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Renesas AT45DQ321-SHF2B-T
- Part No.:
- AT45DQ321-SHF2B-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT45DQ321-SHF2B-T.pdf
- Description:
- IC FLASH 32MBIT SPI 104MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,934
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Product details
Overview
AT45DQ321-SHF2B-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 real-time data logging.
For engineers reviewing the AT45DQ321-SHF2B-T datasheet, AT45DQ321-SHF2B-T pinout, AT45DQ321-SHF2B-T application, or AT45DQ321-SHF2B-T equivalent, key selection considerations include quad-mode timing compliance, sector lockdown security, ultra-deep power-down current (500 nA), and JEDEC-standard ID read capability.
Technical Context
The AT45DQ321-SHF2B-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.
Its memory organization includes page (512/528 B), block (4 kB), sector (64 kB), and chip-level erase options, with program/erase suspend/resume functionality and configurable sector protection via dedicated registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory density | 32 Mbit main array + 1 Mbit extra buffer space - supports firmware + runtime log storage in single device |
| Supply voltage | 2.3 V to 3.6 V - compatible with low-voltage industrial microcontrollers and PMIC rails |
| Max SPI frequency | 104 MHz - enables fast boot code fetch and high-throughput firmware updates |
| Quad-I/O read speed | 70 MHz - doubles bandwidth over standard SPI for streaming applications |
| Page size | User-configurable 512 or 528 bytes - balances alignment efficiency and overhead for embedded file systems |
| Ultra-deep power-down | 500 nA typical - extends battery life in always-on sensor nodes and edge devices |
| Endurance | 100,000 cycles at -40°C to +85°C - suitable for field-updatable industrial controllers |
| Data retention | 20 years - meets long-lifecycle requirements for infrastructure and medical equipment |
Pinout & Package
AT45DQ321-SHF2B-T uses an 8-pad Ultra-thin DFN package (5 mm × 6 mm × 0.6 mm), RoHS-compliant and optimized for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS# | Chip Select | Active-low enable for SPI command decoding; supports multi-device bus sharing |
| SCK | Serial Clock | Input clock synchronized to SPI mode 0/3; max 104 MHz operation |
| MOSI | Master Out Slave In | Serial input for commands, addresses, and data; supports dual/quad-input buffer writes |
| MISO | Master In Slave Out | Serial output for read data; supports dual/quad-output reads with 7 ns tV |
| WP# | Write Protect | Hardware lock for sector protection; active-low, tied to VCC or GND for permanent configuration |
| HOLD# | Hold Control | Pauses ongoing read/write without deselecting CS#; enables interrupt-safe access |
| VCC | Power Supply | 2.3–3.6 V supply; decoupling required per datasheet layout guidelines |
| GND | Ground | Reference return path; separate analog/digital grounding not required |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent SRAM buffers | Enables background programming: receive new data into one buffer while erasing/programming main array from the other |
| Program/Erase Suspend/Resume | Allows interruption of long erase cycles (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 | Per-sector write-lock that persists after power cycle - prevents accidental or malicious firmware overwrite |
| JEDEC Manufacturer/Device ID | Standardized 9Fh opcode read - simplifies automated BOM verification and supply-chain traceability |
| RapidS™ operation | Optimized timing for faster command execution and reduced latency in high-frequency SPI mode |
Applications
| Industrial PLC Firmware Storage | Medical Device Data Logger |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers operating across -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Nonvolatile firmware repository with rapid page rewrites and sector-level protection against field update corruption. Use Value: 100,000 program/erase cycles and 20-year data retention ensure reliability over 15+ year product lifecycles without replacement. | Use Scenario: Capturing timestamped patient vital signs in portable ECG monitors with limited battery capacity. IC Role / Device Role / Timing Role: Low-power sequential data logger using ultra-deep power-down (500 nA) between sampling intervals. Use Value: Dual-buffer operation allows continuous acquisition into one buffer while background-writing completed segments to main memory. |
| Automotive ADAS Boot Memory | Smart Grid Sensor Node |
Use Scenario: Holding boot code and calibration tables for camera-based driver assistance modules in engine compartments. IC Role / Device Role / Timing Role: High-reliability SPI flash with Quad-I/O read (70 MHz) for sub-100 ms boot time and hardware WP#-enabled protection. Use Value: Sector lockdown prevents unauthorized modification of safety-critical calibration data during vehicle service or OTA updates. | Use Scenario: Recording grid voltage/current harmonics in distributed transformer monitoring units powered by energy harvesting. IC Role / Device Role / Timing Role: Energy-efficient storage with Deep Power-Down (3 µA) and configurable 512-byte pages for compact packetized logging. Use Value: JEDEC ID read and RapidS™ support simplify integration with ARM Cortex-M33-based telemetry SoCs using standard HAL drivers. |
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, Quad SPI only (no Dual-I/O), no SRAM buffers | Lacks concurrent buffer/main memory operation; requires external buffering logic for streaming | Preferred where ultra-low voltage operation is mandatory and buffer concurrency is unnecessary |
| Macronix MX25L3233F | 32 Mbit, 2.7–3.6 V supply, no OTP register, no sector lockdown, 10,000-cycle endurance at +105°C | No hardware-enforced permanent read-only sectors; lower high-temp endurance than AT45DQ321-SHF2B-T | Selected when cost sensitivity outweighs security and extended temperature robustness requirements |
Compared with W25Q32JW and MX25L3233F, the AT45DQ321-SHF2B-T uniquely delivers dual-SRAM buffering, factory-programmed UID, and sector lockdown - critical for secure, real-time embedded logging where data integrity and lifecycle assurance are non-negotiable.
Availability
AT45DQ321-SHF2B-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device data logging, automotive ADAS boot memory, and smart grid sensor node applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT45DQ321-SHF2B-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 specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and enterprise applications.
The AT45DQ321-SHF2B-T belongs to Renesas' DataFlash® family, engineered for high-reliability embedded systems requiring concurrent read/write, advanced security, and ultra-low-power operation in harsh environments.
FAQ
What is the operating temperature range for the AT45DQ321-SHF2B-T?
The AT45DQ321-SHF2B-T is rated for the full industrial temperature range of -40°C to +85°C, with extended characterization up to +105°C. At +105°C, endurance is specified at 10,000 program/erase cycles and data retention remains 20 years. This makes the AT45DQ321-SHF2B-T suitable for under-hood automotive and industrial control applications where thermal stability is critical.
Does the AT45DQ321-SHF2B-T support Quad-I/O read commands?
Yes, the AT45DQ321-SHF2B-T supports Quad-output Read Array using opcode 6Bh, achieving up to 70 MHz operation. It also supports Dual-output Read (3Bh), Quad-input Buffer Write (E7h), and Dual-input Buffer Write (A7h). Quad mode must be explicitly enabled via the Configuration Register; default state is standard SPI.
How does the dual-SRAM buffer architecture benefit system design?
The AT45DQ321-SHF2B-T integrates two independent 512/528-byte SRAM buffers, allowing simultaneous reception of new data into one buffer while reprogramming the main memory array from the other. This eliminates write-blocking during firmware updates or data logging, improving real-time responsiveness in resource-constrained microcontroller systems.
Can the AT45DQ321-SHF2B-T be used as a direct replacement for legacy AT45DB321 devices?
No - the AT45DQ321-SHF2B-T is not pin-compatible or functionally identical to the AT45DB321. It introduces Quad-I/O support, RapidS™ timing, updated command set (e.g., 6Bh/3Bh reads), and enhanced security features. Migration requires firmware revision, timing validation, and layout review; it is not a drop-in replacement.
What security mechanisms does the AT45DQ321-SHF2B-T provide beyond basic write protection?
Beyond WP# pin control, the AT45DQ321-SHF2B-T provides software-configurable sector protection, permanent sector lockdown (irreversible read-only lock), and a 128-byte OTP Security Register with 64-byte factory-unique ID. These features enable layered security: temporary lock (sector protect), permanent lock (lockdown), and cryptographic binding (OTP UID).
AT45DQ321-SHF2B-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- 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-SOIC
AT45DQ321-SHF2B-T FAQ
1.How can I place an order for AT45DQ321-SHF2B-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DQ321-SHF2B-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-SHF2B-T reliable?
The price and inventory of AT45DQ321-SHF2B-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-SHF2B-T is usually 5 days.
3.What payment methods are accepted for AT45DQ321-SHF2B-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DQ321-SHF2B-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DQ321-SHF2B-T?
AT45DQ321-SHF2B-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DQ321-SHF2B-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-SHF2B-T?
For technical support, including AT45DQ321-SHF2B-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DQ321-SHF2B-T requirements.
6.How does Aetrix verify that AT45DQ321-SHF2B-T is sourced from the original manufacturer or authorized distributors?
All AT45DQ321-SHF2B-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-SHF2B-T meets industry standards.
7.What is the process for return or replacement of AT45DQ321-SHF2B-T?
All AT45DQ321-SHF2B-T units undergo pre-shipment inspection (PSI). If there is an issue with AT45DQ321-SHF2B-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-SHF2B-T part is unused and in its original packaging.
Return procedure for AT45DQ321-SHF2B-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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