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Renesas AT25DQ321-S3H-T
- Part No.:
- AT25DQ321-S3H-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25DQ321-S3H-T.pdf
- Description:
- IC FLASH 32MBIT SPI 100MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,825
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Product details
Overview
AT25DQ321-S3H-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 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-S3H-T datasheet, AT25DQ321-S3H-T pinout, AT25DQ321-S3H-T application, or AT25DQ321-S3H-T equivalent, key selection criteria include quad-mode read throughput, ultra-deep power-down current (500 nA), page size configurability (512/528 bytes), dual SRAM buffers for concurrent I/O, and sector lockdown security for firmware integrity.
Technical Context
The AT25DQ321-S3H-T implements a two-buffer architecture with independent 512/528-byte SRAM buffers enabling simultaneous data reception and main array reprogramming. Its command set supports RapidS™ high-speed SPI modes 0 and 3, plus dedicated opcodes for dual-input/quad-input buffer writes and dual-output/quad-output reads.
Memory organization includes configurable page sizes, four erase granularities (page/4 kB block/64 kB sector/chip), and hardware/software protection via individual sector lock-down and a 128-byte OTP security register containing 64 bytes of factory-unique ID and 64 bytes user-programmable space.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit main array + 1 Mbit extra buffer space - enables separate firmware image staging and runtime parameter storage |
| Supply Voltage | 2.3 V to 3.6 V - supports direct interface with 2.5 V and 3.3 V logic systems without level shifting |
| Max SPI Clock Rate | 104 MHz - delivers up to 104 MB/s sequential read bandwidth in standard SPI mode |
| Quad-I/O Read Speed | 70 MHz - achieves 280 MB/s effective throughput using four data lines |
| Page Size | User-configurable 512 or 528 bytes - balances alignment efficiency with legacy DataFlash compatibility |
| Power-Down Current | 500 nA ultra-deep power-down - extends battery life in always-on sensor nodes and wearables |
| Endurance | 100,000 program/erase cycles at −40 °C to +85 °C - suitable for frequent field firmware updates |
| Data Retention | 20 years - ensures long-term reliability in unattended industrial deployments |
Pinout & Package
AT25DQ321-S3H-T is packaged in an 8-lead SOIC (0.208" wide) per ordering code S3H, with lead finish matte tin and RoHS-compliant green packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable for SPI command decoding; must be held low during entire instruction sequence |
| SI | Serial Input | Input for command, address, and write data in standard and dual/quad modes |
| SO | Serial Output | Output for read data and status registers; functions as bidirectional I/O in dual/quad modes |
| SCK | Serial Clock | Master-generated clock driving all timing-critical operations up to 104 MHz |
| WP | Write Protect | Hardware-enabled sector protection; low = enable protection, high = disable |
| RESET | Hardware Reset | Asynchronous active-low reset that clears internal state and exits deep power-down |
| HOLD | Operation Suspend | Pauses ongoing read/write without deselecting chip; enables multi-tasking on shared bus |
| VCC / GND | Power / Ground | Single 2.3–3.6 V supply; decoupling capacitor required within 10 mm of pins |
Key Features
| Feature | Design Value |
|---|---|
| Dual/Quad I/O Support | Enables 2× or 4× read/write bandwidth vs. standard SPI - reduces firmware load time in resource-constrained MCUs |
| Two Independent SRAM Buffers | Allows overlapping buffer write and main memory page program - eliminates I/O idle time during firmware updates |
| Program/Erase Suspend & Resume | Permits urgent read access during long erase operations - critical for real-time system responsiveness |
| 128-byte OTP Security Register | Provides immutable device identity and user-defined secure keys - foundational for secure boot and anti-cloning |
| Individual Sector Lock-down | Makes any 64 kB sector permanently read-only after programming - prevents accidental or malicious overwrite of bootloader |
| Ultra-Deep Power-Down Mode | Reduces current to 500 nA while preserving memory contents - ideal for energy-harvesting and battery-backed applications |
Applications
| Firmware Update Storage | Secure Bootloader Memory |
|---|---|
Use Scenario: Storing validated firmware images prior to atomic swap into active execution region in MCU-based edge devices. IC Role / Device Role / Timing Role: Nonvolatile staging memory with dual-buffer concurrency and suspend-capable erase - enables zero-downtime updates. Use Value: Eliminates risk of bricking during power loss mid-update via buffer-to-main-memory atomic page program with built-in erase. | Use Scenario: Hosting immutable bootloader code and cryptographic keys in medical or industrial controllers requiring regulatory compliance. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage with sector lockdown and OTP register - enforces chain-of-trust at boot. Use Value: Prevents unauthorized modification of startup code through hardware-enforced read-only locking of critical sectors. |
| Configuration & Calibration Data | IoT Sensor Node Logging |
Use Scenario: Retaining device-specific calibration coefficients, network credentials, and operational parameters across power cycles. IC Role / Device Role / Timing Role: Low-power, high-endurance parameter store with 100,000-cycle rating - survives years of field recalibration. Use Value: Ensures consistent sensor accuracy and connectivity without requiring external EEPROM or battery-backed RAM. | Use Scenario: Local buffering of environmental readings (temperature, humidity, motion) in battery-powered wireless sensors. IC Role / Device Role / Timing Role: Energy-efficient logging memory with 500 nA ultra-deep power-down - extends battery life to multi-year operation. Use Value: Supports duty-cycled sensing with minimal quiescent current, reducing replacement frequency in inaccessible deployments. |
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 W25Q32JVSNIQ | 32 Mbit, 1.65–3.6 V supply, 133 MHz max clock, no dual/quad buffer architecture, no OTP security register | Lacks concurrent buffer operation and hardware sector lockdown - requires software-managed protection | Choose when maximum read speed is prioritized over secure concurrent programming |
| Macronix MX25L3233FZBI-10G | 32 Mbit, 2.3–3.6 V, 104 MHz SPI, supports QPI mode but no RapidS™ or dual-input buffer write | No SRAM buffer overlap capability - introduces latency during firmware update sequences | Prefer for cost-sensitive designs where buffer concurrency and ultra-low power-down are not required |
Compared with W25Q32JVSNIQ and MX25L3233FZBI-10G, the AT25DQ321-S3H-T uniquely combines dual-SRAM buffering, RapidS™ timing, 500 nA ultra-deep power-down, and hardware-enforced sector lockdown - making it optimal for secure, low-power, high-reliability firmware storage in certified embedded systems.
Availability
AT25DQ321-S3H-T is available at Aetrix Electronics and suitable for firmware update storage, secure bootloader memory, and IoT sensor node logging requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.
Supply support for AT25DQ321-S3H-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 automotive, industrial, infrastructure, and IoT applications.
The AT25DQ321-S3H-T belongs to Renesas' DataFlash® family, engineered specifically for robust, secure, and energy-efficient nonvolatile storage in safety-critical and battery-operated embedded systems.
FAQ
What is the operating voltage range for the AT25DQ321-S3H-T?
The AT25DQ321-S3H-T operates from 2.3 V to 3.6 V, enabling direct integration with common 2.5 V and 3.3 V microcontroller I/O domains without external level shifters. This single-supply range simplifies power design and improves noise immunity in mixed-signal environments. The AT25DQ321-S3H-T maintains full functionality-including 104 MHz SPI operation and Quad-I/O read-at the minimum 2.3 V supply.
Does the AT25DQ321-S3H-T support true quad-SPI mode with four data lines?
Yes, the AT25DQ321-S3H-T supports true Quad-I/O operation using dedicated opcodes (e.g., 6Bh for quad-output read), delivering up to 280 MB/s effective throughput at 70 MHz. Unlike basic QSPI peripherals, it also supports quad-input buffer writes and dual-input variants, enabling full bidirectional quad-speed transfers. The AT25DQ321-S3H-T requires explicit Quad Enable command (38h) and configuration register setting to activate this mode.
How does the dual-SRAM buffer architecture improve firmware update reliability in the AT25DQ321-S3H-T?
The AT25DQ321-S3H-T integrates two independent 512/528-byte SRAM buffers, allowing new firmware to be written into one buffer while the other simultaneously programs the main memory array. This eliminates bus contention and guarantees atomic page updates-even during power interruption-because buffer-to-main-memory transfer is an all-or-nothing operation. The AT25DQ321-S3H-T thus prevents partial writes that could corrupt the active firmware image.
Can the AT25DQ321-S3H-T be used in automotive applications requiring extended temperature operation?
The AT25DQ321-S3H-T is specified for the full industrial temperature range (−40 °C to +85 °C) and offers 100,000 program/erase cycles within that range. While not AEC-Q100 qualified, its electrical and endurance specs meet many under-hood and cabin control module requirements. For automotive-grade assurance, Renesas offers pin-compatible variants like AT25DQ321-S3X-T (−40 °C to +105 °C, 10,000 cycles); the AT25DQ321-S3H-T remains suitable for non-safety-critical infotainment and telematics subsystems.
What security mechanisms does the AT25DQ321-S3H-T provide to protect firmware integrity?
The AT25DQ321-S3H-T provides three hardware-enforced security layers: (1) individual sector protection via WP pin or software commands, (2) permanent sector lockdown that makes any 64 kB sector read-only after programming, and (3) a 128-byte OTP security register with 64 bytes of factory-unique ID and 64 bytes user-programmable space. These features collectively prevent unauthorized read, write, or erase of bootloader and firmware partitions. The AT25DQ321-S3H-T implements these protections at the silicon level-no firmware overhead required.
AT25DQ321-S3H-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- 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-SOIC
AT25DQ321-S3H-T FAQ
1.How can I place an order for AT25DQ321-S3H-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DQ321-S3H-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-S3H-T reliable?
The price and inventory of AT25DQ321-S3H-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-S3H-T is usually 5 days.
3.What payment methods are accepted for AT25DQ321-S3H-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DQ321-S3H-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DQ321-S3H-T?
AT25DQ321-S3H-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DQ321-S3H-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-S3H-T?
For technical support, including AT25DQ321-S3H-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DQ321-S3H-T requirements.
6.How does Aetrix verify that AT25DQ321-S3H-T is sourced from the original manufacturer or authorized distributors?
All AT25DQ321-S3H-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-S3H-T meets industry standards.
7.What is the process for return or replacement of AT25DQ321-S3H-T?
All AT25DQ321-S3H-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25DQ321-S3H-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-S3H-T part is unused and in its original packaging.
Return procedure for AT25DQ321-S3H-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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