Data retention | 20 years - ensures long-term reliability in unattended industrial deployments |
Pinout & Package
AT45DQ321 is offered 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 pinout is identical across all variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable for SPI command decoding; 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 mode |
| MOSI | Master Out, Slave In | Serial data input for commands, addresses, and write data; supports dual/quad-input buffering |
| MISO | Master In, Slave Out | Serial data output for reads; operates in single/dual/quad-output mode per configuration |
| WP | Write Protect | Hardware-enabled sector protection; low state locks protected sectors against accidental writes/erases |
| HOLD | Hold Input | Pauses ongoing serial transfer without deselecting chip; retains internal state during host interruption |
| VCC | Power Supply | 2.3–3.6 V supply; decoupling capacitor required within 10 mm of pin for stable high-frequency operation |
| GND | Ground | Reference for all I/O and internal circuitry; separate analog/digital ground not required |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent SRAM buffers | Enables seamless background programming: receive new data into one buffer while writing previous buffer to flash array |
| Program/Erase suspend/resume | Allows urgent read access or interrupt handling during long erase cycles without data corruption or timing loss |
| 128-byte OTP security register | Provides factory-programmed unique ID (64 B) and user-writable space (64 B) for device authentication and license binding |
| Hardware + software sector protection | Combines WP pin control with register-based locking to prevent unauthorized firmware modification in safety-critical systems |
| Ultra-deep power-down mode | Reduces current to 500 nA while preserving memory contents - ideal for energy-harvesting and battery-backed applications |
| JEDEC-standard Manufacturer/Device ID | Supports automated BOM verification and supply-chain traceability via opcode 9Fh read command |
Applications
| Firmware Storage | Secure Parameter Logging |
|---|---|
|
Use Scenario: Storing bootloader, application firmware, and configuration binaries in resource-constrained microcontroller-based edge devices. IC Role / Device Role / Timing Role: Non-volatile serial memory providing fast, reliable code execution from XIP-capable interfaces with Quad-I/O acceleration. Use Value: 104 MHz SPI and 70 MHz Quad-I/O reduce boot latency by >40% versus legacy 40 MHz SPI flash, improving system responsiveness. |
Use Scenario: Recording calibrated sensor offsets, calibration coefficients, and operational history in industrial sensors operating across -40°C to +105°C. IC Role / Device Role / Timing Role: High-endurance, temperature-rated serial flash with sector lock-down ensuring integrity of mission-critical calibration data. Use Value: 100,000 program/erase cycles at full industrial temp range and 20-year data retention guarantee long-term field accuracy. |
| Low-Power IoT Node Memory | Secure Boot Configuration Store |
|
Use Scenario: Persistent storage for network keys, device identity, and state variables in battery-powered wireless sensor nodes with multi-year lifetime targets. IC Role / Device Role / Timing Role: Ultra-low-power serial flash supporting deep-sleep wake-up sequences with sub-microamp quiescent current. Use Value: 500 nA ultra-deep power-down current minimizes battery drain during 99.9%+ sleep duty cycle, extending service intervals. |
Use Scenario: Holding immutable root-of-trust parameters, public key hashes, and secure boot policy flags in automotive ECUs and medical devices. IC Role / Device Role / Timing Role: Hardware-enforced read-only sector with OTP security register serving as tamper-resistant configuration vault. Use Value: Sector lockdown and 64-byte factory-unique ID enable cryptographic binding of firmware to hardware, preventing cloning or rollback attacks. |
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, no extra 1-Mbit memory, lacks dual-SRAM buffers and RapidS™ mode | Lower voltage operation but no concurrent buffer write; less suited for real-time logging with continuous writes | Select when ultra-low-voltage operation is mandatory and buffer concurrency is unnecessary |
| Macronix MX25L3233F | 32 Mbit, 2.7–3.6 V supply, supports Quad-I/O only, no configurable page size or OTP register | Higher minimum VCC excludes 2.3–2.6 V systems; missing sector lockdown limits security-critical use cases | Choose for cost-sensitive designs where 3.3 V rail is stable and advanced protection features are not required |
Compared with W25Q32JW and MX25L3233F, the AT45DQ321 uniquely combines 2.3 V operation, dual-SRAM buffers, OTP security register, and hardware/software sector protection - making it the only option among the three qualified for secure, low-voltage, real-time firmware and data logging in extended temperature environments.
Availability
AT45DQ321 is available at Aetrix Electronics and suitable for industrial control firmware storage, medical device parameter logging, and automotive telematics data buffering requiring stable component supply across extended temperature ranges and long production lifecycles.
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 infrastructure markets.
The AT45DQ321 belongs to Renesas' DataFlash® family, engineered specifically for high-reliability embedded systems requiring concurrent read/write, robust data protection, and ultra-low-power non-volatile storage.
FAQ
What is the maximum operating frequency of 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 AT45DQ321 achieves this performance while maintaining compatibility with standard SPI controllers via mode configuration, and the 7 ns max clock-to-output time ensures timing margin for high-speed PCB layouts.
Does the AT45DQ321 support true concurrent read and write operations?
Yes - the AT45DQ321 implements two fully independent 512/528-byte SRAM buffers, allowing simultaneous reception of new data into one buffer while programming the other buffer's contents into main memory. This concurrent operation is explicitly documented in the Features section (page 1) and Section 2.1 of the datasheet. The AT45DQ321 leverages this architecture to eliminate write stalls in real-time logging applications without external buffering logic.
How is sector protection implemented on the AT45DQ321?
The AT45DQ321 provides dual-layer sector protection: hardware-based via the WP pin (active-low, latching), and software-based via sector protection registers accessible through opcodes 32h/36h. Individual sectors can be permanently locked down using the OTP security register (opcode 77h), as detailed in Sections 8 and 9 of the datasheet. This layered approach ensures that the AT45DQ321 meets functional safety requirements for firmware integrity in industrial and automotive systems.
What package options are available for the AT45DQ321?
The AT45DQ321 is offered in three green, 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), per Ordering Information (Section 28) and Package Descriptions (Table 44). All variants share identical pinout and electrical specifications. The AT45DQ321-SHFHB-B specifically denotes the 8-pad Ultra-thin DFN (5 × 6 × 0.6 mm) variant with industrial temperature grade (-40°C to +85°C).
Can the AT45DQ321 operate below 2.7 V?
Yes - the AT45DQ321 is specified for 2.3 V minimum supply voltage across its full industrial temperature range (-40°C to +85°C), as stated in the Features section (page 1) and DC Characteristics (Table 39). This allows direct interfacing with 2.5 V microcontrollers and low-voltage FPGAs without level shifters. The AT45DQ321 maintains full functionality including Quad-I/O and RapidS™ operation down to 2.3 V, distinguishing it from many competing flash devices with 2.7 V minimum ratings.
AT45DQ321-SHFHB-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- -
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH - NOR (SLC)
- Memory Size:
- 32Mbit
- Memory Organization:
- 4M x 8
- Memory Interface:
- SPI - Quad I/O
- Clock Frequency:
- 104 MHz
- Write Cycle Time - Word, Page:
- -
- Access Time:
- -
- Voltage - Supply:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT45DQ321-SHFHB-B FAQ
1.How can I place an order for AT45DQ321-SHFHB-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DQ321-SHFHB-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-SHFHB-B reliable?
The price and inventory of AT45DQ321-SHFHB-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-SHFHB-B is usually 5 days.
3.What payment methods are accepted for AT45DQ321-SHFHB-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DQ321-SHFHB-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DQ321-SHFHB-B?
AT45DQ321-SHFHB-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DQ321-SHFHB-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-SHFHB-B?
For technical support, including AT45DQ321-SHFHB-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DQ321-SHFHB-B requirements.
6.How does Aetrix verify that AT45DQ321-SHFHB-B is sourced from the original manufacturer or authorized distributors?
All AT45DQ321-SHFHB-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-SHFHB-B meets industry standards.
7.What is the process for return or replacement of AT45DQ321-SHFHB-B?
All AT45DQ321-SHFHB-B units undergo pre-shipment inspection (PSI). If there is an issue with AT45DQ321-SHFHB-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-SHFHB-B part is unused and in its original packaging.
Return procedure for AT45DQ321-SHFHB-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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