My Inquiry
My Account
Renesas AT45DQ321-MHF2B-T
- Part No.:
- AT45DQ321-MHF2B-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-UDFN Exposed Pad
- Datasheet:
-
AT45DQ321-MHF2B-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-MHF2B-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 real-time data logging.
For engineers reviewing the AT45DQ321-MHF2B-T datasheet, AT45DQ321-MHF2B-T pinout, AT45DQ321-MHF2B-T application, or AT45DQ321-MHF2B-T equivalent, key selection criteria include its dual/quad I/O throughput, ultra-deep power-down current (500 nA), sector lockdown security, 100,000 program/erase cycles at industrial temperature, and SOIC-8 package compatibility with legacy PCB layouts.
Technical Context
The AT45DQ321-MHF2B-T implements a two-buffer architecture (512/528 bytes each) enabling concurrent SRAM buffer write while main array reprogramming occurs. Its command set supports RapidS™ high-speed mode, hardware/software reset, and JEDEC-standard Manufacturer/Device ID read.
It delivers flexible erase granularity - page (512/528 B), block (4 kB), sector (64 kB), and chip-wide - with suspend/resume capability during active program/erase. Sector protection and OTP security register (128 bytes, 64 factory-unique + 64 user-programmable) are implemented via dedicated status and configuration registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 32 Mbit main array + 1 Mbit extra buffer space - supports firmware image storage plus runtime parameter logging without external RAM. |
| 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 Rate | 104 MHz - achieves up to 13 MB/s sequential read in single-I/O mode for fast boot code loading. |
| Dual/Quad-I/O Speed | 70 MHz - delivers up to 35 MB/s (Quad) or 17.5 MB/s (Dual) effective bandwidth for high-throughput data streaming. |
| Page Size | User-configurable 512 or 528 bytes - aligns with standard NAND page formats or optimizes for ECC overhead in safety-critical applications. |
| Power-Down Current | 500 nA ultra-deep power-down - extends battery life in always-on IoT edge nodes during extended sleep intervals. |
| Endurance | 100,000 program/erase cycles (–40 °C to +85 °C) - ensures reliable field operation over 10+ years in industrial control firmware updates. |
| Data Retention | 20 years - meets long-term archival requirements for medical device calibration data and black-box event logs. |
Pinout & Package
AT45DQ321-MHF2B-T uses an 8-lead SOIC (0.208" wide) package per ordering code MHF2B-T, compliant with JEDEC MS-012AC. Pin functions are defined for SPI communication, hardware reset, and write protection.
| 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 data transfers; supports modes 0 and 3 with up to 104 MHz frequency. |
| MOSI | Master Out, Slave In | Serial input for commands, addresses, and write data; supports single/Dual/Quad-input buffer write opcodes. |
| MISO | Master In, Slave Out | Serial output for read data and status/configuration register contents; supports continuous/Dual/Quad-output modes. |
| WP | Write Protect | Hardware-enabled sector lock-down control; low state disables write/erase to protected sectors regardless of software commands. |
| RESET | Hardware Reset | Asynchronous active-low input forcing device into known power-on state; required for recovery after brown-out or initialization failure. |
| HOLD | Hold Function | Pauses ongoing read/write without deselecting CS; maintains internal address pointer for resumed access. |
| VCC / GND | Power / Ground | Single 2.3–3.6 V supply; decoupling capacitor placement near pins critical for stable high-frequency operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual/Quad-I/O Read/Write | Enables 2× or 4× bandwidth vs. standard SPI - reduces firmware update time by up to 75% in Quad mode. |
| Two Independent SRAM Buffers | Allows overlapping buffer write and main memory programming - eliminates idle time during sequential page writes. |
| Program/Erase Suspend/Resume | Permits immediate servicing of high-priority interrupts during long erase operations - essential for real-time deterministic response. |
| 128-byte OTP Security Register | Provides cryptographically secure device identity binding (64-byte factory UID) and tamper-resistant key storage (64-byte user space). |
| Individual Sector Lock-down | Makes selected 64 kB sectors permanently read-only after freeze command - prevents accidental or malicious firmware corruption. |
| Ultra-Deep Power-Down Mode | Reduces current to 500 nA while preserving all register states and memory contents - ideal for energy-harvesting sensor nodes. |
Applications
| Firmware Storage | Data Logging |
|---|---|
Use Scenario: Storing bootloader, application firmware, and configuration tables in industrial PLCs and motor drives. IC Role / Device Role / Timing Role: Non-volatile code storage with rapid sequential read and verified write integrity. Use Value: Enables field-upgradable firmware with 100,000-cycle endurance and 20-year data retention under thermal stress. | Use Scenario: Capturing timestamped sensor readings, error logs, and operational events in remote telemetry units. IC Role / Device Role / Timing Role: High-reliability circular buffer for time-series data with wear-leveling support via flexible erase options. Use Value: Supports 512/528-byte page-aligned writes and suspend/resume to avoid data loss during power interruption. |
| Secure Boot | IoT Edge Node Memory |
Use Scenario: Verifying cryptographic signatures of boot images in medical imaging devices and avionics controllers. IC Role / Device Role / Timing Role: Trusted storage for immutable public keys and signed firmware hashes using OTP security register. Use Value: Prevents unauthorized firmware execution via sector lockdown of boot partition and factory-programmed UID binding. | Use Scenario: Providing persistent memory for BLE/Wi-Fi modules in battery-powered smart meters and asset trackers. IC Role / Device Role / Timing Role: Low-power non-volatile storage supporting deep-sleep wake-up with sub-millisecond resume latency. Use Value: Achieves 500 nA ultra-deep power-down current while retaining full memory state - extends 10-year battery life. |
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, Quad SPI only (no Dual-I/O), no SRAM buffers, 100,000-cycle endurance. | Lacks concurrent buffer/main memory operation and RapidS™ acceleration; requires software-managed wear leveling. | Choose when cost sensitivity outweighs need for dual-buffer overlap or ultra-low power-down current. |
| Macronix MX25L3233F | 32 Mbit, 2.7–3.6 V supply, supports Dual/Quad I/O but no ultra-deep power-down (min 1 µA), no OTP security register. | Higher minimum voltage limits use with 2.5 V systems; lacks factory-unique UID and sector freeze capability. | Prefer where board already operates at 3.3 V and security requirements are limited to software-based sector protection. |
Compared with W25Q32JW and MX25L3233F, the AT45DQ321-MHF2B-T uniquely combines 2.3 V operation, dual independent SRAM buffers, 500 nA ultra-deep power-down, and factory-programmed OTP UID - making it optimal for battery-constrained, safety-certified, and firmware-integrity-critical designs.
Availability
AT45DQ321-MHF2B-T is available at Aetrix Electronics and suitable for industrial control, medical diagnostics, and IoT edge node applications requiring stable component supply across extended product lifecycles.
Supply support for AT45DQ321-MHF2B-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 automotive, industrial, and infrastructure markets.
The AT45DQ321 belongs to Renesas' DataFlash family, designed specifically for high-reliability, low-power, and secure firmware and data storage in mission-critical embedded systems.
FAQ
What is the operating voltage range of the AT45DQ321-MHF2B-T?
The AT45DQ321-MHF2B-T operates from 2.3 V to 3.6 V, enabling direct integration with 2.5 V logic families and eliminating level-shifter requirements in mixed-voltage systems. This wide range supports robust operation across varying battery discharge profiles and power-supply tolerances in portable and industrial equipment. The AT45DQ321-MHF2B-T maintains full functionality-including 104 MHz SPI speed and 500 nA ultra-deep power-down-across this entire voltage window.
Does the AT45DQ321-MHF2B-T support Quad SPI mode?
Yes, the AT45DQ321-MHF2B-T supports Quad-output read (6Bh opcode) and Quad-input buffer write (38h opcode) with a maximum frequency of 70 MHz. It also includes dedicated Quad Enable/Disable commands (35h/36h) that configure the QE bit in the status register. Unlike some competitors, the AT45DQ321-MHF2B-T retains full Dual-I/O backward compatibility and allows seamless switching between single/dual/quad modes without hardware changes.
How does the AT45DQ321-MHF2B-T handle power-loss during write operations?
The AT45DQ321-MHF2B-T mitigates power-loss risk through Program/Erase Suspend/Resume functionality, allowing interruption of long-duration operations (e.g., sector erase) to service urgent interrupts or detect voltage drop. Its two independent SRAM buffers further isolate volatile write staging from main memory, ensuring partial writes do not corrupt committed data. The AT45DQ321-MHF2B-T also features automatic write-protection activation on VCC undervoltage detection per JEDEC JESD22-A123.
What security features are built into the AT45DQ321-MHF2B-T?
The AT45DQ321-MHF2B-T integrates hardware-enforced security including individual sector protection, permanent sector lockdown (freezeable via 32h command), and a 128-byte One-Time Programmable register with 64 bytes factory-programmed with a unique identifier. These features prevent unauthorized firmware modification, enable cryptographic binding of device identity, and meet IEC 62443 and UL 60730 functional safety prerequisites. The AT45DQ321-MHF2B-T implements all protections at the silicon level - independent of host MCU firmware integrity.
Is the AT45DQ321-MHF2B-T pin-compatible with earlier DataFlash devices?
The AT45DQ321-MHF2B-T maintains identical pinout and electrical signaling with prior-generation AT45DBxxxD series in SOIC-8 packaging, including CS, SCK, MOSI, MISO, WP, RESET, HOLD, and power pins. Command-set compatibility is preserved for core read/write/erase functions, though RapidS™ and Quad-enable sequences require updated driver logic. The AT45DQ321-MHF2B-T thus enables drop-in replacement in existing designs while unlocking higher performance and enhanced security.
AT45DQ321-MHF2B-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-MHF2B-T FAQ
1.How can I place an order for AT45DQ321-MHF2B-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DQ321-MHF2B-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-MHF2B-T reliable?
The price and inventory of AT45DQ321-MHF2B-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-MHF2B-T is usually 5 days.
3.What payment methods are accepted for AT45DQ321-MHF2B-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DQ321-MHF2B-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DQ321-MHF2B-T?
AT45DQ321-MHF2B-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DQ321-MHF2B-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-MHF2B-T?
For technical support, including AT45DQ321-MHF2B-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DQ321-MHF2B-T requirements.
6.How does Aetrix verify that AT45DQ321-MHF2B-T is sourced from the original manufacturer or authorized distributors?
All AT45DQ321-MHF2B-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-MHF2B-T meets industry standards.
7.What is the process for return or replacement of AT45DQ321-MHF2B-T?
All AT45DQ321-MHF2B-T units undergo pre-shipment inspection (PSI). If there is an issue with AT45DQ321-MHF2B-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-MHF2B-T part is unused and in its original packaging.
Return procedure for AT45DQ321-MHF2B-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT45DQ321-MHF2B-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…
