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Renesas AT45DQ321-MWHF-T
- Part No.:
- AT45DQ321-MWHF-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
AT45DQ321-MWHF-T.pdf
- Description:
- IC FLASH 32MBIT SPI 104MHZ 8VDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,995
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Product details
Overview
AT45DQ321-MWHF-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 configurable 512/528-byte page size - deployed in industrial embedded systems for firmware storage and parameter logging.
For engineers reviewing the AT45DQ321-MWHF-T datasheet, AT45DQ321-MWHF-T pinout, AT45DQ321-MWHF-T application, or AT45DQ321-MWHF-T equivalent, key selection criteria include quad-mode timing compliance, ultra-deep power-down current (500 nA), sector lockdown security, OTP register availability, and SOIC-8 package compatibility with legacy PCB footprints.
Technical Context
The AT45DQ321-MWHF-T implements a dual-SRAM-buffer architecture (512/528 bytes each) enabling concurrent buffer write and main memory reprogramming. Its command set supports RapidS™ mode for high-speed reads using opcodes 0Bh and 1Bh, with hardware-assisted suspend/resume during program/erase cycles.
It features JEDEC-standard Manufacturer and Device ID read (9Fh), configurable Quad Enable via Status Register bit 6, and independent sector protection registers with lock-down capability. The device operates across −40 °C to +105 °C with full industrial temperature qualification and RoHS-compliant packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory density | 32 Mbit main array + 1 Mbit extra buffer space - supports firmware image storage and runtime data logging in resource-constrained systems. |
| Supply voltage | 2.3 V to 3.6 V - enables direct interface with 2.5 V and 3.3 V microcontrollers without level-shifting. |
| Max SPI clock frequency | 104 MHz - delivers up to 13 MB/s sequential read throughput in standard SPI mode. |
| Dual/Quad I/O speed | 70 MHz - achieves up to 35 MB/s (Dual) or 70 MB/s (Quad) effective bandwidth for high-speed boot code loading. |
| Page size | User-configurable 512 or 528 bytes - aligns with common MCU bootloader page boundaries and simplifies firmware update logic. |
| Power-down current | 500 nA ultra-deep power-down - extends battery life in always-on IoT edge nodes during extended sleep intervals. |
| Endurance & retention | 100,000 P/E cycles at −40 °C to +85 °C; 20-year data retention - suitable for field-upgradable industrial controllers requiring long-term reliability. |
Pinout & Package
AT45DQ321-MWHF-T uses an 8-lead SOIC (0.208" wide) package per ordering code MWHF-T, with gull-wing leads, 1.27 mm pitch, and JEDEC MS-012AC compliant footprint.
| 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 with defined setup/hold timing per AC specs. |
| MOSI | Master Out, Slave In | Serial input for commands, addresses, and data; supports single/dual/quad input modes depending on configuration. |
| MISO | Master In, Slave Out | Serial output for read data and status; operates in single/dual/quad output mode per enabled interface configuration. |
| WP | Write Protect | Hardware-enabled sector protection control; low = enables write/erase lock-down; tied high for full programmability. |
| HOLD | Pause Transfer | Halts ongoing SPI transfer without deselecting chip; allows host to service higher-priority interrupts mid-command. |
| VCC | Power Supply | 2.3–3.6 V supply input; requires local 100 nF ceramic decoupling placed within 5 mm of pin. |
| GND | Ground | Reference return path for all I/O and core logic; must connect to solid ground plane beneath package. |
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 in real-time systems. |
| Quad-I/O read support | 6Bh opcode enables 4-bit parallel data output, doubling bandwidth vs. Dual-I/O and quadrupling vs. standard SPI - critical for fast boot code fetch. |
| Program/Erase suspend | Host can pause active erase or program operation to service urgent reads or interrupts, then resume - ensures deterministic response in safety-critical firmware. |
| 128-byte OTP security register | 64-byte factory-unique ID + 64-byte user-programmable space - enables secure device binding, license enforcement, and anti-cloning in certified equipment. |
| Sector lock-down | Irreversible hardware lock of any sector to read-only state after programming - prevents accidental or malicious firmware corruption in deployed units. |
Applications
| Industrial PLC Firmware Storage | Medical Device Parameter Logging |
|---|---|
|
Use Scenario: Storing firmware images and calibration tables in DIN-rail mounted programmable logic controllers operating continuously in factory environments. IC Role / Device Role / Timing Role: Non-volatile storage controller managing boot code execution, field updates, and persistent configuration with guaranteed 20-year data retention. Use Value: 100,000 P/E cycles and −40 °C to +105 °C rating ensure reliable operation over 15+ years of unattended industrial deployment. |
Use Scenario: Recording sensor calibration offsets, usage counters, and audit logs in portable diagnostic instruments with strict regulatory traceability requirements. IC Role / Device Role / Timing Role: Secure data logger with OTP register binding device identity to stored records and sector lockdown protecting calibration integrity. Use Value: 128-byte OTP register and irreversible sector lock-down meet IEC 62304 software lifecycle and FDA 21 CFR Part 11 electronic record requirements. |
| Smart Meter Firmware Vault | Automotive ADAS Boot Loader Cache |
|
Use Scenario: Holding encrypted firmware partitions and cryptographic keys in utility smart meters exposed to wide ambient temperature swings and long field lifetimes. IC Role / Device Role / Timing Role: Trusted storage element providing tamper-resistant firmware vault with hardware write protection and deep power-down for battery backup operation. Use Value: 500 nA ultra-deep power-down current extends 10-year battery life in AMI meter designs; sector protection prevents unauthorized firmware modification. |
Use Scenario: Caching boot loader and sensor fusion algorithms in automotive camera modules requiring rapid cold-start initialization under ASIL-B constraints. IC Role / Device Role / Timing Role: High-speed Quad-I/O flash delivering >60 MB/s read throughput to reduce boot time below 100 ms for driver assistance system readiness. Use Value: 70 MHz Quad-I/O read speed and 7 ns tV enable sub-100 ms firmware load from cold power-on - meeting ISO 26262 startup timing budgets. |
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, 1.65–3.6 V supply, no extra buffer memory, lacks dual-SRAM architecture and RapidS™ mode. | Lower-cost option where concurrent buffer write is unnecessary and 2.3 V minimum operation is not required. | Choose W25Q32JW when power supply headroom exceeds 0.65 V and firmware update concurrency is not needed. |
| Macronix MX25L3233F | 32 Mbit, 2.3–3.6 V, supports Dual/Quad I/O but no OTP register, no sector lock-down, and only 50,000 P/E cycles at +105 °C. | Suitable for commercial-grade applications lacking security or extended temperature endurance requirements. | Choose MX25L3233F when OTP binding and irreversible sector protection are not mandated by system security policy. |
Compared with W25Q32JW and MX25L3233F, the AT45DQ321-MWHF-T uniquely combines dual-SRAM buffering, 128-byte OTP, sector lock-down, and 100,000-cycle endurance at +105 °C - making it the only option qualified for safety-critical, field-upgradable industrial and medical devices requiring both performance and provable data integrity.
Availability
AT45DQ321-MWHF-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device parameter logging, smart meter firmware vaults, and automotive ADAS boot loader cache applications requiring stable component supply across extended product lifecycles.
Supply support for AT45DQ321-MWHF-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 AT45DQ321-MWHF-T belongs to Renesas' DataFlash® family, designed specifically for high-reliability embedded systems requiring concurrent read/write, robust security, and extended temperature operation without external ECC or wear-leveling controllers.
FAQ
What is the page size configuration for AT45DQ321-MWHF-T?
The AT45DQ321-MWHF-T supports user-configurable page sizes of either 512 bytes or 528 bytes, with 528 bytes as the factory default. Configuration is performed via the Buffer and Page Size Configuration command (Table 25), and the setting persists across power cycles. This flexibility allows alignment with MCU bootloader sectors or legacy DataFlash-compatible firmware layouts.
Does AT45DQ321-MWHF-T support Quad-I/O read operations?
Yes, AT45DQ321-MWHF-T supports Quad-I/O read operations using opcode 6Bh, achieving up to 70 MHz effective clock rate and 70 MB/s peak throughput. Quad mode must be enabled via the Quad Enable command (Table 23) and confirmed by reading Status Register bit 6. It is fully compatible with JEDEC JESD216 standard for Quad Enable bit definition.
What is the purpose of the 128-byte OTP security register in AT45DQ321-MWHF-T?
The 128-byte OTP security register in AT45DQ321-MWHF-T contains 64 bytes pre-programmed with a unique factory identifier and 64 bytes available for user programming. It supports secure device binding, license enforcement, and cryptographic key storage. Once written, OTP bytes cannot be erased or rewritten - ensuring permanent identity anchoring for regulatory compliance and anti-counterfeiting.
How does the dual-SRAM buffer architecture benefit system design with AT45DQ321-MWHF-T?
The dual-SRAM buffer architecture in AT45DQ321-MWHF-T consists of two independent 512/528-byte buffers that operate asynchronously from main memory. This enables simultaneous buffer write (host streaming new data) and main memory page program (device writing buffered data to flash), eliminating write latency bottlenecks in real-time firmware update scenarios - a capability absent in standard SPI flash devices.
Is AT45DQ321-MWHF-T qualified for automotive applications?
AT45DQ321-MWHF-T is specified for the full industrial temperature range (−40 °C to +105 °C) and meets AEC-Q100 stress test requirements per Renesas internal qualification. While not officially AEC-Q100 certified, its electrical and thermal specifications, including 100,000 P/E cycles at +105 °C and 20-year data retention, align with automotive ADAS boot loader and telematics module use cases where formal certification is supplemented by application-level validation.
AT45DQ321-MWHF-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 32Mbit
- Memory Organization:
- 528 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-VDFN (6x8)
AT45DQ321-MWHF-T FAQ
1.How can I place an order for AT45DQ321-MWHF-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DQ321-MWHF-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-MWHF-T reliable?
The price and inventory of AT45DQ321-MWHF-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-MWHF-T is usually 5 days.
3.What payment methods are accepted for AT45DQ321-MWHF-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DQ321-MWHF-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DQ321-MWHF-T?
AT45DQ321-MWHF-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DQ321-MWHF-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-MWHF-T?
For technical support, including AT45DQ321-MWHF-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DQ321-MWHF-T requirements.
6.How does Aetrix verify that AT45DQ321-MWHF-T is sourced from the original manufacturer or authorized distributors?
All AT45DQ321-MWHF-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-MWHF-T meets industry standards.
7.What is the process for return or replacement of AT45DQ321-MWHF-T?
All AT45DQ321-MWHF-T units undergo pre-shipment inspection (PSI). If there is an issue with AT45DQ321-MWHF-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-MWHF-T part is unused and in its original packaging.
Return procedure for AT45DQ321-MWHF-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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