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

Renesas AT45DB321E-MWHF2B-T

Name: AT45DB321E-MWHF2B-T
Brand: Renesas
SKU: AT45DB321E-MWHF2B-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AT45DB321E-MWHF2B-T

Manufacturer:: Renesas

Category:: Memory

Package:: 8-VDFN Exposed Pad

Datasheet:: AT45DB321E-MWHF2B-T.pdf

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

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Product details

Overview

AT45DB321E-MWHF2B-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 factory-configurable 512-byte page size. It serves as nonvolatile program/data storage in resource-constrained embedded systems requiring high-speed sequential access and robust data protection.

For engineers reviewing the AT45DB321E-MWHF2B-T datasheet, AT45DB321E-MWHF2B-T pinout, AT45DB321E-MWHF2B-T application, or AT45DB321E-MWHF2B-T equivalent, this device delivers verified RapidS™ operation, sector lockdown, OTP security register, JEDEC-standard ID read, and low-power continuous array read - all critical for firmware update, voice logging, and secure boot design.

Technical Context

The AT45DB321E-MWHF2B-T implements a serial Flash architecture with two independent SRAM buffers enabling interleaved write operations: while one buffer accepts incoming data, the other transfers content to main memory, eliminating write latency gaps. Its memory array comprises 8,192 pages (512 or 528 bytes each), organized into 64 sectors of 64 kB, supporting page/block/sector/chip erase with suspend/resume capability.

It uses standard 3-wire SPI (CS/SCK/SI/SO) with hardware reset (RESET) and write-protect (WP) pins; supports legacy and RapidS™ command sets; features status register monitoring; and integrates hardware/software sector protection plus a 128-byte OTP security register (64-byte factory UID + 64-byte user-programmable). All erase/program cycles are fully self-timed without external voltage pumps.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Capacity	32 Mbits (4 MB) main memory + 1 Mbit security space - provides sufficient storage for firmware images, audio logs, or configuration data in compact designs.
Page Size	Factory pre-configured 512 bytes - enables deterministic addressing and simplifies host-side buffer management for fixed-size packet applications.
Max Clock Frequency	85 MHz (RapidS™ mode) - supports high-throughput streaming reads without CPU bottlenecking in real-time data capture systems.
Power-Down Current	400 nA typical ultra-deep power-down - extends battery life in always-on sensor nodes or portable medical devices.
Endurance & Retention	100,000 program/erase cycles per page; 20-year data retention - ensures long-term reliability for field-upgradable industrial controllers.
Operating Voltage	2.3 V to 3.6 V single supply - compatible with modern low-voltage microcontrollers and eliminates need for level shifters.
Interface Standard	SPI modes 0 and 3 compliant - interoperable with ARM Cortex-M, RISC-V, and legacy MCU families without custom driver adaptation.

Pinout & Package

AT45DB321E-MWHF2B-T is packaged in an 8-pad Ultra-thin DFN (5 × 6 × 0.6 mm) with exposed thermal pad (non-connected). Pin functions are validated per Renesas DS-AT45DB321E-8784 Rev. N, Page 7.

Pin/Terminal	Circuit Role	Design Meaning
CS	Chip Select	Active-low enable signal; initiates command sequence on high-to-low transition and terminates on low-to-high - required for all SPI transactions.
SCK	Serial Clock	Master-generated clock; latches SI data on rising edge and clocks SO data on falling edge - defines timing for full-duplex SPI communication.
SI	Serial Input	Command/address/data input line; ignored when CS is deasserted - carries opcodes, addresses, and payload during programming or configuration.
SO	Serial Output	Data output line; tri-stated when CS is high - returns read data, status register contents, or device IDs depending on active command.
RESET	Hardware Reset	Active-low asynchronous reset; forces device into known state and clears internal registers - used for recovery after brown-out or initialization.
WP	Write Protect	Hardware-enabled sector lock-down control; when asserted, prevents modification of protected sectors - complements software protection for tamper resistance.
VCC	Power Supply	2.3–3.6 V primary supply; powers core logic, memory array, and I/O buffers - no auxiliary voltage required for erase/program operations.
GND	Ground	Reference return path for VCC and all I/O signals - must be low-impedance connection to minimize noise coupling during high-speed reads.

Key Features

Feature	Design Value
Dual SRAM Buffers (512/528 B)	Enables concurrent data reception and flash programming - eliminates write stalls in continuous data logging (e.g., audio recording or telemetry streams).
RapidS™ High-Speed Mode	85 MHz clock support with 6 ns clock-to-output delay - reduces read latency by >40% vs. standard SPI Flash in burst-access scenarios.
Program/Erase Suspend/Resume	Allows interrupting background erase/program to service urgent read requests - essential for real-time OS environments with strict response deadlines.
128-byte OTP Security Register	Contains 64-byte factory UID + 64-byte user-programmable space - enables secure device authentication and cryptographic key binding in IoT endpoints.
Individual Sector Lock-Down	Makes any 64 kB sector permanently read-only after freeze command - prevents unauthorized firmware modification in certified medical or automotive ECUs.
Ultra-Deep Power-Down (400 nA)	Reduces quiescent current by 99.9% vs. active mode - extends shelf life and operational runtime in battery-powered remote sensors.

Applications

Firmware Storage	Voice/Data Logging
Use Scenario: Storing bootloader and application firmware in a Cortex-M4-based industrial gateway with over-the-air update capability. IC Role / Device Role / Timing Role: Nonvolatile code storage with fast sequential read and atomic page reprogramming - supports A/B firmware partitioning and safe rollback. Use Value: Dual-buffer interleaving allows background firmware download while executing current image; sector lockdown protects bootloader region from corruption.	Use Scenario: Capturing 16-bit PCM audio from MEMS microphones in a smart speaker during wake-word detection windows. IC Role / Device Role / Timing Role: High-bandwidth sequential write buffer with low-latency read access - sustains 1.4 Mbps sustained write rate using RapidS™ mode. Use Value: 85 MHz interface and 6 ns tV enable real-time playback without DMA underflow; ultra-deep power-down preserves session data between wake cycles.
Secure Boot Configuration	Medical Sensor Data Archiving
Use Scenario: Storing cryptographic keys and signed firmware hashes in a Class II medical infusion pump requiring FDA-compliant secure boot. IC Role / Device Role / Timing Role: Tamper-resistant storage for immutable boot assets - leverages OTP security register and sector lockdown for hardware-enforced integrity. Use Value: Factory-programmed UID binds keys to device identity; freeze-lockdown prevents post-deployment key overwrite - satisfies IEC 62304 traceability requirements.	Use Scenario: Recording ECG waveform snippets triggered by arrhythmia detection in a wearable cardiac monitor operating on coin-cell battery. IC Role / Device Role / Timing Role: Low-power persistent storage with guaranteed 20-year data retention - handles intermittent writes with minimal energy overhead. Use Value: 400 nA deep power-down extends 5-year battery life; page erase granularity minimizes wear on frequently updated patient event logs.

Firmware Storage

Voice/Data Logging

Use Scenario: Storing bootloader and application firmware in a Cortex-M4-based industrial gateway with over-the-air update capability.

IC Role / Device Role / Timing Role: Nonvolatile code storage with fast sequential read and atomic page reprogramming - supports A/B firmware partitioning and safe rollback.

Use Value: Dual-buffer interleaving allows background firmware download while executing current image; sector lockdown protects bootloader region from corruption.

Use Scenario: Capturing 16-bit PCM audio from MEMS microphones in a smart speaker during wake-word detection windows.

IC Role / Device Role / Timing Role: High-bandwidth sequential write buffer with low-latency read access - sustains 1.4 Mbps sustained write rate using RapidS™ mode.

Use Value: 85 MHz interface and 6 ns tV enable real-time playback without DMA underflow; ultra-deep power-down preserves session data between wake cycles.

Secure Boot Configuration

Medical Sensor Data Archiving

Use Scenario: Storing cryptographic keys and signed firmware hashes in a Class II medical infusion pump requiring FDA-compliant secure boot.

IC Role / Device Role / Timing Role: Tamper-resistant storage for immutable boot assets - leverages OTP security register and sector lockdown for hardware-enforced integrity.

Use Value: Factory-programmed UID binds keys to device identity; freeze-lockdown prevents post-deployment key overwrite - satisfies IEC 62304 traceability requirements.

Use Scenario: Recording ECG waveform snippets triggered by arrhythmia detection in a wearable cardiac monitor operating on coin-cell battery.

IC Role / Device Role / Timing Role: Low-power persistent storage with guaranteed 20-year data retention - handles intermittent writes with minimal energy overhead.

Use Value: 400 nA deep power-down extends 5-year battery life; page erase granularity minimizes wear on frequently updated patient event logs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial Flash memory applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AT45DB321D-MWHF2B-T	Previous revision with identical pinout and command set but lower max clock (66 MHz) and no RapidS™ optimization; lacks ultra-deep power-down (3 μA only).	Suitable for cost-sensitive legacy designs where 85 MHz throughput and sub-μA sleep are not required.	Select only if backward compatibility with older AT45DB321D-based firmware/drivers is mandatory and performance headroom is sufficient.
W25Q32JWSSIQ	32-Mbit Quad SPI Flash with 133 MHz QSPI, 4-line interface, and no dual-SRAM buffers; supports XIP but lacks RapidS™ or sector lockdown.	Better suited for execute-in-place code execution and higher aggregate bandwidth, but requires more PCB routing and lacks DataFlash-specific features.	Choose when system demands faster random access or QSPI controller availability outweighs need for sequential streaming efficiency and hardware-level write protection.

Compared with AT45DB321D-MWHF2B-T, the AT45DB321E-MWHF2B-T adds 19 MHz speed headroom and 99.9% deeper sleep current; versus W25Q32JWSSIQ, it trades quad-line complexity for simpler 3-wire control and built-in sequential streaming acceleration - making it optimal for deterministic, low-pin-count, power-aware embedded logging.

Availability

AT45DB321E-MWHF2B-T is available at Aetrix Electronics and suitable for firmware storage, voice/data logging, secure boot configuration, and medical sensor data archiving requiring stable component supply across extended production lifecycles.

Supply support for AT45DB321E-MWHF2B-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 microcontrollers, analog, power, and memory solutions for automotive, industrial, and IoT markets.

The AT45DB321E-MWHF2B-T belongs to Renesas' DataFlash® family, engineered specifically for high-reliability, low-pin-count, sequential-access nonvolatile storage in space- and power-constrained embedded systems.

FAQ

What is the maximum supported SPI clock frequency for AT45DB321E-MWHF2B-T?

The AT45DB321E-MWHF2B-T supports up to 85 MHz in RapidS™ mode (opcodes 0Bh/1Bh), with a guaranteed clock-to-output time (tV) of ≤6 ns. In standard SPI mode (03h/E8h), the maximum is 66 MHz. This high-frequency capability enables real-time streaming applications such as audio buffering and firmware updates without CPU intervention - a key differentiator of the AT45DB321E-MWHF2B-T over earlier revisions.

Does AT45DB321E-MWHF2B-T support true byte-level writes like EEPROM?

No, the AT45DB321E-MWHF2B-T does not support direct byte-level writes. However, it enables EEPROM emulation via a three-step read-modify-write operation using its dual SRAM buffers - allowing bit- or byte-alterability within a 512/528-byte page. This method is implemented entirely in firmware and requires no external components, making the AT45DB321E-MWHF2B-T suitable for parameter storage where true EEPROM density isn't required.

How is data protection implemented in AT45DB321E-MWHF2B-T?

The AT45DB321E-MWHF2B-T implements multi-layer data protection: hardware write-protect (WP pin), software-controlled sector protection (via status register), permanent sector lockdown (freeze command), and a 128-byte OTP security register with 64-byte factory UID. These features operate independently - for example, WP can lock sectors even if software protection is disabled - ensuring robust defense against accidental or malicious corruption in safety-critical AT45DB321E-MWHF2B-T deployments.

What package type is used for AT45DB321E-MWHF2B-T?

The AT45DB321E-MWHF2B-T uses an 8-pad Ultra-thin DFN package measuring 5 mm × 6 mm × 0.6 mm (body), with an exposed thermal pad that is not internally connected. This compact, low-profile package meets IPC-7351B standards and is optimized for high-density PCB layouts in portable and wearable electronics where board space is constrained - a confirmed mechanical specification for the AT45DB321E-MWHF2B-T per Renesas packaging documentation.

Can AT45DB321E-MWHF2B-T be used in place of parallel NOR Flash in existing designs?

The AT45DB321E-MWHF2B-T is not a drop-in replacement for parallel NOR Flash due to its serial interface, sequential access model, and lack of address bus. However, it can replace parallel NOR in new designs targeting reduced pin count, lower power, and simplified layout - provided the host MCU supports SPI and firmware is adapted for page-aligned writes and buffer management. Migration requires driver redesign but yields significant board-area and BOM-cost savings for the AT45DB321E-MWHF2B-T.

AT45DB321E-MWHF2B-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:: 512 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-MWHF2B-T FAQ

1.How can I place an order for AT45DB321E-MWHF2B-T through Aetrix?

Please submit a Request for Quotation (RFQ) for AT45DB321E-MWHF2B-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-MWHF2B-T reliable?

The price and inventory of AT45DB321E-MWHF2B-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-MWHF2B-T is usually 5 days.

3.What payment methods are accepted for AT45DB321E-MWHF2B-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB321E-MWHF2B-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT45DB321E-MWHF2B-T?

AT45DB321E-MWHF2B-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT45DB321E-MWHF2B-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-MWHF2B-T?

For technical support, including AT45DB321E-MWHF2B-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB321E-MWHF2B-T requirements.

6.How does Aetrix verify that AT45DB321E-MWHF2B-T is sourced from the original manufacturer or authorized distributors?

All AT45DB321E-MWHF2B-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-MWHF2B-T meets industry standards.

7.What is the process for return or replacement of AT45DB321E-MWHF2B-T?

All AT45DB321E-MWHF2B-T units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB321E-MWHF2B-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-MWHF2B-T part is unused and in its original packaging.

Return procedure for AT45DB321E-MWHF2B-T:

1.Submit a request within 90 days.

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

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