My Inquiry
My Account
Renesas AT45DQ321-MHF-T
- Part No.:
- AT45DQ321-MHF-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-UDFN Exposed Pad
- Datasheet:
-
AT45DQ321-MHF-T.pdf
- Description:
- IC FLASH 32MBIT SPI 104MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,995
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT45DQ321-MHF-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 512/528-byte configurable page size - deployed in industrial embedded systems for firmware storage and parameter logging.
For engineers reviewing the AT45DQ321-MHF-T datasheet, AT45DQ321-MHF-T pinout, AT45DQ321-MHF-T application, or AT45DQ321-MHF-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 layouts.
Technical Context
The AT45DQ321-MHF-T implements a dual-SRAM-buffer architecture (512/528 bytes each) enabling concurrent buffer write and main memory reprogramming. It supports SPI modes 0 and 3, RapidS™ high-speed operation, and hardware/software reset control with JEDEC-standard ID read capability.
Its flexible erase hierarchy includes page (512/528 B), block (4 kB), sector (64 kB), and chip-level erasure, with suspend/resume functionality for program/erase operations. Sector protection and permanent lockdown are enforced via dedicated registers and hardware WP pin control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 32 Mbit main array + 1 Mbit extra buffer space - enables separate firmware image and runtime data storage |
| Supply Voltage | 2.3 V to 3.6 V - compatible with low-voltage industrial microcontrollers and battery-backed systems |
| Max SPI Clock Rate | 104 MHz - reduces firmware update time in host-controlled bootloaders |
| Quad-I/O Read Speed | 70 MHz - doubles data throughput vs standard SPI for high-bandwidth configuration reads |
| Page Size Options | 512 or 528 bytes (factory-configurable) - aligns with legacy DataFlash or optimized binary partitioning |
| Ultra-Deep Power-Down | 500 nA typical - extends battery life in always-on sensor nodes during extended sleep cycles |
| Data Retention | 20 years at +85 °C - ensures long-term reliability in unattended industrial deployments |
| Endurance | 100,000 program/erase cycles at -40 °C to +85 °C - supports frequent field-upgrade scenarios |
Pinout & Package
AT45DQ321-MHF-T uses an 8-lead SOIC (0.208" wide) package, RoHS-compliant and green-qualified, with standard SPI signal mapping and hardware write-protect control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable for SPI command decoding; must be held low during full transaction |
| SCK | Serial Clock | Input clock synchronizing all SPI data transfers; supports up to 104 MHz operation |
| MOSI | Master Out Slave In | Serial input for commands, addresses, and write data; supports dual/quad-input buffer writes |
| MISO | Master In Slave Out | Serial output for read data and status; supports dual/quad-output read modes |
| WP | Write Protect | Hardware-enabled sector lock-down control; low = protection active, high = writable |
| HOLD | Pause Transfer | Halts ongoing read/write without deselecting device; enables multi-master arbitration |
| VCC | Power Supply | 2.3–3.6 V single supply; decoupling required per datasheet layout guidelines |
| GND | Ground | Reference return path; 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 reads from active buffer |
| RapidS™ Operation | Enables high-frequency continuous read with reduced setup/hold timing overhead vs legacy SPI |
| Configurable Page Size | Factory-set 512-byte mode simplifies migration from legacy AT45DB series; 528-byte default supports ECC metadata |
| 128-byte OTP Security Register | 64-byte factory UID + 64-byte user-programmable space - supports secure boot key binding and device identity |
| Program/Erase Suspend | Pauses active erase or program to service urgent read requests - critical for real-time logging applications |
| Individual Sector Lockdown | Per-sector hardware freeze prevents accidental or malicious overwrite of protected firmware partitions |
Applications
| Firmware Storage | Industrial Data Logging |
|---|---|
Use Scenario: Storing bootloader, application firmware, and calibration tables in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Nonvolatile code storage with fast Quad-I/O read access during cold boot and field updates. Use Value: 104 MHz SPI and RapidS™ reduce boot time by >35% vs standard SPI flash; sector lockdown prevents corruption of critical bootloader region. | Use Scenario: Capturing sensor readings, event timestamps, and fault logs in remote environmental monitoring stations. IC Role / Device Role / Timing Role: High-endurance sequential write buffer with background erase management for cyclic logging. Use Value: Dual-buffer architecture allows concurrent log buffering and flash reprogramming; 100K-cycle endurance sustains 10-year deployment without wear leveling. |
| Secure Boot Configuration | Medical Device Parameter Storage |
Use Scenario: Holding cryptographic keys, signature verification certificates, and immutable boot policy flags in Class II medical devices. IC Role / Device Role / Timing Role: Tamper-resistant storage with OTP UID and sector lockdown for root-of-trust initialization. Use Value: 128-byte OTP register provides hardware-bound identity; lockdown prevents runtime modification of boot-critical sectors. | Use Scenario: Saving user-adjusted therapy parameters, usage history, and calibration offsets in portable infusion pumps. IC Role / Device Role / Timing Role: Reliable, low-power nonvolatile memory retaining settings across battery swaps and power cycles. Use Value: 500 nA ultra-deep power-down extends battery life >2× vs comparable flash; 20-year data retention meets FDA long-term record requirements. |
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, Quad SPI only (no Dual-I/O), no SRAM buffers | Lacks concurrent buffer operation and RapidS™; lower voltage range limits compatibility with 2.3 V–3.6 V systems | Select when ultra-low voltage operation is required and buffer concurrency is unnecessary |
| Macronix MX25L3233F | 32 Mbit, 2.7–3.6 V supply, standard SPI + QPI, no OTP register or sector lockdown | No hardware write protection freeze; lacks 128-byte OTP security register and individual sector lockdown capability | Select for cost-sensitive industrial controls where advanced security features are not mandated |
Compared with W25Q32JW and MX25L3233F, the AT45DQ321-MHF-T uniquely delivers dual-SRAM buffering for zero-latency firmware updates, factory-configurable page size for legacy migration, and hardware-enforced sector lockdown - making it optimal for safety-critical and long-lifecycle embedded designs requiring both performance and security.
Availability
AT45DQ321-MHF-T is available at Aetrix Electronics and suitable for industrial PLCs, medical device parameter storage, secure boot configuration, and remote environmental data loggers requiring stable component supply across extended product lifecycles.
Supply support for AT45DQ321-MHF-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 industrial, automotive, and infrastructure markets.
The AT45DQ321-MHF-T belongs to Renesas' DataFlash family, engineered specifically for high-reliability embedded systems requiring concurrent read/write, robust security, and extended temperature operation (-40 °C to +105 °C).
FAQ
What is the operating voltage range for the AT45DQ321-MHF-T?
The AT45DQ321-MHF-T operates from 2.3 V to 3.6 V, enabling compatibility with modern low-voltage microcontrollers and battery-powered systems. This range is validated across the full industrial temperature span (-40 °C to +105 °C), and the device maintains specified AC timing and endurance within these limits. The AT45DQ321-MHF-T does not support voltages below 2.3 V - operation outside this window may cause undefined behavior or data corruption.
Does the AT45DQ321-MHF-T support true Quad-I/O read and write operations?
Yes, the AT45DQ321-MHF-T supports Quad-output Read (6Bh opcode) and Quad-input Buffer Write (38h opcode), achieving up to 70 MHz effective data rates. Unlike basic Quad SPI, it also supports Dual-I/O modes and RapidS™ timing acceleration. The AT45DQ321-MHF-T requires explicit Quad Enable command (35h) to activate quad functionality, and its pin mapping (MOSI/MISO shared with IO2/IO3) complies with standard SPI bus sharing conventions.
How does the dual-buffer architecture of the AT45DQ321-MHF-T improve system responsiveness?
The AT45DQ321-MHF-T integrates two independent 512/528-byte SRAM buffers that operate asynchronously from the main flash array. This allows a host processor to write new data into one buffer while simultaneously reading or reprogramming the other - eliminating wait states during firmware updates or log rotation. In real-world use, this concurrency reduces effective write latency by up to 60% compared to single-buffer flash, directly enhancing responsiveness in the AT45DQ321-MHF-T's target applications.
Can the AT45DQ321-MHF-T be used in automotive applications?
The AT45DQ321-MHF-T is qualified for the full industrial temperature range (-40 °C to +105 °C) and meets RoHS, Pb-free, and halide-free requirements, but it is not AEC-Q100 qualified. While it has been deployed in under-hood-adjacent industrial control units, Renesas does not specify automotive-grade reliability metrics (e.g., HTOL, ESD levels per AEC standards) for the AT45DQ321-MHF-T. For certified automotive applications, consult Renesas' automotive-qualified SLC NAND or serial flash portfolio instead of the AT45DQ321-MHF-T.
What security mechanisms does the AT45DQ321-MHF-T provide beyond standard write protection?
Beyond the hardware WP pin, the AT45DQ321-MHF-T offers three layered security features: (1) software-configurable sector protection registers, (2) irreversible sector lockdown (via 3Ah command), freezing protection status permanently, and (3) a 128-byte OTP security register with factory-programmed UID and user-writable space. These mechanisms are independently controllable and survive power cycles - ensuring persistent, hardware-enforced integrity for boot code and sensitive parameters stored in the AT45DQ321-MHF-T.
AT45DQ321-MHF-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-UDFN 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-UDFN (5x6)
AT45DQ321-MHF-T FAQ
1.How can I place an order for AT45DQ321-MHF-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DQ321-MHF-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-MHF-T reliable?
The price and inventory of AT45DQ321-MHF-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-MHF-T is usually 5 days.
3.What payment methods are accepted for AT45DQ321-MHF-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DQ321-MHF-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DQ321-MHF-T?
AT45DQ321-MHF-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DQ321-MHF-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-MHF-T?
For technical support, including AT45DQ321-MHF-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DQ321-MHF-T requirements.
6.How does Aetrix verify that AT45DQ321-MHF-T is sourced from the original manufacturer or authorized distributors?
All AT45DQ321-MHF-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-MHF-T meets industry standards.
7.What is the process for return or replacement of AT45DQ321-MHF-T?
All AT45DQ321-MHF-T units undergo pre-shipment inspection (PSI). If there is an issue with AT45DQ321-MHF-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-MHF-T part is unused and in its original packaging.
Return procedure for AT45DQ321-MHF-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT45DQ321-MHF-T Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
