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Renesas AT25DQ321-SH-T
- Part No.:
- AT25DQ321-SH-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25DQ321-SH-T.pdf
- Description:
- IC FLASH 32MBIT SPI 100MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,912
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Product details
Overview
AT25DQ321-SH-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 AT25DQ321-SH-T datasheet, AT25DQ321-SH-T pinout, AT25DQ321-SH-T application, or AT25DQ321-SH-T equivalent, key selection criteria include its 2.3 V minimum supply, Ultra-Deep Power-Down current (500 nA), sector lockdown security, RapidS™ high-speed mode, and JEDEC-standard Manufacturer/Device ID support.
Technical Context
The AT25DQ321-SH-T implements a dual-SRAM-buffer architecture (512/528 bytes each), enabling concurrent buffer write while main array reprogramming occurs. Its command set supports legacy SPI modes 0/3 and RapidS™ timing, with dedicated opcodes for Dual-input/Quad-input Buffer Write (e.g., 0x3B, 0x6B) and Dual-output/Quad-output Read.
Memory organization includes hierarchical erase granularity: Page (512/528 B), Block (4 kB), Sector (64 kB), and Chip (32 Mbit), all with suspend/resume capability. Configuration register controls Quad Enable, page size, and protection lock states - verified via Status Register Byte 2 bit QEB and CONFIG register bit PSZ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit main array + 1 Mbit extra buffer space - enables firmware partitioning and atomic OTA update staging. |
| Supply Voltage | 2.3 V to 3.6 V - supports low-voltage microcontroller interfaces without level-shifting. |
| Max SPI Clock | 104 MHz - achieves up to 104 MB/s raw throughput in single-I/O mode. |
| Quad-I/O Read Speed | 70 MHz - delivers up to 280 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 embedding. |
| Power-Down Current | 500 nA Ultra-Deep Power-Down - extends battery life in always-on sensor nodes. |
| Endurance | 100,000 program/erase cycles at -40°C to +85°C - suitable for frequent field-upgrade applications. |
| Data Retention | 20 years - meets long-lifecycle requirements for industrial control and medical devices. |
Pinout & Package
AT25DQ321-SH-T is packaged in an 8-lead SOIC (0.208" wide), pin-compatible with industry-standard serial flash footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS# | Chip Select | Active-low enable for SPI command decoding; must be held low during entire instruction sequence. |
| CLK | Clock Input | Synchronizes all SPI transfers; supports up to 104 MHz with 7 ns tV (clock-to-output). |
| MOSI | Master Out Slave In | Serial input for commands, addresses, and data; supports Dual/Quad-input modes via opcode configuration. |
| MISO | Master In Slave Out | Serial output for read data; operates in Single/Dual/Quad-output modes per configured opcode (e.g., 0x0B, 0x6B). |
| WP# | Write Protect | Hardware-enabled sector protection; asserts permanent read-only status when driven low with sector lockdown enabled. |
| HOLD# | Hold Control | Pauses ongoing read/write without deselecting chip; maintains internal address pointer during interruption. |
| VCC | Power Supply | 2.3–3.6 V supply; decoupling capacitor required within 10 mm of pin per datasheet layout guidance. |
| GND | Ground | Reference return path for all I/O and core logic; requires low-impedance connection to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-SRAM Buffers | Two independent 512/528-byte buffers allow background programming while host writes new data - eliminates write latency stalls. |
| RapidS™ Operation | High-frequency timing mode reduces setup/hold times, enabling reliable 104 MHz SPI operation without external timing margining. |
| Configurable Page Size | Factory-set 512-byte or default 528-byte pages - accommodates both legacy DataFlash compatibility and optimized ECC/data packing. |
| One-Time Programmable Security Register | 128-byte OTP area with 64-byte factory-unique ID and 64-byte user-programmable space - supports secure boot key binding and device identity attestation. |
| Sector Lockdown | Hardware-permanent read-only enforcement on selected sectors - prevents accidental or malicious overwrite of critical bootloader code. |
| Ultra-Deep Power-Down | 500 nA standby current with full state retention - ideal for energy-harvesting and battery-powered edge nodes requiring multi-year operation. |
Applications
| Industrial PLC Firmware Storage | Medical Device Data Logger |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers operating across -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Nonvolatile code storage with atomic page-level updates and hardware write protection against EMI-induced corruption. Use Value: 100,000-cycle endurance and sector lockdown ensure firmware integrity over 15+ years of field deployment without recalibration. | Use Scenario: Capturing timestamped physiological waveforms (ECG, SpO₂) in portable diagnostic equipment with intermittent power. IC Role / Device Role / Timing Role: High-reliability data buffer and archive memory supporting burst-mode acquisition and low-power background logging. Use Value: Dual-buffer architecture enables continuous sampling into one buffer while the other uploads to host - zero data loss during transfer. |
| Smart Meter Bootloader | Automotive Telematics OTA Module |
Use Scenario: Secure boot image storage in ANSI C12.22-compliant electricity meters with tamper-evident firmware validation. IC Role / Device Role / Timing Role: Trusted execution root-of-trust anchor with OTP-secured cryptographic keys and hardware-enforced read-only boot sector. Use Value: 128-byte OTP register and sector lockdown prevent unauthorized bootloader modification - satisfies IEC 62443-3-3 SL2 requirements. | Use Scenario: Staging and verifying over-the-air firmware updates in vehicle telematics control units before activation. IC Role / Device Role / Timing Role: Dual-image storage partition (active/inactive) with atomic swap capability via buffer-to-main-memory page program. Use Value: Program/erase suspend/resume allows safe interruption during update - avoids bricking during vehicle ignition cycle transitions. |
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, 1.7–3.6 V supply, no extra buffer memory; supports Octal DTR mode but lacks Dual/Quad-input write. | Lacks dual-SRAM buffer architecture - cannot perform concurrent write-and-program operations. | Select when cost sensitivity outweighs need for background programming or when Octal DTR interface is required. |
| Macronix MX25L3233F | 32 Mbit density, 2.7–3.6 V supply only; supports Dual/Quad I/O but no RapidS™ timing or Ultra-Deep Power-Down (3 µA min). | No 500 nA power-down mode - unsuitable for ultra-low-power wake-on-event designs. | Select when higher voltage margin is acceptable and RapidS™ timing compliance is not required. |
Compared with W25Q32JW and MX25L3233F, AT25DQ321-SH-T uniquely combines dual-buffer concurrency, 2.3 V minimum operation, and 500 nA Ultra-Deep Power-Down - making it optimal for battery-constrained, high-integrity firmware and data logging systems where simultaneous access and ultra-low quiescent current are mandatory.
Availability
AT25DQ321-SH-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device data logging, smart meter bootloader, and automotive telematics OTA modules requiring stable component supply and long-term lifecycle assurance.
Supply support for AT25DQ321-SH-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 industrial, automotive, and infrastructure markets.
The AT25DQ321-SH-T belongs to Renesas' DataFlash® family, engineered specifically for high-reliability, low-voltage serial flash applications demanding concurrent buffer operations, robust security, and extended temperature operation.
FAQ
What is the minimum supply voltage required for reliable operation of the AT25DQ321-SH-T?
The AT25DQ321-SH-T operates reliably down to 2.3 V across its full industrial temperature range (-40°C to +85°C). This low-voltage capability enables direct interfacing with 2.5 V or 3.3 V microcontrollers without level shifters, and supports brown-out resilience in battery-powered systems. The 2.3 V minimum is specified in the Absolute Maximum Ratings table and validated across AC/DC characteristics in the datasheet.
Does the AT25DQ321-SH-T support true concurrent read-while-write functionality?
Yes, the AT25DQ321-SH-T supports true concurrent operation via its two independent SRAM buffers (512/528 bytes each). While one buffer accepts incoming data via MOSI, the other can simultaneously program the main memory array - verified by the "Buffer Write" and "Buffer to Main Memory Page Program" command sequences in Section 7 of the datasheet. This eliminates write latency stalls common in single-buffer flash devices.
How is hardware write protection implemented on the AT25DQ321-SH-T?
Hardware write protection on the AT25DQ321-SH-T uses the WP# pin in conjunction with the Sector Protection Register and Sector Lockdown Register. When WP# is asserted low and sector lockdown is enabled (via opcode 0x3D), selected sectors become permanently read-only - even after power cycling. This behavior is confirmed in Tables 8, 9, and 14, and Figure 7 of the datasheet.
What is the purpose of the 128-byte One-Time Programmable (OTP) Security Register in the AT25DQ321-SH-T?
The 128-byte OTP Security Register in the AT25DQ321-SH-T contains 64 bytes pre-programmed with a unique factory-assigned identifier and 64 bytes available for user programming. It serves as a root-of-trust element for secure boot, device authentication, and cryptographic key binding - detailed in Section 9.2 and Table 19 of the datasheet. Once programmed, OTP bytes cannot be erased or rewritten.
Can the AT25DQ321-SH-T be used in automotive applications requiring AEC-Q100 qualification?
No, the AT25DQ321-SH-T is specified for the full industrial temperature range (-40°C to +85°C or -40°C to +105°C per grade), but it is not AEC-Q100 qualified. For automotive applications, Renesas offers the AT25DFxxA series with AEC-Q100 Grade 3 qualification. The AT25DQ321-SH-T datasheet explicitly lists only industrial-grade reliability testing (e.g., JESD22-A108) and does not reference AEC-Q100 in any section.
AT25DQ321-SH-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-SH-T FAQ
1.How can I place an order for AT25DQ321-SH-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DQ321-SH-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-SH-T reliable?
The price and inventory of AT25DQ321-SH-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-SH-T is usually 5 days.
3.What payment methods are accepted for AT25DQ321-SH-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DQ321-SH-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DQ321-SH-T?
AT25DQ321-SH-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DQ321-SH-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-SH-T?
For technical support, including AT25DQ321-SH-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DQ321-SH-T requirements.
6.How does Aetrix verify that AT25DQ321-SH-T is sourced from the original manufacturer or authorized distributors?
All AT25DQ321-SH-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-SH-T meets industry standards.
7.What is the process for return or replacement of AT25DQ321-SH-T?
All AT25DQ321-SH-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25DQ321-SH-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-SH-T part is unused and in its original packaging.
Return procedure for AT25DQ321-SH-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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