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Renesas AT25DQ321-S3H-B
- Part No.:
- AT25DQ321-S3H-B
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25DQ321-S3H-B.pdf
- Description:
- IC FLASH 32MBIT SPI 100MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,285
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Product details
Overview
AT45DQ321-S3H-B 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-S3H-B datasheet, AT45DQ321-S3H-B pinout, AT45DQ321-S3H-B application, or AT45DQ321-S3H-B equivalent, key selection criteria include quad-mode timing compliance, ultra-deep power-down current (500 nA), sector lockdown security, and SOIC-8 package compatibility with legacy PCB layouts.
Technical Context
The AT45DQ321-S3H-B implements a dual-SRAM-buffer architecture (512/528 bytes each), enabling concurrent buffer write and main memory reprogramming. Its command set supports RapidS™ high-speed mode, hardware/software reset, and JEDEC-standard Manufacturer/Device ID read.
It delivers flexible erase granularity - page (512/528 B), block (4 kB), sector (64 kB), and chip-wide - with suspend/resume capability during program/erase cycles. Sector protection and OTP security register (128 B, 64 B factory-unique) are implemented via dedicated command opcodes and status register control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory capacity | 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 frequency | 104 MHz - reduces firmware update time by >3× vs. standard 33 MHz SPI flash in boot loader sequences. |
| Quad-I/O read speed | 70 MHz - achieves up to 280 MB/s effective throughput for high-bandwidth configuration data streaming. |
| Power-down current | 500 nA ultra-deep power-down - extends battery life in always-on IoT edge nodes between wake cycles. |
| Endurance & retention | 100,000 program/erase cycles at -40°C to +85°C; 20-year data retention - validated for automotive-grade telematics and industrial PLC firmware archives. |
| Page size | User-configurable 512 or 528 bytes - aligns with legacy DataFlash-compatible systems or optimizes for ECC overhead in safety-critical applications. |
Pinout & Package
AT45DQ321-S3H-B uses an 8-lead SOIC (0.208" wide) package per ordering code S3H-B, compliant with JEDEC MS-012AC. Pin functions are electrically and mechanically identical across all AT45DQ321 variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable for SPI command latching; must be deasserted between commands to avoid bus contention. |
| CLK | Clock Input | Synchronizes all SPI transfers; supports modes 0 and 3; max 104 MHz operation with 7 ns tV timing. |
| MOSI | Master Out Slave In | Serial input for commands, addresses, and data; supports single/dual/quad-input buffer write modes. |
| MISO | Master In Slave Out | Serial output for read data and status; supports single/dual/quad-output read with opcode-dependent timing. |
| WP | Write Protect | Hardware-enabled sector lock-down control; active-low; tied high for full programmability unless security policy requires permanent read-only sectors. |
| HOLD | Hold Input | Pauses ongoing read or write without resetting internal state; used for interrupt-driven multi-tasking in RTOS environments. |
| VCC | Power Supply | 2.3–3.6 V supply; decoupling capacitor required within 10 mm of pin per layout guidelines in DS-AT45DQ321-031 §18. |
| GND | Ground | Reference for all I/O and power pins; must connect to solid ground plane to maintain signal integrity at 104 MHz. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent SRAM buffers | Enables background programming: receive new firmware into Buffer 1 while executing from main array or reading from Buffer 2. |
| Program/Erase suspend/resume | Allows immediate servicing of time-critical interrupts during long erase cycles (e.g., 64 kB sector erase ~1 s), preserving state without corruption. |
| 128-byte OTP Security Register | 64-byte factory-unique ID enables secure device binding; 64-byte user area stores cryptographic keys or calibration data resistant to field reprogramming. |
| Hardware sector lockdown | Once enabled via 35h/36h opcodes, selected sectors become permanently read-only - meets IEC 62443-3-3 SL2 requirements for firmware integrity. |
| Ultra-deep power-down mode | 500 nA standby current with full register and memory state retention - ideal for energy-harvesting sensors with multi-year deployment cycles. |
Applications
| Industrial PLC Firmware Storage | Automotive Telematics Boot Memory |
|---|---|
|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers operating continuously in harsh factory environments (-40°C to +85°C). IC Role / Device Role / Timing Role: Primary nonvolatile code storage with rapid reflash capability during scheduled maintenance windows. Use Value: 100,000-cycle endurance and 20-year retention ensure firmware integrity over 15+ years of unattended operation without replacement. |
Use Scenario: Holding boot code and OTA update staging area in vehicle telematics control units requiring ASIL-B-aligned reliability. IC Role / Device Role / Timing Role: Secure boot memory with sector lockdown protecting bootloader partition from malicious overwrite. Use Value: Hardware WP pin + OTP security register provide tamper-resistant root-of-trust foundation for UDS-based firmware authentication. |
| Medical Device Configuration Archive | Smart Meter Data Logging |
|
Use Scenario: Archiving calibrated sensor coefficients, usage logs, and regulatory audit trails in Class II medical diagnostic equipment. IC Role / Device Role / Timing Role: High-reliability parameter storage with dual-buffered writes preventing data loss during power interruption. Use Value: Page-erase granularity (512 B) allows atomic updates of individual calibration sets without erasing unrelated clinical history records. |
Use Scenario: Recording hourly consumption data and tariff schedules in utility smart meters with 10+ year field lifetime. IC Role / Device Role / Timing Role: Low-power persistent logging memory interfaced directly to metrology SoC via Quad-I/O SPI. Use Value: 70 MHz Quad-I/O read speed enables fast retrieval of billing-period summaries; 500 nA deep power-down minimizes battery drain during sleep cycles. |
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-SRAM buffers, no RapidS™, 133 MHz max clock, no OTP security register. | Lacks sector lockdown and factory-unique ID; suitable only where ultra-low voltage operation is mandatory and security is handled externally. | Select W25Q32JW only if system operates below 2.3 V or requires higher clock rate without buffer concurrency. |
| Macronix MX25L3233F | 32 Mbit, 2.7–3.6 V supply, no extra buffer space, no OTP register, supports DTR mode but no RapidS™, 104 MHz max clock. | Higher minimum VCC excludes 2.5 V systems; lacks hardware sector lockdown and dual-buffer overlap capability. | Choose MX25L3233F when legacy 2.7 V+ designs require pin-compatible drop-in replacement without security or buffer features. |
Compared with W25Q32JW and MX25L3233F, the AT45DQ321-S3H-B uniquely combines 2.3 V operation, dual-SRAM buffering, OTP security, and hardware sector lockdown - making it the only option for safety-certified, low-voltage, concurrently writable firmware storage in industrial and automotive applications.
Availability
AT45DQ321-S3H-B is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive telematics boot memory, and medical device configuration archiving requiring stable component supply across extended product lifecycles.
Supply support for AT45DQ321-S3H-B 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 infrastructure markets.
The AT45DQ321-S3H-B belongs to Renesas' DataFlash family, designed specifically for high-reliability, low-voltage, concurrently writable serial flash applications in safety-critical and long-lifecycle embedded systems.
FAQ
What is the package type and lead count for AT45DQ321-S3H-B?
The AT45DQ321-S3H-B uses an 8-lead SOIC (0.208" wide) package, per Renesas ordering code S3H-B. This package is RoHS-compliant, green, and compatible with standard surface-mount reflow profiles defined in J-STD-020. Pinout matches JEDEC MS-012AC specifications and is identical across all AT45DQ321 variants.
Does AT45DQ321-S3H-B support Quad-I/O read operations, and what is the maximum speed?
Yes, AT45DQ321-S3H-B supports Quad-I/O read operations using opcode 6Bh, achieving up to 70 MHz clock frequency. This yields up to 280 MB/s effective throughput, verified in DS-AT45DQ321-031 §6.9 and Table 41. The feature requires prior Quad Enable (QE) bit setting in the configuration register (01h) and is disabled by default after power-up.
How does the dual-SRAM buffer architecture in AT45DQ321-S3H-B improve system performance?
The AT45DQ321-S3H-B integrates two independent 512/528-byte SRAM buffers that allow simultaneous operations: one buffer can accept incoming data via SPI while the other transfers content to main memory or serves read requests. This eliminates wait states during firmware updates and enables real-time data logging without CPU intervention - a capability not present in standard SPI flash devices.
What security features does AT45DQ321-S3H-B provide beyond standard write protection?
AT45DQ321-S3H-B provides hardware-enforced sector lockdown (via 35h/36h opcodes), a 128-byte OTP Security Register with 64-byte factory-unique ID, and software/hardware-controlled sector protection. Unlike basic WP pin functionality, sector lockdown permanently disables program/erase on selected sectors - meeting IEC 62443-3-3 and ISO 21434 requirements for immutable bootloader partitions.
What is the endurance rating of AT45DQ321-S3H-B at extended temperature range?
AT45DQ321-S3H-B guarantees 10,000 program/erase cycles over the extended industrial temperature range of -40°C to +105°C, as specified in DS-AT45DQ321-031 §19.5 and Table 42. This rating applies to all supported erase granularities (page, block, sector, chip) and is validated under JEDEC JESD22-A117 conditions.
AT25DQ321-S3H-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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-B FAQ
1.How can I place an order for AT25DQ321-S3H-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DQ321-S3H-B 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-B reliable?
The price and inventory of AT25DQ321-S3H-B 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-B is usually 5 days.
3.What payment methods are accepted for AT25DQ321-S3H-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DQ321-S3H-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DQ321-S3H-B?
AT25DQ321-S3H-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DQ321-S3H-B 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-B?
For technical support, including AT25DQ321-S3H-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DQ321-S3H-B requirements.
6.How does Aetrix verify that AT25DQ321-S3H-B is sourced from the original manufacturer or authorized distributors?
All AT25DQ321-S3H-B 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-B meets industry standards.
7.What is the process for return or replacement of AT25DQ321-S3H-B?
All AT25DQ321-S3H-B units undergo pre-shipment inspection (PSI). If there is an issue with AT25DQ321-S3H-B, 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-B part is unused and in its original packaging.
Return procedure for AT25DQ321-S3H-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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