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Renesas AT25XE321D-SHN-B
- Part No.:
- AT25XE321D-SHN-B
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25XE321D-SHN-B.pdf
- Description:
- IC FLASH 32MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,549
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Product details
Overview
AT25XE321D-SHN-B from Renesas Electronics is a 32-Mbit SPI serial Flash memory IC supporting 1.65 V–3.6 V operation, quad I/O (1-4-4/XiP) and dual/quad output modes, with 133 MHz max clock frequency and 256-byte page erase capability. It serves as non-volatile program storage or eXecute-in-Place (XiP) code memory in resource-constrained embedded systems.
For engineers reviewing the AT25XE321D-SHN-B datasheet, AT25XE321D-SHN-B pinout, AT25XE321D-SHN-B application, or AT25XE321D-SHN-B equivalent, key selection considerations include its ultra-low-power Deep Power-Down (7 µA) and Ultra Deep Power-Down (5 nA) currents, Read-Modify-Write command for SRAM-like writes, active status interrupt, and JEDEC-standard SFDP support for automatic configuration.
Technical Context
The AT25XE321D-SHN-B implements a flexible SPI interface with hardware-compatible support for modes 0 and 3, plus extended transfer protocols including 1-1-2, 1-1-4, 1-4-4, and 0-4-4 (XiP). Its internal architecture integrates a 32-Mbit Flash array, 256-byte SRAM buffer, and I/O Interface Unit that dynamically adapts signal routing per selected mode.
Memory management includes five erase granularities (256 B page, 4/32/64 kB blocks, full chip), nested erase/program suspend/resume, and configurable protection via individual block lock, global lock, and user-definable protected regions. Status registers are non-volatile and volatile-capable, with indirect addressing and lock mechanisms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (4 MB) - supports firmware images, boot code, and configuration data for mid-tier microcontrollers. |
| Supply Voltage Range | 1.65 V to 3.6 V - enables direct integration into single-supply battery-powered systems without level-shifting. |
| Max Clock Frequency | 133 MHz - delivers up to 532 MB/s effective read throughput in quad I/O (1-4-4) mode. |
| Erase Granularity | 256-byte page erase - allows efficient overwriting of small runtime data (e.g., sensor logs, calibration values) without disturbing adjacent sectors. |
| Power Consumption | 5–7 nA Ultra Deep Power-Down current - extends battery life in always-on IoT edge nodes during extended sleep intervals. |
| Endurance & Retention | 100,000 program/erase cycles and 20-year data retention - suitable for field-deployed industrial controllers requiring long-term reliability. |
| Operating Temperature | −40 °C to +85 °C - qualified for automotive cabin, industrial PLC, and outdoor connected device environments. |
Pinout & Package
AT25XE321D-SHN-B is packaged in an 8-lead SOIC (208-mil wide body), RoHS-compliant, green package with standard JEDEC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS# | Chip Select | Active-low enable for SPI command initiation; must be asserted before SCK edge to start valid transaction. |
| SCK | Serial Clock | Master-generated clock synchronizing all SPI transfers; supports up to 133 MHz in quad I/O mode. |
| SI / IO0 | Serial Input / I/O0 | Primary data input in standard SPI; functions as bidirectional I/O0 in dual/quad modes. |
| SO / IO1 | Serial Output / I/O1 | Primary data output in standard SPI; functions as bidirectional I/O1 in dual/quad modes. |
| WP# / IO2 | Write Protect / I/O2 | Hardware write protection when low; repurposed as I/O2 in quad I/O operations. |
| HOLD# / RESET# / IO3 | Hold / Hardware Reset / I/O3 | Pauses ongoing SPI transfer when held low; double-function reset pin compliant with JEDEC standard; acts as I/O3 in quad I/O. |
Key Features
| Feature | Design Value |
|---|---|
| Read-Modify-Write (RMW) Command (0Ah) | Emulates byte-level SRAM write in a single SPI command - eliminates need for read-erase-program sequence for small updates. |
| Active Status Interrupt (25h) | Generates host interrupt upon RDY/BSY bit clear - enables event-driven polling reduction and deterministic timing for real-time firmware updates. |
| Quad I/O and XiP Support (1-4-4 / 0-4-4) | Enables continuous high-speed code execution directly from Flash - reduces external RAM dependency and system BOM cost. |
| Three 128-byte OTP Security Registers | Provides immutable storage for keys, certificates, or device-specific identifiers - supports secure boot and anti-cloning requirements. |
| Flexible Block Protection | Supports individual block lock, global lock, and user-defined protected regions at memory start/end - prevents accidental firmware overwrite during field updates. |
Applications
| Firmware Storage for MCU Boot | eXecute-in-Place (XiP) Code Execution |
|---|---|
Use Scenario: Storing bootloader and application firmware for ARM Cortex-M or RISC-V microcontrollers in space-constrained consumer electronics. IC Role / Device Role / Timing Role: Non-volatile program memory accessed during cold boot and firmware update cycles; supports fast sequential reads via quad output mode. Use Value: 256-byte page erase enables efficient patching of firmware binaries without full reflash; 1.65 V minimum voltage ensures compatibility with Li-ion battery discharge curves. |
Use Scenario: Running real-time control code directly from Flash on low-cost microcontrollers lacking sufficient on-chip flash. IC Role / Device Role / Timing Role: Execute-in-Place memory with continuous read (0-4-4) eliminating opcode overhead; leverages 133 MHz clock for sub-µs instruction fetch latency. Use Value: Eliminates need for external RAM copy step - reduces power consumption and PCB area; supported by RMW command for runtime parameter updates. |
| Data Logging in Battery-Powered Sensors | Secure Configuration Storage for Industrial Gateways |
Use Scenario: Recording timestamped sensor readings (temperature, humidity, motion) in wireless environmental monitors operating for years on coin-cell batteries. IC Role / Device Role / Timing Role: Low-power non-volatile data store with ultra-deep power-down (5 nA) and page-erase granularity for appending new entries. Use Value: 7 µA deep power-down current extends multi-year battery life; 256-byte pages minimize write amplification during frequent small-data updates. |
Use Scenario: Storing encrypted network credentials, TLS certificates, and device identity keys in industrial Ethernet gateways requiring tamper resistance. IC Role / Device Role / Timing Role: Secure configuration vault using three 128-byte OTP registers and individual block lock for critical firmware sections. Use Value: OTP registers prevent post-deployment modification; block protection prevents unauthorized firmware rollback or malicious overwrite during OTA updates. |
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 W25Q32JVS | 32-Mbit, 1.7–2.0 V supply range only; no Ultra Deep Power-Down (UDPD); lacks RMW command and OTP security registers. | Lower power consumption not required; security features not mandated; simpler firmware update flow. | Preferred where cost sensitivity outweighs ultra-low-power or secure boot needs. |
| Macronix MX25L3233F | 32-Mbit, 2.7–3.6 V supply; supports 133 MHz quad I/O but no XiP continuous read (0-4-4); no active status interrupt or UDPD mode. | Higher-voltage systems (e.g., 3.3 V industrial bus); no requirement for event-driven status signaling or sub-µA sleep states. | Selected when legacy 3.3 V design compatibility and proven qualification history are prioritized over advanced low-power features. |
Compared with Winbond W25Q32JVS and Macronix MX25L3233F, the AT25XE321D-SHN-B uniquely combines ultra-wide 1.65–3.6 V operation, 5 nA UDPD current, hardware-accelerated RMW, and OTP-based security - making it optimal for next-generation battery-powered and secure-edge devices where voltage flexibility and power efficiency are non-negotiable.
Availability
AT25XE321D-SHN-B is available at Aetrix Electronics and suitable for firmware storage, eXecute-in-Place (XiP) code execution, and secure configuration storage requiring stable component supply across production lifecycles.
Supply support for AT25XE321D-SHN-B 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 applications.
The AT25XE321D belongs to Renesas' high-efficiency serial Flash memory product line, engineered specifically for ultra-low-power, secure, and flexible code/data storage in battery-operated and safety-critical embedded systems.
FAQ
What is the maximum SPI clock frequency supported by the AT25XE321D-SHN-B?
The AT25XE321D-SHN-B supports a maximum SPI clock frequency of 133 MHz in quad I/O (1-4-4) mode. This enables high-throughput data access for XiP and firmware loading. The actual achievable frequency depends on signal integrity, PCB layout, and VCC level - with guaranteed AC timing compliance across the full 1.65 V–3.6 V supply range as specified in Section 7.4 of the AT25XE321D-SHN-B datasheet.
Does the AT25XE321D-SHN-B support true eXecute-in-Place (XiP) operation?
Yes, the AT25XE321D-SHN-B supports true XiP via its 0-4-4 command format, which eliminates opcode transmission overhead after initial setup and enables continuous burst reads. This feature is validated in Section 4.6 of the AT25XE321D-SHN-B datasheet and requires host controller support for wrap-mode addressing and proper timing alignment.
How does the Read-Modify-Write (RMW) command in the AT25XE321D-SHN-B improve firmware update efficiency?
The RMW command (0Ah) in the AT25XE321D-SHN-B performs atomic byte-level updates without requiring separate read-erase-program sequences. This reduces update time by up to 70% for small parameter changes and eliminates risk of data corruption during power loss - a key advantage over conventional SPI Flash devices that lack this hardware-accelerated function.
What power-saving modes are available on the AT25XE321D-SHN-B, and what are their typical current draws?
The AT25XE321D-SHN-B offers three low-power states: standby (26 µA typical), Deep Power-Down (7 µA typical), and Ultra Deep Power-Down (5–7 nA typical). These modes are entered via dedicated commands (B9h and 79h) and exited with ABh, enabling aggressive energy budgeting in battery-powered applications such as wireless sensors and wearables.
Can the AT25XE321D-SHN-B be used in systems requiring secure boot or device authentication?
Yes, the AT25XE321D-SHN-B includes three 128-byte One-Time Programmable (OTP) security registers and individual block lock functionality. These features allow permanent storage of cryptographic keys, device IDs, or secure boot manifests - and prevent unauthorized modification of critical firmware sections, fulfilling foundational requirements for secure boot chains in industrial and medical devices.
AT25XE321D-SHN-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- -
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH - NOR (SLC)
- Memory Size:
- 32Mbit
- Memory Organization:
- 4M x 8
- Memory Interface:
- SPI - Quad I/O
- Clock Frequency:
- 133 MHz
- Write Cycle Time - Word, Page:
- 32µs, 8ms
- Access Time:
- 8 ns
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25XE321D-SHN-B FAQ
1.How can I place an order for AT25XE321D-SHN-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25XE321D-SHN-B 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 AT25XE321D-SHN-B reliable?
The price and inventory of AT25XE321D-SHN-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25XE321D-SHN-B is usually 5 days.
3.What payment methods are accepted for AT25XE321D-SHN-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25XE321D-SHN-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25XE321D-SHN-B?
AT25XE321D-SHN-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25XE321D-SHN-B 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 AT25XE321D-SHN-B?
For technical support, including AT25XE321D-SHN-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25XE321D-SHN-B requirements.
6.How does Aetrix verify that AT25XE321D-SHN-B is sourced from the original manufacturer or authorized distributors?
All AT25XE321D-SHN-B 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 AT25XE321D-SHN-B meets industry standards.
7.What is the process for return or replacement of AT25XE321D-SHN-B?
All AT25XE321D-SHN-B units undergo pre-shipment inspection (PSI). If there is an issue with AT25XE321D-SHN-B, 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 AT25XE321D-SHN-B part is unused and in its original packaging.
Return procedure for AT25XE321D-SHN-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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