My Inquiry
My Account
Renesas AT45DQ321-MHFHK-T
- Part No.:
- AT45DQ321-MHFHK-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-UDFN Exposed Pad
- Datasheet:
-
AT45DQ321-MHFHK-T.pdf
- Description:
- IC FLASH 32MBIT SPI 104MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,093
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT45DQ321-MHFHK-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 parameter logging.
For engineers reviewing the AT45DQ321-MHFHK-T datasheet, AT45DQ321-MHFHK-T pinout, AT45DQ321-MHFHK-T application, or AT45DQ321-MHFHK-T equivalent, key selection criteria include ultra-deep power-down current (500 nA), sector lockdown security, RapidS™ high-speed mode compatibility, and JEDEC-standard Manufacturer/Device ID support.
Technical Context
The AT45DQ321-MHFHK-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™-optimized opcodes (e.g., 0Bh, 6Bh) for high-frequency Quad-output reads up to 70 MHz.
Hardware protection includes dedicated WP pin control, individual sector lock-down (permanent read-only), and 128-byte OTP security register with 64-byte factory-unique ID. Erase granularity spans page (512/528 B), block (4 kB), sector (64 kB), and full chip (32 Mbit), all with suspend/resume capability.
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 parameter storage |
| Supply voltage | 2.3 V to 3.6 V - compatible with low-voltage industrial microcontrollers and battery-backed systems |
| Max SPI frequency | 104 MHz - reduces firmware update time and improves boot speed in host-controlled systems |
| Quad-I/O read speed | 70 MHz - doubles data throughput vs standard SPI, critical for real-time log streaming |
| Power-down current | 500 nA ultra-deep mode - extends battery life in always-on sensor nodes and edge devices |
| Endurance | 100,000 program/erase cycles at -40°C to +85°C - supports frequent field-upgrade scenarios |
| Data retention | 20 years - ensures long-term reliability in unattended infrastructure monitoring applications |
Pinout & Package
AT45DQ321-MHFHK-T uses an 8-pad Ultra-thin DFN package (5 mm × 6 mm × 0.6 mm), RoHS-compliant and optimized for space-constrained industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable for SPI command decoding; supports multi-device daisy-chain or shared-bus configurations |
| SCK | Serial Clock | Input clock synchronized to host MCU; supports up to 104 MHz for high-throughput firmware loading |
| MOSI | Master Out Slave In | Serial data input path for commands, addresses, and write data; supports Dual/Quad-input buffer writes |
| MISO | Master In Slave Out | Serial data output path for read data; operates in Single/Dual/Quad-output modes per configuration |
| WP | Write Protect | Hardware-enabled sector protection override; active-low signal locks selected sectors permanently when asserted |
| HOLD | Hold Input | Pauses ongoing read/write without deselecting device; preserves bus state during host interrupt handling |
| VCC | Power Supply | 2.3–3.6 V single supply; decoupling required per datasheet layout guidelines for stable high-speed operation |
| GND | Ground | Reference return path; must be low-impedance connection to minimize noise in high-frequency SPI signaling |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent SRAM buffers | Enables background programming: receive new firmware into one buffer while erasing/programming main array from the other |
| RapidS™ operation | Reduces instruction latency via optimized opcode set (e.g., 0Bh/6Bh), delivering up to 2× faster sequential reads vs legacy E8h mode |
| User-configurable page size | Factory-set 512-byte or default 528-byte pages - aligns with host filesystem block sizes or legacy DataFlash compatibility requirements |
| Program/Erase suspend/resume | Allows immediate interruption of long erase cycles (e.g., 64 kB sector) to service time-critical host requests, then resume without data loss |
| 128-byte OTP security register | Provides tamper-resistant identity binding: 64-byte factory-unique ID + 64-byte user-programmable keys for secure boot validation |
Applications
| Firmware Storage | Industrial Parameter Logging |
|---|---|
Use Scenario: Storing bootloader, application firmware, and configuration binaries in PLCs and motor drives. IC Role / Device Role / Timing Role: Nonvolatile code storage with fast random-access read and verified write integrity. Use Value: Enables over-the-air updates with dual-buffer overlap, reducing system downtime during field upgrades. |
Use Scenario: Capturing sensor calibration data, operational history, and fault logs in smart meters and HVAC controllers. IC Role / Device Role / Timing Role: High-endurance sequential write buffer with sector-lockdown for regulatory audit trails. Use Value: Guarantees 100,000+ write cycles and 20-year data retention under industrial temperature stress (-40°C to +85°C). |
| Secure Boot Authentication | Edge AI Model Caching |
Use Scenario: Hosting cryptographic keys and signed firmware hashes in medical diagnostic equipment. IC Role / Device Role / Timing Role: Secure storage for immutable root-of-trust elements using OTP lockdown and hardware WP pin. Use Value: Prevents unauthorized firmware modification via permanent sector lockdown and factory-programmed unique ID. |
Use Scenario: Caching inference models and weights for low-latency local AI inference in gateways and robotics. IC Role / Device Role / Timing Role: High-bandwidth Quad-I/O read interface delivering >280 MB/s effective throughput (70 MHz × 4 bits). Use Value: Accelerates model load time by 2× vs standard SPI, enabling sub-100ms cold-start inference on resource-constrained SoCs. |
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, 1.7–3.6 V supply, no dual-SRAM buffers, lacks RapidS™ and ultra-deep power-down (1 µA) | Lower-cost consumer-grade replacement; no sector lockdown or OTP security register | Select when security and ultra-low-power sleep are non-critical, and host supports standard QSPI timing only |
| Macronix MX25L3233F | 32 Mbit, 2.7–3.6 V supply, supports Quad I/O but no Dual-I/O write, no buffer-to-main-memory auto-rewrite | No 512-byte page option; lacks program/erase suspend/resume and 128-byte OTP register | Choose for legacy QSPI designs requiring JEDEC JESD216 compliance but not advanced endurance or security features |
Compared with W25Q32JW and MX25L3233F, the AT45DQ321-MHFHK-T uniquely delivers simultaneous buffer write + main array programming, 500 nA ultra-deep power-down, and factory-programmed OTP ID - making it optimal for secure, battery-sensitive industrial firmware storage where reliability and upgrade flexibility are mandatory.
Availability
AT45DQ321-MHFHK-T is available at Aetrix Electronics and suitable for industrial PLCs, smart metering systems, and medical diagnostics equipment requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AT45DQ321-MHFHK-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 management, and memory solutions for industrial, automotive, and IoT markets.
The AT45DQ321-MHFHK-T belongs to Renesas' DataFlash® family, engineered specifically for high-reliability embedded systems needing robust firmware storage, secure boot support, and low-power operation in harsh environments.
FAQ
What is the operating temperature range for the AT45DQ321-MHFHK-T?
The AT45DQ321-MHFHK-T is rated for the full industrial temperature range of -40 °C to +85 °C, with extended endurance (100,000 program/erase cycles) and data retention (20 years) validated across this range. It also supports operation up to +105 °C with reduced endurance (10,000 cycles), enabling use in thermally demanding enclosures like motor drive cabinets or outdoor telecom units.
Does the AT45DQ321-MHFHK-T support Quad-I/O write operations?
No, the AT45DQ321-MHFHK-T supports Quad-output reads (e.g., 6Bh opcode) and Dual/Quad-input buffer writes, but main memory page programming is limited to Single- or Dual-input modes. Quad-input is only available for loading data into SRAM buffers - not for direct main array writes - as confirmed in Section 7.3 of the DS-AT45DQ321-031 Rev. H datasheet.
How does the dual-SRAM buffer architecture improve system performance in the AT45DQ321-MHFHK-T?
The AT45DQ321-MHFHK-T's two independent 512/528-byte SRAM buffers allow overlapping operations: while one buffer receives new data via SPI, the other can simultaneously transfer its contents to main memory. This eliminates idle time during firmware updates and enables continuous logging without host CPU intervention, directly improving real-time responsiveness in industrial control loops.
Can the AT45DQ321-MHFHK-T be used as a drop-in replacement for older AT45DB series devices?
The AT45DQ321-MHFHK-T maintains pin-to-pin compatibility and command-set backward compatibility with AT45DB321E in SOIC and DFN packages, but requires firmware verification for RapidS™-specific opcodes and updated initialization sequences due to enhanced security registers and Quad-enable behavior. It is not a drop-in replacement for AT45DB variants lacking Dual/Quad-I/O support.
What security mechanisms does the AT45DQ321-MHFHK-T provide beyond standard write protection?
Beyond hardware WP pin and software sector protection, the AT45DQ321-MHFHK-T provides sector lockdown (permanent read-only enforcement), a 128-byte OTP security register with 64-byte factory-unique ID, and freeze-lock capability for lockdown registers. These features prevent post-deployment reprogramming of critical sectors and enable cryptographic binding of firmware images to device identity - capabilities absent in basic SPI flash devices.
AT45DQ321-MHFHK-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:
- 512 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-MHFHK-T FAQ
1.How can I place an order for AT45DQ321-MHFHK-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DQ321-MHFHK-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-MHFHK-T reliable?
The price and inventory of AT45DQ321-MHFHK-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-MHFHK-T is usually 5 days.
3.What payment methods are accepted for AT45DQ321-MHFHK-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DQ321-MHFHK-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DQ321-MHFHK-T?
AT45DQ321-MHFHK-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DQ321-MHFHK-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-MHFHK-T?
For technical support, including AT45DQ321-MHFHK-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DQ321-MHFHK-T requirements.
6.How does Aetrix verify that AT45DQ321-MHFHK-T is sourced from the original manufacturer or authorized distributors?
All AT45DQ321-MHFHK-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-MHFHK-T meets industry standards.
7.What is the process for return or replacement of AT45DQ321-MHFHK-T?
All AT45DQ321-MHFHK-T units undergo pre-shipment inspection (PSI). If there is an issue with AT45DQ321-MHFHK-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-MHFHK-T part is unused and in its original packaging.
Return procedure for AT45DQ321-MHFHK-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT45DQ321-MHFHK-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…
