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Renesas AT45DQ321-SHFHB-T
- Part No.:
- AT45DQ321-SHFHB-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT45DQ321-SHFHB-T.pdf
- Description:
- IC FLASH 32MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,897
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Product details
Overview
AT45DQ321-SHFHB-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 real-time data logging.
For engineers reviewing the AT45DQ321-SHFHB-T datasheet, AT45DQ321-SHFHB-T pinout, AT45DQ321-SHFHB-T application, or AT45DQ321-SHFHB-T equivalent, key selection criteria include quad-mode throughput, ultra-deep power-down current (500 nA), sector lockdown security, JEDEC ID compatibility, and SOIC-8 package suitability for space-constrained PCBs.
Technical Context
The AT45DQ321-SHFHB-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 dedicated /RESET pin logic.
Its memory organization includes 64 sectors (64 kB each), 1024 blocks (4 kB each), and 8192 pages (512/528 bytes), with independent erase granularity (page/block/sector/chip) and suspend/resume capability during program/erase cycles.
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 without external RAM. |
| Supply Voltage | 2.3 V to 3.6 V - enables direct interface with 2.5 V/3.3 V microcontrollers and low-voltage industrial SoCs. |
| Max SPI Clock | 104 MHz - delivers up to 104 MB/s sequential read bandwidth in single-I/O mode for fast boot loading. |
| Dual/Quad I/O Speed | 70 MHz - achieves 140 MB/s (Dual) or 280 MB/s (Quad) effective throughput for high-bandwidth data streaming. |
| Page Size | User-configurable 512 or 528 bytes - aligns with legacy DataFlash systems (528) or optimizes for binary-aligned firmware partitions (512). |
| Power-Down Current | 500 nA ultra-deep power-down - extends battery life in always-on IoT edge nodes with infrequent flash access. |
| Endurance | 100,000 program/erase cycles at -40°C to +85°C - suitable for field-upgradable devices requiring frequent OTA updates. |
| Data Retention | 20 years - ensures long-term reliability of stored calibration data, device identity, and configuration parameters. |
Pinout & Package
AT45DQ321-SHFHB-T uses an 8-lead SOIC (0.208" wide) package per ordering code SHFHB-T, with gull-wing leads, RoHS-compliant finish, and industrial-grade thermal performance (-40°C to +105°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| /CS | Chip Select | Active-low enable for SPI command decoding; must be held low for entire command sequence including address and data phases. |
| CLK | Clock Input | Synchronizes all SPI transfers; supports up to 104 MHz with tight tV ≤ 7 ns clock-to-output timing. |
| MOSI | Master Out, Slave In | Serial input for commands, addresses, and write data; supports standard, dual-input, and quad-input buffer write modes. |
| MISO | Master In, Slave Out | Serial output for read data; supports continuous array, page, buffer, dual-output, and quad-output read opcodes. |
| /WP | Write Protect | Hardware-enabled sector protection; when low, prevents program/erase of protected sectors per Sector Protection Register settings. |
| /RESET | Hardware Reset | Asynchronous active-low reset that forces device into power-on state, clearing status register and aborting ongoing operations. |
| HOLD | Hold Control | Pauses ongoing SPI transfer without deselecting chip; allows host to service higher-priority interrupts mid-command. |
| VCC | Power Supply | 2.3–3.6 V supply; decoupling capacitor required within 10 mm of pin to maintain signal integrity at 104 MHz operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM buffers | Enables simultaneous receive-to-buffer and buffer-to-flash programming - eliminates write latency bottlenecks in real-time logging applications. |
| Quad-output read | Delivers 280 MB/s effective bandwidth using 6Bh opcode - accelerates firmware decompression and OTA patch application. |
| One-Time Programmable (OTP) register | 128-byte security register with 64-byte factory-unique ID and 64-byte user-programmable space - supports secure device authentication and license binding. |
| Sector lockdown | Hardware-permanent read-only lock for any sector via 35h/36h commands - prevents accidental or malicious overwrite of bootloader or calibration tables. |
| Program/erase suspend | Allows interruption of long-duration erase (e.g., sector/64 kB) to service time-critical reads or writes - essential for deterministic real-time response. |
| Ultra-deep power-down | 500 nA standby current with full state retention - ideal for battery-powered sensors with multi-year deployment requirements. |
Applications
| Firmware Storage | Data Logging |
|---|---|
Use Scenario: Storing MCU boot images, application binaries, and configuration files in industrial PLCs and motor drives. IC Role / Device Role / Timing Role: Nonvolatile firmware repository with rapid sequential read and robust write endurance. Use Value: Enables field-upgradable firmware via SPI without external memory controllers; 100K-cycle endurance supports >5 years of quarterly updates. | Use Scenario: Capturing sensor readings, error logs, and operational timestamps in battery-powered environmental monitors. IC Role / Device Role / Timing Role: High-reliability circular buffer with atomic page writes and low-power deep-sleep modes. Use Value: 500 nA ultra-deep power-down extends 10-year battery life; dual-buffer architecture allows logging during flash reprogramming. |
| Secure Bootloader | OTA Update Cache |
Use Scenario: Hosting immutable bootloader code and cryptographic keys in medical diagnostic equipment. IC Role / Device Role / Timing Role: Tamper-resistant storage with sector lockdown and OTP security register. Use Value: Prevents unauthorized modification of boot code; factory-programmed 64-byte UID enables device-specific key derivation. | Use Scenario: Caching downloaded firmware patches before validation and installation in smart metering gateways. IC Role / Device Role / Timing Role: High-throughput temporary storage supporting quad-I/O burst reads and rapid buffer-to-memory transfers. Use Value: 70 MHz Quad-I/O read speed reduces patch apply time by 65% vs. standard SPI; auto-page rewrite simplifies update sequencing. |
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, 1.65–3.6 V supply, 133 MHz max clock, no dual/quad buffer write support, lacks OTP register and sector lockdown. | Better raw speed but weaker security and no concurrent buffer operation - suited for cost-sensitive consumer firmware storage. | Select W25Q32JW only if quad-read speed is primary requirement and security/buffer concurrency are not needed. |
| Macronix MX25L3233F | 32 Mbit density, 2.7–3.6 V supply, 104 MHz clock, supports QPI mode but no RapidS™ or configurable page size; no ultra-deep power-down (3 µA min). | Higher voltage floor limits use with 2.5 V systems; lacks 500 nA power-down and OTP - fits industrial controllers with stable 3.3 V rails. | Choose MX25L3233F when operating exclusively at 3.3 V and ultra-low-power sleep is not required. |
Compared with W25Q32JW and MX25L3233F, AT45DQ321-SHFHB-T uniquely combines ultra-low-power deep-sleep (500 nA), dual-SRAM buffering, factory-unique OTP ID, and hardware sector lockdown - making it optimal for secure, battery-operated, field-upgradable embedded systems where data integrity and power efficiency are critical.
Availability
AT45DQ321-SHFHB-T is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and battery-powered IoT edge nodes requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AT45DQ321-SHFHB-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 automotive, industrial, and enterprise applications.
The AT45DQ321-SHFHB-T belongs to Renesas' DataFlash® family, designed specifically for reliable, high-endurance, low-power serial flash storage in mission-critical embedded systems demanding security, flexibility, and long-term availability.
FAQ
What is the operating temperature range for AT45DQ321-SHFHB-T?
The AT45DQ321-SHFHB-T is rated for the full industrial temperature range of -40°C to +105°C, validated per JEDEC JESD22-A104 and JESD22-A108 standards. This rating applies to all electrical specifications including 100,000 program/erase cycles and 500 nA ultra-deep power-down current, making AT45DQ321-SHFHB-T suitable for under-hood automotive modules and factory-floor controllers.
Does AT45DQ321-SHFHB-T support true quad-SPI (QSPI) protocol?
No, AT45DQ321-SHFHB-T does not implement the JEDEC-standard QSPI protocol with its dedicated instruction set and wrap-around addressing. Instead, it supports quad-output read (6Bh) and quad-input buffer write (EBh) using standard SPI opcodes - delivering quad-data-lane throughput without requiring QSPI controller hardware, maintaining compatibility with legacy SPI peripherals.
How is page size configured on AT45DQ321-SHFHB-T?
Page size on AT45DQ321-SHFHB-T is factory-configured to 528 bytes by default but can be permanently set to 512 bytes using the Buffer Write and Configuration Register Write commands (per Table 25). Once configured, the setting persists through power cycles and is reflected in status register bit SR[7]; no external strapping pins or hardware modifications are required.
Can AT45DQ321-SHFHB-T be used as a drop-in replacement for older AT45DB series devices?
AT45DQ321-SHFHB-T is software-compatible with AT45DB321D in standard SPI mode and shares identical pinout and SOIC-8 packaging, but differs in dual/quad I/O command opcodes and RapidS™ timing. Migration requires firmware updates to replace legacy opcodes (e.g., 03h → 0Bh for high-speed read) and validation of tV = 7 ns setup timing - it is not a blind drop-in but a straightforward upgrade path.
What security mechanisms does AT45DQ321-SHFHB-T provide beyond sector protection?
In addition to software/hardware sector protection, AT45DQ321-SHFHB-T provides three layered security features: (1) 128-byte OTP Security Register with factory-unique 64-byte ID, (2) irreversible Sector Lockdown that permanently disables write/erase to selected sectors, and (3) Quad Enable/Disable commands (35h/36h) requiring explicit unlock sequences - all enforced in hardware without firmware dependency.
AT45DQ321-SHFHB-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:
- -
- 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-T FAQ
1.How can I place an order for AT45DQ321-SHFHB-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DQ321-SHFHB-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-SHFHB-T reliable?
The price and inventory of AT45DQ321-SHFHB-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-SHFHB-T is usually 5 days.
3.What payment methods are accepted for AT45DQ321-SHFHB-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DQ321-SHFHB-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DQ321-SHFHB-T?
AT45DQ321-SHFHB-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DQ321-SHFHB-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-SHFHB-T?
For technical support, including AT45DQ321-SHFHB-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DQ321-SHFHB-T requirements.
6.How does Aetrix verify that AT45DQ321-SHFHB-T is sourced from the original manufacturer or authorized distributors?
All AT45DQ321-SHFHB-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-SHFHB-T meets industry standards.
7.What is the process for return or replacement of AT45DQ321-SHFHB-T?
All AT45DQ321-SHFHB-T units undergo pre-shipment inspection (PSI). If there is an issue with AT45DQ321-SHFHB-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-SHFHB-T part is unused and in its original packaging.
Return procedure for AT45DQ321-SHFHB-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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