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Renesas AT45DQ321-MHD-Y
- Part No.:
- AT45DQ321-MHD-Y
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-UDFN Exposed Pad
- Datasheet:
-
AT45DQ321-MHD-Y.pdf
- Description:
- IC FLASH 32MBIT SPI 104MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,879
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Product details
Overview
AT45DQ321-MHD-Y 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 parameter logging.
For engineers reviewing the AT45DQ321-MHD-Y datasheet, AT45DQ321-MHD-Y pinout, AT45DQ321-MHD-Y application, or AT45DQ321-MHD-Y equivalent, key selection criteria include quad-mode timing compliance, ultra-deep power-down current (500 nA), sector lockdown security, JEDEC ID compatibility, and SOIC-8 package suitability for space-constrained PCB layouts.
Technical Context
The AT45DQ321-MHD-Y 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 and includes dedicated opcodes for dual-input buffer write (0x3B), quad-output array read (0x6B), and buffer-to-main-memory page program with built-in erase (0x83).
It features hardware-controlled sector protection via dedicated WP pin and software-configurable sector lockdown, plus a 128-byte OTP security register with factory-programmed unique ID. Memory organization comprises 4,096 pages of 528 bytes (default) or 4,160 pages of 512 bytes (factory-configured), with erase granularity spanning page (528 B), block (4 kB), sector (64 kB), and full chip (32 Mbit).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory density | 32 Mbit main array + 1 Mbit extra buffer space - enables firmware partitioning and runtime data buffering without external RAM. |
| Supply voltage | 2.3 V to 3.6 V - supports direct interface with 2.5 V and 3.3 V logic domains without level shifting. |
| Max SPI 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 boot code loading. |
| Page size | Configurable 512 or 528 bytes - 528-byte default aligns with legacy DataFlash protocol; 512-byte option simplifies address mapping in new designs. |
| Power-down current | 500 nA ultra-deep power-down - extends battery life in always-on IoT edge nodes during extended sleep cycles. |
| Endurance | 100,000 program/erase cycles at -40 °C to +85 °C - suitable for frequent field-upgrade applications like metering and telemetry. |
| Data retention | 20 years - ensures long-term reliability for industrial control firmware and calibration data storage. |
Pinout & Package
AT45DQ321-MHD-Y uses an 8-lead SOIC (0.208" wide) package per ordering code MHD-Y, compliant with JEDEC MS-012AA. Pin functions are electrically and mechanically defined for SPI bus operation with hardware write protection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable for SPI command decoding; must be asserted before SCK edge to initiate valid transaction. |
| SCK | Serial Clock | Input clock synchronizing all SPI transfers; supports up to 104 MHz with tV ≤ 7 ns clock-to-output timing. |
| MOSI | Master Out Slave In | Serial input for commands, addresses, and data; supports standard, dual-input, and quad-input write modes. |
| MISO | Master In Slave Out | Serial output for read data and status; supports continuous, dual-output, and quad-output read protocols. |
| WP | Write Protect | Hardware-enabled sector protection; low state locks protected sectors against accidental program/erase. |
| HOLD | Hold Input | Pauses ongoing SPI transfer without deselecting device; maintains internal state during multi-master arbitration. |
| VCC | Power Supply | 2.3–3.6 V supply; decoupling capacitor required within 10 mm of pin for stable high-frequency operation. |
| GND | Ground | Reference for all I/O and internal circuitry; separate analog/digital ground not required due to integrated design. |
Key Features
| Feature | Design Value |
|---|---|
| Dual/Quad I/O support | Enables 2× or 4× read/write bandwidth vs. standard SPI - reduces boot time in microcontroller-based systems. |
| Two independent SRAM buffers | Allows overlapping data reception into one buffer while programming the other into flash - eliminates write latency stalls. |
| User-configurable page size | Factory-set 512-byte or default 528-byte pages - simplifies migration from legacy AT45DB series or alignment with FAT filesystem clusters. |
| Program/Erase suspend/resume | Permits interrupt-driven background writes - critical for real-time systems requiring deterministic response to external events. |
| 128-byte OTP security register | 64-byte factory-unique ID + 64-byte user-programmable space - supports secure device authentication and license binding. |
| Ultra-deep power-down mode | 500 nA standby current - meets stringent energy budgets for battery-powered wireless sensor nodes. |
Applications
| Firmware Storage | Industrial Data Logging |
|---|---|
Use Scenario: Storing bootloader, application firmware, and configuration tables in a microcontroller-based PLC. IC Role / Device Role / Timing Role: Non-volatile firmware repository with rapid Quad-I/O read access for fast cold-boot recovery. Use Value: 70 MB/s Quad-read throughput reduces boot time by >60% vs. standard SPI flash; 20-year data retention ensures firmware integrity over product lifetime. |
Use Scenario: Capturing sensor readings, error logs, and calibration history in a smart flow meter operating at -40 °C to +85 °C. IC Role / Device Role / Timing Role: High-endurance parameter storage with page-erase flexibility for cyclic overwrite of timestamped records. Use Value: 100,000 program/erase cycles and 528-byte page size match typical log-entry sizes; sector lockdown prevents corruption of calibration sectors. |
| Secure Boot Authentication | Edge AI Model Caching |
Use Scenario: Verifying digital signatures of firmware images prior to execution in medical diagnostic equipment. IC Role / Device Role / Timing Role: Secure key and certificate store using OTP security register and hardware write protection. Use Value: Factory-programmed 64-byte unique ID enables cryptographic binding; sector lockdown makes root-of-trust keys permanently read-only. |
Use Scenario: Caching inference models and weights on a battery-powered predictive maintenance gateway. IC Role / Device Role / Timing Role: Low-power, high-bandwidth model storage supporting on-demand load during inference bursts. Use Value: 500 nA ultra-deep power-down extends battery life between model updates; Quad-I/O read accelerates weight loading to neural accelerator. |
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, 1.8 V supply, no dual/quad buffer write, no OTP register, 100 µA deep power-down | Lacks concurrent buffer operation and ultra-low-power modes; suited for cost-sensitive consumer apps | Choose W25Q32JW only if 1.8 V operation is mandatory and buffer overlap functionality is unnecessary. |
| Macronix MX25L3233F | 32 Mbit, 2.7–3.6 V supply, supports Quad I/O but no RapidS™, no sector lockdown, 1 µA deep power-down | No hardware-enforced sector lock-down or ultra-deep power-down; limited security for regulated environments | Select MX25L3233F when Quad-I/O speed suffices and advanced security features are not required. |
Compared with W25Q32JW and MX25L3233F, the AT45DQ321-MHD-Y uniquely combines dual-SRAM buffering, 500 nA ultra-deep power-down, and factory-programmed OTP ID - making it optimal for industrial firmware storage where concurrent operation, energy efficiency, and traceability are critical.
Availability
AT45DQ321-MHD-Y is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, and battery-powered IoT gateways requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AT45DQ321-MHD-Y 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-MHD-Y belongs to Renesas' DataFlash family, designed specifically for high-reliability embedded applications demanding concurrent read/write, flexible erase granularity, and robust security features.
FAQ
What is the default page size configured in the AT45DQ321-MHD-Y?
The AT45DQ321-MHD-Y ships with a default page size of 528 bytes, compatible with legacy DataFlash protocols. It can be factory pre-configured for 512-byte pages upon order - confirmed in DS-AT45DQ321-031 Rev. H, Section 12 and Table 35–36. This setting is fixed per unit and cannot be changed in-system.
Does the AT45DQ321-MHD-Y support true Quad-SPI (QSPI) mode with four data lines bidirectionally?
Yes, the AT45DQ321-MHD-Y supports Quad-output Read (0x6B opcode) and Quad-input Buffer Write (0x32 opcode), using MOSI/MISO pins in time-multiplexed quad mode. It does not implement x4 I/O in the same cycle as standard QSPI peripherals but achieves equivalent bandwidth via RapidS™-enhanced timing per Section 5.1 and Table 30.
How is the 128-byte OTP security register structured in the AT45DQ321-MHD-Y?
The AT45DQ321-MHD-Y's OTP security register contains 128 bytes: bytes 0–63 are factory-programmed with a unique device identifier and cannot be altered; bytes 64–127 are user-programmable once and locked permanently after programming. Access requires specific unlock sequences per Section 9.2 and Table 19.
Can the AT45DQ321-MHD-Y operate across the full industrial temperature range without derating?
Yes, the AT45DQ321-MHD-Y is fully specified for -40 °C to +85 °C operation with 100,000 program/erase cycles and 20-year data retention. It also supports extended temperature (-40 °C to +105 °C) with reduced endurance (10,000 cycles), as documented in Section 19.5 and Table 42.
What package type does the AT45DQ321-MHD-Y use, and is it lead-free?
The AT45DQ321-MHD-Y uses an 8-lead SOIC (0.208" wide) package, designated by ordering code "MHD-Y". It is green, Pb/Halide-free, and RoHS compliant per Section 1 and Table 44, with JEDEC MS-012AA mechanical dimensions and solder profile compatibility.
AT45DQ321-MHD-Y Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-UDFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Discontinued at Digi-Key
- 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:
- 2.5V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-UDFN (5x6)
AT45DQ321-MHD-Y FAQ
1.How can I place an order for AT45DQ321-MHD-Y through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DQ321-MHD-Y 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-MHD-Y reliable?
The price and inventory of AT45DQ321-MHD-Y are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DQ321-MHD-Y is usually 5 days.
3.What payment methods are accepted for AT45DQ321-MHD-Y?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DQ321-MHD-Y transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DQ321-MHD-Y?
AT45DQ321-MHD-Y orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DQ321-MHD-Y 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-MHD-Y?
For technical support, including AT45DQ321-MHD-Y datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DQ321-MHD-Y requirements.
6.How does Aetrix verify that AT45DQ321-MHD-Y is sourced from the original manufacturer or authorized distributors?
All AT45DQ321-MHD-Y 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-MHD-Y meets industry standards.
7.What is the process for return or replacement of AT45DQ321-MHD-Y?
All AT45DQ321-MHD-Y units undergo pre-shipment inspection (PSI). If there is an issue with AT45DQ321-MHD-Y, 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-MHD-Y part is unused and in its original packaging.
Return procedure for AT45DQ321-MHD-Y:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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