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Renesas AT45DQ321-SHD2B-T
- Part No.:
- AT45DQ321-SHD2B-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT45DQ321-SHD2B-T.pdf
- Description:
- IC FLASH 32MBIT SPI 104MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,848
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Product details
Overview
AT45DQ321-SHD2B-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 clock-to-output time, and configurable 512/528-byte page size - deployed in industrial embedded systems for firmware storage and data logging.
For engineers reviewing the AT45DQ321-SHD2B-T datasheet, AT45DQ321-SHD2B-T pinout, AT45DQ321-SHD2B-T application, or AT45DQ321-SHD2B-T equivalent, key selection criteria include quad-mode timing compliance, ultra-deep power-down current (500 nA), sector lockdown security, JEDEC ID compatibility, and SOIC-8 package mechanical fit.
Technical Context
The AT45DQ321-SHD2B-T implements a dual-SRAM-buffer architecture (512/528 bytes each) enabling concurrent buffer write and main memory reprogramming. It supports SPI modes 0 and 3, RapidS™ high-speed operation, and hardware/software reset control with status register monitoring.
Its memory organization includes 64 sectors (64 kB each), 1024 blocks (4 kB each), and page-level granularity (512 or 528 bytes). Erase suspend/resume, individual sector protection, and OTP security register (128 bytes, 64 factory-programmed) are integrated at silicon level.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory density | 32 Mbit main array + 1 Mbit extra buffer space - supports firmware image storage plus runtime parameter logging in same device. |
| 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 frequency | 104 MHz - reduces firmware update time by ~3× vs. standard 33 MHz SPI flash in legacy boot loaders. |
| Dual/Quad I/O speed | 70 MHz - doubles/quadruples effective throughput over single-I/O mode for high-bandwidth data streaming. |
| Page size | User-configurable 512 or 528 bytes - matches common MCU DMA burst sizes and avoids internal padding overhead. |
| Power-down current | 500 nA ultra-deep mode - extends battery life in always-on sensor nodes beyond 10 years at 1 µA system sleep budget. |
| Endurance | 100,000 program/erase cycles (–40 °C to +85 °C) - supports daily firmware updates for >270 years in industrial gateways. |
| Data retention | 20 years - meets long-life requirements for medical devices and infrastructure controllers with no field refresh needed. |
Pinout & Package
AT45DQ321-SHD2B-T uses an 8-lead SOIC (0.208" wide) package per ordering code SHD2B-T, compliant with JEDEC MS-012AC. Pin functions are electrically and mechanically defined for standard SPI bus routing.
| 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 with 7 ns tV for timing-critical boot sequences. |
| MOSI | Master Out Slave In | Single-line input for command opcodes, addresses, and data during standard/Dual-input/Quad-input writes. |
| MISO | Master In Slave Out | Single-line output for status reads, buffer contents, and array data in legacy mode; supports Dual/Quad-output in high-speed modes. |
| WP | Write Protect | Hardware sector lock control; when low, prevents program/erase of protected sectors independent of software commands. |
| HOLD | Pause Transfer | Halts ongoing SPI transaction without CS deassertion - enables multi-master arbitration or low-latency interrupt handling. |
| VCC | Power Supply | 2.3–3.6 V supply; decoupling capacitor required within 5 mm for stable 104 MHz operation. |
| GND | Ground | Reference for all I/O and internal logic; separate analog/digital ground not required due to integrated noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-SRAM buffers | Enables seamless background programming: receive new firmware into Buffer 1 while executing from main array or reading from Buffer 2. |
| Quad-output read (6Bh) | Delivers 4-bit-per-clock data transfer, achieving 280 MB/s effective bandwidth at 70 MHz - critical for real-time waveform capture buffers. |
| Individual sector lockdown | Permanently disables erase/write on selected 64 kB sectors via OTP fuse; prevents accidental or malicious corruption of bootloader or calibration tables. |
| RapidS™ operation | Reduces instruction latency by eliminating dummy cycles in high-frequency read modes - cuts boot time by 15–20% in Cortex-M7-based edge AI modules. |
| Ultra-deep power-down (500 nA) | Enters sub-µA state in <10 µs; ideal for wake-on-event architectures where flash remains powered but inactive for >99.9% of system uptime. |
| JEDEC Manufacturer ID (0x1F) | Enables automatic device detection in generic flash drivers - eliminates hardcoded vendor IDs in BSP layers for scalable multi-platform firmware. |
Applications
| Industrial PLC Firmware Storage | Medical Sensor Data Logger |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in DIN-rail mounted programmable logic controllers operating continuously in factory environments. IC Role / Device Role / Timing Role: Non-volatile firmware repository with atomic page updates and sector lockdown to prevent corruption during brown-out events. Use Value: 100,000-cycle endurance ensures >27 years of daily firmware patches; 20-year data retention eliminates scheduled flash replacement in installed base. | Use Scenario: Capturing high-resolution ECG waveforms at 1 kSPS for 72-hour continuous monitoring in portable diagnostic devices. IC Role / Device Role / Timing Role: High-throughput sequential data sink using Quad-output read and Dual-input write to sustain 280 MB/s burst writes without CPU intervention. Use Value: 500 nA ultra-deep power-down extends single-CR2032 battery life to >14 months; 528-byte page alignment matches ADC DMA buffer depth. |
| Automotive Telematics Bootloader | Smart Meter Firmware Vault |
Use Scenario: Securing OTA update images and cryptographic keys in LTE-connected vehicle telematics control units (TCUs) certified to AEC-Q100 Grade 2. IC Role / Device Role / Timing Role: Trusted execution environment extension providing tamper-resistant storage for signed firmware signatures and root-of-trust keys. Use Value: 128-byte OTP security register stores unique device ID and user-defined keys; sector lockdown prevents rollback attacks on bootloader partition. | Use Scenario: Archiving utility meter firmware revisions and tariff tables across 15+ year field deployments under ANSI C12.22 and DLMS/COSEM protocols. IC Role / Device Role / Timing Role: Long-life configuration vault with hardware write protection (WP pin) and software sector locks to enforce regulatory compliance and audit trails. Use Value: Green RoHS-compliant SOIC-8 package withstands reflow and thermal cycling; 105 °C rating supports operation inside sealed outdoor meter enclosures. |
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, Quad SPI only (no Dual-I/O), 133 MHz max clock, no SRAM buffers | Lacks concurrent buffer/main memory operation; requires external buffering for overlap use cases | Select when highest clock speed is prioritized over background programming capability |
| Macronix MX25L3233F | 32 Mbit, 2.7–3.6 V supply, supports Dual/Quad I/O, 104 MHz SPI, no OTP security register or sector lockdown | No hardware-enforced permanent sector protection; relies on software-only locking schemes | Select when cost sensitivity outweighs need for immutable bootloader partitioning |
Compared with W25Q32JW and MX25L3233F, the AT45DQ321-SHD2B-T uniquely combines dual-SRAM buffering, OTP-based sector lockdown, and 2.3 V minimum operation - making it the only option among the three qualified for safety-critical firmware vaulting in extended temperature industrial designs.
Availability
AT45DQ321-SHD2B-T is available at Aetrix Electronics and suitable for industrial PLCs, portable medical diagnostics, automotive telematics units, and smart utility meters requiring stable component supply across 10+ year product lifecycles.
Supply support for AT45DQ321-SHD2B-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 belongs to Renesas' DataFlash® family, engineered specifically for reliable, high-speed, secure non-volatile storage in resource-constrained embedded systems where firmware integrity and long-term data retention are mission-critical.
FAQ
What is the operating temperature range supported by the AT45DQ321-SHD2B-T?
The AT45DQ321-SHD2B-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-SHD2B-T suitable for deployment in harsh environments such as factory automation cabinets and outdoor smart meter installations where ambient temperatures exceed standard industrial limits.
Does the AT45DQ321-SHD2B-T support both SPI mode 0 and mode 3?
Yes, the AT45DQ321-SHD2B-T explicitly supports SPI modes 0 and 3 as defined by CPOL and CPHA settings. This dual-mode compatibility allows direct integration with diverse host processors - including ARM Cortex-M series and RISC-V SoCs - without requiring custom SPI controller configuration or bit-banging workarounds in the AT45DQ321-SHD2B-T driver layer.
How does the page size configuration work on the AT45DQ321-SHD2B-T?
The AT45DQ321-SHD2B-T supports two page sizes: 512 bytes (factory-configurable) and 528 bytes (default). Configuration is performed via the Buffer and Page Size Configuration command (0x3D), and the setting persists across power cycles. The AT45DQ321-SHD2B-T's flexibility allows alignment with MCU DMA engines optimized for either size - avoiding wasted buffer space or split-page writes that degrade write efficiency.
Can the AT45DQ321-SHD2B-T be used in place of legacy AT45DB series devices?
The AT45DQ321-SHD2B-T is not a pin-compatible or functional drop-in replacement for AT45DB-series parts due to differences in command set, buffer architecture, and Quad-I/O enable sequence. While both share DataFlash heritage, the AT45DQ321-SHD2B-T introduces RapidS™ timing, enhanced security registers, and updated erase suspend behavior - requiring firmware driver updates for migration from AT45DB devices.
What security mechanisms does the AT45DQ321-SHD2B-T provide for firmware protection?
The AT45DQ321-SHD2B-T provides hardware-enforced security via individual sector protection, permanent sector lockdown (OTP-fused), and a 128-byte OTP security register containing 64 bytes of factory-unique ID and 64 bytes of user-programmable keys. These features operate independently of host software, ensuring that even if the MCU is compromised, bootloader or calibration sectors remain immutable - a core requirement verified in the AT45DQ321-SHD2B-T's design for IEC 62443-aligned systems.
AT45DQ321-SHD2B-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- 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-SOIC
AT45DQ321-SHD2B-T FAQ
1.How can I place an order for AT45DQ321-SHD2B-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DQ321-SHD2B-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-SHD2B-T reliable?
The price and inventory of AT45DQ321-SHD2B-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-SHD2B-T is usually 5 days.
3.What payment methods are accepted for AT45DQ321-SHD2B-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DQ321-SHD2B-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DQ321-SHD2B-T?
AT45DQ321-SHD2B-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DQ321-SHD2B-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-SHD2B-T?
For technical support, including AT45DQ321-SHD2B-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DQ321-SHD2B-T requirements.
6.How does Aetrix verify that AT45DQ321-SHD2B-T is sourced from the original manufacturer or authorized distributors?
All AT45DQ321-SHD2B-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-SHD2B-T meets industry standards.
7.What is the process for return or replacement of AT45DQ321-SHD2B-T?
All AT45DQ321-SHD2B-T units undergo pre-shipment inspection (PSI). If there is an issue with AT45DQ321-SHD2B-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-SHD2B-T part is unused and in its original packaging.
Return procedure for AT45DQ321-SHD2B-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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