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Renesas AT25DQ321-MH-T
- Part No.:
- AT25DQ321-MH-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-UDFN Exposed Pad
- Datasheet:
-
AT25DQ321-MH-T.pdf
- Description:
- IC FLASH 32MBIT SPI 100MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,663
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Product details
Overview
AT25DQ321-MH-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 industrial temperature range (−40 °C to +85 °C). It serves as nonvolatile program/data storage in microcontroller boot loaders, firmware update buffers, and IoT edge node configuration storage.
For engineers reviewing the AT25DQ321-MH-T datasheet, AT25DQ321-MH-T pinout, AT25DQ321-MH-T application, or AT25DQ321-MH-T equivalent, key selection criteria include quad-mode timing compliance, 512/528-byte configurable page size, ultra-deep power-down current (500 nA), sector lockdown security, and SOIC-8 package compatibility with legacy PCB footprints.
Technical Context
The AT25DQ321-MH-T implements a dual-SRAM-buffer architecture (512/528 bytes each), enabling concurrent buffer write while main array reprogramming. Its command set supports RapidS™ high-speed mode, hardware/software reset, and JEDEC-standard Manufacturer & Device ID reads.
It features programmable page size (factory-configurable 512 or default 528 bytes), four erase granularities (page/4 kB block/64 kB sector/chip), and suspend/resume for program/erase operations-enabling deterministic real-time system response during flash maintenance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory density | 32 Mbit main array + 1 Mbit extra buffer space - supports full firmware images plus secure metadata storage |
| Supply voltage | 2.3 V to 3.6 V - compatible with 2.5 V and 3.3 V logic domains without level shifters |
| Max SPI frequency | 104 MHz - enables >10 MB/s sequential read throughput in standard SPI mode |
| Quad-I/O read speed | 70 MHz - delivers up to 35 MB/s effective bandwidth using 4-bit data bus |
| Page size | User-configurable 512 or 528 bytes - balances alignment efficiency with overhead for ECC or metadata padding |
| Ultra-deep power-down current | 500 nA typical - extends battery life in always-on sensor nodes during extended sleep cycles |
| Endurance | 100,000 program/erase cycles at −40 °C to +85 °C - suitable for field-updatable embedded systems with frequent OTA updates |
| Data retention | 20 years - ensures long-term reliability in unattended infrastructure deployments |
Pinout & Package
AT25DQ321-MH-T uses an 8-lead SOIC (0.208" wide) package, RoHS-compliant and green (Pb/halide-free). Pin functions are defined per JEDEC MS-012AC and Renesas DS-AT45DQ321-031 Rev. H.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS# | Chip Select | Active-low enable for SPI command decoding; must be held low for entire command sequence |
| CLK | Serial Clock Input | Synchronizes all SPI data transfers; supports modes 0 and 3 with 104 MHz max frequency |
| MOSI | Master Out Slave In | Carries commands, addresses, and write data; supports single/dual/quad input modes |
| MISO | Master In Slave Out | Returns status, IDs, and read data; supports single/dual/quad output modes |
| WP# | Write Protect | Hardware-enabled sector protection; low = lock sectors, high = allow writes/erases |
| HOLD# | Pause Transfer | Halts ongoing read/write without deselecting chip; enables multi-master arbitration |
| VCC | Power Supply | 2.3–3.6 V supply; decoupling capacitor required within 10 mm of pin |
| 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 overlap of incoming data reception (into buffer) with main array programming - critical for streaming firmware updates |
| Configurable page size | Factory-set 512-byte or default 528-byte pages - accommodates both legacy DataFlash alignment and modern ECC byte overhead |
| Program/Erase suspend/resume | Allows interruption of long erase cycles (e.g., 64 kB sector erase) to service time-critical interrupts - guarantees deterministic latency |
| 128-byte OTP security register | 64-byte factory-unique ID + 64-byte user-programmable space - enables device binding, license enforcement, and anti-cloning |
| Individual sector lockdown | Per-sector write-protection that persists after power cycle and cannot be reversed - enforces immutable bootloader or calibration data storage |
| RapidS™ high-speed mode | Reduces setup/hold timing margins vs. legacy SPI - increases maximum reliable clock rate in noise-sensitive layouts |
Applications
| Industrial PLC Firmware Storage | Medical Sensor Calibration Data |
|---|---|
Use Scenario: Storing and updating ladder logic programs and I/O mapping tables in programmable logic controllers with zero-downtime field upgrades. IC Role / Device Role / Timing Role: Nonvolatile code storage with atomic page-level writes and suspend-capable erases to prevent corruption during brown-out events. Use Value: Enables safe over-the-air firmware patches without requiring full chip erase - reducing update time by >90% versus legacy flash parts. | Use Scenario: Retaining factory-calibrated sensor coefficients and patient-specific configuration profiles in portable diagnostic devices. IC Role / Device Role / Timing Role: Secure, tamper-resistant parameter storage with sector lockdown preventing accidental or malicious overwrite of calibration constants. Use Value: Guarantees measurement traceability and regulatory compliance (IEC 62304) via immutable, OTP-backed calibration records. |
| Smart Meter Bootloader Image | Automotive Telematics OTA Cache |
Use Scenario: Hosting signed bootloader binaries in utility smart meters subject to ANSI C12.22 and DLMS/COSEM standards. IC Role / Device Role / Timing Role: High-reliability boot code repository with 20-year data retention and 100K-cycle endurance for cryptographic key rotation. Use Value: Eliminates need for external EEPROM backup; supports secure boot chain verification using on-chip OTP identity. | Use Scenario: Caching differential firmware patches for ECU updates in connected vehicles operating under ISO 21434 cybersecurity requirements. IC Role / Device Role / Timing Role: High-bandwidth, low-power update staging area with quad-I/O read speeds and deep power-down for infotainment subsystems. Use Value: Reduces cellular data usage and update window duration by enabling local patch application without full image download. |
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, no extra buffer memory, 133 MHz max clock, lacks RapidS™ and configurable page size | Optimized for cost-sensitive consumer electronics; no sector lockdown or OTP security register | Choose when highest clock speed is prioritized over security and buffer concurrency |
| Macronix MX25L3233F | 32 Mbit density, 2.3–3.6 V supply, 104 MHz SPI, no extra buffer, no RapidS™, no OTP register, supports DTR mode only | Targeted at automotive AEC-Q100 Grade 3; lacks suspend/resume and individual sector lock-down | Choose for AEC-Q100-compliant designs where extended temperature operation is mandatory but advanced security is not required |
Compared with W25Q32JW and MX25L3233F, the AT25DQ321-MH-T uniquely combines dual-SRAM buffering, factory-configurable page size, RapidS™ timing, and permanent sector lockdown - making it optimal for safety-critical, update-intensive industrial and medical systems where data integrity and deterministic operation are non-negotiable.
Availability
AT25DQ321-MH-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical sensor calibration data retention, and smart meter bootloader image hosting requiring stable component supply across extended product lifecycles.
Supply support for AT25DQ321-MH-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 trusted microcontrollers, analog, power, and memory solutions for industrial, automotive, and enterprise applications.
The AT25DQ321 product line delivers high-reliability serial flash memory optimized for deterministic real-time embedded systems requiring secure, concurrent, and low-power nonvolatile storage - especially where firmware update robustness and data immutability are critical.
FAQ
What is the factory-default page size for AT25DQ321-MH-T?
The AT25DQ321-MH-T ships with a default page size of 528 bytes, which includes 512 bytes of user data plus 16 bytes of overhead for ECC or metadata. This setting can be changed to 512 bytes via factory configuration - confirmed in Renesas DS-AT45DQ321-031 Rev. H Section 12 and Table 25. The AT25DQ321-MH-T does not support runtime page size switching; configuration is fixed at manufacture.
Does AT25DQ321-MH-T support Quad SPI (QSPI) protocol natively?
Yes, the AT25DQ321-MH-T supports true Quad-I/O operation with dedicated 6Bh (quad-output read) and EBh (quad-input write) opcodes, achieving 70 MHz effective clock rate and up to 35 MB/s bandwidth. Unlike basic QSPI peripherals, it requires explicit Quad Enable command (38h) and status register bit 6 assertion - verified in Sections 5.1 and 23 of the AT25DQ321-MH-T datasheet.
How does the AT25DQ321-MH-T handle power loss during programming?
The AT25DQ321-MH-T incorporates automatic write abort on VCC drop below 2.3 V, ensuring partial writes do not corrupt valid data. Its Program Suspend feature allows host MCU to pause active programming before entering low-power states, and Resume restores operation without data loss - detailed in Sections 7.12–7.13 of the AT25DQ321-MH-T datasheet.
Can the 128-byte OTP security register in AT25DQ321-MH-T be reprogrammed?
No - the 128-byte OTP (One-Time Programmable) security register in the AT25DQ321-MH-T is permanently programmable only once. The first 64 bytes are factory-programmed with a unique device identifier and cannot be altered; the remaining 64 bytes are user-programmable in-system but become read-only after initial write - as specified in Section 9.2 of the AT25DQ321-MH-T datasheet.
Is AT25DQ321-MH-T pin-compatible with older AT45DB series devices?
No - although functionally similar, the AT25DQ321-MH-T uses updated command opcodes (e.g., 6Bh for quad read vs. 6Bh legacy alias) and revised status register layout. Its SOIC-8 pinout matches AT45DB321E, but software drivers require modification for RapidS™ timing, suspend/resume, and OTP register access - confirmed in Tables 30–34 of the AT25DQ321-MH-T datasheet.
AT25DQ321-MH-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-UDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 32Mbit
- Memory Organization:
- 256 Bytes x 16384 pages
- Memory Interface:
- SPI
- Clock Frequency:
- 100 MHz
- Write Cycle Time - Word, Page:
- 7µs, 3ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-UDFN (5x6)
AT25DQ321-MH-T FAQ
1.How can I place an order for AT25DQ321-MH-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DQ321-MH-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 AT25DQ321-MH-T reliable?
The price and inventory of AT25DQ321-MH-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25DQ321-MH-T is usually 5 days.
3.What payment methods are accepted for AT25DQ321-MH-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DQ321-MH-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DQ321-MH-T?
AT25DQ321-MH-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DQ321-MH-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 AT25DQ321-MH-T?
For technical support, including AT25DQ321-MH-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DQ321-MH-T requirements.
6.How does Aetrix verify that AT25DQ321-MH-T is sourced from the original manufacturer or authorized distributors?
All AT25DQ321-MH-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 AT25DQ321-MH-T meets industry standards.
7.What is the process for return or replacement of AT25DQ321-MH-T?
All AT25DQ321-MH-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25DQ321-MH-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 AT25DQ321-MH-T part is unused and in its original packaging.
Return procedure for AT25DQ321-MH-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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