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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Renesas AT45DB321E-MWHF-T

Name: AT45DB321E-MWHF-T
Brand: Renesas
SKU: AT45DB321E-MWHF-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AT45DB321E-MWHF-T

Manufacturer:: Renesas

Category:: Memory

Package:: 8-VDFN Exposed Pad

Datasheet:: AT45DB321E-MWHF-T.pdf

Description:: IC FLASH 32MBIT SPI 85MHZ 8VDFN

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Product details

Overview

AT45DB321E-MWHF-T from Renesas Electronics is a 32-Mbit serial DataFlash memory with extra 1-Mbit security space, supporting SPI modes 0 and 3 at up to 85 MHz, featuring dual 512/528-byte SRAM buffers, 400 nA ultra-deep power-down current, and hardware/software sector protection - used in embedded firmware storage and secure boot applications.

For engineers reviewing the AT45DB321E-MWHF-T datasheet, AT45DB321E-MWHF-T pinout, AT45DB321E-MWHF-T application, or AT45DB321E-MWHF-T equivalent, key selection criteria include page size configurability (512 vs. 528 bytes), RapidS™ high-speed read capability, buffer-to-main-memory program with built-in erase, sector lockdown permanence, and JEDEC-standard ID read compatibility.

Technical Context

The AT45DB321E-MWHF-T implements a serial sequential-access architecture with two independent SRAM buffers enabling interleaved write operations while main memory pages are being programmed or erased. Its command set supports continuous array reads (legacy E8h, RapidS 0Bh/1Bh), low-power reads (01h), and read-modify-write via buffer transfer.

It uses a 3-wire SPI interface (CS, SCK, SI/SO) with no address bus, relying on internal addressing counters and opcode-driven command sequences. Page size is factory-configurable (512 or 528 bytes), and all program/erase cycles are self-timed without external voltage boosting - critical for single-supply 2.3–3.6 V embedded systems requiring deterministic timing and low EMI.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory capacity	32 Mbits (34,603,008 bits) organized as 8,192 pages × 512/528 bytes - enables compact firmware image storage with byte-alterable emulation via buffer-assisted read-modify-write.
Interface speed	Up to 85 MHz clock rate (RapidS™ mode); tV ≤ 6 ns clock-to-output - supports real-time streaming of audio/video data without CPU polling overhead.
Power consumption	400 nA ultra-deep power-down (typical); 7 mA active read current (typical) - extends battery life in always-on IoT edge nodes and portable medical devices.
Erase granularity	Page (512/528 B), block (4 kB), sector (64 kB), chip (32 Mbit) - allows fine-grained firmware update partitioning and wear leveling across application code, config, and logs.
Data retention & endurance	20 years retention; ≥100,000 program/erase cycles per page - meets industrial-grade reliability requirements for unattended field deployments.
Security features	128-byte OTP security register (64-byte factory UID + 64-byte user-programmable); sector lockdown makes protected sectors permanently read-only - satisfies secure boot root-of-trust and anti-cloning requirements.
Operating voltage	2.3 V to 3.6 V single supply - interoperable with modern low-voltage MCUs (e.g., ARM Cortex-M0+/M4) without level-shifting circuitry.

Pinout & Package

AT45DB321E-MWHF-T is packaged in an 8-pad Ultra-thin DFN (5 × 6 × 0.6 mm) with exposed thermal pad (NC or GND). Pin functions are defined for SPI-compatible 3-wire serial communication with chip select control and hardware reset.

Pin/Terminal	Circuit Role	Design Meaning
CS	Chip Select	Active-low enable signal; rising edge terminates ongoing commands and places SO in high-Z - enables multi-device SPI bus sharing with daisy-chained or parallel CS routing.
SCK	Serial Clock	Master-generated clock; data latched on rising edge (SI), output shifted on falling edge (SO) - defines timing margins for PCB trace length matching and jitter tolerance.
SI	Serial Input	Command/address/data input path; ignored when CS is high - eliminates need for tri-state logic or bus contention management in host MCU firmware.
SO	Serial Output	Data output path; high-impedance when CS is deasserted - allows direct connection to shared SPI MISO lines without external pull-ups or switches.
RESET	Hardware Reset	Active-low asynchronous reset; forces device into known state and clears status register - required for safe recovery after brown-out or watchdog timeout events.
WP	Write Protect	Hardware-enabled sector protection override; low = protection enabled - provides fail-safe lock against accidental firmware corruption during field updates.
VCC	Power Supply	2.3–3.6 V core supply; powers all logic, memory, and I/O - compatible with Li-ion/Li-Po battery rails and buck-boost regulators in portable designs.
GND	Ground	Reference return path for VCC and I/O signals; bottom thermal pad may be connected to GND for improved thermal dissipation - reduces thermal resistance in sealed enclosures.

Key Features

Feature	Design Value
Dual SRAM buffers (512/528 bytes each)	Enables concurrent data reception in one buffer while programming the other to main memory - eliminates write latency stalls in continuous data logging (e.g., sensor fusion streams).
RapidS™ high-frequency read mode	Supports 0Bh/1Bh opcodes at up to 85 MHz - delivers >10 MB/s sustained read throughput for fast boot image loading or firmware patch application.
User-configurable page size	Factory-set to 528 bytes (default) or 512 bytes - aligns with legacy EEPROM emulation protocols or optimizes density for fixed-size packet storage (e.g., CAN FD frames).
Program/erase suspend/resume	Allows interrupting long erase cycles (e.g., sector erase) to service time-critical reads - essential for real-time OS environments where flash operations must not block task scheduling.
Individual sector lock-down	Permanently disables write/erase access to any sector via OTP register - enforces immutable bootloader or cryptographic key storage in certified safety-critical systems (IEC 61508 SIL2+).
JEDEC Manufacturer & Device ID	Standard 9Fh opcode returns unique 2-byte manufacturer ID (0x1F) and 2-byte device ID (0x27) - enables automated BOM validation and supply-chain authenticity verification in production test fixtures.

Applications

Firmware Storage	Secure Boot Loader
Use Scenario: Storing MCU application firmware images in resource-constrained industrial controllers with limited PCB area. IC Role / Device Role / Timing Role: Non-volatile sequential-access memory providing boot code and runtime configuration data via SPI interface. Use Value: Dual-buffer architecture enables background firmware updates without halting system operation; 20-year data retention ensures field longevity.	Use Scenario: Hosting signed bootloader code and public key certificates in medical diagnostic equipment requiring FDA-compliant traceability. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for immutable boot assets with hardware-enforced read-only lockdown. Use Value: Sector lockdown prevents unauthorized modification; 128-byte OTP register stores unique device identity and cryptographic keys.
Data Logging Buffer	Audio/Video Streaming Cache
Use Scenario: Capturing timestamped sensor readings from environmental monitoring nodes powered by energy harvesting. IC Role / Device Role / Timing Role: Low-power sequential memory acting as circular buffer for burst-mode acquisition before wireless upload. Use Value: 400 nA ultra-deep power-down extends battery life to multi-year intervals; page-erase granularity minimizes wear during frequent small writes.	Use Scenario: Caching compressed audio frames in voice-controlled smart home hubs with real-time playback requirements. IC Role / Device Role / Timing Role: High-speed serial Flash delivering continuous read throughput via RapidS™ mode for glitch-free streaming. Use Value: 85 MHz interface and 6 ns tV support sub-millisecond frame fetch; dual buffers allow seamless buffer switching during playback.

Firmware Storage

Secure Boot Loader

Use Scenario: Storing MCU application firmware images in resource-constrained industrial controllers with limited PCB area.

IC Role / Device Role / Timing Role: Non-volatile sequential-access memory providing boot code and runtime configuration data via SPI interface.

Use Value: Dual-buffer architecture enables background firmware updates without halting system operation; 20-year data retention ensures field longevity.

Use Scenario: Hosting signed bootloader code and public key certificates in medical diagnostic equipment requiring FDA-compliant traceability.

IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for immutable boot assets with hardware-enforced read-only lockdown.

Use Value: Sector lockdown prevents unauthorized modification; 128-byte OTP register stores unique device identity and cryptographic keys.

Data Logging Buffer

Audio/Video Streaming Cache

Use Scenario: Capturing timestamped sensor readings from environmental monitoring nodes powered by energy harvesting.

IC Role / Device Role / Timing Role: Low-power sequential memory acting as circular buffer for burst-mode acquisition before wireless upload.

Use Value: 400 nA ultra-deep power-down extends battery life to multi-year intervals; page-erase granularity minimizes wear during frequent small writes.

Use Scenario: Caching compressed audio frames in voice-controlled smart home hubs with real-time playback requirements.

IC Role / Device Role / Timing Role: High-speed serial Flash delivering continuous read throughput via RapidS™ mode for glitch-free streaming.

Use Value: 85 MHz interface and 6 ns tV support sub-millisecond frame fetch; dual buffers allow seamless buffer switching during playback.

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 W25Q32JVSSIQ	32-Mbit quad SPI NOR Flash; no SRAM buffers; supports QSPI x4 mode (up to 133 MHz); lacks RapidS™, sector lockdown, or OTP security register.	Better raw bandwidth for code XIP; unsuitable for E2PROM emulation or secure key storage due to missing buffer and lockdown features.	Select when high-speed execute-in-place (XIP) is prioritized over secure firmware update flexibility.
Microchip SST26VF032B-104V/SN	32-Mbit serial Quad I/O Flash; includes flexible erase (4/32/64 kB), but no dual SRAM buffers or OTP security register; supports 104 MHz QPI.	Lower power than AT45DB321E-MWHF-T in active mode (15 mA vs. 7 mA), but lacks ultra-deep power-down (400 nA) and hardware write protect pin.	Select for cost-sensitive consumer electronics where security and ultra-low standby power are secondary to read speed and footprint.

Compared with W25Q32JVSSIQ and SST26VF032B-104V/SN, the AT45DB321E-MWHF-T uniquely combines dual SRAM buffers for seamless streaming, hardware-enforced sector lockdown for security-critical boot, and 400 nA ultra-deep power-down - making it optimal for battery-powered, safety-certified, or firmware-updatable embedded systems.

Availability

AT45DB321E-MWHF-T is available at Aetrix Electronics and suitable for firmware storage, secure boot loader implementation, and data logging applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AT45DB321E-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 automotive, industrial, and IoT markets.

The AT45DB321E-MWHF-T belongs to the DataFlash® family, designed specifically for high-reliability, low-pin-count serial memory applications where sequential access, buffer-assisted streaming, and hardware security are essential - not general-purpose NOR/NAND replacement.

FAQ

What is the default page size configuration for the AT45DB321E-MWHF-T?

The AT45DB321E-MWHF-T is factory-configured with a default page size of 528 bytes, supporting standard DataFlash® protocol compatibility. It can be reconfigured to 512 bytes via buffer configuration commands (03h/04h opcodes), enabling alignment with legacy EEPROM emulation or fixed-packet storage schemes. This setting persists across power cycles and affects all read/write/erase addressing.

Does the AT45DB321E-MWHF-T support true random-access reads like parallel NOR Flash?

No, the AT45DB321E-MWHF-T is a sequential-access device and does not support true random-address reads. All reads require either continuous array access (with auto-incrementing address counter) or page-aligned main memory reads. Random byte access is only possible via buffer transfer followed by buffer read - a three-step process (page-to-buffer → buffer-read → modify → buffer-to-page) that emulates EEPROM behavior but incurs latency.

How does the AT45DB321E-MWHF-T handle power loss during a program or erase operation?

The AT45DB321E-MWHF-T uses self-timed internal algorithms with built-in error detection. If power is lost mid-operation, the device enters an undefined state upon next power-up; the status register will indicate BUSY=1 until completion or timeout. Recovery requires issuing a software reset (99h) followed by status polling. No data corruption occurs in already-programmed pages, but the interrupted page remains invalid and must be reprogrammed.

Can the AT45DB321E-MWHF-T be used as a direct replacement for standard SPI NOR Flash in existing designs?

No - the AT45DB321E-MWHF-T is not pin-compatible or command-compatible with standard SPI NOR Flash. It uses a distinct DataFlash® command set (e.g., D2h for page read, D4h/D6h for buffer read), lacks address pins, and relies on opcode-driven sequential access. Migration requires firmware-level driver redesign and layout changes to accommodate its 3-wire interface and absence of HOLD/WP pin multiplexing found in NOR devices.

What is the purpose of the 128-byte Security Register in the AT45DB321E-MWHF-T?

The 128-byte Security Register in the AT45DB321E-MWHF-T contains 64 bytes pre-programmed with a unique factory-assigned identifier and 64 bytes user-programmable for keys, certificates, or calibration data. It is One-Time Programmable (OTP), meaning each byte can be written only once. This register supports secure boot chain integrity, device authentication, and anti-counterfeiting - accessed via dedicated 77h opcode and protected by hardware write disable after programming.

AT45DB321E-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:: 85 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)

AT45DB321E-MWHF-T FAQ

1.How can I place an order for AT45DB321E-MWHF-T through Aetrix?

Please submit a Request for Quotation (RFQ) for AT45DB321E-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 AT45DB321E-MWHF-T reliable?

The price and inventory of AT45DB321E-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 AT45DB321E-MWHF-T is usually 5 days.

3.What payment methods are accepted for AT45DB321E-MWHF-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB321E-MWHF-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT45DB321E-MWHF-T?

AT45DB321E-MWHF-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT45DB321E-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 AT45DB321E-MWHF-T?

For technical support, including AT45DB321E-MWHF-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB321E-MWHF-T requirements.

6.How does Aetrix verify that AT45DB321E-MWHF-T is sourced from the original manufacturer or authorized distributors?

All AT45DB321E-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 AT45DB321E-MWHF-T meets industry standards.

7.What is the process for return or replacement of AT45DB321E-MWHF-T?

All AT45DB321E-MWHF-T units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB321E-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 AT45DB321E-MWHF-T part is unused and in its original packaging.

Return procedure for AT45DB321E-MWHF-T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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