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Renesas AT25SF321B-MHB-T
- Part No.:
- AT25SF321B-MHB-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-UDFN Exposed Pad
- Datasheet:
-
AT25SF321B-MHB-T.pdf
- Description:
- IC FLASH 32MBIT SPI/QUAD 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:9,057
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Product details
Overview
AT25SF321B-MHB-T from Renesas Electronics is a 32-Mbit SPI serial flash memory IC supporting dual I/O and quad I/O operations, 133 MHz max clock frequency, 2.7–3.6 V single supply, and execute-in-place (XiP) capability for embedded boot and code storage applications. It features 4 kB/32 kB/64 kB block erase, 256-byte page programming, and 1 µA deep power-down current.
For engineers reviewing the AT25SF321B-MHB-T datasheet, AT25SF321B-MHB-T pinout, AT25SF321B-MHB-T application, or AT25SF321B-MHB-T equivalent, key selection criteria include quad-SPI timing compliance (1-4-4, 0-4-4), OTP security register support, SFDP register availability, and industrial temperature range (-40°C to +85°C) operation.
Technical Context
The AT25SF321B-MHB-T implements a flexible SPI interface with hardware-selectable modes (0 and 3), dual-output (1-1-2), dual-I/O (1-2-2), quad-output (1-1-4), and quad-I/O (1-4-4, 0-4-4) read protocols. Its internal architecture includes SRAM data buffers, Y-gating logic, and configurable protection registers enabling both volatile and non-volatile write protection.
Memory organization comprises 1024 × 4 kB blocks, with erasable granularity down to 4 kB, and supports continuous read with 8/16/32/64-byte wrap. The device integrates three 256-byte one-time programmable (OTP) security registers and complies with JEDEC Standard Manufacturer and Device ID and Serial Flash Discoverable Parameters (SFDP) v1.6.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (4 MB), organized as 1024 × 4 kB blocks for granular code/data partitioning |
| Max Clock Frequency | 133 MHz - enables fast XiP execution and high-throughput firmware updates |
| Erase Time (4 kB block) | 55 ms typical - reduces firmware update latency in field-programmable systems |
| Page Program Time | 0.4 ms typical for 1–256 bytes - supports efficient small-data logging and configuration writes |
| Deep Power-Down Current | 1 µA typical - extends battery life in always-on IoT edge nodes and portable devices |
| Data Retention | 20 years - ensures long-term reliability for industrial control firmware and calibration data |
| Endurance | 100,000 program/erase cycles - suitable for frequent OTA update or runtime parameter storage |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade embedded systems without derating |
Pinout & Package
AT25SF321B-MHB-T is packaged in an 8-pad, 5 × 6 × 0.6 mm DFN (Dual Flat No-lead) package with wettable flanks, RoHS-compliant and halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; initiates all commands on high-to-low transition and terminates on low-to-high |
| SCK | Serial Clock | Input clock; latches SI on rising edge, clocks SO on falling edge; supports up to 133 MHz |
| SI (I/O0) | Serial Input / Quad I/O 0 | Primary command/address/data input; becomes I/O0 in dual/quad modes for bidirectional data transfer |
| SO (I/O1) | Serial Output / Quad I/O 1 | Primary data output; becomes I/O1 in dual/quad modes; high-impedance when CS is deasserted |
| WP (I/O2) | Write Protect / Quad I/O 2 | Configurable: write-protection control (when QE=0) or I/O2 in quad mode (when QE=1); internally pulled high |
| HOLD (I/O3) | Hold / Quad I/O 3 | Pauses ongoing SPI transfer without resetting state (when QE=0) or serves as I/O3 in quad mode (QE=1) |
| VCC | Power Supply | 2.7–3.6 V single supply; powers core logic and I/O buffers; requires local decoupling |
| GND | Ground | Reference return path for VCC and all I/O signals; must be low-impedance system ground connection |
Key Features
| Feature | Design Value |
|---|---|
| Quad-SPI with 0-4-4 Continuous Read | Eliminates opcode retransmission overhead, enabling deterministic XiP latency for real-time MCU boot |
| Three 256-byte OTP Security Registers | Stores immutable keys, certificates, or device-unique identifiers for secure boot and firmware authentication |
| Erase/Program Suspend & Resume | Allows host to pause background flash operations (e.g., during interrupt servicing) and resume without data loss |
| User-Definable Memory Protection | Enables hardware-enforced write lock of top/bottom sectors via WP pin or status register bits |
| SFDP Register (v1.6 compliant) | Provides standardized, software-readable parameter table for automatic driver initialization and configuration |
| Low-Power Deep Power-Down Mode | Reduces system standby power by >99% vs. standard standby (13 µA), critical for battery-powered endpoints |
Applications
| Industrial PLC Firmware Storage | IoT Edge Node Configuration |
|---|---|
Use Scenario: Storing firmware images and runtime configuration in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Non-volatile boot memory and persistent parameter store with execute-in-place (XiP) support for deterministic startup. Use Value: 20-year data retention and -40°C to +85°C operation ensure firmware integrity across extended service life and thermal cycling. |
Use Scenario: Holding sensor calibration data, network credentials, and OTA update staging area in battery-powered smart sensors. IC Role / Device Role / Timing Role: Low-power configuration memory with 1 µA deep power-down and fast quad-read for rapid wake-up data access. Use Value: Enables multi-year battery life while supporting secure credential storage via OTP registers and hardware write protection. |
| Medical Diagnostic Device Boot | Automotive Infotainment Code Storage |
Use Scenario: Hosting bootloader and safety-critical application code in portable ultrasound or ECG units requiring regulatory-compliant reliability. IC Role / Device Role / Timing Role: Primary boot flash with 100,000-cycle endurance and JEDEC-standard ID/SFDP for traceable firmware versioning. Use Value: Meets IEC 62304 Class C requirements through verified data retention, erase consistency, and OTP-based secure boot key storage. |
Use Scenario: Storing infotainment OS kernel, UI assets, and map data in automotive head units with AEC-Q100 stress qualification. IC Role / Device Role / Timing Role: High-bandwidth code storage supporting 133 MHz quad-I/O reads to minimize UI latency during navigation rendering. Use Value: 1-4-4 and 0-4-4 read modes deliver >50 MB/s effective throughput, reducing boot time and improving user responsiveness. |
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-IM (32 Mbit, DFN) |
Supports 133 MHz quad-I/O but lacks 0-4-4 continuous read mode and OTP security registers | Lower security assurance for secure boot; no built-in continuous read optimization for XiP latency | Preferred where cost sensitivity outweighs XiP determinism and cryptographic key storage needs |
| Macronix MX25L3233F (32 Mbit, SOIC8) |
Offers 104 MHz max clock, 4 kB sector erase only (no 32/64 kB blocks), and no SFDP v1.6 support | Limited flexibility for large firmware partitions; requires custom driver initialization instead of auto-detection | Selected when legacy SOIC8 footprint compatibility is mandatory and bandwidth requirements are ≤104 MHz |
Compared with Winbond W25Q32JW-IM and Macronix MX25L3233F, the AT25SF321B-MHB-T delivers superior XiP performance via 0-4-4 continuous read, hardware-enforced security with OTP registers, and standardized SFDP-driven driver portability-making it optimal for next-generation secure, low-latency embedded systems.
Availability
AT25SF321B-MHB-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, IoT edge node configuration, medical diagnostic device boot, and automotive infotainment code storage requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AT25SF321B-MHB-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, infrastructure, and IoT applications.
The AT25SF321B-MHB-T belongs to Renesas' AT25SF family of high-performance SPI flash memories engineered for robust, secure, and low-power code storage in mission-critical embedded systems.
FAQ
What is the maximum supported SPI clock frequency for AT25SF321B-MHB-T in quad-I/O mode?
The AT25SF321B-MHB-T supports up to 133 MHz in quad-I/O read modes (1-4-4 and 0-4-4), as specified in Section 13.3 of the datasheet. This enables effective data throughput exceeding 50 MB/s, making AT25SF321B-MHB-T suitable for high-speed execute-in-place (XiP) applications where low-latency instruction fetch is critical.
Does AT25SF321B-MHB-T support execute-in-place (XiP) operation, and what features enable it?
Yes, AT25SF321B-MHB-T explicitly supports XiP via three hardware-optimized features: quad-SPI (1-4-4/0-4-4) for four-bit-per-cycle reads, continuous read mode eliminating opcode overhead, and 133 MHz maximum clock frequency. These reduce instruction fetch latency and make AT25SF321B-MHB-T ideal for direct code execution in resource-constrained MCUs.
How many one-time programmable (OTP) security registers does AT25SF321B-MHB-T include, and what is their size?
The AT25SF321B-MHB-T includes three independent 256-byte one-time programmable (OTP) security registers, accessible via dedicated commands (42h/48h/44h). These registers are used to store immutable cryptographic keys, device identifiers, or secure boot parameters, and once programmed, cannot be erased or rewritten-ensuring tamper-resistant AT25SF321B-MHB-T deployment.
What package type is used for AT25SF321B-MHB-T, and what are its key mechanical features?
AT25SF321B-MHB-T uses an 8-pad, 5 × 6 × 0.6 mm DFN package with wettable flanks, per ordering code "MHB". This RoHS-compliant, halogen-free package supports automated optical inspection (AOI) and provides improved thermal dissipation over SOIC variants, making AT25SF321B-MHB-T well-suited for compact, high-density PCB layouts in industrial and automotive designs.
Can AT25SF321B-MHB-T be configured for hardware write protection, and how is it controlled?
Yes, AT25SF321B-MHB-T supports hardware write protection via the WP pin and status register bits (SRP0/SRP1). When Quad Enable (QE) = 0, asserting WP low locks status registers and selected memory regions. Protection can be applied to the top or bottom portion of the array, and configuration is retained across power cycles when using non-volatile protection settings-enhancing AT25SF321B-MHB-T reliability in unattended systems.
AT25SF321B-MHB-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 - NOR
- Memory Size:
- 32Mbit
- Memory Organization:
- 4M x 8
- Memory Interface:
- SPI - Quad I/O
- Clock Frequency:
- 108 MHz
- Write Cycle Time - Word, Page:
- 50µs, 3ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-UDFN (5x6)
AT25SF321B-MHB-T FAQ
1.How can I place an order for AT25SF321B-MHB-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25SF321B-MHB-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 AT25SF321B-MHB-T reliable?
The price and inventory of AT25SF321B-MHB-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25SF321B-MHB-T is usually 5 days.
3.What payment methods are accepted for AT25SF321B-MHB-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25SF321B-MHB-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25SF321B-MHB-T?
AT25SF321B-MHB-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25SF321B-MHB-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 AT25SF321B-MHB-T?
For technical support, including AT25SF321B-MHB-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25SF321B-MHB-T requirements.
6.How does Aetrix verify that AT25SF321B-MHB-T is sourced from the original manufacturer or authorized distributors?
All AT25SF321B-MHB-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 AT25SF321B-MHB-T meets industry standards.
7.What is the process for return or replacement of AT25SF321B-MHB-T?
All AT25SF321B-MHB-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25SF321B-MHB-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 AT25SF321B-MHB-T part is unused and in its original packaging.
Return procedure for AT25SF321B-MHB-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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