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Renesas AT25SF321B-SHB-T
- Part No.:
- AT25SF321B-SHB-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25SF321B-SHB-T.pdf
- Description:
- IC FLASH 32MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,401
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Product details
Overview
AT25SF321B-SHB-T from Renesas Electronics is a 32-Mbit SPI serial flash memory IC supporting dual I/O and quad I/O operations, operating at 2.7–3.6 V with up to 133 MHz clock frequency. It enables execute-in-place (XiP) code execution, features 4 kB/32 kB/64 kB block erase (55/120/200 ms typ), 0.4 ms page program, and 100,000 program/erase cycles for embedded boot and firmware storage in industrial controllers and IoT edge devices.
For engineers reviewing the AT25SF321B-SHB-T datasheet, AT25SF321B-SHB-T pinout, AT25SF321B-SHB-T application, or AT25SF321B-SHB-T equivalent, key selection criteria include quad-SPI timing compliance (1-4-4, 0-4-4), deep power-down current (1 µA), OTP security registers, SFDP register support, and JEDEC-standard device ID read capability.
Technical Context
The AT25SF321B-SHB-T implements a flexible SPI interface supporting modes 0 and 3, with configurable 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 memory array uses 4-kbyte erase blocks organized across 1024 blocks, enabling granular firmware updates without full-chip erasure.
Internal control logic integrates write protection via WP pin and status register bits (SRP0/SRP1), suspend/resume for concurrent program/erase operations, and three 256-byte one-time programmable security registers. The device supports continuous read wrap (8/16/32/64-byte) and Serial Flash Discoverable Parameters (SFDP) for host auto-configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (4 MB) - sufficient for full MCU boot image + application firmware in space-constrained designs |
| Supply Voltage | 2.7 V – 3.6 V - compatible with standard 3.3 V system rails and tolerant of brown-out conditions |
| Max Clock Frequency | 133 MHz - enables high-throughput XiP execution and fast firmware loading over SPI |
| Erase Time (4 kB block) | 55 ms typical - allows rapid field firmware patching with minimal downtime |
| Page Program Time | 0.4 ms typical - supports efficient runtime parameter storage and logging |
| Endurance | 100,000 cycles - validated for frequent OTA update scenarios in industrial gateways |
| Data Retention | 20 years - ensures long-term reliability in unattended infrastructure deployments |
Pinout & Package
AT25SF321B-SHB-T is packaged in an 8-pin, 208-mil wide SOIC (Small Outline Integrated Circuit) with standard lead pitch and RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must transition low-to-high to complete commands and enter standby mode |
| SCK | Serial Clock | Input clock driving all SPI transactions; data latched on rising edge, output shifted on falling edge |
| SI (I/O0) | Serial Input / Quad I/O 0 | Command/address/data input pin; becomes bidirectional I/O0 during dual/quad I/O reads |
| SO (I/O1) | Serial Output / Quad I/O 1 | Data output pin; functions as I/O1 in dual/quad I/O modes for parallel bit streaming |
| WP (I/O2) | Write Protect / Quad I/O 2 | Configurable pin: hardware write-protection when QE=0, or I/O2 in quad-SPI mode when QE=1 |
| HOLD (I/O3) | Hold / Quad I/O 3 | Pauses ongoing SPI transfer without resetting state; repurposed as I/O3 when quad-SPI enabled |
| VCC | Power Supply | Primary 2.7–3.6 V supply; requires local decoupling per datasheet layout guidelines |
| GND | Ground Reference | System ground return path; must be low-impedance and co-located with VCC decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Quad-I/O Fast Read (1-4-4) | Enables 4-bit-per-clock read throughput, doubling bandwidth vs. standard SPI for XiP latency reduction |
| Continuous Read with Wrap | Eliminates repeated command opcodes during sequential access, improving effective read speed by ~15% |
| Erase/Program Suspend & Resume | Allows interrupting background erase/program to service urgent read requests-critical for real-time systems |
| 3 × 256-byte OTP Security Registers | Stores immutable keys or calibration data; prevents overwrite after programming, enhancing firmware integrity |
| SFDP Register Support | Provides standardized, host-readable parameter table for automatic configuration of timing, voltage, and command sets |
Applications
| Industrial PLC Firmware Storage | IoT Edge Device Boot Memory |
|---|---|
Use Scenario: Storing and executing ladder logic firmware in programmable logic controllers with periodic field updates. IC Role / Device Role / Timing Role: Primary non-volatile boot memory enabling execute-in-place (XiP) operation directly from flash. Use Value: 133 MHz quad-I/O read and 4 kB block erase allow sub-second firmware patching without full reflash downtime. | Use Scenario: Hosting secure bootloader and application firmware in battery-powered smart sensors deployed in remote locations. IC Role / Device Role / Timing Role: Trusted firmware storage with OTP registers for device identity and encrypted key storage. Use Value: 1 µA deep power-down current extends battery life; SFDP enables automatic host compatibility across firmware revisions. |
| Medical Diagnostic Instrument Code Storage | Automotive Infotainment System Configuration |
Use Scenario: Storing FDA-cleared diagnostic algorithms and calibration tables in portable ultrasound units requiring data integrity verification. IC Role / Device Role / Timing Role: High-reliability firmware and parameter storage with 20-year data retention and 100,000-cycle endurance. Use Value: Dual-I/O fast read (1-2-2) ensures deterministic boot timing; write protection via WP pin prevents accidental corruption during service. | Use Scenario: Holding infotainment OS kernel, UI assets, and user preference profiles in automotive head units with AEC-Q100 alignment. IC Role / Device Role / Timing Role: Secondary SPI flash for modular software partitioning-separating OS, apps, and settings from main SoC eMMC. Use Value: 32 kB block erase granularity enables independent update of UI assets without affecting core OS binaries. |
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, 133 MHz max, same SOIC-8 package; lacks 0-4-4 continuous read mode and OTP security registers | Supports standard quad-SPI but no XiP-optimized continuous read; lower security assurance for firmware signing keys | Preferred where cost sensitivity outweighs XiP latency and security register requirements |
| Micron MT25QL32ABA8E12-0SIT | 32 Mbit, 133 MHz, DFN-8 package only; includes SFDP v1.6 and enhanced security lock bits but no HOLD pin function | Requires PCB redesign for DFN; better for high-density layouts but removes hardware pause capability | Selected when board space is constrained and HOLD functionality is not required in the host design |
Compared with W25Q32JVSSIQ and MT25QL32ABA8E12-0SIT, the AT25SF321B-SHB-T uniquely combines 0-4-4 continuous read for lowest XiP latency, dedicated OTP registers for immutable key storage, and pin-compatible HOLD functionality-making it optimal for real-time, security-aware embedded boot systems.
Availability
AT25SF321B-SHB-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, IoT edge device boot memory, medical diagnostic instrument code storage, automotive infotainment system configuration, and secure bootloader implementations requiring stable component supply across multi-year production cycles.
Supply support for AT25SF321B-SHB-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 AT25SF321B belongs to Renesas' AT25SF family of SPI flash memories engineered specifically for high-reliability, low-power, and XiP-capable embedded boot applications demanding fast read performance and robust firmware protection.
FAQ
What is the maximum SPI clock frequency supported by the AT25SF321B-SHB-T?
The AT25SF321B-SHB-T supports a maximum SPI clock frequency of 133 MHz across all read modes-including standard, dual-output, dual-I/O, quad-output, and quad-I/O. This specification is guaranteed under DC and AC operating conditions (2.7–3.6 V, -40°C to +85°C) and enables high-bandwidth execute-in-place (XiP) operation. The AT25SF321B-SHB-T achieves this using optimized internal timing and quad-SPI bus architecture.
Does the AT25SF321B-SHB-T support execute-in-place (XiP) operation?
Yes, the AT25SF321B-SHB-T is explicitly designed to support execute-in-place (XiP) operation. Key enablers include quad-SPI (1-4-4) and continuous read (0-4-4) modes that eliminate opcode overhead and deliver sustained high-speed instruction fetch. The AT25SF321B-SHB-T datasheet confirms XiP suitability in its Product Overview section, citing fast read response and optimized memory access patterns.
How many one-time programmable (OTP) security registers does the AT25SF321B-SHB-T include?
The AT25SF321B-SHB-T includes three 256-byte one-time programmable (OTP) security registers, accessible via dedicated commands (42h program, 48h read, 44h erase). Once programmed, these registers cannot be altered, making them suitable for storing cryptographic keys, device identifiers, or calibration data. The AT25SF321B-SHB-T implements hardware-level write locking to enforce OTP behavior.
What package type is used for the AT25SF321B-SHB-T?
The AT25SF321B-SHB-T uses an 8-lead, 208-mil wide SOIC (Small Outline Integrated Circuit) package, compliant with industry-standard JEDEC MS-012AC dimensions. This package is RoHS-compliant, halogen-free, and rated for operation from -40°C to +85°C. The AT25SF321B-SHB-T pinout matches standard SPI flash footprints, enabling drop-in compatibility with existing SOIC-8 layouts.
Does the AT25SF321B-SHB-T support Serial Flash Discoverable Parameters (SFDP)?
Yes, the AT25SF321B-SHB-T fully supports Serial Flash Discoverable Parameters (SFDP) via the 5Ah command, providing a standardized, host-readable register map for automatic configuration of timing parameters, voltage ranges, command sets, and feature flags. This capability simplifies firmware development and ensures interoperability across different host controllers. The AT25SF321B-SHB-T implements SFDP v1.5 as specified in the datasheet.
AT25SF321B-SHB-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- 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-SOIC
AT25SF321B-SHB-T FAQ
1.How can I place an order for AT25SF321B-SHB-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25SF321B-SHB-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-SHB-T reliable?
The price and inventory of AT25SF321B-SHB-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-SHB-T is usually 5 days.
3.What payment methods are accepted for AT25SF321B-SHB-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25SF321B-SHB-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25SF321B-SHB-T?
AT25SF321B-SHB-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25SF321B-SHB-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-SHB-T?
For technical support, including AT25SF321B-SHB-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25SF321B-SHB-T requirements.
6.How does Aetrix verify that AT25SF321B-SHB-T is sourced from the original manufacturer or authorized distributors?
All AT25SF321B-SHB-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-SHB-T meets industry standards.
7.What is the process for return or replacement of AT25SF321B-SHB-T?
All AT25SF321B-SHB-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25SF321B-SHB-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-SHB-T part is unused and in its original packaging.
Return procedure for AT25SF321B-SHB-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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