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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Renesas AT45DQ321-SHFHJ-T

Name: AT45DQ321-SHFHJ-T
Brand: Renesas
SKU: AT45DQ321-SHFHJ-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AT45DQ321-SHFHJ-T

Manufacturer:: Renesas

Category:: Memory

Package:: 8-SOIC (0.209", 5.30mm Width)

Datasheet:: AT45DQ321-SHFHJ-T.pdf

Description:: IC FLASH 32MBIT SPI 104MHZ 8SOIC

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Product details

Overview

AT45DQ321-SHFHJ-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-SHFHJ-T datasheet, AT45DQ321-SHFHJ-T pinout, AT45DQ321-SHFHJ-T application, or AT45DQ321-SHFHJ-T equivalent, key selection considerations include its 2.3 V minimum supply, ultra-deep power-down current (500 nA), sector lockdown security, RapidS™ high-speed mode compatibility, and dual SRAM buffers enabling concurrent read-while-write operation.

Technical Context

The AT45DQ321-SHFHJ-T implements a serial flash architecture with two independent 512/528-byte SRAM buffers, enabling simultaneous buffer write and main memory reprogramming. Its command set supports legacy SPI modes 0/3 and RapidS™ variants, with dedicated opcodes for Dual-I/O (3Bh/BBh) and Quad-I/O (6Bh/EBh) reads and writes.

Memory organization includes page (512/528 B), block (4 kB), sector (64 kB), and chip-level erase options, plus hardware/software sector protection and a 128-byte OTP security register - 64 bytes factory-programmed with unique ID and 64 bytes user-programmable - all operating across full industrial temperature range (–40 °C to +85 °C).

Key Specifications

Parameter	Value and Actual Design Meaning
Memory capacity	32 Mbit main array + 1 Mbit extra buffer space - supports firmware image storage and 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-power SoCs without level-shifting.
Max SPI frequency	104 MHz - reduces firmware update time by ~2.5× vs. standard 40 MHz SPI flash in high-throughput bootloading.
Quad-I/O read speed	70 MHz - delivers up to 280 MB/s effective throughput for continuous array reads in high-bandwidth applications.
Page size	User-configurable 512 or 528 bytes - 528-byte default aligns with legacy DataFlash compatibility; 512-byte option optimizes for standard SPI NOR use cases.
Power-down current	500 nA ultra-deep power-down - extends battery life in always-on edge sensors and IoT endpoints requiring multi-year operation.
Endurance	100,000 program/erase cycles at –40 °C to +85 °C - suitable for field-upgradable devices with frequent OTA updates.
Data retention	20 years - ensures long-term reliability of calibration data, device identity, and configuration parameters in industrial deployments.

Pinout & Package

AT45DQ321-SHFHJ-T uses an 8-pad Ultra-thin DFN package (5 mm × 6 mm × 0.6 mm), RoHS-compliant and halide-free, optimized for space-constrained industrial PCBs.

Pin/Terminal	Circuit Role	Design Meaning
CS	Chip Select	Active-low enable for SPI command decoding; must be asserted before SCLK edge to initiate valid transaction.
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 input for commands, addresses, and write data; supports single/Dual/Quad-input buffer write via opcode selection.
MISO	Master In Slave Out	Serial output for read data and status registers; operates in single/Dual/Quad-output modes depending on command and configuration.
WP	Write Protect	Hardware-controlled sector lock-down enable; when low, prevents program/erase of protected sectors regardless of software commands.
HOLD	Hold Input	Pauses ongoing serial transfer without deselecting chip; allows host MCU to service interrupts while preserving transaction state.
VCC	Power Supply	2.3–3.6 V supply; decoupling capacitor required within 5 mm of pin to maintain stable operation during high-speed reads.
GND	Ground	Reference for all I/O and internal circuitry; requires low-impedance connection to minimize noise coupling into sensitive analog blocks.

Key Features

Feature	Design Value
Dual SRAM buffers (512/528 B each)	Enables true concurrent operation: receive new firmware into one buffer while programming previous buffer contents to flash - eliminates write latency stalls in real-time systems.
RapidS™ high-speed mode	Reduces instruction overhead and increases effective bandwidth by eliminating dummy cycles in high-frequency reads, critical for deterministic boot timing.
Program/Erase suspend/resume	Allows interruption of long erase operations (e.g., sector erase) to service time-critical interrupts, then resume - essential for hard real-time control loops.
128-byte OTP security register	Provides tamper-resistant storage for cryptographic keys, device certificates, or calibration constants; factory-programmed 64-byte UID prevents cloning.
Individual sector lockdown	Permanently disables program/erase on selected sectors via hardware fuse; protects bootloader or safety-critical code from accidental or malicious overwrite.
Ultra-deep power-down (500 nA)	Extends shelf life and operational lifetime in battery-powered remote sensors, enabling >10-year deployment without maintenance.

Applications

Firmware Storage in Industrial PLCs	Secure Bootloader for Medical Devices
Use Scenario: Storing and updating firmware images in programmable logic controllers operating in harsh factory environments with wide temperature swings and EMI exposure. IC Role / Device Role / Timing Role: Non-volatile firmware repository with fast read access for deterministic boot and in-field OTA updates via buffered page programming. Use Value: 100,000-cycle endurance and 20-year data retention ensure reliable operation over PLC lifetime; Quad-I/O read accelerates boot sequence by loading kernel image in <150 ms.	Use Scenario: Hosting signed bootloader code in Class II medical instruments requiring FDA-compliant secure boot and anti-tampering features. IC Role / Device Role / Timing Role: Secure, immutable storage for verified bootloader and public key certificates, enforced via sector lockdown and OTP register. Use Value: Hardware-enforced sector lockdown prevents unauthorized modification; factory-programmed UID enables device-specific key binding and audit trail traceability.
Data Logging in Smart Energy Meters	Configuration Storage in Automotive Telematics Units
Use Scenario: Capturing time-stamped energy consumption metrics every 15 minutes under strict power budget constraints (<10 µA average current). IC Role / Device Role / Timing Role: Low-power non-volatile buffer for burst-write logging, leveraging dual buffers to absorb metering interrupts without data loss. Use Value: 500 nA ultra-deep power-down minimizes quiescent drain; buffer-to-main-memory page program enables atomic 528-byte writes aligned with billing cycle boundaries.	Use Scenario: Storing vehicle-specific calibration maps, CAN bus routing tables, and OTA update metadata in telematics control units exposed to automotive temperature extremes. IC Role / Device Role / Timing Role: Robust configuration store with sector protection isolating safety-critical CAN routing tables from user-modifiable settings. Use Value: Full industrial temp range (–40 °C to +85 °C) and 10,000-cycle endurance at +105 °C support under-hood deployment; JEDEC ID verification ensures supply chain authenticity.

Firmware Storage in Industrial PLCs

Secure Bootloader for Medical Devices

Use Scenario: Storing and updating firmware images in programmable logic controllers operating in harsh factory environments with wide temperature swings and EMI exposure.

IC Role / Device Role / Timing Role: Non-volatile firmware repository with fast read access for deterministic boot and in-field OTA updates via buffered page programming.

Use Value: 100,000-cycle endurance and 20-year data retention ensure reliable operation over PLC lifetime; Quad-I/O read accelerates boot sequence by loading kernel image in <150 ms.

Use Scenario: Hosting signed bootloader code in Class II medical instruments requiring FDA-compliant secure boot and anti-tampering features.

IC Role / Device Role / Timing Role: Secure, immutable storage for verified bootloader and public key certificates, enforced via sector lockdown and OTP register.

Use Value: Hardware-enforced sector lockdown prevents unauthorized modification; factory-programmed UID enables device-specific key binding and audit trail traceability.

Data Logging in Smart Energy Meters

Configuration Storage in Automotive Telematics Units

Use Scenario: Capturing time-stamped energy consumption metrics every 15 minutes under strict power budget constraints (<10 µA average current).

IC Role / Device Role / Timing Role: Low-power non-volatile buffer for burst-write logging, leveraging dual buffers to absorb metering interrupts without data loss.

Use Value: 500 nA ultra-deep power-down minimizes quiescent drain; buffer-to-main-memory page program enables atomic 528-byte writes aligned with billing cycle boundaries.

Use Scenario: Storing vehicle-specific calibration maps, CAN bus routing tables, and OTA update metadata in telematics control units exposed to automotive temperature extremes.

IC Role / Device Role / Timing Role: Robust configuration store with sector protection isolating safety-critical CAN routing tables from user-modifiable settings.

Use Value: Full industrial temp range (–40 °C to +85 °C) and 10,000-cycle endurance at +105 °C support under-hood deployment; JEDEC ID verification ensures supply chain authenticity.

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 dual-buffer architecture, lacks RapidS™ and sector lockdown; supports octal DTR mode instead of Quad-I/O.	Better suited for ultra-low-voltage portable devices; not recommended where concurrent read-while-write or hardware-based sector immutability is required.	Select AT45DQ321-SHFHJ-T when dual SRAM buffers, 2.3 V minimum operation, or permanent sector lockdown are mandatory design requirements.
Macronix MX25L3233F	32 Mbit, 2.7–3.6 V supply, standard SPI only (no Dual/Quad-I/O), no OTP register, 20-year retention but only 100K cycles at +85 °C.	Lower cost for basic firmware storage in fixed-voltage industrial systems; lacks advanced security and low-power features.	Choose AT45DQ321-SHFHJ-T for designs needing sub-2.5 V compatibility, Quad-I/O throughput, or integrated security beyond basic write protection.

Compared with W25Q32JW and MX25L3233F, the AT45DQ321-SHFHJ-T uniquely combines ultra-low-voltage operation (2.3 V), dual-buffer concurrency, hardware sector lockdown, and 500 nA deep power-down - making it the only option meeting stringent requirements for secure, low-power, real-time embedded firmware storage.

Availability

AT45DQ321-SHFHJ-T is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, smart metering, and automotive telematics requiring stable component supply, long-lifecycle support, and guaranteed green packaging compliance.

Supply support for AT45DQ321-SHFHJ-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 industrial, automotive, and enterprise applications.

The AT45DQ321-SHFHJ-T belongs to Renesas' DataFlash family, designed specifically for embedded systems demanding high-reliability non-volatile storage with advanced security, low-power operation, and seamless integration into resource-constrained MCUs.

FAQ

What is the operating voltage range of the AT45DQ321-SHFHJ-T?

The AT45DQ321-SHFHJ-T operates from 2.3 V to 3.6 V. This 2.3 V minimum supply enables direct interfacing with modern low-voltage microcontrollers and SoCs without level-shifting circuitry, reducing BOM count and board area. The AT45DQ321-SHFHJ-T maintains full functionality-including Quad-I/O read and RapidS™ mode-across this entire range.

Does the AT45DQ321-SHFHJ-T support true concurrent read-while-write operation?

Yes, the AT45DQ321-SHFHJ-T features two fully independent 512/528-byte SRAM buffers that allow simultaneous reception of new data into one buffer while programming the other buffer's contents into main memory. This eliminates write latency stalls, making the AT45DQ321-SHFHJ-T ideal for real-time firmware updates and continuous data logging applications.

How does the sector lockdown feature work on the AT45DQ321-SHFHJ-T?

The AT45DQ321-SHFHJ-T provides hardware-enforced sector lockdown: once activated via the Sector Lockdown Register, selected memory sectors become permanently read-only, even if WP is deasserted or software commands attempt erasure. This irreversible protection is implemented using one-time-programmable fuses, ensuring bootloader or safety-critical code cannot be overwritten-critical for certified medical or industrial control systems using the AT45DQ321-SHFHJ-T.

What is the maximum clock frequency supported by the AT45DQ321-SHFHJ-T in Quad-I/O mode?

The AT45DQ321-SHFHJ-T supports up to 70 MHz in Quad-I/O read mode, delivering up to 280 MB/s effective throughput. This is enabled by dedicated opcodes (6Bh/EBh) and internal pipeline optimization. Note that Quad-I/O write requires separate buffer write commands (e.g., 38h/68h) and is limited to 52 MHz per the AC characteristics table in the datasheet for the AT45DQ321-SHFHJ-T.

Is the AT45DQ321-SHFHJ-T qualified for automotive applications?

The AT45DQ321-SHFHJ-T is specified for the full industrial temperature range (–40 °C to +85 °C) and offers 10,000 program/erase cycles at +105 °C, but it is not AEC-Q100 qualified. For automotive cabin or infotainment applications within industrial temp limits, the AT45DQ321-SHFHJ-T may be used subject to system-level qualification; however, under-hood or safety-critical ADAS systems require AEC-Q100-certified alternatives.

AT45DQ321-SHFHJ-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-SHFHJ-T FAQ

1.How can I place an order for AT45DQ321-SHFHJ-T through Aetrix?

Please submit a Request for Quotation (RFQ) for AT45DQ321-SHFHJ-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-SHFHJ-T reliable?

The price and inventory of AT45DQ321-SHFHJ-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-SHFHJ-T is usually 5 days.

3.What payment methods are accepted for AT45DQ321-SHFHJ-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DQ321-SHFHJ-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT45DQ321-SHFHJ-T?

AT45DQ321-SHFHJ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT45DQ321-SHFHJ-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-SHFHJ-T?

For technical support, including AT45DQ321-SHFHJ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DQ321-SHFHJ-T requirements.

6.How does Aetrix verify that AT45DQ321-SHFHJ-T is sourced from the original manufacturer or authorized distributors?

All AT45DQ321-SHFHJ-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-SHFHJ-T meets industry standards.

7.What is the process for return or replacement of AT45DQ321-SHFHJ-T?

All AT45DQ321-SHFHJ-T units undergo pre-shipment inspection (PSI). If there is an issue with AT45DQ321-SHFHJ-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-SHFHJ-T part is unused and in its original packaging.

Return procedure for AT45DQ321-SHFHJ-T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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