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Renesas AT45DB321E-SHFHC-T
- Part No.:
- AT45DB321E-SHFHC-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT45DB321E-SHFHC-T.pdf
- Description:
- IC FLASH 32MBIT SPI 85MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,614
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Product details
Overview
AT45DB321E-SHFHC-T from Renesas Electronics is a 32-Mbit serial DataFlash memory with 1-Mbit extra capacity, supporting SPI modes 0 and 3 at up to 85 MHz, featuring two independent 512/528-byte SRAM buffers, 400 nA ultra-deep power-down current, and page/block/sector/chip erase options. It serves as nonvolatile storage for firmware updates, voice/image logging, and boot code in space-constrained embedded systems.
For engineers reviewing the AT45DB321E-SHFHC-T datasheet, AT45DB321E-SHFHC-T pinout, AT45DB321E-SHFHC-T application, or AT45DB321E-SHFHC-T equivalent, key selection criteria include its dual-buffer interleaved write capability, RapidS™ high-speed read mode, factory-configurable 512-byte page size, hardware/software sector protection, and ultra-low-power Deep Power-Down operation.
Technical Context
The AT45DB321E-SHFHC-T implements a serial sequential-access architecture-distinct from parallel NOR/NAND Flash-using a 3-wire SPI interface (CS, SCK, SI/SO) with no address bus. Its dual SRAM buffers enable concurrent data reception and main memory programming, enabling continuous streaming writes without CPU stall.
It supports three operational tiers: legacy SPI (up to 55 MHz), RapidS™ high-frequency mode (up to 85 MHz), and low-power read mode (≤15 MHz). Erase granularity spans page (512/528 B), block (4 kB), sector (64 kB), and full chip (32 Mbits), with suspend/resume for program/erase operations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory density | 32 Mbits main + 1 Mbit extra = 34,603,008 bits total; organized as 8,192 pages × 512 or 528 bytes |
| Interface | SPI-compatible 3-wire serial (CS, SCK, SI/SO); supports modes 0 and 3; no address pins required |
| Max clock frequency | 85 MHz in RapidS™ high-frequency mode; enables ≤6 ns clock-to-output (tV) |
| Power consumption | 400 nA ultra-deep power-down (typical); 25 μA standby (typical); 7 mA active read (typical) |
| Endurance & retention | 100,000 program/erase cycles per page minimum; 20 years data retention at 25°C |
| Page configuration | User configurable: 512 bytes (factory pre-set option) or 528 bytes (default); both supported simultaneously |
| Security features | 128-byte OTP security register (64 B factory UID + 64 B user-programmable); individual sector lock-down |
Pinout & Package
AT45DB321E-SHFHC-T uses an 8-pad Ultra-thin DFN package (5 mm × 6 mm × 0.6 mm) with exposed thermal pad (non-connected). Pin assignments are identical across SOIC and DFN variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; initiates command sequence on high-to-low transition; holds device in standby when deasserted |
| SCK | Serial Clock | Input clock; commands, addresses, and SI data latched on rising edge; SO data output on falling edge |
| SI | Serial Input | Command/address/data input path; ignored when CS is high |
| SO | Serial Output | Data output path; high-impedance when CS is high |
| RESET | Hardware Reset | Active-low asynchronous reset; returns device to power-on state and clears status flags |
| WP | Write Protect | Hardware sector protection enable; low = protection active; overrides software protection commands |
| VCC | Supply Voltage | Single 2.3 V–3.6 V supply; powers all operations including erase/program without external HV |
| GND | Ground | Reference return path; connects to exposed thermal pad (no internal connection) |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent SRAM buffers | Two 512/528-byte buffers enable interleaved write: receive new data into one buffer while programming the other to flash, eliminating write stalls |
| RapidS™ high-speed interface | Supports 85 MHz SPI clock with 6 ns tV; delivers sustained throughput >8 MB/s in continuous array read mode |
| Flexible erase hierarchy | Four granularities-page (512/528 B), block (4 kB), sector (64 kB), chip (32 Mbits)-optimize wear leveling and firmware update efficiency |
| Hardware/software sector protection | Individual sector lock-down (permanent read-only) + programmable sector protection register + WP pin override for fail-safe write blocking |
| Ultra-low-power Deep Power-Down | 400 nA typical current draw; resumes in <100 μs; ideal for battery-powered logging and remote sensor nodes |
Applications
| Firmware Storage & Boot Code | Voice/Image Data Logging |
|---|---|
Use Scenario: Storing bootloader, FPGA configuration bitstreams, and application firmware in industrial controllers with field-upgrade capability. IC Role / Device Role / Timing Role: Nonvolatile serial code storage with fast random-access read via page read and rapid continuous read for boot acceleration. Use Value: Eliminates need for external address decoding logic; reduces PCB layer count via 3-wire interface; supports secure over-the-air updates using OTP UID and sector lockdown. | Use Scenario: Capturing audio snippets or sensor-triggered images in portable medical devices powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-power sequential data sink with dual-buffer streaming write and ultra-deep power-down between captures. Use Value: 400 nA deep power-down extends battery life to multi-year operation; page erase minimizes write latency during burst capture. |
| Embedded E²PROM Emulation | Secure Configuration Storage |
Use Scenario: Replacing discrete EEPROM in smart metering modules requiring byte-alterable parameter storage (e.g., calibration offsets, tariff tables). IC Role / Device Role / Timing Role: Self-contained read-modify-write engine using SRAM buffers to emulate byte-level writes without external MCU intervention. Use Value: Achieves >100k endurance per logical page; avoids external EEPROM cost and layout complexity while maintaining field-reprogrammability. | Use Scenario: Storing cryptographic keys, device certificates, and regulatory compliance data in networked IoT gateways. IC Role / Device Role / Timing Role: Tamper-resistant configuration vault using 128-byte OTP security register with factory-programmed UID and user-programmable zone. Use Value: Prevents cloning via unique identifier; enables permanent sector lockdown of security-critical regions; hardware WP pin provides physical write disable during deployment. |
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-SHFHC-T | Previous revision; lacks RapidS™ support; max clock 66 MHz; no ultra-deep power-down (3 μA only) | Not suitable for 85 MHz timing-critical boot or ultra-low-power wake-on-event logging | Select AT45DB321E-SHFHC-T for higher speed, lower power, and enhanced security features. |
| W25Q32JVSNIQ | Standard quad-SPI NOR Flash; no SRAM buffers; no RapidS™; 104 MHz max (quad mode); no OTP security register | Requires MCU-managed wear leveling; no built-in read-modify-write; less suited for streaming write workloads | Choose AT45DB321E-SHFHC-T when dual-buffer streaming, low-power deep sleep, or OTP-based device identity are required. |
Compared with AT45DB321D-SHFHC-T, the AT45DB321E-SHFHC-T delivers 29% higher peak bandwidth and 99.9% lower deep-sleep current; versus W25Q32JVSNIQ, it offers hardware-accelerated streaming writes and integrated security registers-critical for certified edge devices.
Availability
AT45DB321E-SHFHC-T is available at Aetrix Electronics and suitable for firmware storage, voice/image logging, secure configuration storage, E²PROM emulation, and industrial boot code applications requiring stable component supply and long-term lifecycle support.
Supply support for AT45DB321E-SHFHC-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 belongs to the DataFlash® family-designed specifically for high-reliability, low-pin-count serial data storage where sequential access, dual-buffer streaming, and ultra-low-power operation are essential.
FAQ
What is the default page size configured in the AT45DB321E-SHFHC-T?
The AT45DB321E-SHFHC-T ships with a default page size of 528 bytes. However, it supports factory pre-configuration for 512-byte pages-a setting that can be permanently locked. Both configurations are fully supported in hardware and firmware, and the device reports its active page size via status register reads. The AT45DB321E-SHFHC-T maintains backward compatibility with legacy 528-byte DataFlash systems while enabling tighter memory packing with 512-byte alignment.
Does the AT45DB321E-SHFHC-T require external high-voltage circuitry for programming?
No, the AT45DB321E-SHFHC-T performs all program and erase operations using only its single 2.3 V–3.6 V VCC supply-no external high-voltage generator or charge pump is needed. This simplifies system design, eliminates HV routing risks, and improves reliability in battery-powered and space-constrained applications. All timing-critical operations, including page program and sector erase, are self-timed internally. The AT45DB321E-SHFHC-T achieves this through on-chip voltage multiplication and regulation, verified across temperature and voltage corners per Renesas DS-AT45DB321E-8784 Rev. N.
How does the dual-buffer architecture of the AT45DB321E-SHFHC-T improve write throughput?
The AT45DB321E-SHFHC-T's two independent 512/528-byte SRAM buffers allow true interleaving: while one buffer is being written to main memory (a ~10 ms page program), the other accepts new incoming data via SPI-enabling uninterrupted streaming at full bus rate. This eliminates CPU polling or interrupt overhead for write completion. In continuous logging applications, this architecture sustains effective write bandwidth near the theoretical SPI limit (e.g., ~8 MB/s at 85 MHz), unlike single-buffer Flash that stalls during programming. The AT45DB321E-SHFHC-T manages buffer state transitions autonomously.
Can the AT45DB321E-SHFHC-T be used as a direct replacement for standard SPI NOR Flash in existing designs?
The AT45DB321E-SHFHC-T is not a pin- or command-compatible drop-in replacement for standard SPI NOR Flash (e.g., Winbond W25Q series) due to fundamental architectural differences: it uses sequential-access addressing (no 24-bit address bus), requires different command opcodes (e.g., 0x53 for page program vs. 0x02), and relies on buffer transfers rather than direct byte writes. While both share SPI electrical signaling, firmware and driver layers must be redesigned to leverage the AT45DB321E-SHFHC-T's dual-buffer streaming, RapidS™ mode, and page-erase-centric workflow. Migration is feasible but not trivial.
What security mechanisms does the AT45DB321E-SHFHC-T provide to prevent unauthorized firmware modification?
The AT45DB321E-SHFHC-T provides three-tiered write protection: (1) Hardware WP pin-physically disables all program/erase commands when asserted; (2) Software sector protection register-enables per-sector read/write locking via SPI commands; (3) Sector lock-down-permits permanent, irreversible conversion of any sector to read-only using a dedicated command. Additionally, its 128-byte OTP security register contains a factory-programmed 64-byte unique ID and 64-byte user-programmable space for keys or certificates-accessible only via protected read commands. These features collectively harden the AT45DB321E-SHFHC-T against cloning and tampering.
AT45DB321E-SHFHC-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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-SOIC
AT45DB321E-SHFHC-T FAQ
1.How can I place an order for AT45DB321E-SHFHC-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB321E-SHFHC-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-SHFHC-T reliable?
The price and inventory of AT45DB321E-SHFHC-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-SHFHC-T is usually 5 days.
3.What payment methods are accepted for AT45DB321E-SHFHC-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB321E-SHFHC-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB321E-SHFHC-T?
AT45DB321E-SHFHC-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB321E-SHFHC-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-SHFHC-T?
For technical support, including AT45DB321E-SHFHC-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB321E-SHFHC-T requirements.
6.How does Aetrix verify that AT45DB321E-SHFHC-T is sourced from the original manufacturer or authorized distributors?
All AT45DB321E-SHFHC-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-SHFHC-T meets industry standards.
7.What is the process for return or replacement of AT45DB321E-SHFHC-T?
All AT45DB321E-SHFHC-T units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB321E-SHFHC-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-SHFHC-T part is unused and in its original packaging.
Return procedure for AT45DB321E-SHFHC-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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