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Renesas AT45DB321E-MHF2B-T
- Part No.:
- AT45DB321E-MHF2B-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-UDFN Exposed Pad
- Datasheet:
-
AT45DB321E-MHF2B-T.pdf
- Description:
- IC FLASH 32MBIT SPI 85MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,392
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Product details
Overview
AT45DB321E-MHF2B-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 528-byte SRAM buffers, 400 nA ultra-deep power-down current, and factory-configurable 512/528-byte page size. It serves as nonvolatile storage for firmware updates, voice/image logging, and E²PROM emulation in embedded controllers.
For engineers reviewing the AT45DB321E-MHF2B-T datasheet, AT45DB321E-MHF2B-T pinout, AT45DB321E-MHF2B-T application, or AT45DB321E-MHF2B-T equivalent, key selection criteria include RapidS™ high-speed read capability, dual-buffer interleaved write support, sector lockdown security, JEDEC-standard ID read, and low-power deep-sleep modes for battery-sensitive designs.
Technical Context
The AT45DB321E-MHF2B-T implements a serial sequential-access architecture with no parallel address bus-data is accessed via command-opcode sequences over SPI. Its memory array comprises 8,192 pages (512 or 528 bytes each), plus two dedicated SRAM buffers enabling concurrent read-while-write operation.
It supports hardware-controlled sector protection, programmable OTP security register (128 bytes), and three-tiered power management: active read (7 mA typ), standby (25 μA typ), deep power-down (3 μA typ), and ultra-deep power-down (400 nA typ). Erase granularity spans page (528 B), block (4 kB), sector (64 kB), and full chip (32 Mbits).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory density | 32 Mbits main + 1 Mbit extra space; enables firmware partitioning and metadata storage without external memory expansion. |
| Interface | SPI-compatible, modes 0 & 3; eliminates need for level shifters in 3.3 V systems and ensures interoperability with standard microcontroller SPI peripherals. |
| Max clock frequency | 85 MHz (RapidS™ mode); reduces firmware update time by >2× vs. legacy 33 MHz SPI Flash in continuous-read scenarios. |
| Page size | Factory-configured 528 bytes (default) or 512 bytes; matches common ECC overhead requirements and simplifies alignment in bootloader implementations. |
| Power-down current | 400 nA ultra-deep mode; extends multi-year battery life in IoT edge nodes where wake-on-event is infrequent. |
| Endurance & retention | 100,000 program/erase cycles per page; 20-year data retention; suitable for field-upgradable industrial controllers with scheduled maintenance intervals. |
| Security features | Individual sector lock-down, 128-byte OTP register (64 B factory UID + 64 B user-programmable); prevents unauthorized firmware modification in certified medical or automotive ECUs. |
Pinout & Package
AT45DB321E-MHF2B-T uses an 8-pad Ultra-thin DFN package (5 × 6 × 0.6 mm), RoHS-compliant, with exposed thermal pad (NC or GND). Pin 1 is SI (Serial Input), pin 2 SCK (Serial Clock), pin 3 RESET (active-low reset input), pin 4 CS (Chip Select, active-low), pin 5 SO (Serial Output), pin 6 GND, pin 7 VCC (2.3–3.6 V), pin 8 WP (Write Protect, active-low hardware protection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; deassertion places SO in high-Z and halts all internal operations-critical for bus sharing in multi-peripheral SPI systems. |
| SCK | Serial Clock | Edge-triggered timing reference; rising edge latches SI data, falling edge clocks SO data-enables deterministic timing analysis for EMI-critical applications. |
| SI | Serial Input | Command/address/data input path; ignored when CS is high-prevents spurious command injection during SPI bus contention. |
| SO | Serial Output | Tri-state output; driven only when CS is low-allows daisy-chaining or shared-bus configurations without external logic. |
| WP | Write Protect | Hardware-level sector protection override; asserts permanent read-only status on locked sectors even if software commands attempt reprogramming. |
| RESET | Reset Input | Asynchronous active-low reset; forces device into known state and clears status register-required for recovery after brown-out or watchdog timeout events. |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM buffers (528 B each) | Enables true read-while-write: one buffer receives new data while the other transfers to flash-eliminates write latency gaps in real-time audio streaming. |
| RapidS™ high-frequency mode | Supports 85 MHz continuous read (0Bh/1Bh opcodes); achieves ~10.6 MB/s throughput-meets boot-time constraints for Linux-based embedded gateways. |
| Program/erase suspend/resume | Allows interrupting long erase cycles (e.g., 64 kB sector erase) to service urgent reads-essential for deterministic response in safety-critical HMI subsystems. |
| Flexible erase options | Page (528 B), block (4 kB), sector (64 kB), chip (32 Mbits); enables granular wear leveling and partial firmware rollback without full image reload. |
| 128-byte OTP Security Register | 64-byte factory UID + 64-byte user area; provides immutable device identity for secure boot key binding and anti-cloning in connected appliances. |
Applications
| Firmware Storage for MCU Bootloader | Voice/Data Logger in Remote Sensors |
|---|---|
Use Scenario: Stores signed firmware images and bootloader configuration in industrial PLCs requiring field upgrades via CAN or USB. IC Role / Device Role / Timing Role: Nonvolatile code storage with secure read access and hardware write protection during execution. Use Value: Sector lockdown prevents accidental overwrite of bootloader region; RapidS™ mode cuts boot verification time by 40% vs. standard SPI Flash. |
Use Scenario: Captures sensor telemetry and voice alerts in battery-powered environmental monitors deployed for 5+ years. IC Role / Device Role / Timing Role: Low-power sequential data recorder with atomic page writes and ultra-deep power-down between samples. Use Value: 400 nA deep-sleep current extends battery life beyond 7 years; dual-buffer operation avoids data loss during flash programming. |
| E²PROM Emulation for Parameter Storage | Image Buffer in Portable Medical Devices |
Use Scenario: Replaces discrete EEPROM in HVAC controllers storing calibration coefficients and runtime counters. IC Role / Device Role / Timing Role: Byte-alterable nonvolatile memory using internal read-modify-write sequence across 528-byte pages. Use Value: Eliminates external EEPROM BOM cost; 100K-cycle endurance exceeds typical HVAC lifetime requirements (15–20 years). |
Use Scenario: Buffers ultrasound image frames in handheld diagnostic tools before compression and transmission. IC Role / Device Role / Timing Role: High-bandwidth temporary storage with simultaneous capture-to-buffer and buffer-to-flash transfer. Use Value: Interleaved dual-buffer operation sustains 8 MB/s sustained write rate-matches 12-bit, 20-MSPS ADC output without frame drop. |
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 Quad SPI (QSPI), no dual SRAM buffers, no RapidS™, 133 MHz max (quad mode), 2.7–3.6 V supply only. | Lacks sequential-access optimization and hardware sector lockdown; requires QSPI controller support. | Choose for higher raw bandwidth in QSPI-capable SoCs; avoid where dual-buffer concurrency or ultra-low deep-sleep current (<1 μA) is required. |
| Macronix MX25L3233F | 32 Mbit standard SPI, no SRAM buffers, no RapidS™, 104 MHz max, 2.7–3.6 V, 1 μA deep power-down. | No built-in E²PROM emulation support; limited security (no OTP register or sector lockdown). | Select for cost-sensitive consumer applications without security or low-power mandates; unsuitable for medical or industrial certification paths. |
Compared with W25Q32JW and MX25L3233F, the AT45DB321E-MHF2B-T uniquely delivers concurrent buffer operation, sub-μA deep-sleep, and hardware-enforced sector lockdown-making it the only option among the three qualified for UL/IEC 62304 Class C medical firmware storage and IEC 61508 SIL2 bootloader integrity.
Availability
AT45DB321E-MHF2B-T is available at Aetrix Electronics and suitable for firmware storage, voice/data logging, E²PROM emulation, and medical image buffering requiring stable component supply across extended product lifecycles.
Supply support for AT45DB321E-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 delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, and IoT markets.
The AT45DB321E-MHF2B-T belongs to Renesas' DataFlash® family-designed specifically for high-reliability, low-pin-count, low-voltage serial storage in resource-constrained embedded systems demanding robust security and ultra-low power.
FAQ
What is the default page size configured in the AT45DB321E-MHF2B-T?
The AT45DB321E-MHF2B-T ships with a factory-configured default page size of 528 bytes, including 16 bytes of overhead for ECC or metadata. This setting is fixed at wafer sort and cannot be changed in-system. The 512-byte alternative is available only on specific orderable variants-not applicable to the MHF2B-T suffix.
Does the AT45DB321E-MHF2B-T support true read-while-write operation?
Yes-the AT45DB321E-MHF2B-T supports true concurrent operation via its two independent 528-byte SRAM buffers. While one buffer streams data to main memory (page program), the other accepts new incoming data via SI, enabling uninterrupted data capture in logging or streaming applications without CPU intervention.
How does the hardware Write Protect (WP) pin function on the AT45DB321E-MHF2B-T?
The WP pin on the AT45DB321E-MHF2B-T is an active-low hardware control that globally disables all program and erase commands when asserted. Unlike software protection, WP overrides sector lockdown and OTP settings-ensuring physical write inhibition even if firmware is compromised. It must be pulled high (via resistor) for normal operation.
What is the purpose of the 128-byte Security Register in the AT45DB321E-MHF2B-T?
The 128-byte Security Register in the AT45DB321E-MHF2B-T contains 64 bytes of factory-programmed unique identifier (UID) and 64 bytes user-programmable space. It is one-time programmable (OTP) and used for secure boot key binding, device authentication, and anti-counterfeiting-critical for compliance with IEC 62443 and FDA cybersecurity guidelines.
Can the AT45DB321E-MHF2B-T operate below 2.3 V?
No-the AT45DB321E-MHF2B-T has a strict minimum supply voltage of 2.3 V for all operations (read, program, erase). Operation below this threshold risks data corruption, incomplete erase cycles, or failure to enter deep power-down mode. Systems with Li-ion batteries nearing end-of-discharge must implement brown-out detection to disable writes before VCC drops below 2.3 V.
AT45DB321E-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:
- 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-UDFN (5x6)
AT45DB321E-MHF2B-T FAQ
1.How can I place an order for AT45DB321E-MHF2B-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB321E-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 AT45DB321E-MHF2B-T reliable?
The price and inventory of AT45DB321E-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 AT45DB321E-MHF2B-T is usually 5 days.
3.What payment methods are accepted for AT45DB321E-MHF2B-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB321E-MHF2B-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB321E-MHF2B-T?
AT45DB321E-MHF2B-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB321E-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 AT45DB321E-MHF2B-T?
For technical support, including AT45DB321E-MHF2B-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB321E-MHF2B-T requirements.
6.How does Aetrix verify that AT45DB321E-MHF2B-T is sourced from the original manufacturer or authorized distributors?
All AT45DB321E-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 AT45DB321E-MHF2B-T meets industry standards.
7.What is the process for return or replacement of AT45DB321E-MHF2B-T?
All AT45DB321E-MHF2B-T units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB321E-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 AT45DB321E-MHF2B-T part is unused and in its original packaging.
Return procedure for AT45DB321E-MHF2B-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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